Pierre Kervella – Curriculum Vitae


Observatoire de Paris, LESIA, 5 place Jules Janssen, F-92195 Meudon, +33 145077966

Professional email:          pierre – dot - kervella – at – obspm – dot - fr

http://lesia.obspm.fr/perso/pierre-kervella/

 

Education and professional experience:

2012 : Astronome (Full Professor), Observatoire de Paris (LESIA)

2007: Habilitation thesis, Paris 7 University, 11/07/2007, "Application of interferometry to the study of Cepheids and dwarf stars", Manuscript (in french):  http://tel.archives-ouvertes.fr/tel-00258916/en/

2004-2012: Astronome-Adjoint (Associate Professor), Observatoire de Paris (LESIA)

2002-2004: Staff Astronomer and Fellow at ESO, Santiago and Cerro Paranal (Chile).

Responsible, first as PhD student then as fellow of the construction and operation of the successful VINCI instrument of the VLTI. Lead author of the data reduction software of this instrument. Observing experience of ~300 nights at Paranal (VLTI commissioning and scientific observations), and more than 150 nights at other interferometric facilities (CHARA, PTI, IOTA).

1998-2001: PhD in Astrophysics, ESO Garching and Paris 7 University, 14/11/2001:

"Optical interferometry with the VLT – Application to the study of Cepheids", with High Honors, Manuscript (in french):  http://tel.archives-ouvertes.fr/tel-00258928/en/

1996-1997: Master in Astrophysics and Space Science, Paris 7 University, High Honors

1995-1996: Master in Mechanical Structure Engineering, Paris 6 University, with Honors

1993-1996: Engineer in Electro-Mechanics, ESTP (Paris), head of the list.

 

Astrophysics research topics: Interferometric instrumentation and observational stellar physics

Š       Instrumentation for optical/infrared long-baseline interferometry:

2007-present: responsible of the scientific data reduction software of GRAVITY, one of the second generation VLTI instruments, aimed at ultra-high accuracy astrometry of the Galactic Center.

1998-2004: reponsible at ESO of the successful VINCI commissioning instrument of the VLTI.

Š       Cepheids: innovative application of diffferent observing techniques to Cepheids: interferometry (VLTI), high resolution spectroscopy (HARPS), imaging,... Discovery in 2005 of the circumstellar envelopes of Cepheids. Study of the light echoes of RS Pup. Ongoing observing programs with the VLT, HST and Herschel.

Š       Fast-rotating stars: discovery of the spectacular flattening of the nearby Be star Achernar and of its asymetric circumstellar envelope. Discovery of the A0V companion of Achernar in 2007 (using VISIR and NACO).

Š       Evolved stars: discovery of the compact gaseous asymetric envelope of Betelgeuse in 2009 using lucky imaging with NACO, discovery of its extended dusty envelope in 2011 using VISIR.

Š       Structure and evolution of solar type stars: modeling of nearby dwarf stars using a combination of constraints from interferometry, photometry, asteroseismology, and spectroscopy (applied e.g. to a Cen, 61 Cyg,…).

 

Supervision of PhD students and post-doctoral researchers:

2012-2015: Joanne Breitfelder (PhD), interferometric calibration of the Cepheid distance scale (with A. Mérand)

2011-2014: Miguel MontargŹs (PhD), mass loss of the red supergiant star Betelgeuse (with G. Perrin)

2011: Peter Schuller (post-doctoral researcher), atmospheric properties of Paranal for interferometry

2008-2011: Alexandre Gallenne (PhD), characterization of Cepheid envelopes (with A. Mérand)

 

Teaching activities: ~100-150 h/yr

“Fourier optics and coherence”, Master 1, Paris Observatory (18 h/yr)

“High angular resolution in Astronomy”, Master 2 Research, Paris Observatory (8 h/yr)

“Instrumentation in Astronomy”, LuMMEx Master 2 Research, Paris 6 University (9 h/yr)

“Proposals for large telescopes”, Post-Master course, Paris Observatory (15 h/yr)

 “Stars and the Interstellar Medium”, University Degree, Paris Observatory (13h/yr)

 “Astronomy and Celestial Mechanics”, Remote teaching, Paris Observatory (~30 h/yr)

Pedagogical projets with school teachers (~10h/yr)

Supervision of the Master’s thesis of ~two Master 1 or Master 2 students per year

 

Scientific and administrative responsibilities:

- 2011-2012 and 2005-2007: expert adviser for the ESO OPC in panel D (stars), for six periods.

- 2007-2013: expert adviser for the European Research Council (Marie Curie mobility programs)

- 2009-2013: elected member of the “Unité Formation et Enseignement” council at Paris Observatory

- 2010-2014: elected member of the LESIA laboratory council

- 2010-2014: member of the scientific council of the french National Program in Stellar Physics (PNPS)

- 2008-2012: co-responsible of the FP7/OPTICON programme “Enhancing the scientific output of Interferometry” with Denis Mourard and Franćoise Delplancke.

- 2007-2011: elected member of the french Conseil National des Astronomes et Physiciens (CNAP), the committee in charge of the recruitement and career management of french astronomers.

- 2007-2011: member of the scientific council of the Jean-Marie Mariotti Center (JMMC)

- referee for A&A, ApJ, Science, Nature, MNRAS, PASP,...

 

Prizes: Prix Jeune Chercheur of the Société Franćaise d’Astronomie et d’Astrophysique (SF2A) in 2009.

 

Publications in refereed journals:

74 refereed articles (+3 submitted), 26 as first author, and 16 in second position, ~2200 citations, h-index=31

 

74) Mean angular diameters, distances, and pulsation modes of the classical Cepheids FF Aql and T Vul - CHARA/FLUOR near-IR interferometric observations,

Gallenne A., Kervella P., Mérand A., et al., A&A, 541, A87 (2012)

73) The long-period Galactic Cepheid RS Pup - II. 3D structure and mass of the nebula from FORS polarimetry,

Kervella P., Mérand A., et al., A&A, 541, A18 (2012)

72) Flares and variability from Sgr A* : five nights of simultaneous multi-wavelength observations

Haubois X., … Kervella P., et al., A&A, 540, A41 (2012)

71) Three-dimensional interferometric, spectrometric, and planetary views of Procyon

Chiavassa A., Bigot L., Kervella P., et al., A&A, 540, A5 (2012)

70) EChO - Exoplanet Characterisation Observatory

Tinetti G., Beaulieu J.-P.,…, Kervella P., et al., Experimental Astronomy, in press (2012), arXiv:1112.2728

69) Thermal infrared properties of classical and type II Cepheids - 10 Ķm imaging with VISIR

Gallenne A., Kervella P., Mérand A., A&A, 538, A24 (2012)

68) The Baade-Wesselink p-factor applicable to LMC Cepheids

Nardetto N., Fokin A., … Kervella P., A&A 534, L16 (2011)

67) Hot exozodiacal dust resolved around Vega with IOTA/IONIC

DefrŹre D., Absil O., … Kervella P., et al., A&A 534, 5 (2011)

66) The diameter of the CoRoT target HD 49933. Combining the 3D limb darkening, asteroseismology, and interferometry,

Bigot L., … Kervella P., et al., A&A 534, L3 (2011)

65) The nearby eclipsing stellar system δ Velorum. III. Self-consistent fundamental parameters and distance

Mérand A., Kervella P., et al., A&A 532, 50 (2011)

64) The close circumstellar environment of Betelgeuse. II. Diffraction-limited spectro-imaging from 7.76 to 19.50 μm with VLT/VISIR,

Kervella P., Perrin G., Chiavassa A., et al., A&A 531, 117 (2011)

63) The nearby eclipsing stellar system δ Velorum. II. First reliable orbit for the eclipsing pair

Pribulla T., Mérand A., Kervella P., et al., A&A 528, 21 (2011)

62) Spatially extended emission around the Cepheid RS Puppis in near-infrared hydrogen lines

Gallenne, A., Mérand, A., Kervella P., & Girard, J. H. V., A&A 527, 51 (2011)

61) Surface convection and red-giant radius measurements

Piau L., Kervella P., Dib S., Hauschildt P., A&A 526, 100 (2011)

60) Interferometric radius and limb darkening of the asteroseismic red giant η Ser with the CHARA Array

Mérand A., Kervella P., et al., A&A 517, 64 (2010)

59) The radius and effective temperature of the binary Ap star b CrB from FLUOR and NACO observations

Bruntt H., Kervella P., et al., A&A 512, 55 (2010)

58) VEGA: Visible spEctroGraph and polArimeter for the CHARA array

Mourard D.,…, Kervella P., et al. A&A 508, 1073 (2009)

57) A binary engine fuelling HD 87643's complex circumstellar environment

Millour F.,…, Kervella P., et al. A&A 507, 317 (2009)

56) An Interferometric Study of the Fomalhaut Inner Debris Disk. I. Near-IR detection of hot dust with VINCI

Absil O.,…, Kervella P., et al. ApJ 704, 150 (2009)

55) Mass-radius relation of low and very-low mass stars revisited with the VLTI

Demory B.-O., Ségransan D.,…, Kervella P., et al. A&A 505, 205 (2009)

54) The close circumstellar environment of Betelgeuse. Adaptive optics spectro-imaging with VLT/NACO

Kervella P., Verhoelst T., Ridgway S. T., et al. A&A 504, 115 (2009)

53) High resolution spectroscopy for Cepheid distance determination - V. p-factor for the cross correlation method

Nardetto N., Gieren W., Kervella P., Fouqué P., Storm J., Mourard, D., & Queloz D. A&A 502, 951 (2009)

52) The circumstellar envelopes of the Cepheids L Car & RS Pup - Comparative study with Spitzer, VISIR, MIDI

Kervella P., Mérand A., Gallenne A. A&A 498, 425 (2009)

51) The environment of the fast rotating star Achernar - Mid-infrared interferometry with VLTI/MIDI

Kervella P., Domiciano de Souza A., Kanaan S., Spang A., Stee Ph. A&A 493, L53 (2009)

50) The nearby eclipsing stellar system d Velorum. I. Origin of the IR excess from VISIR and NACO imaging

Kervella P., Thévenin F., Petr-Gotzens M. A&A 493, 107 (2009)

49) The angular sizes of dwarf stars and subgiants. Non-linear surface brightness relations in BVRcIc

Kervella P., Fouqué P. A&A 491, 855 (2008)

48) Interferometric observations of the nearby K dwarfs 61 Cyg A&B - Diameter measurements and modeling

Kervella P., Mérand A., Thévenin F., Heiter U., et al. A&A 488, 667 (2008)

47) A near-infrared interferometric survey of debris disc stars - II. CHARA/FLUOR observations of six dwarfs

Absil O., Di Folco E., Mérand A., ..., Kervella P., et al. A&A 487, 1041 (2008)

46) A low-mass planet with a possible sub-stellar-mass host in microlensing event MOA-2007-BLG-192

Bennett D. P., Bond I. A., Udalski A.,..., Kervella P., et al. ApJ 684, 663 (2008)

45) The close-in companion of the fast rotating Be star Achernar

Kervella P., Domiciano de Souza A., & Bendjoya, Ph. A&A, 484, L13 (2008)

44) High-resolution thermal infrared imaging of MWC300 - VLT/VISIR observations in BURST mode.

Domiciano de Souza A., Kervella P., Bendjoya Ph., & Niccolini G. A&A 480, L29 (2008)

43) The long-period Galactic Cepheid RS Puppis - I. A geometric distance from its light echoes.

Kervella P., Mérand A., Szabados L., Fouqué P., et al. A&A 480, 167 (2008)

42) A new calibration of Galactic Cepheid period-luminosity relations from B to K bands, and a comparison to LMC relations.

Fouqué P., Arriagada P., Storm J.,…,  Kervella P., et al. A&A 476, 73  (2007)

41) A near-infrared interferometric survey of debris disk stars - I. Probing the hot dust content around e Eridani and t Ceti with CHARA/FLUOR.

Di Folco E., Absil O.,…, Kervella P., et al. A&A 475, 243  (2007)

40) The environment of the fast rotating star Achernar. High-resolution thermal IR imaging with VISIR

Kervella P., & Domiciano de Souza A. A&A 474, L49  (2007)

39) Asteroseismology and interferometry

Cunha M. S., Aerts C., Christensen-Dalsgaard J.,…, Kervella P. et al.. A&A Review, 14, 217  (2007)

38) Interferometric observations of the multiple stellar system d Velorum

Kellerer A., Petr-Gotzens M. P., Kervella P., Coudé du Foresto V. A&A 469, 633 (2007)

37) Extended envelopes around Cepheids III. Y Oph & a Per from near-IR interferometry with CHARA/FLUOR

Mérand A., Aufdenberg J., Kervella P., Coudé du Foresto V., et al. ApJ 664, 1093 (2007)

36) Interferometric observations of h Carinae with VINCI/VLTI

Kervella P. A&A 464, 1045 (2007)

35) Deep imaging survey of the environment of a Cen - II. CCD imaging with the NTT-SUSI2 camera

Kervella P. & Thévenin F. A&A 464, 373 (2007)

34) Multiple shock waves in the atmosphere of the Cepheid X Sgr ?

Mathias P., Gillet D., Fokin A. B., Nardetto N., Kervella P. & Mourard D. A&A 457, 575 (2006)

33) Deep imaging survey of the environment of a Cen - I. Adaptive optics imaging of a Cen B with VLT-NACO

Kervella P., Thévenin F., Coudé du Foresto V. & Mignard F. A&A 459, 669 (2006)

32) The polar wind of the fast rotating Be star Achernar – VINCI/VLTI observations of an elongated envelope

Kervella P. & Domiciano de Souza A. A&A 453, 1059 (2006)

31) Long-baseline interferometric measurements of Vega consistent with a pole-on, rapidly rotating star

Aufdenberg J., Mérand A., Coudé V., Absil O., Di Folco E., Kervella P., et al. ApJ 645, 664 (2006) Err. ApJ 651, 617

30) High resolution spectroscopy for Cepheids distance determination. I. Line asymmetry

Nardetto N., Mourard D., Kervella P., Mathias Ph., Mérand A., & Bersier D. A&A 453, 309 (2006)

29) Extended envelopes around Cepheids II. Polaris and d Cep from near-IR interferometry with CHARA/FLUOR, Mérand A., Kervella P., Coudé du Foresto V., et al. A&A 453, 155 (2006)

28) Circumstellar material in the inner Vega system revealed by CHARA/FLUOR

Absil O., Di Folco E., Mérand A., Coudé V., Augereau J.-C., Aufdenberg J., Kervella P., et al. A&A 452, 237 (2006)

27) Extended envelopes around Cepheids I. L Car from near and mid-infrared interferometry with the VLTI

Kervella P., Mérand A., Perrin G., Coudé du Foresto V. A&A 448, 623 (2006)

26) The limb darkening of a Cen B: Matching 3D hydrodynamical models  with interferometric measurements

Bigot L., Kervella P., Thévenin F., Ségransan D. A&A 446, 635 (2006)

25) Gravitational-darkening of Altair from interferometry

Domiciano de Souza A., Kervella P., Jankov S., et al. A&A 442, 567 (2005)

24) The projection factor of d Cephei - A calibration of the Baade-Wesselink method using the CHARA Array

Mérand A., Kervella P., Coudé du Foresto V., et al. A&A 438, L9 (2005)

23) On the limb darkening, spectral energy distribution and temperature structure of Procyon

Aufdenberg J., Ludwig H. G., Kervella P. ApJ 633, 424 (2005)

22) VINCI/VLTI diameter contraints on the evolutionary status of d Eri, x Hya and h Boo

Thevenin F., Kervella P., Pichon B., et al. A&A 436, 253 (2005)

21) VLTI near-infrared observations of the stellar multiple system d Velorum

Petr-Gotzens M. G., Kellerer A., Kervella P., Coudé du Foresto V., Astron. Nachrichten 326, 569 (2005)

20) The angular size of dwarf stars and subgiants – Surface brightness relations calibrated by interferometry

Kervella P., Thévenin F.,  Ségransan D., Di Folco E. A&A 426, 297 (2004)

19) Cepheid distances from long-baseline interferometry. III. Surface Brightness relations

Kervella P., Bersier D., Nardetto N., Mourard D., Fouqué P., Coudé du Foresto V. A&A 428, 587 (2004)

18) Cepheid distances from long-baseline interferometry. II. Period-Radius and Period-Luminosity relations

Kervella P., Bersier D., Nardetto N., Mourard D., Coudé du Foresto V. A&A 423, 327 (2004)

17) Cepheid distances from long-baseline interferometry. I. VINCI/VLTI observations of seven Galactic Cepheids

Kervella P., Nardetto N., Bersier D., Mourard D., Coudé du Foresto V. A&A 416, 941 (2004)

16) First observations with an H-band integrated optics beam combiner at the VLTI

Le Bouquin J.-B., Rousselet-Perrault K., Kern P., Malbet F., Haguenauer P., Kervella P., et al. A&A 424, 719 (2004)

15) Self consistent modelling of the projection factor for interferometric distance determination

Nardetto N., Fokin A., Mourard D., Mathias Ph., Kervella P., Bersier D. A&A 428, 131 (2004)

14) VLTI observations of Vega-like stars. Radius and age of a PsA, b Leo, b Pic, e Eri and t Cet

Di Folco E., Thevenin F., Kervella P., Domiciano A., Coudé du Foresto V., et al. A&A 426, 601 (2004)

13) From interferometric fringes to calibrated visibilities - Data analysis methods for the VINCI/VLTI instrument

Kervella P., Ségransan D., Coudé du Foresto V. A&A 425, 1161 (2004)

12) VLTI/VINCI observations of the nucleus of NGC 1068 using the adaptive optics system MACAO

Wittkowski M., Kervella P., Arsenault R., Paresce F., Beckert T., Weigelt G. A&A 418, L39 (2004)

11) The angular size of L Carinae: Comparison of the interferometric and surface brightness techniques

Kervella P., Fouqué P., Storm J., Gieren W.P., Bersier D., Mourard D., et al. ApJ 604, 113 (2004)

10) The diameter and evolutionary state of Procyon A

Kervella P., Thévenin F., Morel P., Provost J., Bordé P., Berthomieu G. A&A 413, 251 (2004)

9) Test of stellar model atmospheres by interferometry - The limb darkening of the M4 giant y Phe

Wittkowski M., Aufdenberg J. P., Kervella P. A&A 413, 711 (2004)

8) Direct measurement of the size and shape of the star h Carinae

Van Boekel R., Kervella P., Schöller M., Herbst T., Brandner W., de Koters A., et al. A&A 410, L37 (2003)

7) The interferometric diameter and internal structure of Sirius

Kervella P., Thévenin F., Morel P., Bordé P., Di Folco E. A&A 408, 681 (2003)

6) The spinning-top star Achernar from VLTI-VINCI interferometry

Domiciano de Souza A., Kervella P., Jankov S., Abe L., Vakili F., Di Folco E., Paresce F. A&A 407, L47 (2003)

5) The diameters of a Centauri A and B: a comparison of the asteroseismic and VLT Interferometer views

Kervella P., Thévenin F., Ségransan S., et al. A&A 404, 1087 (2003), illustration de couverture de A&A

4) First radius measurements of very low mass stars with the VLTI

Ségransan S., Kervella P., Forveille T., Queloz D. A&A 397, L5 (2003)

3) Calibration of the Barnes-Evans relation using interferometric observations of Cepheids

Nordgren T.E., Lane B.F., Hindsley R.B., Kervella P. AJ 123, 3380 (2002)

2) Interferometric evidence for very extended gaseous layers around O-rich Miras and M giants

Mennesson B., Perrin G.,..., Kervella P., Traub W., Lacasse M. ApJ 579, 446 (2002)

1) The angular diameter and distance of the Cepheid z Gem

Kervella P., Coudé du Foresto V., Perrin G., Schöller M., Traub W. A., Lacasse M. G. A&A 367, 876 (2001)

 

Invited presentations at international conferences and advanced schools:

6) Stellar radii from long-baseline interferometry: strong constraints in the Kepler era (invited presentation)

Kervella P., Los Alamos Stellar Hydrodynamics Workshop, Santa Fe, NM, USA, 2-4 Avril 2012

5) Fundamental stellar parameter constraints from interferometry (invited presentation)

Kervella P., Conf. “Ten Years of VLTI”, 24-27 Oct. 2011, http://www.eso.org/VLTI_2011/

4) A brief history of optical interferometry (invited review at an international advanced school)

Kervella P., European Erasmus Intensive Program, Porquerolles, 17-28 Avril 2010

http://www.european-interferometry.eu/training/2010

3) Hot stars and interferometry: Achernar and η Carinae (invited presentation)

Kervella P., Conf. “The interferometric view on hot stars”, 2-6 March 2009, ViĖa, Chile

2) Interferometric angular diameters, linear radii and stellar modeling (invited presentation)

Kervella P., Conf. “14th Cool Stars, Stellar Systems and the Sun workshop”, Pasadena, 5-10 Novembre 2006

1) Observations of Achernar with VINCI (invited presentation at an international advanced school)

Kervella P., Euro Summer School “Observation and data reduction with the VLTI” , Goutelas, France (2006)

 

Conference proceedings:

102 articles, 28 as first author, ~340 citations, h-index=8. The articles more recent than 2009 are listed below.

- Interferometry, spectroscopy and astrometry of the bright eclipsing system δ Velorum

Kervella P., Mérand A., Pribulla T., Proc. Orbital Couples “Pas de Deux” workshop, Paris, October 2011.

- Proceedings “20th Stellar Pulsation Conference”, Granada, Espagne (2012)

Long-baseline interferometric observations of Cepheids, Kervella P., Mérand A., Gallenne A.

High accuracy interferometric radii of asteroseismic targets, Kervella P., Mérand A., et al.

Spectro-inteferometry of velocity-related phenomena at the surface of stars,

Mérand A., Aufdenberg J., Kervella P.

- The science of EchO, Tinetti G., Cho J. Y. K.,..., Kervella P. et al., Proc. IAU Symposium, 276, 359

- Journées de la SF2A 2011, Paris: http://proc.sf2a.asso.fr

Infrared excess and extended emission around Cepheids, Gallenne A., Kervella P., Mérand A., et al.

Surface convection: from the Sun to red giant stars, Piau L., Kervella P., Bib S., & Hauschildt P.

- Science with GRAVITY, the NIR Interferometric Imager

Paumard T., Gillessen S.,..., Kervella P. et al., Proc. “The Galactic Center”, Shanghai, China, Oct. 19-23, 2009. M. R. Morris, Q. D. Wang & Feng Yuan Eds, San Francisco: ASP Conf. Series 439, 267 (2011)

- GRAVITY: a four-telescope beam combiner instrument for the VLTI

Gillessen S., Eisenhauer F.,…, Kervella P., et al., Proc. SPIE "Optical and Infrared Interferometry II", 7734, 28 (2010)

- Development of a high-dynamic range imaging instrument for a single telescope by a pupil remapping system

Kotani T., Lacour S.,…, Kervella P., et al., Proc. SPIE "Optical and Infrared Interferometry II", 7734, 116 (2010)

- Status and new operation modes of the versatile VLT/NaCo

Girard J. H. V., Kasper M.,…, Kervella P., et al., Proc. SPIE "Adaptive Optics Systems II", 7736, 89 (2010)

- Hot stars and interferometry: Achernar and eta Carinae (présentation invitée)

Kervella P., Proc. Conf. “The interferometric view on hot stars”, 2-6 March 2009, ViĖa, Chile, RmxAC 38, 37 (2010)

- Interferometric views on the Cepheids

Mérand A., Kervella P., & Gallenne A., Proc. Conf. “The interferometric view on hot stars”, 2-6 March 2009, ViĖa, Chile, RmxAC 38, 102 (2010)

- Proceedings “Stellar Pulsation: Challenges for Theory and Observation”, AIP Conf. Proceedings vol. 1170

From the Dynamics of Cepheids to the Milky Way Rotation, and the Distance Scale Calibration

Nardetto, N., Kervella P., Barnes T., p. 13

What we learned from interferometric observations of Cepheids, Mérand A. & Kervella P., Gallenne A., p. 79

Thermal infrared observations of Cepheid envelopes with VLT/VISIR,

Gallenne A., Mérand A. & Kervella P.., p. 90

- Cepheids at high resolution: pulsation, distances and circumstellar envelopes

Gallenne A., Mérand A. & Kervella P., AAS #214, Bulletin of the American Astronomical Society, 41, 700 (2009)

- GRAVITY: microarcsecond astrometry and deep interferometric imaging with the VLT

Eisenhauer F.,..., Kervella P. et al., Proc. Ap&SS, ISBN 978-1-4020-9189-6,  Springer Netherlands, p. 361 (2009)

- PEGASE, an infrared interferometer to study stellar environments and low mass companions around nearby stars, Ollivier M., ..., Kervella P., et al., Experimental Astronomy, 23, 403 (2009)

- Exoplanet Characterization and the Search for Life

Kasting J., ..., Kervella P., et al. Science white paper prepared for the Astro2010 Decadal Review7 (2009)

- New Astrophysical Opportunities Exploiting Spatio-Temporal Optical Correlations

Barbieri C., ..., Kervella P., et al. Science white paper prepared for the Astro2010 Decadal Review7 (2009)

- Stellar Astrophysics with SIM and Optical Long Baseline Interferometry

Ridgway S. T., ..., Kervella P., et al., American Astronomical Society, AAS Meeting #213, #455.07 (2009)

- The complex environment of the fast rotating star Achernar

Kervella P., Domiciano de Souza A., Kanaan S., et al., Proc. SF2A 2008, 474, http://proc.sf2a.asso.fr

- High-resolution thermal IR imaging of MWC300 with VLT/VISIR

Domiciano de Souza A., Kervella P., Bendjoya Ph.; Niccolini G., Proc. SF2A 2008, p. 455, http://proc.sf2a.asso.fr

- Discovery of a Low-mass Planet Orbiting a Low-mass Star in Microlensing Event MOA-2007-BLG-192

Bennett D. P., ..., Kervella P., et al., American Astronomical Society, AAS Meeting #212, #10.12 (2008)

- Proceedings SPIE "Astronomical Telescopes and Instrumentation", Marseille (06/2008)

Toward a revival of Stellar Intensity Interferometry, LeBohec S.,..., Kervella P., et al.

Asteroseismology and interferometry (article invité), Schmider F.-X.,..., Kervella P., et al.

GRAVITY: getting to the event horizon of Sgr A*, Eisenhauer F.,..., Kervella P. et al.

VEGA: a new Visible spEctroGraph and polArimeter on CHARA, Mourard D.,..., Kervella P., et al.

- Stellar radii from long-baseline interferometry

Kervella P., IAU Symp. 252, p. 405, "The Art of Modeling Stars in the 21st Century", Sanya, China, 5-11 April 2008

- Proceedings The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation Instrumentation, ESO Astrophysics Symposia, Volume ISBN 978-3-540-74253-1. Springer (2008):

Fundamental parameters of d Vel, Kellerer A., Petr-Gotzens M., Kervella P., & Coudé du Foresto C., p. 531

Interferometric aperture synthesis of Altair, Domiciano de Souza A., Kervella P., Jankov S., et al., p. 487

Evolutionary modeling of nearby stars using asteroseismic and interferometric constraints

Kervella P., & Thévenin F., p. 479

GENIE: a Ground-Based Nulling Instrument at ESO VLTI, Gondoin Ph.,..., Kervella P., et al., p. 445

h Car through the Eyes of Interferometers, Chesneau O.,..., Kervella P., et al., p. 131

Cepheid observations using CHARA/FLUOR: a Umi and d Cep, Mérand A., Kervella P., et al., p. 99

Cepheid Distances from Interferometry, Kervella P., Nardetto N., Bersier D., et al., p. 83

Limb Darkening: Getting Warmer, Aufdenberg, J. P., Ludwig H.-G., Kervella P., et al., p. 71

- New facts about d Velorum: fewer but larger components, Kellerer A., Petr-Gotzens M., Kervella P., Coudé du Foresto A., "Multiple Stars Across the H-R Diagram", ESO Ast.Symp., ISBN 978-3-540-74744-4., p. 119 (2008)

- GRAVITY: microarcsecond astrometry and deep interferometric imaging with the VLTI

Ensenhauer F.,..., Kervella P., et al., "A Giant Step: from Milli- to Micro-arcsecond Astrometry", Proc. International Astronomical Union, IAU Symposium, Volume 248, p. 100 (2008)

- Abundance analysis of  AlphaCen A : The 3D hydrodynamical approach

Bigot L., Thévenin F., Kervella P., Mem. S.A.It., 79, 3 (2008)

- Nonlinear pulsations and hydrodynamics of Cepheids, Goupil M.-J., Koláth Z., Nardetto N., Kervella P.,

Proc. “The pulsation of Cepheids – the CASSINI project” conference, EAS Publications Series, 38 (2009)

- Prospects for a multi-wavelength characterization of Cepheid envelopes

Kervella P., Mérand A., Proc. “The pulsation of Cepheids – the CASSINI project”, EAS Pub. Series, 38, 143 (2009)

 

Habilitation ą Diriger des Recherches:

Application of interferometry to the study of Cepheids and dwarf stars

Defended on 11 July 2007 at Institut d’Astrophysique de Paris

Manuscript (in french): http://tel.archives-ouvertes.fr/tel-00258916/en/

Jury: G. Rousset (President), A. Barrau (Referee), A. Chelli (Referee), P. Léna (Referee), D. Bersier, P. Fouqué,

D. Mourard, F. Thévenin

Optical interferometry is a powerful technique for the study of stars in exquisite details, by enabling the spatial resolution of their disks. I present three applications of this technique to the study of different types of stars: Cepheids, main sequence stars, and fast rotators. Cepheids are a famous class of supergiants that are widely used as standard candles for distance measurements, through the period-luminosity (P-L) relations. Interferometry allows to apply a refined version of the Baade--Wesselink method to estimate the distance to nearby Cepheids, and therefore calibrate the P--L relations. While this method is promising and potentially very precise, several points in its application are critical, in particular the projection factor. Main sequence stars are by far the most numerous stellar class in the universe, as all stars spend the majority of their life as dwarfs. I have applied interferometry to a broad range of main sequence stars, from the very low mass {Proxima} to hot stars. In particular, I have realized the first combination of interferometric and asteroseismic constraints for the modeling of stars (the two components of Alpha Centauri, as well as other stars). In a third part, I describe the recent results that we have obtained on fast rotating stars. Due to the very strong centrifugal force at the equator, the photosphere of these stars is strongly distorted. Interferometry allows to observe these deformations, and I describe our observations of three bright, fast rotating stars: Altair, Achernar and Vega.

 

PhD Thesis:

Optical interferometry with the VLT – Application to the study of Cepheids

Defended on 14 November 2001 at the Observatoire de Paris, in Meudon, with High Honors

Manuscript (in french): http://tel.archives-ouvertes.fr/tel-00258928/en/

Advisors: P. Léna (Paris 7 Univ.), V. Coudé du Foresto (Obs. de Paris) and A. Glindemann (ESO)

Jury: D. Rouan (President), D. Mourard (Referee), S. T. Ridgway (Referee), P. Léna (supervisor), A. Glindemann (supervisor), V. Coudé du Foresto

Installed at the heart of the Very Large Telescope Interferometer (VLTI, located on top of the Cerro Paranal, in northern Chile), the VINCI instrument allows to combine coherently the infrared light coming from two separate telescopes. Therefore, it opens an access to very high angular resolution observations of the sky (down to a few milliarcseconds). Many important astrophysical questions will be adressed by this instrumen t: the physics of stars, protoplanetary disks and extrasolar planets, among other programs. My thesis work on the VINCI instrument has covered its conception, in particular the functionnal definition of its software system, its installation on top of the Cerro Paranal and its first scientific observations. In the first part of this document, I describe the principles of the beam combination with VINCI and its performances both in the laboratory and in real observational conditions.

In a second part, I describe the application of long-baseline optical interferometry to the study of the Cepheid variable stars. These pulsating supergiants play a fundamental role in the measurement of distances in the Universe, since it has been established that their photometric variation period it linked to their intrinsic luminosity through the famous period-luminosity relationship. The calibration of this relation requires that the distance to a number of nearby Cepheids is measured directly, unfortunately, these distances are currently poorly known, even to the closest Cepheids. The very high angular resolution allowed by VINCI and the VLTI will soon enable the refined study of the pulsation of the nearby Cepheids. By combining simultaneous observations of the radial velocity of their photosphere with angular diameter measurements, it will be possible to estimate directly their distance. The goal of this program: the calibration of the period-luminosity relationship with a precision better than 0,01 mag, a factor ten better than our current knowledge. In addition to this fundamental program, I decribe also the possibilities offered by VINCI for the study of the main sequence dwarfs, in particular solar-type stars (with an application to the binary star Aplha Centauri A and B), and I briefly discuss the case of the extrasolar giant planets.

 

Reports and technical documents:

In the framework of my current work on the GRAVITY instrument, I have been the main author or co-author of several technical documents listed below.

Reference:                                  Title:                                                                 Version              Date

VLT-TRE-GRA-15884-4358    Calibrations and Data Reduction Lib. Specs.            v2.0                  26.10.09

VLT-TRE-GRA-15882-1001    Science Cases & Observing Strategies                     v1.0                  30.10.09

VLT-SPE-GRA-15882-9501    Data Reduction Library Specifications                     v1.0                  30.10.09

VLT-PLA-GRA-15882-9502    Instrument Calibration Plan                                   v1.0                  30.10.09

VLT-SPE-GRA-15882-9502    Data Reduction Library design                               v1.0                  31.07.11    

VLT-SPE-GRA-15882-9503    Data Reduction Library validation and tests              v1.0                  31.07.11   

VLT-TRE-GRA-15882-9602    Data Reduction Software data description                 v3.0                  31.07.11              

VLT-SPE-GRA-15882-9505    Exposure Time Calculator Specifications                 v1.0                  31.07.11

VLT-PLA-GRA-15882-9502    Instrument Calibration Plan                                   v3.0                  31.07.11                           

VLT-LIS-GRA-15882-9503    Calibration Plan appendix (binary calibrators)           v3.0                  31.07.11

VLT-MAN-GRA-15882-1010    Template Manual                                                v3.0                  31.07.11

 

Other publications:

- GRAVITY : Observing the Universe in motion, Eisenhauer F.,…, Kervella P., et al., ESO Messenger 143, 16 (2011)

- Article “Interferometry”, Encyclopedia of Astrobiology, Part 9, Pages 816-819, Springer-Verlag (2011), Kervella P.

- Bételgeuse: une étoile au crépuscule de sa vie, Kervella P. & Perrin G., La Recherche, 445 (October 2010)

- From the Dynamics of Cepheids to the Milky Way Rotation and the Calibration of the Distance Scale

Nardetto N., Kervella P., Barnes T., et al., ESO Messenger, 134, 20 (2008)

- Les étoiles déformées par la rotation, Kervella P., Pour la Science, 329 (March 2005)

- Recent scientific results from the VLTI, Wittkowski M., ..., Kervella P., et al., ESO Messenger, 119, 36 (2005)

- L’influence de la rotation sur la forme des étoiles

Kervella P., Journal de l’Association Astronomique de Franche-Comté “Le Point Astro” (November 2005)

- Cepheid pulsations resolved by the VLTI, Kervella P., et al., ESO Messenger, 117, 53 (2004)

- The VLTI Data Flow System: from observation preparation to data processing

Ballester P., Kervella P., Rasmussen L. P., Richichi A., Sabet C., Schöller M., et al., ESO Messenger, 106, 2 (2001)

- First fringes with ANTU and MELIPAL

Glindemann A., ,…, Kervella P.,  et al., ESO Messenger, 106, 1 (2001)

- Light at the end of the tunnel - First Fringes with the VLTI

Glindemann A., Bauvir B., Delplancke F.,..., Kervella P., et al., ESO Messenger, 104, 2 (2001)

- The VLTI – The Observatory of the 21st Century

Glindemann A., Abuter R., Carbognani F.,..., Kervella P., et al., ESO Messenger, 98, 2 (1999)

 

Press releases, media and outreach:

The press releases listed below received a good echo in the media (internet, press, radio, TV).

Our recent results on Betelgeuse were in particular reported in the Cosmic Front (52 min) series of the japanese NHK TV, broadcasted on 21 June 2011 in prime time (http://pf.nhk-ep.co.jp/detail/1524).

Public conference at the CollŹge de France “Bételgeuse ą Haute Résolution Angulaire”, 9 Feb. 2011

The Flames of Betelgeuse – June 2011, http://www.eso.org/public/news/eso1121/

Sharpest views of Betelgeuse– July 2009, http://www.eso.org/public/news/eso0927/

Light echoes tell the distance to a Cepheid – February 2008, http://www.eso.org/public/news/eso0805/

Cepheids and their 'Cocoons' – February 2006, http://www.eso.org/public/news/eso0609/

Measuring Cosmic Distances with Stellar Heart Beats – Oct. 2004, http://www.eso.org/public/news/eso0432/

Public conference at the CollŹge de France “PremiŹres observations de Céphéides avec le VLTI”, 19 Mai 2004

The Flattest Star Ever Seen – June 2003, http://www.eso.org/public/news/eso0316/

A Family Portrait of the α Centauri System –  March 2003, http://www.eso.org/public/news/eso0307/

How Small are Small Stars really ? – November 2002, http://www.eso.org/public/news/eso0232/

Four Eyes are Better – September 2002, http://www.eso.org/public/news/eso0225/

Giant Eyes for the VLT Interferometer – November 2001, http://www.eso.org/public/news/eso0134/

First Light for the VLT Interferometer – March 2001, http://www.eso.org/public/news/eso0111/

MONA, LISA and VINCI soon to travel to Paranal – Nov. 2000, http://www.eso.org/public/news/eso0038/