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Next: Session 2: Adaptive Optics Up: Session 1: Ground based Previous: Jean Borsenberger, Bertrand DeBatz,


Patrice Bouchet, Eli Dwek, I. John Danziger, Richard G. Arendt, I. James M. De Buizer, Sangwook Park, Nicholas B. Suntzfeff, Robert P. Kirshner, and Peter Challis
SN1987A AFTER 18 YEARS: MID-INFRARED GEMINI AND SPITZER OBSERVATIONS OF THE REMNANT (Poster)

SN1987A AFTER 18 YEARS: MID-INFRARED GEMINI AND SPITZER OBSERVATIONS OF THE REMNANT


Patrice Bouchet(1), Eli Dwek(2), I. John Danziger(3), Richard G. Arendt(4), I. James M. De Buizer(5), Sangwook Park(6), Nicholas B. Suntzfeff(7), Robert P. Kirshner(8), and Peter Challis(8)
(1)GEPI Observatoire de Paris, France
(2)NASA, GSFC, Greenbelt, MD 20771, USA
(3)Osservatorio di Trieste, Italy
(4)SSAI, GSFC, Greenbelt, MD 20771, USA
(5)Gemini Observatory, La Serena, Chile
(6)Pennsylvania State University, 525 Davey Laboratory, PA 16802, USA
(7)Cerro Tololo Interamerican Observatory, NOAO, La Serena, Chile
(8)Harvard-Smithsonian, CfA, Cambridge, MA 02138, USA


We present high resolution 11.7 and 18.3 um mid-IR images of SN 1987A obtained on day 6526 since the explosion with the Thermal-Region Camera and Spectrograph (T-ReCS) attached to the Gemini South 8m telescope. The images show that all the emission arises from the equatorial ring (ER). Near contemporaneous spectra obtained on day 6184 with the MIPS, IRAC and IRS instruments on board the Spitzer Space Telescope show that the emission consists of thermal emission from silicate dust that condensed out in the red giant wind of the progenitor star. The dust temperature is 166(+18, -12) K, and the emitting dust mass is 2.6(+2;0, -1.4) 10-6 Solar Mass. Comparison of the mid-IR Gemini images with X-ray images obtained by Chandra, UV-Optical images obtained by HST, and radio synchrotron images obtained by the ATCA show generally good correlation of the images across all wavelengths. Because of the limited resolution of the mid-IR images the location or heating mechanism of the dust giving rise to the emission cannot be uniquely determined. The dust could be collisionally heated by the X-ray emitting plasma, providing a unique diagnostic of plasma conditions. Alternatively, the dust could be radiatively heated in the dense UV-optical knots that are overrun by the advancing supernova blast wave. In either case the dust-to-gas mass ratio in the circumstellar medium around the supernova is significantly lower than that in the general interstellar medium of the LMC, suggesting either a low condensation efficiency in the wind of the progenitor star, or the efficient destruction of the dust by the SN blast wave. Overall, we are witnessing the interaction of the SN blast wave with its surrounding medium, creating an environment that is rapidly evolving at all wavelengths. Continuous multi wavelengths observations of SN 1987A such as these provide unique snapshots of the very early evolution of supernova remnant, and shed some light on the role of supernovae in the dust production in the universe.


next up previous
Next: Session 2: Adaptive Optics Up: Session 1: Ground based Previous: Jean Borsenberger, Bertrand DeBatz,
LESIA, Observatoire de Paris
2006-03-16