Accueil > Publications > Catalogue POP > 2019

Catalogue POP – Notice individuelle de publication

Maire Anne-Lise, Stolker T., Messina Sergio, Müller A., Biller B. A., Currie T. M., Dominik Carsten, Grady Carol A., Boccaletti Anthony, Bonnefoy Mickaël, Chauvin Gaël, Galicher Raphaël, Millward M., Pohl Adriana, Brandner W., Henning Thomas, Lagrange Anne-Marie, Langlois Maud, Meyer Michael R., Quanz Sascha P., Vigan Arthur, Zurlo Alice, Van Boekel Roy, Buenzli E., Buey Jean-Tristan, Desidera Silvano, Feldt M., Fusco Thierry, Ginski Christian, Giro Enrico, Gratton R. G., Hubin Norbert N., Lannier J., Le Mignant David, Mesa Dino, Peretti S., Perrot Clément, Ramos José Ricardo, Salter Graeme, Samland M., Sissa E., Stadler Eric, Thalmann Christian, Udry Stéphane, Weber L.

Testing giant planet formation in the transitional disk of SAO 206462 using deep VLT/SPHERE imaging

Astronomy and Astrophysics, 2017, vol. 601

Référence ADS : 2017A&A...601A.134M

Résumé :

Context. The SAO 206462 (HD 135344B) disk is one of the few known transitional disks showing asymmetric features in scattered light and thermal emission. Near-infrared scattered-light images revealed two bright outer spiral arms and an inner cavity depleted in dust. Giant protoplanets have been proposed to account for the disk morphology. <BR /> Aims: We aim to search for giant planets responsible for the disk features and, in the case of non-detection, to constrain recent planet predictions using the data detection limits. <BR /> Methods: We obtained new high-contrast and high-resolution total intensity images of the target spanning the Y to the K bands (0.95-2.3 mum) using the VLT/SPHERE near-infrared camera and integral field spectrometer. <BR /> Results: The spiral arms and the outer cavity edge are revealed at high resolutions and sensitivities without the need for aggressive image post-processing techniques, which introduce photometric biases. We do not detect any close-in companions. For the derivation of the detection limits on putative giant planets embedded in the disk, we show that the knowledge of the disk aspect ratio and viscosity is critical for the estimation of the attenuation of a planet signal by the protoplanetary dust because of the gaps that these putative planets may open. Given assumptions on these parameters, the mass limits can vary from 2-5 to 4-7 Jupiter masses at separations beyond the disk spiral arms. The SPHERE detection limits are more stringent than those derived from archival NaCo/L' data and provide new constraints on a few recent predictions of massive planets (4-15 M<SUB>J</SUB>) based on the spiral density wave theory. The SPHERE and ALMA data do not favor the hypotheses on massive giant planets in the outer disk (beyond 0.6''). There could still be low-mass planets in the outer disk and/or planets inside the cavity.

Retour au catalogue