Direct detection of scattered light gaps in the transitional disk around HD97048 with VLT/SPHERE Article - Novembre 2016

C. Ginski, T. Stolker, P. Pinilla, C. Dominik, A. Boccaletti, J. Boer, M. Benisty, B. Biller, M. Feldt, A. Garufi, C. U. Keller, M. Kenworthy, A. L. Maire, F. Ménard, D. Mesa, J. Milli, M. Min, C. Pinte, S. P. Quanz, R. Boekel, M. Bonnefoy, G. Chauvin, S. Desidera, R. Gratton, J. H. V. Girard, M. Keppler, T. Kopytova, A. -M. Lagrange, M. Langlois, D. Rouan, Arthur Vigan

C. Ginski, T. Stolker, P. Pinilla, C. Dominik, A. Boccaletti, J. Boer, M. Benisty, B. Biller, M. Feldt, A. Garufi, C. U. Keller, M. Kenworthy, A. L. Maire, F. Ménard, D. Mesa, J. Milli, M. Min, C. Pinte, S. P. Quanz, R. Boekel, M. Bonnefoy, G. Chauvin, S. Desidera, R. Gratton, J. H. V. Girard, M. Keppler, T. Kopytova, A. -M. Lagrange, M. Langlois, D. Rouan, Arthur Vigan, « Direct detection of scattered light gaps in the transitional disk around HD97048 with VLT/SPHERE  », Astronomy and Astrophysics - A&A, novembre 2016. ISSN 0004-6361

Abstract

Aims. We studied the well-known circumstellar disk around the Herbig Ae/Be star HD97048 with high angular resolution to reveal undetected structures in the disk which may be indicative of disk evolutionary processes such as planet formation. Methods. We used the IRDIS near-IR subsystem of the extreme adaptive optics imager SPHERE at the ESO/VLT to study the scattered light from the circumstellar disk via high resolution polarimetry and angular differential imaging. Results. We imaged the disk in unprecedented detail and revealed four ring-like brightness enhancements and corresponding gaps in the scattered light from the disk surface with radii between 39 au and 341 au. We derived the inclination and position angle as well as the height of the scattering surface of the disk from our observational data. We found that the surface height profile can be described by a single power law up to a separation similar to 270 au. Using the surface height profile we measured the scattering phase function of the disk and found that it is consistent with theoretical models of compact dust aggregates. We discuss the origin of the detected features and find that low mass (\textless= 1 M-Jup) nascent planets are a possible explanation.

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