Asymmetric features in the protoplanetary disk MWC 758

被引:238
作者
Benisty, M. [1 ,2 ]
Juhasz, A. [3 ]
Boccaletti, A. [4 ]
Avenhaus, H. [5 ]
Milli, J. [6 ]
Thalmann, C. [7 ]
Dominik, C. [8 ]
Pinilla, P. [9 ]
Buenzli, E. [10 ]
Pohl, A. [10 ,11 ]
Beuzit, J. -L. [1 ,2 ]
Birnstiel, T. [12 ]
de Boer, J. [6 ,9 ]
Bonnefoy, M. [1 ,2 ]
Chauvin, G. [1 ,2 ]
Christiaens, V. [5 ]
Garufi, A. [7 ]
Grady, C. [13 ,14 ]
Henning, T. [10 ]
Huelamo, N. [15 ]
Isella, A. [16 ]
Langlois, M. [17 ]
Menard, F. [1 ,2 ,18 ,19 ]
Mouillet, D. [1 ,2 ]
Olofsson, J. [10 ]
Pantin, E. [20 ]
Pinte, C. [1 ,2 ,18 ,19 ]
Pueyo, L. [21 ]
机构
[1] Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France
[2] CNRS, IPAG, F-38000 Grenoble, France
[3] Inst Astron, Cambridge CB3 OHA, England
[4] Univ Paris 07, Univ Paris 06, CNRS, LESIA,Observ Paris, F-92195 Meudon, France
[5] Univ Chile, Dept Astron, Santiago, Chile
[6] ESO, Santiago, Chile
[7] ETH, Inst Astron, CH-8093 Zurich, Switzerland
[8] Sterrenkundig Inst Anton Pannekoek, NL-1098 XH Amsterdam, Netherlands
[9] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
[10] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[11] Heidelberg Univ, Inst Theoret Astrophys, D-69120 Heidelberg, Germany
[12] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[13] Eureka Sci, Greenbelt, MD 20771 USA
[14] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[15] Ctr Astrobiol INTA CSIC, Villanueva De La Canada 28691, Spain
[16] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA
[17] Univ Lyon 1, CNRS, Ecole Normale Super Lyon, Observ Lyon,Ctr Rech Astrophys Lyon,UMR 5574, F-69230 St Genis Laval, France
[18] Univ Chile, CNRS INSU, UMI FCA, France UMI 3386, Santiago, Chile
[19] Univ Chile, Dept Astron, Santiago, Chile
[20] Univ Paris Diderot, CNRS, CEA DSM, Lab AIM,IRFU SAp, F-91191 Gif Sur Yvette, France
[21] Space Telescope Sci Inst, Baltimore, MD 21218 USA
基金
美国国家科学基金会;
关键词
techniques: high angular resolution; protoplanetary disks; HD; 142527; IMAGING POLARIMETRY; TRANSITIONAL DISKS; DUST FILTRATION; SPIRAL ARMS; GAP EDGES; PLANET; EVOLUTION; VLT/NACO; MWC-758;
D O I
10.1051/0004-6361/201526011
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. The study of dynamical processes in protoplanetary disks is essential to understand planet formation. In this context, transition disks are prime targets because they are at an advanced stage of disk clearing and may harbor direct signatures of disk evolution. Aims. We aim to derive new constraints on the structure of the transition disk MWC 758, to detect non-axisymmetric features and understand their origin. Methods. We obtained infrared polarized intensity observations of the protoplanetary disk MWC 758 with VLT/SPHERE at 1.04 mu m to resolve scattered light at a smaller inner working angle (0.093 '') and a higher angular resolution (0.027 '') than previously achieved. Results. We observe polarized scattered light within 0.53 '' (148 au) down to the inner working angle (26 au) and detect distinct non-axisymmetric features but no fully depleted cavity. The two small-scale spiral features that were previously detected with HiCIAO are resolved more clearly, and new features are identified, including two that are located at previously inaccessible radii close to the star. We present a model based on the spiral density wave theory with two planetary companions in circular orbits. The best model requires a high disk aspect ratio (H/r similar to 0.20 at the planet locations) to account for the large pitch angles which implies a very warm disk. Conclusions. Our observations reveal the complex morphology of the disk MWC 758. To understand the origin of the detected features, the combination of high-resolution observations in the submillimeter with ALMA and detailed modeling is needed.
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页数:7
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