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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731520.0, MPI für Astronomie / Publikationen_mpia
Circumstellar disks of the most vigorously accreting young stars
Authors:Liu, H. B.; Takami, M.; Kudo, T.; Hashimoto, J.; Dong, R.; Vorobyov, E. I.; Pyo, T.-S.; Fukagawa, M.; Tamura, M.; Henning, T.; Dunham, M. M.; Karr, J. L.; Kusakabe, N.; Tsuribe, T.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Science Advances
Issue / Number:2
Start Page:id. e1500875 (7 pp)
Audience:Not Specified
Abstract / Description:Young stellar objects (YSOs) may not accumulate their mass steadily, as was previously thought, but in a series of violent events manifesting themselves as sharp stellar brightening. These events can be caused by fragmentation due to gravitational instabilities in massive gaseous disks surrounding young stars, followed by migration of dense gaseous clumps onto the star. We report our high angular resolution, coronagraphic near-infrared polarization imaging observations using the High Contrast Instrument for the Subaru Next Generation Adaptive Optics (HiCIAO) of the Subaru 8.2 m Telescope, towards four YSOs which are undergoing luminous accretion outbursts. The obtained infrared images have verified the presence of several hundred AUs scale arms and arcs surrounding these YSOs. In addition, our hydrodynamics simulations and radiative transfer models further demonstrate that these observed structures can indeed be explained by strong gravitational instabilities occurring at the beginning of the disk formation phase. The effect of those tempestuous episodes of disk evolution on star and planet formation remains to be understood.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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