TY - JOUR
T1 - The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk
AU - Dong, Ruobing
AU - Liu, Sheng Yuan
AU - Eisner, Josh
AU - Andrews, Sean
AU - Fung, Jeffrey
AU - Zhu, Zhaohuan
AU - Chiang, Eugene
AU - Hashimoto, Jun
AU - Liu, Hauyu Baobab
AU - Casassus, Simon
AU - Esposito, Thomas
AU - Hasegawa, Yasuhiro
AU - Muto, Takayuki
AU - Pavlyuchenkov, Yaroslav
AU - Wilner, David
AU - Akiyama, Eiji
AU - Tamura, Motohide
AU - Wisniewski, John
N1 - Funding Information:
We are grateful to Hui Li for useful discussions, Myriam Benisty for making available the SPHERE image of MWC 758, and an anonymous referee for constructive suggestions that largely improved the quality of the paper. Numerical calculations were performed on the SAVIO cluster provided by the Berkeley Research Computing program, supported by the UC Berkeley Vice Chancellor for Research and the Berkeley Center for Integrative Planetary Science. Y.P. was supported by Russian Science Foundation grant 17-12-01168. This paper makes use of the following ALMA data: 2017.1.00492.S. ALMA is a partnership of the ESO (representing its member states), NSF (USA), and NINS (Japan), together with the NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by the ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Y.H. is currently supported by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. This work was supported by NAOJ ALMA Scientific Research Grant Number 2016-02A.
Publisher Copyright:
© 2018. The American Astronomical Society.
PY - 2018/6/20
Y1 - 2018/6/20
N2 - Spatially resolved structures in protoplanetary disks hint at unseen planets. Previous imaging observations of the transitional disk around MWC 758 revealed an inner cavity, a ring-like outer disk, emission clumps, and spiral arms, all possibly generated by companions. We present ALMA dust continuum observations of MWC 758 at 0.87 mm wavelength with 43 ×39 mas angular resolution (6.9 ×6.2 au) and 20 μJy beam-1 rms. The central submillimeter emission cavity is revealed to be eccentric; once deprojected, its outer edge can be well fitted by an ellipse with an eccentricity of 0.1 and one focus on the star. The broad ring-like outer disk is resolved into three narrow rings with two gaps in between. The outer two rings tentatively show the same eccentricity and orientation as the innermost ring bounding the inner cavity. The two previously known dust emission clumps are resolved in both the radial and azimuthal directions, with radial widths equal to ∼4×the local scale height. Only one of the two spiral arms previously imaged in near-infrared (NIR) scattered light is revealed in ALMA dust emission, at a slightly larger stellocentric distance owing to projection effects. We also submit evidence of disk truncation at ∼100 au based on comparing NIR imaging observations with models. The spirals, the north clump, and the truncated disk edge are all broadly consistent with the presence of one companion exterior to the spirals at roughly 100 au.
AB - Spatially resolved structures in protoplanetary disks hint at unseen planets. Previous imaging observations of the transitional disk around MWC 758 revealed an inner cavity, a ring-like outer disk, emission clumps, and spiral arms, all possibly generated by companions. We present ALMA dust continuum observations of MWC 758 at 0.87 mm wavelength with 43 ×39 mas angular resolution (6.9 ×6.2 au) and 20 μJy beam-1 rms. The central submillimeter emission cavity is revealed to be eccentric; once deprojected, its outer edge can be well fitted by an ellipse with an eccentricity of 0.1 and one focus on the star. The broad ring-like outer disk is resolved into three narrow rings with two gaps in between. The outer two rings tentatively show the same eccentricity and orientation as the innermost ring bounding the inner cavity. The two previously known dust emission clumps are resolved in both the radial and azimuthal directions, with radial widths equal to ∼4×the local scale height. Only one of the two spiral arms previously imaged in near-infrared (NIR) scattered light is revealed in ALMA dust emission, at a slightly larger stellocentric distance owing to projection effects. We also submit evidence of disk truncation at ∼100 au based on comparing NIR imaging observations with models. The spirals, the north clump, and the truncated disk edge are all broadly consistent with the presence of one companion exterior to the spirals at roughly 100 au.
KW - planetdisk interactions
KW - planets and satellites: formation
KW - protoplanetary disks
KW - stars: individual (MWC 758)
KW - stars: variables: T Tauri, Herbig Ae/Be
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U2 - 10.3847/1538-4357/aac6cb
DO - 10.3847/1538-4357/aac6cb
M3 - Article
AN - SCOPUS:85049222431
VL - 860
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 124
ER -