Abstract
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.
| Original language | English (US) |
|---|---|
| Article number | 124 |
| Journal | Astrophysical Journal |
| Volume | 860 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jun 20 2018 |
Fingerprint
Keywords
- planetdisk interactions
- planets and satellites: formation
- protoplanetary disks
- stars: individual (MWC 758)
- stars: variables: T Tauri, Herbig Ae/Be
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk. / Dong, Ruobing; Liu, Sheng Yuan; Eisner, Joshua A; Andrews, Sean; Fung, Jeffrey; Zhu, Zhaohuan; Chiang, Eugene; Hashimoto, Jun; Liu, Hauyu Baobab; Casassus, Simon; Esposito, Thomas; Hasegawa, Yasuhiro; Muto, Takayuki; Pavlyuchenkov, Yaroslav; Wilner, David; Akiyama, Eiji; Tamura, Motohide; Wisniewski, John.
In: Astrophysical Journal, Vol. 860, No. 2, 124, 20.06.2018.Research output: Contribution to journal › Article
}
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, Joshua A
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
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
UR - http://www.scopus.com/inward/record.url?scp=85049222431&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85049222431&partnerID=8YFLogxK
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 -