The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk

Ruobing Dong, Sheng Yuan Liu, Joshua A Eisner, Sean Andrews, Jeffrey Fung, Zhaohuan Zhu, Eugene Chiang, Jun Hashimoto, Hauyu Baobab Liu, Simon Casassus, Thomas Esposito, Yasuhiro Hasegawa, Takayuki Muto, Yaroslav Pavlyuchenkov, David Wilner, Eiji Akiyama, Motohide Tamura, John Wisniewski

Research output: Contribution to journalArticle

34 Citations (Scopus)

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 languageEnglish (US)
Article number124
JournalAstrophysical Journal
Volume860
Issue number2
DOIs
StatePublished - Jun 20 2018

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eccentrics
clumps
cavity
cavities
rings
dust
eccentricity
near infrared
ellipse
protoplanetary disks
scale height
ellipses
angular resolution
planet
planets
wavelength
projection
continuums
stars
approximation

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 journalArticle

Dong, R, Liu, SY, Eisner, JA, Andrews, S, Fung, J, Zhu, Z, Chiang, E, Hashimoto, J, Liu, HB, Casassus, S, Esposito, T, Hasegawa, Y, Muto, T, Pavlyuchenkov, Y, Wilner, D, Akiyama, E, Tamura, M & Wisniewski, J 2018, 'The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk', Astrophysical Journal, vol. 860, no. 2, 124. https://doi.org/10.3847/1538-4357/aac6cb
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. / The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk. In: Astrophysical Journal. 2018 ; Vol. 860, No. 2.
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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

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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.

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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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