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ALMA imaging of the M-dwarf Fomalhaut C's debris disc
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Cronin-Coltsmann, Patrick, Kennedy, Grant M., Kalas, Paul, Milli, Julien, Clarke, Cathie J., Duchêne, Gaspard, Greaves, Jane, Lawler, Samantha M., Lestrade, Jean-Francois, Matthews, Brenda C., Shannon, Andrew and Wyatt, Mark C. (2021) ALMA imaging of the M-dwarf Fomalhaut C's debris disc. Monthly Notices of the Royal Astronomical Society, 504 (3). pp. 4497-4510. stab1237. doi:10.1093/mnras/stab1237
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WRAP-ALMA-imaging-M-dwarf-Fomalhaut-C's-debris-disc-Kennedy-2021.pdf - Accepted Version - Requires a PDF viewer. Download (4Mb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stab1237
Abstract
Fomalhaut C (LP 876-10) is a low mass M4V star in the intriguing Fomalhaut triple system and, like Fomalhaut A, possesses a debris disc. It is one of very few nearby M-dwarfs known to host a debris disc and of these has by far the lowest stellar mass. We present new resolved observations of the debris disc around Fomalhaut C with the Atacama Large Millimetre Array which allow us to model its properties and investigate the system's unique history. The ring has a radius of 26 au and a narrow full width at half maximum of at most 4.2 au. We find a 3 σ upper limit on the eccentricity of 0.14, neither confirming nor ruling out previous dynamic interactions with Fomalhaut A that could have affected Fomalhaut C's disc. We detect no 12 CO J=3-2 emission in the system and do not detect the disc in scattered light with HST/STIS or VLT/SPHERE. We find the original Herschel detection to be consistent with our ALMA model's radial size. We place the disc in the context of the wider debris disc population and find that its radius is as expected from previous disc radius-host luminosity trends. Higher signal-to-noise observations of the system would be required to further constrain the disc properties and provide further insight to the history of the Fomalhaut triple system as a whole.
| Item Type: | Journal Article | ||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Low mass stars , Double stars, Circumstellar matter , Planetary systems , Disks (Astrophysics) | ||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||
| Publisher: | Oxford University Press | ||||||||||||||||||||||||
| ISSN: | 1745-3933 | ||||||||||||||||||||||||
| Official Date: | July 2021 | ||||||||||||||||||||||||
| Dates: |
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| Volume: | 504 | ||||||||||||||||||||||||
| Number: | 3 | ||||||||||||||||||||||||
| Page Range: | pp. 4497-4510 | ||||||||||||||||||||||||
| Article Number: | stab1237 | ||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stab1237 | ||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Patrick F Cronin-Coltsmann, Grant M Kennedy, Paul Kalas, Julien Milli, Cathie J Clarke, Gaspard Duchêne, Jane Greaves, Samantha M Lawler, Jean-François Lestrade, Brenda C Matthews, Andrew Shannon, Mark C Wyatt, ALMA imaging of the M-dwarf Fomalhaut C’s debris disc, Monthly Notices of the Royal Astronomical Society, 2021;, stab1237, is available online at: https://doi.org/10.1093/mnras/stab1237 | ||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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