ALMA imaging of the M-dwarf Fomalhaut C's debris disc
Published version
Peer-reviewed
Repository URI
Repository DOI
Change log
Authors
Abstract
jats:titleABSTRACT</jats:title> jats:pFomalhaut 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 that 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 3σ 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 12CO 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.</jats:p>
Description
Keywords
Journal Title
Conference Name
Journal ISSN
1365-2966
Volume Title
Publisher
Publisher DOI
Rights
Sponsorship
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (823823)