ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin

Abstract

We present new ALMA Band 7 observations of the edge-on debris disc around the M1V star GSC 07396-00759. At ~20 Myr old and in the beta Pictoris Moving Group along with AU Mic, GSC 07396-00759 joins it in the handful of low mass M-dwarf discs to be resolved in the sub-mm. With previous VLT/SPHERE scattered light observations we present a multi-wavelength view of the dust distribution within the system under the effects of stellar wind forces. We find the mm dust grains to be well described by a Gaussian torus at 70 au with a FWHM of 48 au and we do not detect the presence of CO in the system. Our ALMA model radius is significantly smaller than the radius derived from polarimetric scattered light observations, implying complex behaviour in the scattering phase function. The brightness asymmetry in the disc observed in scattered light is not recovered in the ALMA observations, implying that the physical mechanism only affects smaller grain sizes. High resolution follow-up observations of the system would allow investigation into its unique dust features as well as provide a true coeval comparison for its smaller sibling AU Mic, singularly well observed amongst M-dwarfs systems.

14 pages, 11 figures, 1 table, Accepted for publication in MNRAS

References in corpus (30)

• The Gaia mission
• A stellar-mass-dependent drop in planet occurrence rates
• Probing for Exoplanets Hiding in Dusty Debris Disks: Disk Imaging, Characterization, and Exploration with HST/STIS Multi-Roll Coronagraphy
• Detection of exocometary CO within the 440 Myr-old Fomalhaut belt: a similar CO+CO${}_2$ ice abundance in exocomets and Solar System comets
• Debris from giant impacts between planetary embryos at large orbital radii
• Dynamical traceback age of the $\beta$ Pictoris moving group
• Outer edges of debris discs: how sharp is sharp?
• All-sky Co-moving Recovery Of Nearby Young Members. (ACRONYM) II: The Beta Pictoris Moving Group
• Kuiper Belt-Like Hot and Cold Populations of Planetesimal Inclinations in the $\beta$ Pictoris Belt Revealed by ALMA
• CO mass upper limits in the Fomalhaut ring - the importance of NLTE excitation in debris discs and future prospects with ALMA
• The dispersal of protoplanetary disks around binary stars
• ALMA observations of the narrow HR 4796A debris ring
• The Mass of Stirring Bodies in the AU Mic Debris Disk Inferred from Resolved Vertical Structure
• A statistically significant lack of debris discs in medium separation binary systems
• On the Ubiquity and Stellar Luminosity Dependence of Exocometary CO Gas: Detection around M Dwarf TWA 7
• A $75\%$ Occurrence Rate of Debris Discs around F stars in the $\beta$ Pic Moving Group
• The unexpected narrowness of eccentric debris rings: a sign of eccentricity during the protoplanetary disc phase
• Expelled grains from an unseen parent body around AU Mic
• Constraining planetesimal stirring: how sharp are debris disc edges?
• Stellar Winds and Dust Avalanches in the AU Mic Debris Disk
• A Layered Debris Disk around M Star TWA 7 in Scattered Light
• Observability of Debris Discs around M-stars
• Dancing with the Stars: Formation of the Fomalhaut triple system and its effect on the debris disks
• Characterizing the morphology of the debris disk around the low-mass star GSC~07396-00759
• Discovery of an Edge-on Circumstellar Debris Disk Around BD+45${}^{\circ }$598: a Newly Identifed Member of the $\beta$ Pictoris Moving Group
• High-resolution ALMA observations of V4046Sgr: a circumbinary disc with a thin ring
• The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group
• Herschel Observations of Disks around Late-type Stars
• ALMA imaging of the M-dwarf Fomalhaut C's debris disc
• Four new PLanetesimals Around TYpical and Pre-main seqUence Stars (PLATYPUS) Debris Discs at 8.8mm

Cited by in corpus (1)

• Project Hephaistos - II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE