ALMA’s view of the M-dwarf GSC 07396-00759’s edge-on debris disc: AU Mic’s coeval twin-Reference-Cited by-同舟云学术

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

Published:2022-02-28 Issue:4 Volume:512 Page:4752-4764
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Cronin-Coltsmann Patrick F¹²^ORCID,Kennedy Grant M¹²^ORCID,Adam Christian³,Kral Quentin⁴^ORCID,Lestrade Jean-François⁵,Marino Sebastian⁶⁷^ORCID,Matrà Luca⁸⁹,Murphy Simon J¹⁰^ORCID,Olofsson Johan¹¹¹²^ORCID,Wyatt Mark C⁷^ORCID

Affiliation:

1. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK

2. Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK

3. Centro de Astronomía (CITEVA), Universidad de Antofagasta, Avenida U. de Antofagasta 02800, Antofagasta, Chile

4. LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France

5. LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75014 Paris, France

6. Jesus College, University of Cambridge, Jesus Lane, Cambridge CB5 8BL, UK

7. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 OHA, UK

8. Centre for Astronomy, School of Physics, National University of Ireland Galway, University Road, H91 TK33, Galway, Ireland

9. School of Physics, Trinity College Dublin, the University of Dublin, College Green, Dublin 2, D02 K8N4, Ireland

10. School of Science, The University of New South Wales, Canberra, ACT 2600, Australia

11. Instituto de Física y Astronomía, Facultad de Ciecias, Universidad de Valparaíso, Av. Gran Bretaña 1111 Playa Ancha, Valparaíso, Chile

12. Núcleo Milenio Formación Planetaria - NPF, Universidad de Valparaíso, Av. Gran Bretaña 1111, Chile

Abstract

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 β 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 multiwavelength 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 full width at half-maximum 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.

Funder

University of Warwick

ANID

NSF

NINS

NRC

KASI

ESO

NAOJ

DPAC

Publisher

Oxford University Press (OUP)