2023MNRAS.526.5401C -
Mon. Not. R. Astron. Soc., 526, 5401-5417 (2023/December-3)
An ALMA Survey of M-dwarfs in the Beta Pictoris Moving Group with two new debris disc detections.
CRONIN-COLTSMANN P.F., KENNEDY G.M., KRAL Q., LESTRADE J.-F., MARINO S., MATRA L. and WYATT M.C.
Abstract (from CDS):
Previous surveys in the far-infrared have found very few, if any, M-dwarf debris discs among their samples. It has been questioned whether M-dwarf discs are simply less common than earlier types, or whether the low detection rate derives from the wavelengths and sensitivities available to those studies. The highly sensitive, long-wavelength Atacama Large Millimetre/submillimetre Array (ALMA) can shed light on the problem. This paper presents a survey of M-dwarf stars in the young and nearby Beta Pictoris Moving Group with ALMA at Band 7 (880 μm). From the observational sample, we detect two new sub-mm excesses that likely constitute unresolved debris discs around GJ 2006 A and AT Mic A and model distributions of the disc fractional luminosities and temperatures. From the science sample of 36 M-dwarfs including AU Mic, we find a disc detection rate of 4/36 or 11.1$^{+7.4}_{-3.3}$ per cent that rises to 23.1$^{+8.3}_{-5.5}$ per cent when adjusted for completeness. We conclude that this detection rate is consistent with the detection rate of discs around G- and K-type stars and that the disc properties are also likely consistent with earlier type stars. We additionally conclude that M-dwarf stars are not less likely to host debris discs, but instead their detection requires longer wavelength and higher sensitivity observations than have previously been employed.
Abstract Copyright:
© The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society.
Journal keyword(s):
circumstellar matter - stars: individual: GJ 2006A and AT Mic - submillimetre: planetary systems
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