2015ApJ...805L..17B -
Astrophys. J., 805, L17 (2015/June-1)
An ALMA constraint on the GSC 6214-210 B circum-substellar accretion disk mass.
BOWLER B.P., ANDREWS S.M., KRAUS A.L., IRELAND M.J., HERCZEG G., RICCI L., CARPENTER J. and BROWN M.E.
Abstract (from CDS):
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of GSC 6214-210 A and B, a solar-mass member of the 5-10 Myr Upper Scorpius association with a 15±2 MJup companion orbiting at ≈ 330 AU (2".2). Previous photometry and spectroscopy spanning 0.3-5 µm revealed optical and thermal excess as well as strong Hα and Pa β emission originating from a circum-substellar accretion disk around GSC 6214-210 B, making it the lowest-mass companion with unambiguous evidence of a subdisk. Despite ALMA's unprecedented sensitivity and angular resolution, neither component was detected in our 880 µm (341 GHz) continuum observations down to a 3σ limit of 0.22 mJy/beam. The corresponding constraints on the dust mass and total mass are <0.15 M⊕and <0.05 MJup, respectively, or <0.003% and <0.3% of the mass of GSC 6214-210 B itself assuming a 100:1 gas-to-dust ratio and characteristic dust temperature of 10-20 K. If the host star possesses a putative circum-stellar disk then at most it is a meager 0.0015% of the primary mass, implying that giant planet formation has certainly ceased in this system. Considering these limits and its current accretion rate, GSC 6214-210 B appears to be at the end stages of assembly and is not expected to gain any appreciable mass over the next few megayears.
Abstract Copyright:
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Journal keyword(s):
accretion, accretion disks - brown dwarfs - stars: individual: GSC 6214-210
Simbad objects:
14
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