An ALMA Constraint on the GSC 6214-210 B Circum-substellar Accretion Disk Mass

Brendan P. Bowler, Sean M. Andrews, Adam L. Kraus, Michael J. Ireland, Gregory Herczeg, Luca Ricci, John Carpenter, Michael E. Brown

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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 H 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.

Original languageEnglish
Article numberL17
Pages (from-to)1-5
Number of pages5
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 1 Jun 2015
Externally publishedYes


  • accretion, accretion disks
  • brown dwarfs
  • stars: individual (GSC 6214-210)


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