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arXiv · 1706.03708

ALMA Observations of the Young Substellar Binary System 2M1207

L. Ricci·P. Cazzoletti·I. Czekala·S. Andrews·D. Wilner·L. Szucs·G. Lodato·L. Testi·I. Pascucci·S. Mohanty·D. Apai·J. Carpenter·B. Bowler
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Abstract

We present ALMA observations of the 2M1207 system, a young binary made of a brown dwarf with a planetary-mass companion at a projected separation of about 40 au. We detect emission from dust continuum at 0.89 mm and from the $J = 3 - 2$ rotational transition of CO from a very compact disk around the young brown dwarf. The small radius found for this brown dwarf disk may be due to truncation from the tidal interaction with the planetary-mass companion. Under the assumption of optically thin dust emission, we estimated a dust mass of 0.1 $M_{\oplus}$ for the 2M1207A disk, and a 3$σ$ upper limit of $\sim 1~M_{\rm{Moon}}$ for dust surrounding 2M1207b, which is the tightest upper limit obtained so far for the mass of dust particles surrounding a young planetary-mass companion. We discuss the impact of this and other non-detections of young planetary-mass companions for models of planet formation, which predict the presence of circum-planetary material surrounding these objects.

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L. Ricci, P. Cazzoletti, I. Czekala, S. Andrews, D. Wilner, L. Szucs, G. Lodato, L. Testi, I. Pascucci, S. Mohanty, D. Apai, J. Carpenter, B. Bowler. 2017-06-12. ALMA Observations of the Young Substellar Binary System 2M1207. https://doi.org/10.3847/1538-3881%2Faa78a0

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