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 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 estimate a dust mass of 0.1 M ⊕ for the 2M1207A disk and a 3 σ upper limit of ∼1 M 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 that predict circumplanetary material to surround these objects.
CITATION STYLE
Ricci, L., Cazzoletti, P., Czekala, I., Andrews, S. M., Wilner, D., Szűcs, L., … Bowler, B. P. (2017). ALMA Observations of the Young Substellar Binary System 2M1207. The Astronomical Journal, 154(1), 24. https://doi.org/10.3847/1538-3881/aa78a0
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