ALMA observations of the young substellar binary system 2M1207

L. Ricci*, P. Cazzoletti, I. Czekala, S. M. Andrews, D. Wilner, L. Szűcs, G. Lodato, L. Testi, I. Pascucci, S. Mohanty, D. Apai, J. M. Carpenter, B. P. Bowler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

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 estimate a dust mass of 0.1 M ⊕ for the 2M1207A disk and a 3σ upper limit of ∼1 MMoon 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.
Original languageEnglish
Article number24
Number of pages8
JournalAstronomical Journal
Volume154
Issue number1
Early online date27 Jun 2017
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • Circumstellar matter
  • Planets and satellites: formation
  • Stars: individual: 2M1207
  • Submillimeter: stars

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