Protoplanetary Disks in ρ Ophiuchus as Seen from ALMA

Erin G. Cox, Robert J. Harris, Leslie W. Looney, Hsin Fang Chiang, Claire Chandler, Kaitlin Kratter, Zhi Yun Li, Laura Perez, John J. Tobin

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


We present a high angular resolution (∼ 0.″ 2), high-sensitivity (σ ∼ 0.2 mJy) survey of the 870 μm continuum emission from the circumstellar material around 49 pre-main-sequence stars in the ρ Ophiuchus molecular cloud. Because most millimeter instruments have resided in the northern hemisphere, this represents the largest highresolution, millimeter-wave survey of the circumstellar disk content of this cloud. Our survey of 49 systems comprises 63 stars; we detect disks associated with 29 single sources, 11 binaries, 3 triple systems, and 4 transition disks. We present flux and radius distributions for these systems; in particular, this is the first presentation of a reasonably complete probability distribution of disk radii at millimeter wavelengths. We also compare the flux distribution of these protoplanetary disks with that of the disk population of the Taurus-Auriga molecular cloud. We find that disks in binaries are both significantly smaller and have much less flux than their counterparts around isolated stars. We compute truncation calculations on our binary sources and find that these disks are too small to have been affected by tidal truncation and posit some explanations for this. Lastly, our survey found three candidate gapped disks, one of which is a newly identified transition disk with no signature of a dip in infrared excess in extant observations.

Original languageEnglish (US)
Article number83
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 20 2017


  • protoplanetary disks
  • stars: formation
  • stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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