870 μm Dust Continuum of the Youngest Protostars in Ophiuchus

Frankie J. Encalada*, Leslie W. Looney, John J. Tobin, Sarah I. Sadavoy, Dominique Segura-Cox, Erin Cox, Zhi Yun Li, Giles Novak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present a 0.″15 resolution (21 au) ALMA 870 μm continuum survey of 25 pointings containing 31 young stellar objects in the Ophiuchus molecular clouds. Using the dust continuum as a proxy for dust mass and circumstellar disk radius in our sample, we report mean masses of and -1.1 +9.2 M ⊕ and mean radii of 23.5_-1.2 +1.8 and 16.5_-0.9 +2.8 au, for Class I and Flat spectrum protostars, respectively. In addition, we calculate the multiplicity statistics of the dust surrounding young stellar objects in Ophiuchus. The multiplicity fraction and companion star fraction of the combined Class I and Flats based solely on this work are 0.25 0.09 and 0.33 0.10, respectively, which are consistent with the values for Perseus and Orion. While we see clear differences in mass and radius between the Ophiuchus and Perseus/Orion protostellar surveys, we do not see any significant differences in the multiplicities of the various regions. We posit that there are some differences in the conditions for star formation in Ophiuchus that strongly affect disk size (and consequently disk mass), but does not affect system multiplicity, which could imply important variation in planet formation processes.

Original languageEnglish (US)
Article number149
JournalAstrophysical Journal
Volume913
Issue number2
DOIs
StatePublished - Jun 1 2021
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of '870 μm Dust Continuum of the Youngest Protostars in Ophiuchus'. Together they form a unique fingerprint.

Cite this