870 Micron Dust Continuum of the Youngest Protostars in Ophiuchus

Abstract

We present a 0.15${}^{\prime \prime }$ resolution (21 au) ALMA 870 $\mu$m 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 a mean mass of 2.8${}_{-1.3}^{+2.1}$ and 2.5${}_{-1.1}^{+9.2}$ M${}_{\oplus }$ and a 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 (MF) and companion star fraction (CSF) of the combined Class I and Flats based solely on this work is 0.25 $\pm$ 0.09 and 0.33 $\pm$ 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 there are some differences in the conditions for star formation in Ophiuchus that strongly affects disk size (and consequently disk mass), but does not affect system multiplicity, which could imply important variation in planet formation processes.

13 pages, 7 figures, 3 tables. Accepted to ApJ. Corrected typos

References in corpus (6)

• Theory of Star Formation
• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. A Statistical Characterization of Class 0 and I Protostellar Disks
• Dust masses of young disks: constraining the initial solid reservoir for planet formation
• The Evolution of the Multiplicity of Embedded Protostars II: Binary Separation Distribution & Analysis
• Protoplanetary Disks in $\rho$ Ophiuchus as Seen From ALMA
• The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Disk Dust Mass Distributions across Protostellar Evolutionary Classes

Cited by in corpus (8)

• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars V. A Characterization of Protostellar Multiplicity
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• The factors that influence protostellar multiplicity I: Gas temperature, density, and mass in Perseus with Nobeyama
• The Disk Population in a Distant Massive Protocluster
• The factors that influence protostellar multiplicity II. Gas temperature and mass in Perseus with APEX
• Research on the Interstellar Medium and Star Formation in the Galaxy: An Indian Perspective
• Effects of magnetic field orientations in dense cores on gas kinematics in protostellar envelopes