A Resolved Census of Millimeter Emission from Taurus Multiple Star Systems

Abstract

We present a high angular resolution millimeter-wave dust continuum imaging survey of circumstellar material associated with individual components of 23 multiple star systems in the Taurus-Auriga young cluster. Combined with previous measurements, these new data permit a comprehensive look at how millimeter luminosity (a tracer of disk mass) relates to the separation and mass of a stellar companion. Approximately one third (28-37%) of individual stars in multiples have detectable millimeter emission, a rate half that for single stars (~62%). There is a strong correlation between the luminosity and projected separation (a_p) of a stellar pair. Wide pairs (a_p > 300 AU) have a similar luminosity distribution as single stars, medium pairs (a_p ~ 30-300 AU) are a factor of 5 fainter, and close pairs (a_p < 30 AU) are ~ 5 times fainter yet (aside from a small population of bright circumbinary disks). In most cases, the emission is dominated by a disk around the primary (or a wide tertiary in triples), but there is no clear relationship between luminosity and stellar mass ratio. A direct comparison of resolved disk sizes with predictions from tidal truncation models yields mixed results; some disks are larger than expected given their companion separations. We suggest that the presence of a stellar companion impacts disk properties at a level comparable to the internal evolution mechanisms operating in isolated systems, with both the multiple star formation process itself and star-disk tidal interactions likely playing important roles in the evolution of disk material. From the perspective of the mass content of the disk, we expect that (giant) planet formation is inhibited around the components of close pairs or secondaries, but should be as likely as for single stars around the primaries (or wide tertiaries in hierarchical triples) in more widely-separated multiple star systems.

Accepted for publication in ApJ. 40 pages, 11 figures, 9 tables

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