Binaries Among Debris Disk Stars

Details Binaries Among Debris Disk Stars Binaries Among Debris Disk Stars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934414r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #344.14

Physics

Optics

Scientific paper

We have gathered a sample of 112 main-sequence stars with known debris disks. We collected published information and performed adaptive optics observations at Lick Observatory to determine if these debris disks are associated with binary or multiple stars. We discover a previously unknown M-star companion to HIP 1185 at a projected separation of 628 AU. We find that 25% of our debris disk systems are binary or triple star systems, substantially less than the expected 50%. The period distribution for these suggests a relative lack of systems with 1-100 AU separations. Only a few systems have blackbody disk sizes comparable to the binary/triple separation. Together, these two characteristics suggest that binaries with intermediate separations of 1-100 AU readily clear out their disks. We find that the fractional disk luminosity, as a proxy for disk mass, is generally lower for multiple systems than for single stars at any given age. Hence, for a binary to possess a disk or form planets it must either be a very widely separated binary with disk particles orbiting a single star or it must be a small separation binary with a circumbinary disk.
This research was supported in part by NASA grants to UCLA.

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