NOAO >   Observing Info >   Approved Programs >   2009B-0229

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Proposal Information for 2009B-0229


PI: Peter Allen, Pennsylvania State University, pallen@astro.psu.edu
Address: Astronomy Department, 525 Davey Lab, University Park, PA 16802, USA

CoI: Laird Close, University of Arizona

Title: Wide Ultracool Companions to Spectroscopic Binaries: Testing Star Formation Simulations

Abstract: The wide brown dwarf companion rate of spectroscopic binaries is predicted by certain star formation simulations to be considerably higher than that of single stars (>10% versus 1-2%). We will test this hypothesis in a robust, statistically significant manner by measuring the wide brown dwarf binary rate of a large, volume-limited sample of 120 known spectroscopic binaries within 30 pc of the Sun. The primary measurement will be made through a common proper motion search with 2MASS serving as the first epoch and the proposed observations as the second epoch. These observations will also serve as a first epoch for very faint companions not detected in 2MASS. This work has identified previously unknown nearby cool dwarfs, which are excellent targets for detailed follow-up observations. This is a resubmission of two previous proposals (07A/B-0225), which found or confirmed 5 new M dwarf companions out of 77 fields observed, and the proposed observations will finish the northern sample.


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NOAO >   Observing Info >   Approved Programs >   2009B-0229

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