Cieza, Lucas A. and Padgett, Deborah L. and Allen, Lori E. and McCabe, Caer E. and Brooke, Timothy Y. and Carey, Sean J. and Chapman, Nicholas L. and Fukagawa, Misato and Huard, Tracy L. and Noriga-Crespo, Alberto and Peterson, Dawn E. and Rebull, Luisa M. (2009) Primordial circumstellar disks in binary systems: evidence for reduced lifetimes. Astrophysical Journal Letters, 696 (1). L84-L88. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090528-115758680
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We combine the results from several multiplicity surveys of pre-main-sequence stars located in four nearby star-forming regions with Spitzer data from three different Legacy Projects. This allows us to construct a sample of 349 targets, including 125 binaries, which we use to to investigate the effect of companions on the evolution of circumstellar disks. We find that the distribution of projected separations of systems with Spitzer excesses is significantly different (P ~ 2.4e-5, according to the K-S test for binaries with separations less than 400 AU) from that of systems lacking evidence for a disk. As expected, systems with projected separations less than 40 AU are half as likely to retain at least one disk than are systems with projected separations in the 40-400 AU range. These results represent the first statistically significant evidence for a correlation between binary separation and the presence of an inner disk (r~ 1 AU). Several factors (e.g., the incompleteness of the census of close binaries, the use of unresolved disk indicators, and projection effects) have previously masked this correlation in smaller samples. We discuss the implications of our findings for circumstellar disk lifetimes and the formation of planets in multiple systems.
|Additional Information:||© 2009 American Astronomical Society. Print publication: Issue 1 (2009 May 1) Received 2009 March 3; accepted for publication 2009 March 19; published 2009 April 16. We thank Jonathan Williams, Jonathan Swift, Michael Liu, and the anonymous referee for their valuable comments. Support for this work was provided by NASA through the Spitzer Fellowship Program under an award from Caltech. This work makes use of data obtained with the Spitzer Space Telescope, which is operated by JPL/Caltech, under a contract with NASA.|
|Subject Keywords:||binaries: general; circumstellar matter; infrared: stars; planetary systems: protoplanetary disks; stars: pre-main sequence|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||02 Jun 2009 17:28|
|Last Modified:||26 Dec 2012 11:02|
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