PRIMORDIAL CIRCUMSTELLAR DISKS IN BINARY SYSTEMS: EVIDENCE FOR REDUCED LIFETIMES

被引:136
作者
Cieza, Lucas A. [1 ]
Padgett, Deborah L. [2 ]
Allen, Lori E. [3 ]
McCabe, Caer E. [2 ]
Brooke, Timothy Y. [2 ]
Carey, Sean J. [2 ]
Chapman, Nicholas L. [4 ]
Fukagawa, Misato [5 ]
Huard, Tracy L. [6 ]
Noriga-Crespo, Alberto [2 ]
Peterson, Dawn E. [3 ]
Rebull, Luisa M. [2 ]
机构
[1] Univ Hawaii Manoa, Inst Astron, Honolulu, HI 96822 USA
[2] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[4] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[5] Osaka Univ, Osaka 5600043, Japan
[6] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
来源
ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 696卷 / 01期
关键词
binaries: general; circumstellar matter; infrared: stars; planetary systems: protoplanetary disks; stars: pre-main sequence; T-TAURI STARS; GIANT PLANET FORMATION; SPITZER C2D SURVEY; FORMING REGIONS; YOUNG STARS; PROTOPLANETARY DISKS; CORONAE-AUSTRALIS; IMAGING SURVEY; CHAMELEON-I; MULTIPLICITY;
D O I
10.1088/0004-637X/696/1/L84
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 similar to 2.4e-5, according to the K-S test for binaries with separations less than 400AU) from that of systems lacking evidence for a disk. As expected, systems with projected separations less than 40AU 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 similar to 1AU). 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.
引用
收藏
页码:L84 / L88
页数:5
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