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J/ApJ/696/L84   Primordial circumstellar disks in binary systems  (Cieza+, 2009)

Primordial circumstellar disks in binary systems: evidence for reduced lifetimes. Cieza L.A., Padgett D.L., Allen L.E., McCabe C.E., Brooke T.Y., Carey S.J., Chapman N.L., Fukagawa M., Huard T.L., Noriga-Crespo A., Peterson D.E., Rebull L.M. <Astrophys. J., 696, L84-L88 (2009)> =2009ApJ...696L..84C
ADC_Keywords: Molecular clouds ; Stars, pre-main sequence ; Photometry, infrared ; Surveys ; Stars, double and multiple Keywords: binaries: general - circumstellar matter - infrared: stars - planetary systems: protoplanetary disks - stars: pre-main sequence Abstract: 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 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 40-400AU range. These results represent the first statistically significant evidence for a correlation between binary separation and the presence of an inner disk (r∼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. Description: We collected projected binary separations from near-IR multiplicity surveys of PMS stars located in the following nearby (d<160pc) star-forming regions: Ophiuchus (Simon et al. 1995ApJ...443..625S; Prato 2007ApJ...657..338P; Ratzka et al. 2005A&A...437..611R), Taurus (Leinert et al. 1993A&A...278..129L; Simon et al. 1995ApJ...443..625S; Kohler & Leinert 1998A&A...331..977K), Chameleon I (Lafreniere et al. 2008ApJ...683..844L), and Corona Australis (Kohler et al. 2008A&A...488..997K). Most of the surveys were performed using speckle imaging. Using their Two Micron All Sky Survey coordinates and a 2" matching radius, we searched for the Spitzer fluxes of all the targets from the surveys discussed above in the catalogs produced by the Cores to Disks (Evans et al. 2003PASP..115..965E), Taurus (Padgett et al. 2006AAS...209.3016P), and Gould Belt (Allen et al. 2007AAS...211.8919A) Legacy Projects. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 125 349 Multiplicity and Spitzer data
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/A+A/515/A75 : Low-mass population in ρ Oph cloud (Alves de Oliveira+, 2010) J/PASJ/60/209 : Faint companions around YSOs in TMC (Itoh+, 2008) J/ApJ/684/654 : Low-mass members of Chamaeleon I (Luhman+, 2008) J/ApJ/675/1375 : IRAC/MIPS photometry in Cha I (Luhman+, 2008) J/A+A/488/987 : Near-infrared survey of R CrA cloud (Haas+, 2008) J/A+A/446/485 : New very low-mass members in Taurus (Guieu+, 2006) J/A+A/452/245 : Near-IR photometry of PMS stars in rho Oph (Natta+, 2006) J/ApJ/647/1180 : Infrared photometry of Taurus SFR (Luhman+, 2006) J/ApJ/630/381 : Mid-IR imaging in ρ Oph (Barsony+, 2005) J/AJ/121/2673 : 3µm survey of the Chamaeleon I dark cloud (Kenyon+, 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Object Name 18- 25 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000) 27- 34 F8.4 deg DEdeg Declination in decimal degrees (J2000) 36- 40 A5 --- Region Star-forming region (Cha_I, CrA, Oph or Tau) 42- 47 F6.3 arcsec Sep ? Angular separation (if binary) 49- 53 A5 --- Ref Reference for multiplicity survey (1) 55- 62 E8.2 mJy F3.6um Spitzer/IRAC 3.6 micron flux 64- 71 E8.2 mJy e_F3.6um Error in 3.6 micron flux 73- 80 E8.2 mJy F4.5um Spitzer/IRAC 4.5 micron flux 82- 89 E8.2 mJy e_F4.5um Error in 4.5 micron flux 91- 98 E8.2 mJy F5.8um Spitzer/IRAC 5.8 micron flux 100-107 E8.2 mJy e_F5.8um Error in 5.8 micron flux 109-116 E8.2 mJy F8.0um Spitzer/IRAC 5.8 micron flux 118-125 E8.2 mJy e_F8.0um Error in 5.8 micron flux
Note (1): References as follows: 1 = Leinert et al. 1993A&A...278..129L 2 = Simon et al. 1995ApJ...450..824S 3 = Lafreniere et al. 2008ApJ...683..844L 4 = Prato et al. 2007ApJ...657..338P 5 = Ratzka et al. 2005A&A...437..611R 6 = Koheler et al. 2008A&A...488..997K
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-May-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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