期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 480, 期 4, 页码 5099-5112出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2108
关键词
techniques: radial velocities; protoplanetary discs; binaries: spectroscopic; stars: formation; stars: pre-main-sequence
资金
- Australian Government Research Training Program Domestic Scholarship
- Australian Research Council [FT130100235, DP150104329, DP170100603]
- Australia-Germany Joint Research Co-operation Scheme (UA-DAAD)
- Gauss Centre for Supercomputing [pr32lo, pr48pi, 10391]
- Partnership for Advanced Computing in Europe (PRACE grant) [pr89mu]
- Australian National Computational Infrastructure [ek9]
- Australian Government
- Government of Western Australia
- Australian Research Council [FT130100235] Funding Source: Australian Research Council
We present observations of disc-bearing stars in Upper Scorpius (US) and Upper Centaurus-Lupus (UCL) with moderate resolution spectroscopy in order to determine the influence of multiplicity on disc persistence after similar to 5-20 Myr. Discs were identified using infrared (IR) excess from the Wide-field Infrared Survey Explorer (WISE) survey. Our survey consists of 55 US members and 28 UCL members, using spatial and kinematic information to assign a probability of membership. Spectra are gathered from the ANU 2.3 m telescope using the Wide Field Spectrograph (WiFeS) to detect radial velocity variations that indicate the presence of a companion. We identify two double-lined spectroscopic binaries, both of which have strong IR excess. We find the binary fraction of disc-bearing stars in US and UCL for periods up to 20 yr to be 0.06(-0.0)(2)(+0.07) and 0.13(-0.03)(+0.06) respectively. Based on the multiplicity of field stars, we obtain an expected binary fraction of similar to 0.12(-0.01)(+0.02). The determined binary fractions for disc-bearing stars do not vary significantly from the field, suggesting that overall lifetime of discs may not differ between single and binary star systems.
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