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2018MNRAS.480.5099K - Mon. Not. R. Astron. Soc., 480, 5099-5112 (2018/November-2)

Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus.


Abstract (from CDS):

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 ∼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+0.07–0.02 and 0.13+0.06–0.03, respectively. Based on the multiplicity of field stars, we obtain an expected binary fraction of ∼0.12+0.02–0.01. 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.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: radial velocities - protoplanetary discs - binaries: spectroscopic - stars: formation - stars: pre-main-sequence

Errata: erratum vol. 487, p. 5475 (2019)

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 44

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