TY - JOUR
T1 - Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus
AU - Kuruwita, Rajika L.
AU - Ireland, Michael
AU - Rizzuto, Aaron
AU - Bento, Joao
AU - Federrath, Christoph
N1 - Publisher Copyright:
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2018/11/1
Y1 - 2018/11/1
N2 - 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 ${sim }5hbox{ - }20, mathrm{Myr}$. 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 ${sim }0.12{+0.02}-{-0.01}$. 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.
AB - 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 ${sim }5hbox{ - }20, mathrm{Myr}$. 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 ${sim }0.12{+0.02}-{-0.01}$. 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.
KW - binaries: spectroscopic
KW - protoplanetary discs
KW - stars: formation
KW - stars: pre-main-sequence
KW - techniques: radial velocities
UR - http://www.scopus.com/inward/record.url?scp=85102136463&partnerID=8YFLogxK
U2 - 10.1093/mnras/sty2108
DO - 10.1093/mnras/sty2108
M3 - Article
SN - 0035-8711
VL - 480
SP - 5099
EP - 5112
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -