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 5 - 20 \mathrm { Myr } .
Discs were identified using infra-red ( IR ) excess from the Wide-field Infra-red 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 2.3m telescope using the Wide Field Spectrograph ( WiFeS ) to detect radial velocity variations that indicate the presence of a companion .
We identify 2 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 years 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 does not vary significantly from the field , suggesting that the overall lifetime of discs may not differ between single and binary star systems .