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 ~5-20Myr. 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 2.3m 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 20yr 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.

Cone search capability for table J/MNRAS/480/5099/table1 (RV standards used as templates to obtain radial velocities of our observed targets)

Cone search capability for table J/MNRAS/480/5099/tablea1 (Magnitudes of our targets)

Cone search capability for table J/MNRAS/480/5099/tablea3 (Full list of objects observed in this survey with each epoch of data)