The BEBOP radial-velocity survey for circumbinary planets
I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets★,★★
Observatoire Astronomique de l’Université de Genève,
Chemin des Maillettes 51,
1290 Sauverny, Switzerland
2 Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
3 School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
4 Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
5 SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, KY16 9SS St Andrews, Fife, UK
6 Department of Physics, University of Warwick, Coventry CV4 7AL, UK
Accepted: 8 January 2019
We introduce the BEBOP radial velocity survey for circumbinary planets. We initiated this survey using the CORALIE spectrograph on the Swiss Euler Telescope at La Silla, Chile. An intensive four-year observation campaign commenced in 2013, targeting 47 single-lined eclipsing binaries drawn from the EBLM survey for low mass eclipsing binaries. Our specific use of binaries with faint M dwarf companions avoids spectral contamination, providing observing conditions akin to single stars. By combining new BEBOP observations with existing ones from the EBLM programme, we report on the results of 1519 radial velocity measurements over timespans as long as eight years. For the best targets we are sensitive to planets down to 0.1 MJup, and our median sensitivity is 0.4 MJup. In this initial survey we do not detect any planetary mass companions. Nonetheless, we present the first constraints on the abundance of circumbinary companions, as a function of mass and period. A comparison of our results to Kepler’s detections indicates a dispersion of planetary orbital inclinations less than ~10°.
Key words: binaries: eclipsing / planets and satellites: detection / techniques: radial velocities / techniques: photometric / stars: statistics / stars: low-mass
Based on photometric observations with the SuperWASP and SuperWASP-South instruments and radial velocity measurement from the CORALIE spectrograph, mounted on the Swiss 1.2 m Euler Telescope, located at ESO, La Silla, Chile.
The radial velocities are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/624/A68, and on request to the main author.
© ESO 2019