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Progress report on the BEBOP search for circumbinary planets with radial velocities

Published online by Cambridge University Press:  16 October 2024

Thomas A. Baycroft Open the ORCID record for Thomas A. Baycroft [Opens in a new window] ,
Amaury H. M. J. Triaud  and
Dong Lai
Thomas A. Baycroft*
Affiliation:
University of Birmingham (UK)
Amaury H. M. J. Triaud
Affiliation:
University of Birmingham (UK)
Dong Lai
Affiliation:
Cornell University (US)
*
email: [email protected]
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Abstract

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The BEBOP (Binaries Escorted By Orbiting Planets) survey is a search for circumbinary planets using the radial velocity spectrographs HARPS and SOPHIE, currently focusing on single-lined binaries with a mass ratio < 0.3. Circumbinary systems are an important testing ground for planet formation theories as the dynamically complex influence of the binary makes planet formation and survival more difficult. Here we present the results of the survey so far including: confirmed planets such as BEBOP-1c the first circumbinary planet detected in radial velocity; the status of our observations; and preliminary occurrence rates. We compare the early results of the radial velocity survey to the population of circumbinary planets discovered in transit, and suggest that there may be a population of inflated planets close to the inner binary which are detectable in transit but more difficult in radial velocity. Using time-lag tidal theory, we show that this inflation is unlikely caused by tides.

Keywords

Circumbinary planetsEclipsing binariesocurrence ratestidal interactions
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S382: Complex Planetary Systems II: Latest Methods for an Interdisciplinary Approach , December 2022 , pp. 51 - 58
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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