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Paper: MAESTRO-1 b: A Transiting Planet in a Close Binary?
Volume: 398, Extreme Solar Systems
Page: 113
Authors: Setiawan, J.; Weldrake, D.; Afonso, C.; Henning, Th.; Launhardt, R.; Müller, A.; Weise, P.
Abstract: We report the detection of a giant planet candidate in a close binary system. This result was obtained from the follow-up radial velocity (RV) measurements of MACHO 120.22303.5389 (MAESTRO-1), a planetary transit candidate from the MACHO project. From the stellar spectra we determined the fundamental stellar parameters and derived a primary mass of 1.36 M. The spectroscopic observations show a short-period RV variation with P1=2.43 days that is close to the period predicted by the transit, and a semi-amplitude of 0.8 kms−1. This RV variation is most likely due to a planetary companion. We derived a planetary mass of ≈ 6.52 MJ an a circular orbit with a semimajor axis of 0.039 AU. We also observed a long-period RV variation with P2 =169.5 days and a semi-amplitude of 29.5 kms−1. This RV variation is obviously due the presence of a stellar companion. The secondary star has a minimum mass of 1.27 M and an eccentric orbit with a semimajor axis of less than 1 AU. This is the first detection of a planet in a close binary system.
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