Contributed Talk - Splinter Exoplanets

Thursday, 14 September 2023, 16:30   (H 3007)

The orbit of Warm Jupiter WASP-106 b is aligned with its Star

Jan-Vincent Harre, Alexis M. S. Smith, Teruyuki Hirano, Szilárd Csizmadia, Amaury H. M. J. Triaud, David R. Anderson
(JVH, AMSS, SCs) Institute of Planetary Research, German Aerospace Center; (TH) ABC; (TH) NAOJ; (TH) SOKENDAI Tokyo; (AHMJT) U Birmingham; (DRA) U Warwick

Understanding orbital obliquities, or the misalignment angles between a star’s rotation axis and the orbital axis of its planets, is crucial for unraveling the mechanisms of planetary formation and migration. Here, I will present an analysis of Rossiter-McLaughlin (RM) observations of the warm Jupiter exoplanet WASP-106 b. The high-precision radial velocity measurements were made with HARPS and HARPS-N during the transit of this planet. We aim to constrain the orientation of the planet’s orbit relative to its host star’s rotation axis. The RM observations are analyzed using a code which models the RM anomaly together with the Keplerian orbit given several parameters in combination with a Markov chain Monte Carlo implementation. We measure the projected stellar obliquity in the WASP-106 system for the first time and find λ = (−1 ± 11)°, supporting the theory of quiescent migration through the disk, and adding one more aligned warm Jupiter to the relatively small sample of 16 of these systems with measured obliquities.