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arXiv · 2308.07165

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
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Abstract

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. In this study, we 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 $\lambda = (-1 \pm 11)^\circ$, supporting the theory of quiescent migration through the disk.

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Jan-Vincent Harre, Alexis M. S. Smith, Teruyuki Hirano, Szilárd Csizmadia, Amaury H. M. J. Triaud, David R. Anderson. 2023-08-14. The Orbit of Warm Jupiter WASP-106 b is aligned with its Star. https://doi.org/10.3847/1538-3881%2Facf46d

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