Kavli Affiliate: David Charbonneau
| First 5 Authors: Patrick Tamburo, Samuel W. Yee, Juliana García-Mejía, Gudmundur Stefánsson, David Charbonneau
| Summary:
We measure the true obliquity of TOI-2364, a K dwarf with a sub-Saturn-mass
($M_p = 0.18,M_J$) transiting planet on the upper edge of the hot Neptune
desert. We used new Rossiter-McLaughlin observations gathered with the Keck
Planet Finder to measure the sky-projected obliquity $lambda =
7$$^circ$$^{+10^circ}_{-11^circ}$. Combined with a stellar rotation period
of $23.47pm0.29$ days measured with photometry from the Tierras Observatory,
this yields a stellar inclination of $90^{circ} pm 13^{circ}$ and a true
obliquity $psi = 15.6$$^circ$$^{+7.7^circ}_{-7.3^circ}$, indicating that
the planet’s orbit is well aligned with the rotation axis of its host star. The
determination of $psi$ is important for investigating a potential bimodality
in the orbits of short-period sub-Saturns around cool stars, which tend to be
either aligned with or perpendicular to their host stars’ spin axes.
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