An Aligned Orbit for the Young Planet V1298 Tau b
Marshall C. Johnson, Trevor J. David, Erik A. Petigura, Howard T., Isaacson, Judah Van Zandt, Ilya Ilyin, Klaus Strassmeier, Matthias Mallonn,, George Zhou, Andrew W. Mann, John H. Livingston, Rodrigo Luger, Fei Dai,, Lauren M. Weiss, Teo Mo\v{c}nik, Steven Giacalone

TL;DR
This study measures the orbital alignment of the young exoplanet V1298 Tau b, revealing it is well-aligned with its star's rotation, providing insights into the early dynamical history of planetary systems.
Contribution
First measurement of the orbital obliquity of a young exoplanet V1298 Tau b, showing it is well-aligned, and deriving the relationship between mutual inclination and obliquity for two planets.
Findings
V1298 Tau b has a prograde, well-aligned orbit with λ ≈ 4°.
The orbit is aligned in 3D with ψ ≈ 8°.
Mutual inclination between V1298 Tau b and c is approximately 0° ± 19°.
Abstract
The alignment of planetary orbits with respect to the stellar rotation preserves information on their dynamical histories. Measuring this angle for young planets help illuminate the mechanisms that create misaligned orbits for older planets, as different processes could operate over timescales ranging from a few Myr to a Gyr. We present spectroscopic transit observations of the young exoplanet V1298 Tau b; we update the age of V1298 Tau to be Myr based on Gaia EDR3 measurements. We observed a partial transit with Keck/HIRES and LBT/PEPSI, and detected the radial velocity anomaly due to the Rossiter-McLaughlin effect. V1298 Tau~b has a prograde, well-aligned orbit, with . By combining the spectroscopically-measured and the phtometrically-measured rotation period of the host star we also find that the orbit is aligned in 3D, $\psi =…
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