# Spin–Orbit Alignment of the β Pictoris Planetary System

@article{Kraus2020SpinOrbitAO,
title={Spin–Orbit Alignment of the $\beta$ Pictoris Planetary System},
author={Stefan Kraus and Jean-Baptiste Le Bouquin and Alexander Kreplin and Claire L. Davies and Edward Hone and John D. Monnier and Tyler Gardner and Grant M. Kennedy and Sasha Hinkley},
journal={arXiv: Earth and Planetary Astrophysics},
year={2020}
}
• Published 18 June 2020
• Physics, Geology
• arXiv: Earth and Planetary Astrophysics
A crucial diagnostic that can tell us about processes involved in the formation and dynamical evolutionof planetary systems is the angle between the rotation axis of a star and a planet's orbital angular momentum vector ("spin-orbit" alignment or "obliquity"). Here we present the first spin-orbit alignment measurement for a wide-separation exoplanetary system, namely on the directly-imaged planet $\beta$ Pictoris b. We use VLTI/GRAVITY spectro-interferometry with an astrometric accuracy of 1…

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