SOLES I: The Spin–Orbit Alignment of K2-140 b
- 7 October 2021
- journal article
- research article
- Published by American Astronomical Society in The Astronomical Journal
- Vol. 162 (5), 182
- https://doi.org/10.3847/1538-3881/ac1f8f
Abstract
Obliquity measurements for stars hosting relatively long-period giant planets with weak star-planet tidal interactions may play a key role in distinguishing between formation theories for shorter-period hot Jupiters. Few such obliquity measurements have been made to date due to the relatively small sample of known wide-orbiting, transiting Jovian-mass planets and the challenging nature of these targets, which tend to have long transit durations and orbit faint stars. We report a measurement of the Rossiter-McLaughlin effect across the transit of K2-140 b, a Jupiter-mass planet with period P = 6.57 days orbiting a V = 12.6 star. We find that K2-140 is an aligned system with projected spin-orbit angle lambda = 0.5 degrees +/- 9.7 degrees, suggesting a dynamically cool formation history. This observation builds toward a population of tidally detached giant planet spin-orbit angles that will enable a direct comparison with the distribution of close-orbiting hot-Jupiter orbital configurations, elucidating the prevalent formation mechanisms of each group.Keywords
Funding Information
- National Science Foundation (DGE-1752134)
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