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Obliquity measurements for stars hosting relatively long-period giant planetswith weak star-planet tidal interactions may play a key role in distinguishingbetween formation theories for shorter-period hot Jupiters. Few such obliquitymeasurements have been made to date due to the relatively small sample of knownwide-orbiting, transiting Jovian-mass planets and the challenging nature ofthese targets, which tend to have long transit durations and orbit faint stars.We report a measurement of the Rossiter-McLaughlin effect across the transit ofK2-140 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$\lambda=0.5\pm9.7$ degrees, suggesting a dynamically cool formation history.This observation builds towards a population of tidally detached giant planetspin-orbit angles that will enable a direct comparison with the distribution ofclose-orbiting hot Jupiter orbital configurations, elucidating the prevalentformation mechanisms of each group.

Stellar Obliquities in Long-period Exoplanet Systems (SOLES) I: The Spin-Orbit Alignment of K2-140 b