%AWang, Xian-Yu%ARice, Malena%AWang, Songhu%APu, Bonan%AStefánsson, Gudmundur%AMahadevan, Suvrath%ARadzom, Brandon%AGiacalone, Steven%AWu, Zhen-Yu%AEsposito, Thomas%ADalba, Paul%AAvsar, Arin%AHolden, Bradford%ASkiff, Brian%APolakis, Tom%AVoeller, Kevin%ALogsdon, Sarah%AKlusmeyer, Jessica%ASchweiker, Heidi%AWu, Dong-Hong%ABeard, Corey%ADai, Fei%ALubin, Jack%AWeiss, Lauren%ABender, Chad%ABlake, Cullen%ADressing, Courtney%AHalverson, Samuel%AHearty, Fred%AHoward, Andrew%AHuber, Daniel%AIsaacson, Howard%AJackman, James%ALlama, Joe%AMcElwain, Michael%ARajagopal, Jayadev%ARoy, Arpita%ARobertson, Paul%ASchwab, Christian%AShkolnik, Evgenya%AWright, Jason%ALaughlin, Gregory%BJournal Name: The Astrophysical Journal Letters; Journal Volume: 926; Journal Issue: 2 %D2022%I %JJournal Name: The Astrophysical Journal Letters; Journal Volume: 926; Journal Issue: 2 %K %MOSTI ID: 10358430 %PMedium: X %TThe Aligned Orbit of WASP-148b, the Only Known Hot Jupiter with a nearby Warm Jupiter Companion, from NEID and HIRES %XAbstract We present spectroscopic measurements of the Rossiter–McLaughlin effect for WASP-148b, the only known hot Jupiter with a nearby warm-Jupiter companion, from the WIYN/NEID and Keck/HIRES instruments. This is one of the first scientific results reported from the newly commissioned NEID spectrograph, as well as the second obliquity constraint for a hot Jupiter system with a close-in companion, after WASP-47. WASP-148b is consistent with being in alignment with the sky-projected spin axis of the host star, with λ = − 8 .° 2 − 9 .° 7 + 8 .° 7 . The low obliquity observed in the WASP-148 system is consistent with the orderly-alignment configuration of most compact multi-planet systems around cool stars with obliquity constraints, including our solar system, and may point to an early history for these well-organized systems in which migration and accretion occurred in isolation, with relatively little disturbance. By contrast, previous results have indicated that high-mass and hot stars appear to more commonly host a wide range of misaligned planets: not only single hot Jupiters, but also compact systems with multiple super-Earths. We suggest that, to account for the high rate of spin–orbit misalignments in both compact multi-planet and isolated-hot-Jupiter systems orbiting high-mass and hot stars, spin–orbit misalignments may be caused by distant giant planet perturbers, which are most common around these stellar types. %0Journal Article