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We present spectroscopic measurements of the Rossiter-McLaughlin effect forWASP-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 firstscientific results reported from the newly commissioned NEID spectrograph, aswell as the second obliquity constraint for a hot Jupiter system with aclose-in companion, after WASP-47. WASP-148b is consistent with being inalignment with the sky-projected spin axis of the host star, with$\lambda=-8^{\circ}.2^{{+8^{\circ}.7}}_{-9^{\circ}.7}$. The low obliquityobserved in the WASP-148 system is consistent with the orderly-alignmentconfiguration of most compact multi-planet systems around cool stars withobliquity constraints, including our solar system, and may point to an earlyhistory for these well-organized systems in which migration and accretionoccurred in isolation, with relatively little disturbance. By contrast,previous results have indicated that high-mass and hot stars appear to morecommonly host a wide range of misaligned planets: not only single hot Jupiters,but also compact systems with multiple super-Earths. We suggest that, toaccount for the high rate of spin-orbit misalignments in both compactmulti-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.

The Aligned Orbit of WASP-148b, the Only Known Hot Jupiter with a Nearby Warm Jupiter Companion, from NEID and HIRES