TY - JOUR
T1 - The Aligned orbit of WASP-148b, the only known hot Jupiter with a nearby warm Jupiter companion, from NEID and HIRES
AU - Wang, Xian-Yu
AU - Rice, Malena
AU - Wang, Songhu
AU - Pu, Bonan
AU - Stefánsson, Gudmundur
AU - Mahadevan, Suvrath
AU - Radzom, Brandon
AU - Giacalone, Steven
AU - Wu, Zhen-Yu
AU - Esposito, Thomas M.
AU - Dalba, Paul A.
AU - Avsar, Arin
AU - Holden, Bradford
AU - Skiff, Brian
AU - Polakis, Tom
AU - Voeller, Kevin
AU - Logsdon, Sarah E.
AU - Klusmeyer, Jessica
AU - Schweiker, Heidi
AU - Wu, Dong-Hong
AU - Beard, Corey
AU - Dai, Fei
AU - Lubin, Jack
AU - Weiss, Lauren M.
AU - Bender, Chad F.
AU - Blake, Cullen H.
AU - Dressing, Courtney D.
AU - Halverson, Samuel
AU - Hearty, Fred
AU - Howard, Andrew W.
AU - Huber, Daniel
AU - Isaacson, Howard
AU - Jackman, James A. G.
AU - Llama, Joe
AU - McElwain, Michael W.
AU - Rajagopal, Jayadev
AU - Roy, Arpita
AU - Robertson, Paul
AU - Schwab, Christian
AU - Shkolnik, Evgenya L.
AU - Wright, Jason T.
AU - Laughlin, Gregory
N1 - Copyright © 2022. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2022/2/1
Y1 - 2022/2/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85126060958
U2 - 10.3847/2041-8213/ac4f44
DO - 10.3847/2041-8213/ac4f44
M3 - Article
AN - SCOPUS:85126060958
SN - 2041-8205
VL - 926
SP - 1
EP - 10
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
IS - 2
M1 - L8
ER -