Stellar Spin-Orbit Misalignment in a Multiplanet System
Abstract
Stars hosting hot Jupiters are often observed to have high obliquities, whereas stars with multiple co-planar planets have been seen to have low obliquities. This has been interpreted as evidence that hot-Jupiter formation is linked to dynamical disruption, as opposed to planet migration through a protoplanetary disk. We used asteroseismology to measure a large obliquity for Kepler-56, a red giant star hosting two transiting co-planar planets. These observations show that spin-orbit misalignments are not confined to hot-Jupiter systems. Misalignments in a broader class of systems had been predicted as a consequence of torques from wide-orbiting companions, and indeed radial-velocity measurements revealed a third companion in a wide orbit in the Kepler-56 system.
Cite
@article{arxiv.1310.4503,
title = {Stellar Spin-Orbit Misalignment in a Multiplanet System},
author = {Daniel Huber and Joshua A. Carter and Mauro Barbieri and Andrea Miglio and Katherine M. Deck and Daniel C. Fabrycky and Benjamin T. Montet and Lars A. Buchhave and William J. Chaplin and Saskia Hekker and Josefina Montalbán and Roberto Sanchis-Ojeda and Sarbani Basu and Timothy R. Bedding and Tiago L. Campante and Joergen Christensen-Dalsgaard and Yvonne P. Elsworth and Dennis Stello and Torben Arentoft and Eric B. Ford and Ronald L. Gilliland and Rasmus Handberg and Andrew W. Howard and Howard Isaacson and John Asher Johnson and Christoffer Karoff and Steven D. Kawaler and Hans Kjeldsen and David W. Latham and Mikkel N. Lund and Mia Lundkvist and Geoffrey W. Marcy and Travis S. Metcalfe and Victor Silva Aguirre and Joshua N. Winn},
journal= {arXiv preprint arXiv:1310.4503},
year = {2013}
}
Comments
Accepted for publication in Science, published online on October 17 2013; PDF includes main article and supplementary materials (65 pages, 27 figures, 7 tables); v2: small correction to author list