Spin–orbit alignment for KELT-7b and HAT-P-56b via Doppler tomography with TRES
Article
Article Title | Spin–orbit alignment for KELT-7b and HAT-P-56b via Doppler tomography with TRES |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Zhou, George (Author), Latham, David W. (Author), Bieryla, Allyson (Author), Beatty, Thomas G. (Author), Buchhave, Lars A. (Author), Esquerdo, Gilbert A. (Author), Berlind, Perry (Author) and Calkins, Michael L. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 460 (3), pp. 3376-3383 |
Number of Pages | 8 |
Year | 2016 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stw1107 |
Web Address (URL) | https://academic.oup.com/mnras/article/460/3/3376/2609407 |
Abstract | We present Doppler tomographic analyses for the spectroscopic transits of KELT-7b and HAT-P-56b, two hot-Jupiters orbiting rapidly rotating F-dwarf host stars. These include analyses of archival Tillinghast Reflector Echelle Spectrograph (TRES) observations for KELT-7b, and a new TRES transit observation of HAT-P-56b. We report spin-orbit aligned geometries for KELT-7b (2.7° ± 0.6°) and HAT-P-56b (8° ± 2°). The host stars KELT-7 and HAT-P-56 are among some of the most rapidly rotating planet-hosting stars known. We examine the tidal re-alignment model for the evolution of the spin-orbit angle in the context of the spin rates of these stars. We find no evidence that the rotation rates of KELT-7 and HAT-P-56 have been modified by star-planet tidal interactions, suggesting that the spin-orbit angle of systems around these hot stars may represent their primordial configuration. In fact, KELT-7 and HAT-P-56 are two of three systems in supersynchronous, spin-orbit aligned states, where the rotation periods of the host stars are faster than the orbital periods of the planets. |
Keywords | Planetary systems; Planets and satellites: individual: (KELT-7b, HAT-P-56b); Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Center for Astrophysics Harvard and Smithsonian, United States |
Harvard-Smithsonian Centre for Astrophysics, United States | |
Pennsylvania State University, United States | |
University of Copenhagen, Denmark |
https://research.usq.edu.au/item/q6x7v/spin-orbit-alignment-for-kelt-7b-and-hat-p-56b-via-doppler-tomography-with-tres
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