HATS-18b: An Extreme Short-period Massive Transiting Planet Spinning Up Its Star
Article
Article Title | HATS-18b: An Extreme Short-period Massive Transiting Planet Spinning Up Its Star |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Penev, K. (Author), Hartman, J. D. (Author), Bakos, G. A. (Author), Ciceri, S. (Author), Brahm, R. (Author), Bayliss, D. (Author), Bento, J. (Author), Jordan, A. (Author), Csubry, Z. (Author), Bhatti, W. (Author), de Val-Borro, M. (Author), Espinoza, N. (Author), Zhou, G. (Author), Mancini, L. (Author), Rabus, M. (Author), Suc, V. (Author), Henning, T. (Author), Schmidt, B. (Author), Noyes, R. W. (Author), Lazar, J. (Author), Papp, I. (Author) and Sari, P. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 152 (5), pp. 1-11 |
Article Number | 127 |
Number of Pages | 11 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-6256/152/5/127 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-6256/152/5/127 |
Abstract | We report the discovery by the HATSouth network of HATS-18b: a 1.980 ± 0.077 MJ, - 1.337-0.049 +0.102 RJ planet in a 0.8378 day orbit, around a solar analog star (mass 1.037 ± 0.047 M⊙ and radius - 1.020-0.031 +0.057 R⊙) with V=14.067±0.040 mag. The high planet mass, combined with its short orbital period, implies strong tidal coupling between the planetary orbit and the star. In fact, given its inferred age, HATS-18 shows evidence of significant tidal spin up, which together with WASP-19 (a very similar system) allows us to constrain the tidal quality factor for Sun-like stars to be in the range of 6.5≲log10(Q∗/k2)≲7 even after allowing for extremely pessimistic model uncertainties. In addition, the HATS-18 system is among the best systems (and often the best system) for testing a multitude of star-planet interactions, be they gravitational, magnetic, or radiative, as well as planet formation and migration theories. |
Keywords | planetary systems; planets and satellites: detection; planets and satellites: gaseous planets; stars: individual: HATS-18; stars: rotation; techniques: photometric; Astrophysics - Earth and Planetary; Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Princeton University, United States |
Max Planck Society, Germany | |
Pontifical Catholic University of Chile, Chile | |
Australian National University | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Hungarian Astronomical Association, Hungary |
https://research.usq.edu.au/item/q6x5q/hats-18b-an-extreme-short-period-massive-transiting-planet-spinning-up-its-star
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