HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography
Article
Article Title | HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Zhou, G. (Author), Bakos, G. A. (Author), Hartman, J. D. (Author), Latham, D. W. (Author), Torres, G. (Author), Bhatti, W. (Author), Penev, K. (Author), Buchhave, L. (Author), Kovacs, G. (Author), Bieryla, A. (Author), Quinn, S. (Author), Isaacson, H. (Author), Fulton, B. J. (Author), Falco, E. (Author), Csubry, Z. (Author), Everett, M. (Author), Szklenar, T. (Author), Esquerdo, G. (Author), Berlind, P. (Author), Calkins, M. L. (Author), Beky, B. (Author), Knox, R. P. (Author), Hinz, P. (Author), Horch, E. P. (Author), Hirsch, L. (Author), Howell, S. B. (Author), Noyes, R. W. (Author), Marcy, G. (Author), de Val-Borro, M. (Author), Lazar, J. (Author), Papp, I. (Author) and Sari, P. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 153 (5), pp. 1-13 |
Article Number | 211 |
Number of Pages | 13 |
Year | 2017 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aa674a |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aa674a |
Abstract | We report the discovery of HAT-P-67b, which is a hot-Saturn transiting a rapidly rotating F-subgiant. HAT-P-67b has a radius of Rp=2.085 -0.071 +0.096 RJ, and orbites a M∗ = 1.642-0.072 +0.155 M, R∗ = 2.546-0.099 +0.0084 R host star in a ∼4.81 day period orbit. We place an upper limit on the mass of the planet via radial velocity measurements to be Mp < 0.59 MJ, and a lower limit of >0.056 MJ by limitations on Roche lobe overflow. Despite being a subgiant, the host star still exhibits relatively rapid rotation, with a projected rotational velocity of v sin I∗ = 35.8 ±1.1 km s-1, which makes it difficult to precisely determine the mass of the planet using radial velocities. We validated HAT-P-67b via two Doppler tomographic detections of the planetary transit, which eliminate potential eclipsing binary blend scenarios. The Doppler tomographic observations also confirm that HAT-P-67b has an orbit that is aligned to within 12, in projection, with the spin of its host star. HAT-P-67b receives strong UV irradiation and is among one of the lowest density planets known, which makes it a good candidate for future UV transit observations in the search for an extended hydrogen exosphere. |
Keywords | planetary systems; stars: individual (HAT-P-67); techniques: photometric; techniques: spectroscopic; Astrophysics - Earth; Planetary 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 | Center for Astrophysics Harvard and Smithsonian, United States |
Princeton University, United States | |
University of Copenhagen, Denmark | |
Konkoly Observatory, Hungary | |
University of California, United States | |
University of Hawaii, United States | |
National Optical Astronomy Observatory, United States | |
Hungarian Astronomical Association, Hungary | |
Google, United States | |
University of Arizona, United States | |
Southern Connecticut State University, United States | |
National Aeronautics and Space Administration (NASA), United States |
https://research.usq.edu.au/item/q6x70/hat-p-67b-an-extremely-low-density-saturn-transiting-an-f-subgiant-confirmed-via-doppler-tomography
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