HAT-P-44b, HAT-P-45b, and HAT-P-46b: Three Transiting Hot Jupiters in Possible Multi-planet Systems
Article
Article Title | HAT-P-44b, HAT-P-45b, and HAT-P-46b: Three Transiting Hot Jupiters in Possible Multi-planet Systems |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Hartman, J. D. (Author), Bakos, G. A. (Author), Torres, G. (Author), Kovacs, G. (Author), Johnson, J. A. (Author), Howard, A. W. (Author), Marcy, G. W. (Author), Latham, D. W. (Author), Bieryla, A. (Author), Buchhave, L. A. (Author), Bhatti, W. (Author), Beky, B. (Author), Csubry, Z. (Author), Penev, K. (Author), de Val-Borro, M. (Author), Noyes, R. W. (Author), Fischer, D. A. (Author), Esquerdo, G. A. (Author), Everett, M. (Author), Szklenar, T. (Author), Zhou, G. (Author), Bayliss, D. (Author), Shporer, A. (Author), Fulton, B. J. (Author), Sanchis-Ojeda, R. (Author), Falco, E. (Author), Lazar, J. (Author), Papp, I. (Author) and Sari, P. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 147 (6), pp. 1-18 |
Article Number | 128 |
Number of Pages | 18 |
Year | 2014 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-6256/147/6/128 |
Web Address (URL) | https://iopscience.iop.org/article/10.1088/0004-6256/147/6/128 |
Abstract | We report the discovery by the HATNet survey of three new transiting extrasolar planets orbiting moderately bright (V = 13.2, 12.8, and 11.9) stars. The planets have orbital periods of 4.3012, 3.1290, and 4.4631 days, masses of 0.35, 0.89, and 0.49 ṀJ, and radii of 1.24, 1.43, and 1.28 R J. The stellar hosts have masses of 0.94, 1.26, and 1.28 Ṁ. Each system shows significant systematic variations in its residual radial velocities, indicating the possible presence of additional components. Based on its Bayesian evidence, the preferred model for HAT-P-44 consists of two planets, including the transiting component, with the outer planet having a period of 872 days, eccentricity of 0.494 ± 0.081, and a minimum mass of 4.0 M ̇J. Due to aliasing we cannot rule out alternative solutions for the outer planet having a period of 220 days or 438 days. For HAT-P-45, at present there is not enough data to justify the additional free parameters included in a multi-planet model; in this case a single-planet solution is preferred, but the required jitter of 22.5 ± 6.3 m s-1 is relatively high for a star of this type. For HAT-P-46 the preferred solution includes a second planet having a period of 78 days and a minimum mass of 2.0 ṀJ, however the preference for this model over a single-planet model is not very strong. While substantial uncertainties remain as to the presence and/or properties of the outer planetary companions in these systems, the inner transiting planets are well characterized with measured properties that are fairly robust against changes in the assumed models for the outer planets. Continued radial velocity monitoring is necessary to fully characterize these three planetary systems, the properties of which may have important implications for understanding the formation of hot Jupiters. |
Keywords | planetary systems; stars: individual: HAT-P-44 HAT-P-45 HAT-P-46; techniques: photometric; techniques: spectroscopic; Astrophysics - Earth; and 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 | Princeton University, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
Konkoly Observatory, Hungary | |
California Institute of Technology (Caltech), United States | |
University of Hawaii, United States | |
University of California, United States | |
University of Copenhagen, Denmark | |
Yale University, United States | |
National Optical Astronomy Observatory, United States | |
Hungarian Astronomical Association, Hungary | |
Australian National University | |
Massachusetts Institute of Technology, United States |
https://research.usq.edu.au/item/q6x3y/hat-p-44b-hat-p-45b-and-hat-p-46b-three-transiting-hot-jupiters-in-possible-multi-planet-systems
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