TOI-216b and TOI-216 c: Two Warm, Large Exoplanets in or Slightly Wide of the 2:1 Orbital Resonance
Article
Article Title | TOI-216b and TOI-216 c: Two Warm, Large Exoplanets in or Slightly Wide of the 2:1 Orbital Resonance |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Dawson, Rebekah I. (Author), Huang, Chelsea X. (Author), Lissauer, Jack J. (Author), Collins, Karen A. (Author), Sha, Lizhou (Author), Armstrong, James (Author), Conti, Dennis M. (Author), Collins, Kevin I. (Author), Evans, Phil (Author), Gan, Tianjun (Author), Horne, Keith (Author), Ireland, Michael (Author), Murgas, Felipe (Author), Myers, Gordon (Author), Relles, Howard M. (Author), Sefako, Ramotholo (Author), Shporer, Avi (Author), Stockdale, Chris (Author), Zerjal, Marusa (Author), Zhou, George (Author), Ricker, G. (Author), Vanderspek, R. (Author), Latham, David W. (Author), Seager, S. (Author), Winn, J. (Author), Jenkins, Jon M. (Author), Bouma, L. G. (Author), Caldwell, Douglas A. (Author), Daylan, Tansu (Author), Doty, John P. (Author), Dynes, Scott (Author), Esquerdo, Gilbert A. (Author), Rose, Mark (Author), Smith, Jeffrey C. (Author) and Yu, Liang (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 158 (2), pp. 1-13 |
Article Number | 65 |
Number of Pages | 13 |
Year | 2019 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ab24ba |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ab24ba |
Abstract | Warm, large exoplanets with 10-100 day orbital periods pose a major challenge to our understanding of how planetary systems form and evolve. Although high eccentricity tidal migration has been invoked to explain their proximity to their host stars, a handful reside in or near orbital resonance with nearby planets, suggesting a gentler history of in situ formation or disk migration. Here we confirm and characterize a pair of warm, large exoplanets discovered by the TESS Mission orbiting K-dwarf TOI-216. Our analysis includes additional transits and transit exclusion windows observed via ground-based follow-up. We find two families of solutions, one corresponding to a sub-Saturn-mass planet accompanied by a Neptune-mass planet and the other to a Jupiter in resonance with a sub-Saturn-mass planet. We prefer the second solution based on the orbital period ratio, the planet radii, the lower free eccentricities, and libration of the 2:1 resonant argument, but cannot rule out the first. The free eccentricities and mutual inclination are compatible with stirring by other, undetected planets in the system, particularly for the second solution. We discuss prospects for better constraints on the planets’ properties and orbits through follow-up, including transits observed from the ground. |
Keywords | planets and satellites: detection; planets and satellites: dynamical; evolution and stability; 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 | Pennsylvania State University, United States |
Massachusetts Institute of Technology, United States | |
NASA Ames Research Center, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Hawaii, United States | |
American Association of Variable Star Observers, United States | |
Vanderbilt University, United States | |
El Sauce Observatory, Chile | |
Tsinghua University, China | |
University of St Andrews, United Kingdom | |
Australian National University | |
Institute of Astrophysics of the Canary Islands, Spain | |
South African Astronomical Observatory, South Africa | |
Hazelwood Observatory, Australia | |
Princeton University, United States | |
Noqsi Aerospace, United States |
https://research.usq.edu.au/item/q6x39/toi-216b-and-toi-216-c-two-warm-large-exoplanets-in-or-slightly-wide-of-the-2-1-orbital-resonance
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