TESS spots a mini-neptune interior to a hot saturn in the TOI-2000 system
Article
Article Title | TESS spots a mini-neptune interior to a hot saturn in the TOI-2000 system |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Sha, Lizhou, Vanderburg, Andrew M., Huang, Chelsea X, Armstrong, David J., Brahm, Rafael, Giacalone, Steven, Wood, Mackenna L., Collins, Karen A., Nielsen, Louise D., Hobson, Melissa J., Ziegler, Carl, Howell, Steve B., Torres-Miranda, Pascal, Mann, Andrew W., Zhou, George, Delgado-Mena, Elisa, Rojas, Felipe I., Abe, Lyu, Trifoni, Trifon, Adibekyan, Vardan, Sousa, Sérgio G., Fajardo-Acosta, Sergio, Guillot, Tristan, Howard, Saburo, Littlefield, Colin, Hawthorn, Faith, Schmider, François-Xavier, Eberhardt, Jan, Tan, Thiam-Guan, Osborn, Ares, Schwarz, Richard P., Strom, Paul, Jordan, Andrés, Wang, Gavin, Henning, Thomas, Massey, Bob, Law, Nicholas, Stockdale, Chris, Furlan, Elise, Srdoc, Gregor, Wheatley, Peter J., Barrado Y Navascues, David, Lissauer, Jack J., Stassun, Keivan G., Ricker, George R., Vanderspek, Roland K., Latham, David W., Winn, Joshua N., Seager, Sara, Jenkins, Jon M., Barclay, Thomas, Bouma, Luke G., Christiansen, Jessie L., Guerrero, Natalia and Rose, M. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 524 (1), p. 1113–1138 |
Number of Pages | 26 |
Year | 2023 |
Publisher | Oxford University Press |
Place of Publication | United States |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stad1666 |
Web Address (URL) | https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stad1666/7191273 |
Abstract | Hot jupiters (P<10d, M>60M⊕) are almost always found alone around their stars, but four out of hundreds known have inner companion planets. These rare companions allow us to constrain the hot jupiter’s formation history by ruling out high-eccentricity tidal migration. Less is known about inner companions to hot Saturn-mass planets. We report here the discovery of the TOI-2000 system, which features a hot Saturn-mass planet with a smaller inner companion. The mini-neptune TOI-2000 b (2.70±0.15R⊕, 11.0±2.4M⊕) is in a 3.10-day orbit, and the hot saturn TOI-2000 c (8.14+0.31−0.30R⊕, 81.7+4.7−4.6M⊕) is in a 9.13-day orbit. Both planets transit their host star TOI-2000 (TIC 371188886, V=10.98, TESS magnitude=10.36), a metal-rich ([Fe/H]=0.439+0.041−0.043) G dwarf 174 pc away. TESS observed the two planets in sectors 9-11 and 36-38, and we followed up with ground-based photometry, spectroscopy, and speckle imaging. Radial velocities from CHIRON, FEROS, and HARPS allowed us to confirm both planets by direct mass measurement. In addition, we demonstrate constraining planetary and stellar parameters with MIST stellar evolutionary tracks through Hamiltonian Monte Carlo under the PyMC framework, achieving higher sampling efficiency and shorter run time compared to traditional Markov chain Monte Carlo. Having the brightest host star in the V band among similar systems, TOI-2000 b and c are superb candidates for atmospheric characterization by the JWST, which can potentially distinguish whether they formed together or TOI-2000 c swept along material during migration to form TOI-2000 b. |
Keywords | planets and satellites: detection; stars: individual: TOI-2000 (TIC |
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 ©: 2023 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Wisconsin-Madison, United States |
Massachusetts Institute of Technology, United States | |
Centre for Astrophysics | |
University of Warwick, United Kingdom | |
Adolfo Ibanez University, Chile | |
Millennium Institute for Astrophysics, Chile | |
Data Observatory Foundation, Chile | |
University of California Berkeley, United States | |
University of North Carolina, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
European Southern Observatory (ESO), Germany | |
Max Planck Institute for Astronomy, Germany | |
Stephen F. Austin State University, United States | |
NASA Ames Research Center, United States | |
Catholic University of the Most Holy Conception (UCSC), Chile | |
University of Porto, Portugal | |
Cote d'Azur Observatory, France | |
Sofia University, Bulgaria | |
California Institute of Technology (Caltech), United States | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Tsinghua International School, China | |
Villa ‘39 Observatory, United States | |
Hazelwood Observatory, Australia | |
NASA Exoplanet Science Institute, United States | |
Kotizarovci Observatory, Croatia | |
Astrobiology Center, Spain | |
Vanderbilt University, United States | |
Princeton University, United States | |
NASA Goddard Space Flight Center, United States | |
University of Maryland, United States | |
University of Florida, United States |
https://research.usq.edu.au/item/yyw71/tess-spots-a-mini-neptune-interior-to-a-hot-saturn-in-the-toi-2000-system
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