TOpI-2447 b / NGTS-29 b: A 69-day Saturn around a Solar analogue
Article
Gill, Samuel, Bayliss, Daniel, Ulmer-Moll, Solene, Wheatley, Peter J., Brahm, Rafael, Anderson, David R., Armstrong, David, Apergis, Ioannis, Alves, Douglas R., Burleigh, Matthew R., Butler, R. P., Bouchy, Francois, Battley, Matthew P., Bryant, Edward M., Bieryla, Allyson, Crane, Jeffrey D., Collins, Karen A., Casewell, Sarah L., Carleo, Ilaria, ..., Zivave, Tafadzwa. 2024. "TOpI-2447 b / NGTS-29 b: A 69-day Saturn around a Solar analogue." Monthly Notices of the Royal Astronomical Society. 532 (2), pp. 1444-1458. https://doi.org/10.1093/mnras/stae1256
Article Title | TOpI-2447 b / NGTS-29 b: A 69-day Saturn around a Solar analogue |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Gill, Samuel, Bayliss, Daniel, Ulmer-Moll, Solene, Wheatley, Peter J., Brahm, Rafael, Anderson, David R., Armstrong, David, Apergis, Ioannis, Alves, Douglas R., Burleigh, Matthew R., Butler, R. P., Bouchy, Francois, Battley, Matthew P., Bryant, Edward M., Bieryla, Allyson, Crane, Jeffrey D., Collins, Karen A., Casewell, Sarah L., Carleo, Ilaria, Claringbold, Alastair B., Dalba, Paul A., Dragomir, Diana, Eigmuller, Philipp, Eberhardt, Jan, Fausnaugh, Michael, Gunther, Maximilian N., Grieves, Nolan, Goad, Michael R., Gillen, Edward, Hagelberg, Janis, Hobson, Melissa, Hedges, Christina, Henderson, Beth A., Hawthorn, Faith, Henning, Thomas, Jones, Matias I., Jordan, Andres, Jenkins, James S., Kunimoto, Michelle, Krenn, Andreas F., Kendall, Alicia, Lendl, Monika, McCormac, James, Moyano, Maximiliano, Torres-Miranda, Pascal, Nielsen, Louise D., Osborn, Ares, Otegi, Jon, Osborn, Hugh, Quinn, Samuel N., Rodriguez, Joseph E., Ramsay, Gavin, Schlecker, Martin, Shectman, Stephen A., Seager, Sara, Tilbrook, Rosanna H., Trifonov, Trifon, Teske, Johanna K., Udry, Stephane, Vines, Jose I., West, Richard R., Wohler, Bill, Winn, Joshua N., Wang, Sharon X., Zhou, George and Zivave, Tafadzwa |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 532 (2), pp. 1444-1458 |
Number of Pages | 15 |
Year | 2024 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stae1256 |
Web Address (URL) | https://academic.oup.com/mnras/article/532/2/1444/7708212 |
Abstract | Discovering transiting exoplanets with relatively long orbital periods (>10 d) is crucial to facilitate the study of cool exoplanet atmospheres (Teq < 700 K) and to understand exoplanet formation and inward migration further out than typical transiting exoplanets. In order to discover these longer period transiting exoplanets, long-Term photometric, and radial velocity campaigns are required. We report the discovery of TOI-2447 b (=NGTS-29 b), a Saturn-mass transiting exoplanet orbiting a bright (T = 10.0) Solar-Type star (Teff = 5730 K). TOI-2447 b was identified as a transiting exoplanet candidate from a single transit event of 1.3 per cent depth and 7.29 h duration in TESS Sector 31 and a prior transit event from 2017 in NGTS data. Four further transit events were observed with NGTS photometry which revealed an orbital period of P = 69.34 d. The transit events establish a radius for TOI-2447 b of, while radial velocity measurements give a mass of. The equilibrium temperature of the planet is 414 K, making it much cooler than the majority of TESS planet discoveries. We also detect a transit signal in NGTS data not caused by TOI-2447 b, along with transit timing variations and evidence for a ?150 d signal in radial velocity measurements. It is likely that the system hosts additional planets, but further photometry and radial velocity campaigns will be needed to determine their parameters with confidence. TOI-2447 b/NGTS-29 b joins a small but growing population of cool giants that will provide crucial insights into giant planet composition and formation mechanisms. © 2024 The Author(s). |
Keywords | instrumentation: spectrographs; methods: data analysis; techniques: photometric; techniques: radial velocities ; planets and satellites: detection; planets and satellites: fundamental parameters |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | University of Warwick, United Kingdom |
University of Geneva, Switzerland | |
University of Bern, Switzerland | |
Adolfo Ibanez University, Chile | |
Millennium Institute for Astrophysics, Chile | |
Data Observatory Foundation, Chile | |
University of Chile, Chile | |
Centro de Astrofísica y Tecnologías Afines (CATA), Chile | |
University of Leicester, United Kingdom | |
Carnegie Earth and Planets Laboratory, United States | |
University College London, United Kingdom | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Carnegie Institution for Science, United States | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of California Santa Cruz, United States | |
University of New Mexico, United States | |
German Aerospace Center (DLR), Germany | |
Max Planck Institute for Astronomy, Germany | |
Massachusetts Institute of Technology, United States | |
European Space Research and Technology Centre (ESTEC), Netherlands | |
Queen Mary University of London, United Kingdom | |
Cavendish Laboratory, United Kingdom | |
NASA Goddard Space Flight Center, United States | |
Catholic University of the North, Chile | |
Austrian Academy of Sciences, Austria | |
Pontifical Catholic University of Valparaiso, Chile | |
European Southern Observatory (ESO), Germany | |
Michigan State University, United States | |
Armagh Observatory and Planetarium, United Kingdom | |
University of Arizona, United States | |
Sofia University, Bulgaria | |
NASA Ames Research Center, United States | |
Princeton University, United States | |
Tsinghua University, China | |
Centre for Astrophysics |
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