TOpI-2447 b / NGTS-29 b: A 69-day Saturn around a Solar analogue

Samuel Gill, Daniel Bayliss, Solène Ulmer-Moll, Peter J. Wheatley, Rafael Brahm, David R. Anderson, David Armstrong, Ioannis Apergis, Douglas R. Alves, Matthew R. Burleigh, R. P. Butler, François Bouchy, Matthew P. Battley, Edward M. Bryant, Allyson Bieryla, Jeffrey D. Crane, Karen A. Collins, Sarah L. Casewell, Ilaria Carleo, Alastair B. ClaringboldPaul A. Dalba, Diana Dragomir, Philipp Eigmüller, Jan Eberhardt, Michael Fausnaugh, Maximilian N. Günther, Nolan Grieves, Michael R. Goad, Edward Gillen, Janis Hagelberg, Melissa Hobson, Christina Hedges, Beth A. Henderson, Faith Hawthorn, Thomas Henning, Matías I. Jones, Andres Jordán, James S. Jenkins, Michelle Kunimoto, Andreas F. Krenn, Alicia Kendall, Monika Lendl, James McCormac, Maximiliano Moyano, Pascal Torres-Miranda, Louise D. Nielsen, Ares Osborn, Jon Otegi, Hugh Osborn, Samuel N. Quinn, Joseph E. Rodriguez, Gavin Ramsay, Martin Schlecker, Stephen A. Shectman, Sara Seager, Rosanna H. Tilbrook, Trifon Trifonov, Johanna K. Teske, Stephane Udry, Jose I. Vines, Richard R. West, Bill Wohler, Joshua N. Winn, Sharon X. Wang, George Zhou, Tafadzwa Zivave

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Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)1444-1458
Número de páginas15
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen532
N.º2
DOI
EstadoPublicada - 1 ago. 2024
Publicado de forma externa

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