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

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dc.contributor.authorGill, Samuel
dc.contributor.authorBayliss, Daniel
dc.contributor.authorUlmer-Moll, Solene
dc.contributor.authorWheatley, Peter J.
dc.contributor.authorBrahm, Rafael
dc.contributor.authorAnderson, David R.
dc.contributor.authorArmstrong, David
dc.contributor.authorApergis, Ioannis
dc.contributor.authorAlves, Douglas R.
dc.contributor.authorBurleigh, Matthew R.
dc.contributor.authorButler, R. P.
dc.contributor.authorBouchy, Francois
dc.contributor.authorBattley, Matthew P.
dc.contributor.authorBryant, Edward M.
dc.contributor.authorBieryla, Allyson
dc.contributor.authorCrane, Jeffrey D.
dc.contributor.authorCollins, Karen A.
dc.contributor.authorCasewell, Sarah L.
dc.contributor.authorCarleo, Ilaria
dc.contributor.authorClaringbold, Alastair B.
dc.contributor.authorDalba, Paul A.
dc.contributor.authorDragomir, Diana
dc.contributor.authorEigmueller, Philipp
dc.contributor.authorEberhardt, Jan
dc.contributor.authorFausnaugh, Michael
dc.contributor.authorGunther, Maximilian N.
dc.contributor.authorGrieves, Nolan
dc.contributor.authorGoad, Michael R.
dc.contributor.authorGillen, Edward
dc.contributor.authorHagelberg, Janis
dc.contributor.authorHobson, Melissa
dc.contributor.authorHedges, Christina
dc.contributor.authorHenderson, Beth A.
dc.contributor.authorHawthorn, Faith
dc.contributor.authorHenning, Thomas
dc.contributor.authorJones, Matias, I
dc.contributor.authorJordan, Andres
dc.contributor.authorJenkins, James S.
dc.contributor.authorKunimoto, Michelle
dc.contributor.authorKrenn, Andreas F.
dc.contributor.authorKendall, Alicia
dc.contributor.authorLendl, Monika
dc.contributor.authorMcCormac, James
dc.contributor.authorMoyano, Maximiliano
dc.contributor.authorTorres-Miranda, Pascal
dc.contributor.authorNielsen, Louise D.
dc.contributor.authorOsborn, Ares
dc.contributor.authorOtegi, Jon
dc.contributor.authorOsborn, Hugh
dc.contributor.authorQuinn, Samuel N.
dc.contributor.authorRodriguez, Joseph E.
dc.contributor.authorRamsay, Gavin
dc.contributor.authorSchlecker, Martin
dc.contributor.authorShectman, Stephen A.
dc.contributor.authorSeager, Sara
dc.contributor.authorTilbrook, Rosanna H.
dc.contributor.authorTrifonov, Trifon
dc.contributor.authorTeske, Johanna K.
dc.contributor.authorUdry, Stephane
dc.contributor.authorVines, Jose, I
dc.contributor.authorWest, Richard R.
dc.contributor.authorWohler, Bill
dc.contributor.authorWinn, Joshua N.
dc.contributor.authorWang, Sharon X.
dc.contributor.authorZhou, George
dc.contributor.authorZivave, Tafadzwa
dc.date.accessioned2025-01-20T16:13:21Z
dc.date.available2025-01-20T16:13:21Z
dc.date.issued2024
dc.description.abstractDiscovering transiting exoplanets with relatively long orbital periods (>10 d) is crucial to facilitate the study of cool exoplanet atmospheres (T-eq < 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 (T-eff = 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 0.865 +/- 0.010 R-J, while radial velocity measurements give a mass of 0.386 +/- 0.025 M-J. 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 similar to 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.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stae1256
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stae1256
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90382
dc.identifier.wosidWOS:001265608500001
dc.issue.numero2
dc.language.isoen
dc.pagina.final1458
dc.pagina.inicio1444
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectinstrumentation: spectrographs
dc.subjectmethods: data analysis
dc.subjecttechniques: photometric
dc.subjecttechniques: radial velocities
dc.subjectplanets and satellites: detection
dc.subjectplanets and satellites: fundamental parameters
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleTOpI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue
dc.typeartículo
dc.volumen532
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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