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Grieves, Nolan; Bouchy, François; Ulmer-Moll, Solène; Gill, Samuel; Anderson, David R.; Psaridi, Angelica; Lendl, Monika; Stassun, Keivan G.; Jenkins, Jon M.; Burleigh, Matthew R.; Acton, Jack S.; Boyd, Patricia T.; Casewell, Sarah L.; Eigmüller, Philipp; Goad, Michael R.; Goeke, Robert F.; Günther, Maximilian N.; Hawthorn, Faith; Henderson, Beth A.; Henze, Christopher E.; Jordán, Andrés; Kendall, Alicia; Mishra, Lokesh; Moyano, Maximiliano; [...]

An old warm Jupiter orbiting the metal-poor G-dwarf TOI-5542

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  • Medientyp: E-Artikel
  • Titel: An old warm Jupiter orbiting the metal-poor G-dwarf TOI-5542
  • Beteiligte: Grieves, Nolan; Bouchy, François; Ulmer-Moll, Solène; Gill, Samuel; Anderson, David R.; Psaridi, Angelica; Lendl, Monika; Stassun, Keivan G.; Jenkins, Jon M.; Burleigh, Matthew R.; Acton, Jack S.; Boyd, Patricia T.; Casewell, Sarah L.; Eigmüller, Philipp; Goad, Michael R.; Goeke, Robert F.; Günther, Maximilian N.; Hawthorn, Faith; Henderson, Beth A.; Henze, Christopher E.; Jordán, Andrés; Kendall, Alicia; Mishra, Lokesh; Moyano, Maximiliano; [...]
  • Erschienen: EDP Sciences, 2022
  • Erschienen in: Astronomy & Astrophysics, 668 (2022), Seite A29
  • Sprache: Nicht zu entscheiden
  • DOI: 10.1051/0004-6361/202244077
  • ISSN: 0004-6361; 1432-0746
  • Entstehung:
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  • Beschreibung: We report the discovery of a 1.32−0.10+0.10 MJup planet orbiting on a 75.12 day period around the G3V 10.8−3.6+2.1 Gyr old star TOI-5542 (TIC 466206508; TYC 9086-1210-1). The planet was first detected by the Transiting Exoplanet Survey Satellite (TESS) as a single transit event in TESS Sector 13. A second transit was observed 376 days later in TESS Sector 27. The planetary nature of the object has been confirmed by ground-based spectroscopic and radial velocity observations from the CORALIE and HARPS spectrographs. A third transit event was detected by the ground-based facilities NGTS, EulerCam, and SAAO. We find the planet has a radius of 1.009−0.035+0.036 RJup and an insolation of 9.6−0.8+0.9 S⊕, along with a circular orbit that most likely formed via disk migration or in situ formation, rather than high-eccentricity migration mechanisms. Our analysis of the HARPS spectra yields a host star metallicity of [Fe/H] = −0.21 ± 0.08, which does not follow the traditional trend of high host star metallicity for giant planets and does not bolster studies suggesting a difference among low- and high-mass giant planet host star metallicities. Additionally, when analyzing a sample of 216 well-characterized giant planets, we find that both high masses (4 MJup < Mp < 13 MJup) and low masses (0.5 MJup < Mp < 4 MJup), as well as both both warm (P > 10 days) and hot (P < 10 days) giant planets are preferentially located around metal-rich stars (mean [Fe/H] > 0.1). TOI-5542b is one of the oldest known warm Jupiters and it is cool enough to be unaffected by inflation due to stellar incident flux, making it a valuable contribution in the context of planetary composition and formation studies.
  • Zugangsstatus: Freier Zugang