A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS

Matías I. Jones, Yared Reinarz, Rafael Brahm, Marcelo Tala Pinto, Jan Eberhardt, Felipe Rojas, Amaury H.M.J. Triaud, Arvind F. Gupta, Carl Ziegler, Melissa J. Hobson, Andrés Jordán, Thomas Henning, Trifon Trifonov, Martin Schlecker, Néstor Espinoza, Pascal Torres-Miranda, Paula Sarkis, Solène Ulmer-Moll, Monika Lendl, Murat UzundagMaximiliano Moyano, Katharine Hesse, Douglas A. Caldwell, Avi Shporer, Michael B. Lund, Jon M. Jenkins, Sara Seager, Joshua N. Winn, George R. Ricker, Christopher J. Burke, Pedro Figueira, Angelica Psaridi, Khaled Al Moulla, Dany Mounzer, Matthew R. Standing, David V. Martin, Georgina Dransfield, Thomas Baycroft, Diana Dragomir, Gavin Boyle, Vincent Suc, Andrew W. Mann, Mathilde Timmermans, Elsa Ducrot, Matthew J. Hooton, Sebastián Zuñiga-Fernández, Daniel Sebastian, Michael Gillon, Didier Queloz, Joe Carson, Jack J. Lissauer

Research output: Contribution to journalArticlepeer-review

Abstract

We report on the confirmation and follow-up characterization of two long-period transiting substellar companions on low-eccentricity orbits around TIC 4672985 and TOI-2529, whose transit events were detected by the TESS space mission. Ground-based photometric and spectroscopic follow-up from different facilities, confirmed the substellar nature of TIC 4672985 b, a massive gas giant in the transition between the super-Jupiters and brown dwarfs mass regime. From the joint analysis we derived the following orbital parameters: P = 69.0480-0.0005+0.0004 d, Mp = 12.74-1.01+1.01 Mj, Rp = 1.026-0.067+0.065 Rj and e = 0.018-0.004+0.004. In addition, the RV time series revealed a significant trend at the ~350 m s-1 yr-1 level, which is indicative of the presence of a massive outer companion in the system. TIC 4672985 b is a unique example of a transiting substellar companion with a mass above the deuterium-burning limit, located beyond 0.1 AU and in a nearly circular orbit. These planetary properties are difficult to reproduce from canonical planet formation and evolution models. For TOI-2529 b, we obtained the following orbital parameters: P = 64.5949-0.0003+0.0003 d, Mp = 2.340-0.195+0.197 Mj, Rp = 1.030-0.050+0.050 Rj and e = 0.021-0.015+0.024, making this object a new example of a growing population of transiting warm giant planets.

Original languageEnglish (US)
Article numberA192
JournalAstronomy and Astrophysics
Volume683
DOIs
StatePublished - Mar 1 2024

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Planets and satellites: composition
  • Planets and satellites: detection
  • Planets and satellites: formation
  • Planets and satellites: gaseous planets
  • Techniques: photometric
  • Techniques: radial velocities

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