A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS
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Published:2024-03
Issue:
Volume:683
Page:A192
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ISSN:0004-6361
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Container-title:Astronomy & Astrophysics
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language:
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Short-container-title:A&A
Author:
Jones Matías I., Reinarz YaredORCID, Brahm Rafael, Tala Pinto Marcelo, Eberhardt Jan, Rojas FelipeORCID, Triaud Amaury H. M. J., Gupta Arvind F., Ziegler Carl, Hobson Melissa J., Jordán Andrés, Henning Thomas, Trifonov Trifon, Schlecker Martin, Espinoza Néstor, Torres-Miranda PascalORCID, Sarkis Paula, Ulmer-Moll SolèneORCID, Lendl Monika, Uzundag MuratORCID, Moyano Maximiliano, Hesse KatharineORCID, Caldwell Douglas A.ORCID, Shporer Avi, Lund Michael B., Jenkins Jon M., Seager Sara, Winn Joshua N., Ricker George R., Burke Christopher J., Figueira Pedro, Psaridi AngelicaORCID, Al Moulla KhaledORCID, Mounzer DanyORCID, Standing Matthew R.ORCID, Martin David V., Dransfield Georgina, Baycroft ThomasORCID, Dragomir Diana, Boyle GavinORCID, Suc Vincent, Mann Andrew W., Timmermans Mathilde, Ducrot Elsa, Hooton Matthew J., Zuñiga-Fernández SebastiánORCID, Sebastian Daniel, Gillon MichaelORCID, Queloz Didier, Carson Joe, Lissauer Jack J.ORCID
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.
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