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

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, M p = 12.74 −1.01 +1.01 M j , R p = 1.026 −0.067 +0.065 R j 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, M p = 2.340 −0.195 +0.197 M j , R p = 1.030 −0.050 +0.050 R j 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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Publication Details

Journal
UNC Libraries
Published
2024-11-06
DOI
https://doi.org/10.17615/xjrc-e769
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
0.00

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article

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

Douglas A. Caldwell, Maximiliano Moyano, Jon M. Jenkins, Jan Eberhardt et al.
UNC Libraries
Stellar, planetary, and galactic studies
article

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

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

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, M p = 12.74 −1.01 +1.01 M j , R p = 1.026 −0.067 +0.065 R j 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, M p = 2.340 −0.195 +0.197 M j , R p = 1.030 −0.050 +0.050 R j and e = 0.021 −0.015 +0.024 , making this object a new example of a growing population of transiting warm giant planets.

UNC Libraries
University of North Carolina at Chapel Hill (US)
National Science Foundation, National Aeronautics and Space Administration, South Carolina Space Grant Consortium, Space Telescope Science Institute, European Space Agency, European Commission, Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Fonds De La Recherche Scientifique - FNRS, Fédération Wallonie-Bruxelles, Fonds Wetenschappelijk Onderzoek, Bulgarian National Science Fund, Nuclear Safety and Security Commission, Université de Genève, Vlaamse regering, Fondation Merac, Agencia Nacional de Investigación y Desarrollo, Ames Research Center, Science Mission Directorate, Science and Technology Facilities Council, Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture
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Stellar, planetary, and galactic studies
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