Issue |
A&A
Volume 690, October 2024
|
|
---|---|---|
Article Number | L7 | |
Number of page(s) | 8 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202451935 | |
Published online | 09 October 2024 |
Letter to the Editor
The young exoplanetary system TOI-4562: Confirming the presence of a third body in the system
1
Departamento de Física, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, Brazil
2
European Southern Observatory, Karl Schwarzschildstr 2, D-85748 Garching bei München, Germany
3
Instituto de Astrofísica, Dep. de Ciencias Físicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. Fernández Concha 700, Santiago, Chile
4
Escola de Ciências e Tecnologia, Universidade Federal do Rio Grande do Norte, Campus Universitário, Natal-RN 59072-970, Brazil
5
Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal-RN, Brazil
6
Fundación Chilena de Astronomía, El Vergel 2252, Santiago, Chile
7
Vatican Observatory, Specola Vaticana, V-00120 Vatican City, Vatican City State
8
Department of Astronomy, Yale University, 219 Prospect Street, New Haven, CT 06511, USA
9
Laboratório Nacional de Astrofísica, Rua Estados Unidos 154, 37504-364 Itajubá-MG, Brazil
10
Coordenadoria Especial de Física, Química e Matemática, Universidade Federal de Santa Catarina, Jardim das Avenidas 88906-072, Araranguá, Brazil
11
Instituto Nacional de Pesquisas Espaciais, Avenida dos Astronautas, 1758, São José dos Campos-SP, Brazil
Received:
20
August
2024
Accepted:
9
September
2024
Context. Young planetary systems represent an opportunity to investigate the early stages of (exo)planetary formation because the gravitational interactions have not yet significantly changed the initial configuration of the system.
Aims. TOI-4562 b is a highly eccentric temperate Jupiter analogue orbiting a young F7V-type star of < 700 Myr in age with an orbital period of Porb ∼ 225 days and an eccentricity of e = 0.76, and is one of the largest known exoplanets to have formed in situ.
Methods. We observed a new transit of TOI-4562 b using the 0.6-m Zeiss telescope at the Pico dos Dias Observatory (OPD/LNA) in Minas Gerais, Brazil, and combine our data with Transiting Exoplanet Survey Satellite (TESS) and archive data, with the aim being to improve the ephemerides of this interesting system.
Results. The O − C diagram for the new ephemeris is consistent with the presence of a giant planet in an outer orbit around TOI-4562. TOI-4562 c is a planet with a mass of M = 5.77 MJup, an orbital period of Porb = 3990 days, and a semi-major axis of a = 5.219 AU.
Conclusions. We report the discovery of TOI-4562 c, the exoplanet with the longest orbital period discovered to date via the transit timing variation (TTV) method. The TOI-4562 system is in the process of violent evolution with intense dynamical changes – judging by its young age and high eccentricity – and is therefore a prime target for studies of formation and evolution of planetary systems.
Key words: planets and satellites: dynamical evolution and stability / planets and satellites: formation / stars: activity
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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