TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf

Bibcode
2024A&A...683A.166A
DOI
10.1051/0004-6361/202346999
Almenara, J. M.; Bonfils, X.; Bryant, E. M.; Jordán, A.; Hébrard, G.; Martioli, E.; Correia, A. C. M.; Astudillo-Defru, N.; Cadieux, C.; Arnold, L.; Artigau, É.; Bakos, G. Á.; Barros, S. C. C.; Bayliss, D.; Bouchy, F.; Boué, G.; Brahm, R.; Carmona, A.; Charbonneau, D.; Ciardi, D. R.; Cloutier, R.; Cointepas, M.; Cook, N. J.; Cowan, N. B.; Delfosse, X.; Dias do Nascimento, J.; Donati, J. -F.; Doyon, R.; Forveille, T.; Fouqué, P.; Gaidos, E.; Gilbert, E. A.; Gomes da Silva, J.; Hartman, J. D.; Hesse, K.; Hobson, M. J.; Jenkins, J. M.; Kiefer, F.; Kostov, V. B.; Laskar, J.; Lendl, M.; L'Heureux, A.; Martins, J. H. C.; Menou, K.; Moutou, C.; Murgas, F.; Polanski, A. S.; Rapetti, D.; Sedaghati, E.; Shang, H.
Bibliographical reference

Astronomy and Astrophysics

Advertised on:
3
2024
Journal
Astronomy and Astrophysics
Number of authors
50
IAC number of authors
1
Citations
7
Refereed citations
7
Description
We report the discovery and characterisation of a giant transiting planet orbiting a nearby M3.5V dwarf (d = 80.4pc, G = 15.1 mag, K=11.2mag, R* = 0.358 ± 0.015 R⊙, M* = 0.340 ± 0.009 M⊙). Using the photometric time series from TESS sectors 10, 36, 46, and 63 and near-infrared spectrophotometry from ExTrA, we measured a planetary radius of 0.77 ± 0.03 RJ and an orbital period of 1.52 days. With high-resolution spectroscopy taken by the CFHT/SPIRou and ESO/ESPRESSO spectrographs, we refined the host star parameters ([Fe/H] = 0.27 ± 0.12) and measured the mass of the planet (0.273 ± 0.006 MJ). Based on these measurements, TOI-4860 b joins the small set of massive planets (>80 ME) found around mid to late M dwarfs (<0.4 R⊙), providing both an interesting challenge to planet formation theory and a favourable target for further atmospheric studies with transmission spectroscopy. We identified an additional signal in the radial velocity data that we attribute to an eccentric planet candidate (e = 0.66 ± 0.09) with an orbital period of 427 ± 7 days and a minimum mass of 1.66 ± 0.26 MJ, but additional data would be needed to confirm this.
Related projects
Projects' name image
Exoplanets and Astrobiology
The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
Enric
Pallé Bago
In progress
Type
Refereed
Exoplanetary Systems & Solar System (SEYSS)
Techniques

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