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Almenara, J.M.; Bonfils, X.; Bryant, E.M.; Jordan, A.; Hebrard, G.; Martioli, E.; Correia, A.C.M.; Astudillo-Defru, N.; Cadieux, C.; Arnold, L.; Artigau, E.; Bakos, G.A.; Barros, S.C.C.; Bayliss, D.; Bouchy, F.; Boue, G.; Brahm, R.; Carmona, A.; Charbonneau, D.; Ciardi, D.R.; Cloutier, R.; Cointepas, M.; Cook, N.J.; Cowan, N.B.; Delfosse, X.; do Nascimento, J.D.; Donati, J.F.; Doyon, R.; Forveille, T.; Fouque, P.; Gaidos, E.; Gilbert, E.A.; da Silva, J.G.; 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. |
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TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf |
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2024 |
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Astronomy & Astrophysics |
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Astron. Astrophys. |
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683 |
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A166 |
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techniques: photometric; techniques: radial velocities; stars: individual: TOI-4860; stars: low-mass; planetary systems |
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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-circle dot, M-* = 0.340 +/- 0.009 M-circle dot). 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 R-J 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 M-J). Based on these measurements, TOI-4860 b joins the small set of massive planets (>80 M-E) found around mid to late M dwarfs (<0.4 R-circle dot), 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 M-J, but additional data would be needed to confirm this. |
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0004-6361 |
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WOS:001187386700010 |
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UAI @ alexi.delcanto @ |
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1979 |
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