Almenara, JM;
Bonfils, X;
Bryant, EM;
Jordan, A;
Hebrard, G;
Martioli, E;
Correia, ACM;
... Shang, H; + view all
(2024)
TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf.
Astronomy & Astrophysics (A&A)
, 683
, Article A166. 10.1051/0004-6361/202346999.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202346999 |
| Publisher version: | http://dx.doi.org/10.1051/0004-6361/202346999 |
| Language: | English |
| Additional information: | 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. This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication. |
| Keywords: | Techniques: photometric – techniques: radial velocities – stars: individual: TOI-4860 – stars: low-mass – planetary systems |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10191913 |
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