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.
Referencia bibliográfica

Astronomy and Astrophysics

Fecha de publicación:
3
2024
Revista
Astronomy and Astrophysics
Número de autores
50
Número de autores del IAC
1
Número de citas
5
Número de citas referidas
4
Descripción
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.
Tipo
Con árbitro
Técnicas

Te puede interesar

  • Con árbitro
    An ultra-short-period super-Earth with an extremely high density and an outer companion
    We present the discovery and characterization of a new multi-planetary system around the Sun-like star K2-360 (EPIC 201595106). K2-360 was first identified in K2 photometry as the host of an ultra-short-period (USP) planet candidate with a period of 0.88 d. We obtained follow-up transit photometry, confirming the star as the host of the signal
    Livingston, John H. et al.

    Fecha de publicación:

    11
    2024
    Bibcode
    2024NatSR..1427219L
    Número de citas
    0
  • Con árbitro
    Neural calibration of imaging Stokes polarimeters
    Current polarimetric calibration techniques derive the instrument modulation matrix by numerically fitting an instrumental model to measurements of a set of calibration Stokes vectors. These techniques are typically limited to an error on the retrieved normalized Stokes Q, U and V parameters, in the $1\times10^{-2}$ to $1\times10^{-3}$ range. This
    Iglesias, F. A. et al.

    Fecha de publicación:

    8
    2024
    Bibcode
    2024BAAA...65..281I
    Número de citas
    0
  • Con árbitro
    Model-based identification of solar coronal mass ejections using deep neural networks
    Coronal mass ejections (CMEs) are a major driver of space weather and thus can have important negative technological and social impacts. To assess their geoeffectiveness once they are ejected, it is crucial their prompt identification in coronagraph images. In the last decade, deep neural networks (DNN) have experienced enormous improvements in
    Iglesias, F. A. et al.

    Fecha de publicación:

    8
    2024
    Bibcode
    2024BAAA...65...17I
    Número de citas
    0