J/A+A/683/A166 RV of TOI-4860 (Almenara+, 2024)
TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf.
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.,
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.
<Astron. Astrophys., 683, A166 (2024)>
=2024A&A...683A.166A 2024A&A...683A.166A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: techniques: photometric - techniques: radial velocities -
stars: individual: TOI-4860 - stars: low-mass - planetary systems
Abstract:
We report the discovery and characterisation of a giant transiting
planet orbiting a nearby M3.5V dwarf (d=80.4pc, G=15.1mag, K=11.2mag,
R*=0.358±0.015R☉, M*=0.340±0.009M☉). 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±0.03RJ 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±0.006MJ). Based on these measurements, TOI-4860 b joins the
small set of massive planets (>80ME) found around mid to late M
dwarfs (<0.4R☉), 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±0.26MJ, but additional
data would be needed to confirm this.
Description:
TOI-4860 was observed between March 2022 and July 2023 with SPIRou as
part of the large programme SPIRou Legacy Survey (SLS; ID P42, PI:
Jean-Francois Donati). It was observed at 28 observing epochs with
four Polarimetric exposures per epoch, except on 4 July 2023 when the
sequence was interrupted after the first exposure. In total, 109
spectra were acquired with integration time changing from 184 s for
the first 8 exposures to 602s for the rest of the sequence. The
median signal-to-noise ratio (S/N) per pixel measured in the middle of
the H band for the two exposure times were 9 and 28, respectively.
Objects:
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RA (2000) DE Designation(s)
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12 14 15.53 -13 10 29.3 TOI-4860 = 2MASS J12141555-1310290
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea2.dat 50 116 Radial velocity measurements
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d Time Barycentric Julian date (TDB)
16- 18 A3 --- n_Time Note (1)
21- 28 F8.2 m/s RV Radial velocity
31- 35 F5.2 m/s e_RV Radial velocity error
37- 40 I4 s ExpTime Exposure time
43- 50 A8 --- Inst Instrument
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Note (1): Note as follows:
a = Flagged by the telluric correction algorithm
b = Observation during transit
c = Not used in the analysis
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Apr-2024