J/A+A/650/A145 TOI-269 b light curves (Cointepas+, 2021)
TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA.
Cointepas M., Almenara J.M., Bonfils X., Bouchy F., Astudillo-Defru N.,
Murgas F., Otegi J.F., Wyttenbach A., Anderson D.R., Artigau E.,
Canto Martins B.L., Charbonneau D., Collins K.A., Collins K.I.,
Correia J-J., Curaba S., Delboulbe A., Delfosse X., Diaz R.F., Dorn C.,
Doyon R., Feautrier P., Figueira P., Forveille T., Gaisne G., Gan T.,
Gluck L., Helled R., Hellier C., Jocou L., Kern P., Lafrasse S., Law N.,
Leao I.C., Lovis C., Magnard Y., Mann A.W., Maurel D., de Medeiros J.R.,
Melo C., Moulin T., Pepe F., Rabou P., Rochat S., Rodriguez D.R., Roux A.,
Santos N.C., Segransan D., Stadler E., Ting E.B., Twicken J.D., Udry S.,
Waalkes W.C., West R.G., Wuensche A., Ziegler C., Ricker G., Vanderspek R.,
Latham D.W., Seager S., Winn J., Jenkins J.M.
<Astron. Astrophys. 650, A145 (2021)>
=2021A&A...650A.145C 2021A&A...650A.145C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Spectroscopy
Keywords: planets and satellites: detection - stars: low-mass -
techniques: photometric - techniques: radial velocities
Abstract:
We present the confirmation of a new sub-Neptune close to the
transition between Super-Earths and sub-Neptunes transiting the M2
dwarf TOI-269. The exoplanet candidate is identified in multiple TESS
sectors and is validated with high-precision spectroscopy from HARPS
and ground-based photometric follow-up from ExTrA and LCO-CTIO. We
determine mass, radius and bulk density of the exoplanet by jointly
modeling both photometry and radial velocities with juliet. The
transiting exoplanet has an orbital period of P=3.7 days, a radius of
2.77±0.12R⊕, and a mass of 8.8±1.4M⊕. Since
TOI-269 b lies among the best targets of its category for atmospheric
characterization, it would be interesting to probe the atmosphere of
this exoplanet with transmission spectroscopy in order to compare it
to other sub-Neptunes. With an eccentricity e=0.425+0.082-0.086,
TOI-269 b has one of the highest eccentricity among exoplanets with
periods less than 10 days. The star being likely a few Gyr old, this
system does not appear to be dynamically young. We surmise TOI-269 b
may have acquired a high eccentricity as it migrated inward through
planet-planet interactions.
Description:
Photometric fluxes for each ExTrA telescopes for the observation of
TOI-269. The first column corresponds to the time of the observation
in BJD_TDB. The second and third columns correspond respectively to
the flux and flux_error on the raw light curves. The fourth and fifth
columns correspond respectively to the flux and flux_error on the
detrended light curves using Gaussian processes.
Objects:
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RA (2000) DE Designation(s)
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05 03 23.11 -54 10 39.8 TOI-269 = TIC 220479565
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 238 Photometric fluxes for ExTrA telescope 1
table2.dat 65 657 Photometric fluxes for ExTrA telescope 2
table3.dat 65 657 Photometric fluxes for ExTrA telescope 3
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Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 17 F17.9 d BJD Time of observation in BJD_TDB
20- 28 F9.7 --- Flux Normalized raw flux (flux_raw)
31- 41 F11.9 --- e_Flux rms uncertainty on Flux (fluxrawerr)
44- 52 F9.7 --- FluxD Normalized detrended flux (flux_detrended)
55- 65 F11.9 --- e_FluxD rms uncertainty on FluxD (fluxdetrendederr)
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Acknowledgements:
Marion Cointepas, marion.cointepas(at)univ-grenoble-alpes.fr
(End) Patricia Vannier [CDS] 16-Apr-2021