Bibcode
Cointepas, M.; Almenara, J. M.; Bonfils, X.; Bouchy, F.; Astudillo-Defru, N.; Murgas, F.; Otegi, J. F.; Wyttenbach, A.; Anderson, D. R.; Artigau, É.; Canto Martins, B. L.; Charbonneau, D.; Collins, K. A.; Collins, K. I.; Correia, J. -J.; Curaba, S.; Delboulbé, A.; Delfosse, X.; Díaz, 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.; Leão, 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.; Ségransan, D.; Stadler, E.; Ting, E. B.; Twicken, J. D.; Udry, S.; Waalkes, W. C.; West, R. G.; Wünsche, A.; Ziegler, C.; Ricker, G.; Vanderspek, R.; Latham, D. W.; Seager, S.; Winn, J.; Jenkins, J. M.
Bibliographical reference
Astronomy and Astrophysics
Advertised on:
6
2021
Journal
Citations
23
Refereed citations
21
Description
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 (TIC 220 479 565, V = 14.4 mag, J = 10.9 mag, R⋆ = 0.40 R⊙, M⋆ = 0.39 M⊙, d = 57 pc). The exoplanet candidate has been identified in multiple TESS sectors, and validated with high-precision spectroscopy from HARPS and ground-based photometric follow-up from ExTrA and LCO-CTIO. We determined 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 = 3.6977104 ± 0.0000037 days, a radius of 2.77 ± 0.12 R⊕, and a mass of 8.8 ± 1.4 M⊕. 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 = 0.425−0.086+0.082, TOI-269 b has one of the highest eccentricities of the 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 its high eccentricity as it migrated inward through planet-planet interactions.
ExTrA photometric data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/650/A145
Related projects
Exoplanets and Astrobiology
The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
Enric
Pallé Bago