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TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf
Murgas, F.
Bonfils, X.
Crossfield, I.
Almenara, J.
Livingston, J.
Stassun, K.
Korth, J.
Orell-Miquel, J.
Morello, G.
Eastman, J.
Lissauer, J.
Kane, S.
Morales, F.
Werner, M.
Gorjian, V.
Benneke, B.
Dragomir, D.
Matthews, E.
Howell, S.
Ciardi, D.
Gonzales, E.
Matson, R.
Beichman, C.
Schlieder, J.
Collins, K.
Collins, K.
Jensen, E.
Evans, P.
Pozuelos, F.
Gillon, M.
Jehin, E.
Barkaoui, K.
Artigau, E.
Bouchy, F.
Charbonneau, D.
Delfosse, X.
Díaz, R.
Doyon, R.
Figueira, P.
Forveille, T.
Lovis, C.
Melo, C.
Gaisné, G.
Pepe, F.
Santos, N.
Ségransan, D.
Udry, S.
Goeke, R.
Levine, A.
Quintana, E.
Guerrero, N.
Mireles, I.
Caldwell, D.
Tenenbaum, P.
Brasseur, C.
Ricker, G.
Vanderspek, R.
Latham, D.
Seager, S.
Winn, J.
Jenkins, J.
EDP Sciences
2021
Context. The NASA mission TESS is currently doing an all-sky survey from space to detect transiting planets around bright stars. As part of the validation process, the most promising planet candidates need to be confirmed and characterized using follow-up observations.
Aims. In this article, our aim is to confirm the planetary nature of the transiting planet candidate TOI-674b using spectroscopic and photometric observations.
Methods. We use TESS, Spitzer, ground-based light curves, and HARPS spectrograph radial velocity measurements to establish the physical properties of the transiting exoplanet candidate TOI-674b. We perform a joint fit of the light curves and radial velocity time series to measure the mass, radius, and orbital parameters of the candidate.
Results. We confirm and characterize TOI-674b, a low-density super-Neptune transiting a nearby M dwarf. The host star (TIC 158588995, V = 14.2 mag, J = 10.3 mag) is characterized by its M2V spectral type with M⋆ = 0.420 ± 0.010 M⊙, R⋆ = 0.420 ± 0.013 R⊙, and Teff = 3514 ± 57 K; it is located at a distance d = 46.16 ± 0.03 pc. Combining the available transit light curves plus radial velocity measurements and jointly fitting a circular orbit model, we find an orbital period of 1.977143 ± 3 × 10−6 days, a planetary radius of 5.25 ± 0.17 R⊕, and a mass of 23.6 ± 3.3 M⊕ implying a mean density of ρp =0.91 ± 0.15 g cm−3. A non-circular orbit model fit delivers similar planetary mass and radius values within the uncertainties. Given the measured planetary radius and mass, TOI-674b is one of the largest and most massive super-Neptune class planets discovered around an M-type star to date. It is found in the Neptunian desert, and is a promising candidate for atmospheric characterization using the James Webb Space Telescope.
Aims. In this article, our aim is to confirm the planetary nature of the transiting planet candidate TOI-674b using spectroscopic and photometric observations.
Methods. We use TESS, Spitzer, ground-based light curves, and HARPS spectrograph radial velocity measurements to establish the physical properties of the transiting exoplanet candidate TOI-674b. We perform a joint fit of the light curves and radial velocity time series to measure the mass, radius, and orbital parameters of the candidate.
Results. We confirm and characterize TOI-674b, a low-density super-Neptune transiting a nearby M dwarf. The host star (TIC 158588995, V = 14.2 mag, J = 10.3 mag) is characterized by its M2V spectral type with M⋆ = 0.420 ± 0.010 M⊙, R⋆ = 0.420 ± 0.013 R⊙, and Teff = 3514 ± 57 K; it is located at a distance d = 46.16 ± 0.03 pc. Combining the available transit light curves plus radial velocity measurements and jointly fitting a circular orbit model, we find an orbital period of 1.977143 ± 3 × 10−6 days, a planetary radius of 5.25 ± 0.17 R⊕, and a mass of 23.6 ± 3.3 M⊕ implying a mean density of ρp =0.91 ± 0.15 g cm−3. A non-circular orbit model fit delivers similar planetary mass and radius values within the uncertainties. Given the measured planetary radius and mass, TOI-674b is one of the largest and most massive super-Neptune class planets discovered around an M-type star to date. It is found in the Neptunian desert, and is a promising candidate for atmospheric characterization using the James Webb Space Telescope.
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TOI-674b. An oasis in the desert of exo-Neptunes transiting a nearby M dwarf.pdf
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general
gaseous planets
TOI-674
photometric
radial velocities