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The EBLM Project- XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +104 more
Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This 'radius inflation' problem could have an impact on both stellar and exoplanetary science. We present the final results of our observation programme with the CHaracterising ExOPlanet Sa…
TOI-5126: a hot super-Neptune and warm Neptune pair discovered by TESS and CHEOPS
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +33 more
We present the confirmation of a hot super-Neptune with an exterior Neptune companion orbiting a bright (V = 10.1 mag) F-dwarf identified by the Transiting Exoplanet Survey Satellite (TESS). The two planets, observed in sectors 45, 46, and 48 of the TESS extended mission, are $4.74_{-0.14}^{+0.16}$ and $3.86_{-0.16}^{+0.17}$ R⊕ with $5.…
Confronting compositional confusion through the characterization of the sub-Neptune orbiting HD 77946
Van Eylen, V.; Vanderburg, A.; Sozzetti, A. +29 more
We report on the detailed characterization of the HD 77946 planetary system. HD 77946 is an F5 (M* = 1.17 M⊙, R* = 1.31 R⊙) star, which hosts a transiting planet recently discovered by NASA's Transiting Exoplanet Survey Satellite (TESS), classified as TOI-1778 b. Using TESS photometry, high-resolution sp…
Gliese 12 b, a temperate Earth-sized planet at 12 parsecs discovered with TESS and CHEOPS
Vanderburg, Andrew; López-Morales, Mercedes; Latham, David W. +33 more
We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright (V = 12.6 mag, K = 7.8 mag) metal-poor M4V star only 12.162 ± 0.005 pc away from the Solar system with one of the lowest stellar activity levels known for M-dwarfs. A planet candidate was detected by TESS based on on…
Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS
Pallé, E.; Zhang, H.; Winn, J. N. +31 more
We report the discovery of two mini-Neptunes in near 2:1 resonance orbits (P = 7.610303 d for HIP 113103 b and P = 14.245651 d for HIP 113103 c) around the adolescent K-star HIP 113103 (TIC 121490076). The planet system was first identified from the TESS mission, and was confirmed via additional photometric and spectroscopic observations, includin…
TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit
Alonso, R.; Bouchy, F.; Deleuil, M. +129 more
We report the spectroscopic confirmation and fundamental properties of TOI$-$757 b, a mini$-$Neptune on a 17.5$-$d orbit transiting a bright star ($V\, =\, 9.7$ mag) discovered by the TESS mission. We acquired high$-$precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine…
HD 21520 b: a warm sub-Neptune transiting a bright G dwarf
Hellier, Coel; Latham, David W.; Littlefield, Colin +49 more
We report the discovery and validation of HD 21520 b, a transiting planet found with Transiting Exoplanet Survey Satellite and orbiting a bright G dwarf (V = 9.2,
K2-370 b: a strongly irradiated sub-Neptune transiting a very active solar-type star
Vanderburg, A.; Sozzetti, A.; Wilson, T. G. +24 more
We report on the detailed characterization of K2-370 b, a transiting sub-Neptune on a 2.14-d orbit around the chromospherically active G-type dwarf HD 284521 (