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Hobson, Melissa J.; Jordán, Andrés; Bryant, E. M.; Brahm, R.; Bayliss, D.; Hartman, J. D.; Bakos, G. Á.; Henning, Th; Almenara, Jose Manuel; Barkaoui, Khalid; Benkhaldoun, Zouhair; Bonfils, Xavier; Bouchy, François; Charbonneau, David; Cointepas, Marion; Collins, Karen A.; Eastman, Jason D.; Ghachoui, Mourad; Gillon, Michaël; Goeke, Robert F.; Horne, Keith; Irwin, Jonathan M.; Jehin, Emmanuel; Jenkins, Jon M.; Latham, David W.; Moldovan, Dan; Murgas, Felipe; Pozuelos, Francisco J.; Ricker, George R.; Schwarz, Richard P.; Seager, S.; Srdoc, Gregor; Striegel, Stephanie; Timmermans, Mathilde; Vanderburg, Andrew; Vanderspek, Roland; Winn, Joshua N.
Astrophysical journal. Letters, 03/2023, Letnik: 946, Številka: 1Journal Article, Web Resource
Abstract We present the discovery of TOI-3235 b, a short-period Jupiter orbiting an M dwarf with a stellar mass close to the critical mass at which stars transition from partially to fully convective. TOI-3235 b was first identified as a candidate from TESS photometry and confirmed with radial velocities from ESPRESSO and ground-based photometry from HATSouth, MEarth-South, TRAPPIST-South, LCOGT, and ExTrA. We find that the planet has a mass of 0.665 ± 0.025 M J and a radius of 1.017 ± 0.044 R J . It orbits close to its host star, with an orbital period of 2.5926 days but has an equilibrium temperature of ≈ 604 K, well below the expected threshold for radius inflation of hot Jupiters. The host star has a mass of 0.3939 ± 0.0030 M ☉ , a radius of 0.3697 ± 0.0018 R ☉ , an effective temperature of 3389 K, and a J -band magnitude of 11.706 ± 0.025. Current planet formation models do not predict the existence of gas giants such as TOI-3235 b around such low-mass stars. With a high transmission spectroscopy metric, TOI-3235 b is one of the best-suited giants orbiting M dwarfs for atmospheric characterization.
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