학술논문
TOI-3235 b: a transiting giant planet around an M4 dwarf star
Document Type
Working Paper
Author
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.
Source
Subject
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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 $\mathrm{0.665\pm0.025\,M_J}$ and a radius of $\mathrm{1.017\pm0.044\,R_J}$. It orbits close to its host star, with an orbital period of $\mathrm{2.5926\,d}$, but has an equilibrium temperature of $\mathrm{\approx 604 \, K}$, well below the expected threshold for radius inflation of hot Jupiters. The host star has a mass of $\mathrm{0.3939\pm0.0030\,M_\odot}$, a radius of $\mathrm{0.3697\pm0.0018\,R_\odot}$, an effective temperature of $\mathrm{3389 \, K}$, and a J-band magnitude of $\mathrm{11.706\pm0.025}$. 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.
Comment: 15 pages, 4 figures. Accepted for publication in APJL
Comment: 15 pages, 4 figures. Accepted for publication in APJL