Kavli Affiliate: Robert F. Goeke
| First 5 Authors: Melissa J. Hobson, Andrés Jordán, E. M. Bryant, R. Brahm, D. Bayliss
| Summary:
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
$mathrm{0.665pm0.025,M_J}$ and a radius of $mathrm{1.017pm0.044,R_J}$. 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 $mathrm{0.3939pm0.0030,M_odot}$, a radius of
$mathrm{0.3697pm0.0018,R_odot}$, an effective temperature of $mathrm{3389
, K}$, and a J-band magnitude of $mathrm{11.706pm0.025}$. 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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