Kavli Affiliate: Alan M. Levine
| First 5 Authors: Nicholas Saunders, Samuel K. Grunblatt, Daniel Huber, J. M. Joel Ong, Kevin C. Schlaufman
| Summary:
We present the discovery of TOI-7041 b (TIC 201175570 b), a hot Saturn
transiting a red giant star with measurable stellar oscillations. We observe
solar-like oscillations in TOI-7041 with a frequency of maximum power of
$nu_{rm max} = 218.50pm2.23$ $mu$Hz and a large frequency separation of
$Deltanu = 16.5282pm0.0186$ $mu$Hz. Our asteroseismic analysis indicates
that TOI-7041 has a radius of $4.10 pm 0.06$(stat) $pm$ 0.05(sys) $R_odot$,
making it one of the largest stars around which a transiting planet has been
discovered with the Transiting Exoplanet Survey Satellite (TESS), and the
mission’s first oscillating red giant with a transiting planet. TOI-7041 b has
an orbital period of $9.691 pm 0.006$ days and a low eccentricity of $e = 0.04
pm 0.04$. We measure a planet radius of $1.02 pm 0.03$ $R_J$ with photometry
from TESS, and a planet mass of $0.36 pm 0.16$ $M_J$ ($114 pm 51$ $M_oplus$)
with ground-based radial velocity measurements. TOI-7041 b appears less
inflated than similar systems receiving equivalent incident flux, and its
circular orbit indicates that it is not undergoing tidal heating due to
circularization. The asteroseismic analysis of the host star provides some of
the tightest constraints on stellar properties for a TESS planet host and
enables precise characterization of the hot Saturn. This system joins a small
number of TESS-discovered exoplanets orbiting stars that exhibit clear stellar
oscillations and indicates that extended TESS observations of evolved stars
will similarly provide a path to improved exoplanet characterization.
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