Kavli Affiliate: Andrew Vanderburg
| First 5 Authors: Sydney Jenkins, Andrew Vanderburg, Ritika Sethi, Sarah Millholland, Joseph E. Rodriguez
| Summary:
Though missions such as Kepler, K2, and TESS have discovered $>$2,000
sub-Neptune and Neptunian planets, there is a dearth of such planets at
close-in (P$lesssim$3 days) orbits. This feature, called the Neptune desert or
the evaporation desert, is believed to be primarily shaped by planetary
migration and photoevaporation. However, this region is not completely devoid
of planets–a small number of very hot Neptunes reside within the desert. These
planets provide an opportunity to directly probe the effects of migration and
photoevaporation. We present confirmation of TOI-5800 b, an eccentric
sub-Neptune on a $approx$2.6 day period that is likely actively undergoing
tidal migration. We use radial velocity measurements from the Carnegie Planet
Finder Spectrograph (PFS) to constrain TOI-5800 b’s mass and eccentricity. We
find that it has an unusually high eccentricity (0.39$pm$0.07) for its short
orbit. TOI-5800 is therefore currently experiencing high levels of tidal
heating as it moves into the desert. Ranked as a top candidate for transmission
and emission spectroscopy within its temperature and radius regime, TOI-5800 b
is a prime target for atmospheric characterization with JWST. TOI-5800 b
presents a unique opportunity to study the atmosphere of a planet undergoing
tidal heating and to probe the composition of sub-Neptune planets.
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