Kavli Affiliate: Andrew Vanderburg
| First 5 Authors: Adam Distler, Melinda Soares-Furtado, Andrew Vanderburg, Jack Schulte, Juliette Becker
| Summary:
We present the discovery and characterization of TOI-4364,b, a young
mini-Neptune in the tidal tails of the Hyades cluster, identified through TESS
transit observations and ground-based follow-up photometry. The planet orbits a
bright M dwarf ($K=9.1$,mag) at a distance of 44,pc, with an orbital period
of 5.42,days and an equilibrium temperature of $488^{+4}_{-4}$,K. The host
star’s well-constrained age of 710,Myr makes TOI-4364,b an exceptional target
for studying early planetary evolution around low-mass stars. We determined a
planetary radius of $2.01^{+0.1}_{-0.08}$,Earth radii, indicating that this
planet is situated near the upper edge of the radius valley. This suggests that
the planet retains a modest H/He envelope. As a result, TOI-4364,b provides a
unique opportunity to explore the transition between rocky super-Earths and
gas-rich mini-Neptunes at the early stages of evolution. Its radius, which may
still evolve as a result of ongoing atmospheric cooling, contraction, and
photoevaporation, further enhances its significance for understanding planetary
development. Furthermore, TOI-4364,b possesses a moderately high Transmission
Spectroscopy Metric of 44.2, positioning it as a viable candidate for
atmospheric characterization with instruments such as JWST. This target has the
potential to offer crucial insights into atmospheric retention and loss in
young planetary systems.
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