Kavli Affiliate: Sara Seager
| First 5 Authors: , , , ,
| Summary:
We report the discovery and confirmation of TOI-4465 b, a
$1.25^+0.08_-0.07~R_J$, $5.89pm0.26~M_J$ giant planet orbiting a G
dwarf star at $dsimeq$ 122 pc. The planet was detected as a single-transit
event in data from Sector 40 of the Transiting Exoplanet Survey Satellite
(TESS) mission. Radial velocity (RV) observations of TOI-4465 showed a
planetary signal with an orbital period of $sim$102 days, and an orbital
eccentricity of $e=0.24pm0.01$. TESS re-observed TOI-4465 in Sector 53 and
Sector 80, but did not detect another transit of TOI-4465 b, as the planet was
not expected to transit during these observations based on the RV period. A
global ground-based photometry campaign was initiated to observe another
transit of TOI-4465 b after the RV period determination. The $sim$12 hour-long
transit event was captured from multiple sites around the world, and included
observations from 24 citizen scientists, confirming the orbital period as
$sim$102 days. TOI-4465 b is a relatively dense ($3.73pm0.53~rmg/cm^3$),
temperate (375-478 K) giant planet. Based on giant planet structure models,
TOI-4465 b appears to be enriched in heavy elements at a level consistent with
late-stage accretion of icy planetesimals. Additionally, we explore TOI-4465
b’s potential for atmospheric characterization, and obliquity measurement.
Increasing the number of long-period planets by confirming single-transit
events is crucial for understanding the frequency and demographics of planet
populations in the outer regions of planetary systems.
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