Kavli Affiliate: Andrew Vanderburg
| First 5 Authors: Shubham Kanodia, Arvind F. Gupta, Caleb I. Canas, Lia Marta Bernabo, Varghese Reji
| Summary:
Transiting giant exoplanets around M-dwarf stars (GEMS) are rare, owing to
the low-mass host stars. However, the all-sky coverage of TESS has enabled the
detection of an increasingly large number of them to enable statistical surveys
like the textit{Searching for GEMS} survey. As part of this endeavour, we
describe the observations of six transiting giant planets, which includes
precise mass measurements for two GEMS (K2-419Ab, TOI-6034b) and statistical
validation for four systems, which includes validation and mass upper limits
for three of them (TOI-5218b, TOI-5616b, TOI-5634Ab), while the fourth one —
TOI-5414b is classified as a `likely planet’. Our observations include radial
velocities from the Habitable-zone Planet Finder on the Hobby-Eberly Telescope,
and MAROON-X on Gemini-North, along with photometry and high-contrast imaging
from multiple ground-based facilities. In addition to TESS photometry, K2-419Ab
was also observed and statistically validated as part of the K2 mission in
Campaigns 5 and 18, which provides precise orbital and planetary constraints
despite the faint host star and long orbital period of $sim 20.4$ days. With
an equilibrium temperature of only 380 K, K2-419Ab is one of the coolest known
well-characterized transiting planets. TOI-6034 has a late F-type companion
about 40arcsec~away, making it the first GEMS host star to have an earlier
main-sequence binary companion. These confirmations add to the existing small
sample of confirmed transiting GEMS.
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