Kavli Affiliate: Avi Shporer
| First 5 Authors: Robert A. Wittenmyer, Jake T. Clark, Trifon Trifonov, Brett C. Addison, Duncan J. Wright
| Summary:
The imminent launch of space telescopes designed to probe the atmospheres of
exoplanets has prompted new efforts to prioritise the thousands of transiting
planet candidates for follow-up characterisation. We report the detection and
confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with
ground-based observations from Minerva-Australis, NRES, and the Las Cumbres
Observatory Global Telescope. This planet has a radius of
$1.04^{+0.06}_{-0.05},R_{Jup}$, a mass of $0.214^{+0.040}_{-0.038},M_{Jup}$,
an orbital period of $9.5739^{+0.0002}_{-0.0001}$ days, and an extremely low
density ($rho$=0.252$pm$0.091 g cm$^{-3}$). TOI-1842b has among the best
known combinations of large atmospheric scale height (893 km) and host-star
brightness ($J=8.747$ mag), making it an attractive target for atmospheric
characterisation. As the host star is beginning to evolve off the main
sequence, TOI-1842b presents an excellent opportunity to test models of gas
giant re-inflation. The primary transit duration of only 4.3 hours also makes
TOI-1842b an easily-schedulable target for further ground-based atmospheric
characterisation.
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