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Table · dataset · 2024

TESS-Keck Survey. XII. TOI-1347 radial velocity

Listed in IVOA Registry (Virtual Observatory)

The extreme environments of ultra-short-period planets (USPs) make excellent laboratories to study how exoplanets obtain, lose, retain, and/or regain gaseous atmospheres.

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We present the confirmation and characterization of the USP TOI-1347b, a 1.8{+/-}0.1R{Earth} planet on a 0.85day orbit that was detected with photometry from the TESS mission. We measured radial velocities of the TOI-1347 system using Keck/HIRES and HARPS-N and found the USP to be unusually massive at 11.1{+/-}1.2M{Earth}.

The measured mass and radius of TOI-1347b imply an Earth-like bulk composition. A thin H/He envelope (>0.01% by mass) can be ruled out at high confidence. The system is between 1 and 1.8Gyr old; therefore, intensive photoevaporation should have concluded.

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We detected a tentative phase-curve variation (3{sigma}) and a secondary eclipse (2{sigma}) in TESS photometry, which, if confirmed, could indicate the presence of a high-mean-molecular-weight atmosphere. We recommend additional optical and infrared observations to confirm the presence of an atmosphere and investigate its composition.

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