Kavli Affiliate: Andrew M. Vanderburg
| First 5 Authors: Anne Dattilo, Anne Dattilo, , ,
| Summary:
Young planets with mass measurements are particularly valuable in studying
atmospheric mass-loss processes, but these planets are rare and their masses
difficult to measure due to stellar activity. We report the discovery of a
planetary system around TOI-6109, a young, 75 Myr-old Sun-like star in the
Alpha Persei cluster. It hosts at least two transiting Neptune-like planets.
Using three TESS sectors, 30 CHEOPS orbits, and photometric follow-up
observations from the ground, we confirm the signals of the two planets.
TOI-6109 b has an orbital period of P=$5.6904^+0.0004_-0.0004$ days and a
radius of R=$4.87^+0.16_-0.12$ R$_oplus$. The outer planet, TOI-6109 c has
an orbital period of P=$8.5388^+0.0006_-0.0005$ days and a radius of
R=$4.83^+0.07_-0.06$ R$_oplus$. These planets orbit just outside a 3:2
mean motion resonance. The near-resonant configuration presents the opportunity
to measure the planet’s mass via TTV measurements and to bypass difficult RV
measurements. Measuring the masses of the planets in this system will allow us
to test theoretical models of atmospheric mass loss.
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