Kavli Affiliate: Moritz Guenther
| First 5 Authors: Attila Varga, Joel H. Kastner, Alexander S. Binks, Hans Moritz Guenther, Simon J. Murphy
| Summary:
The mid-M star TOI~1227 hosts among the youngest known transiting exoplanets.
We have conducted new X-ray imaging and optical spectroscopic observations of
TOI 1227 aimed at ascertaining its age and the influence of its high-energy
radiation on the exoplanet, TOI 1227b. We obtained a definitive X-ray detection
of TOI 1227 with Chandra/HRC-I, and measured its Li and H$alpha$ lines using
ANU SSO 2.3 m telescope (WiFeS) spectroscopy. Through spatiokinematic,
isochronal, and SED-based modeling, we have constrained the age of TOI 1227 as
lying between 5 Myr and 12 Myr, with a best estimate of $sim$8 Myr. In the
context of this age, we model the evolution of the transiting exoplanet TOI
1227b, using the X-ray luminosity derived from Chandra HRC-I imaging. Our
modeling suggests that TOI 1227b is currently undergoing rapid atmospheric mass
loss at rates on the order of $sim 10^{12}$ g s$^{-1}$. The modeling
demonstrates that the exoplanet’s predicted future evolution depends
sensitively on assumptions for total and core planet mass, highlighting the
importance of follow-up observations of the TOI 1227 star-exoplanet system to
enable measurements of both planetary mass and mass-loss rate.
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