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coronal temperature 1eROSITA 1fgk stars 1Gaia kinematics 1pre-main sequence stars 1rtv scaling law 1stellar coronae 1stellar magnetic activity 1x-ray astronomy 1x-ray surveys 1young stellar associations 1

From the 2 of 4 linked papers with an AI index.

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20242026
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astro-ph.EP2025

The Age and High Energy Environment of the Very Young Transiting Exoplanet TOI 1227b

Attila Varga, Joel H. Kastner, Alexander S. Binks +2

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 ascert…