Ages and X-Ray-FUV Irradiances of the Earth-size, Habitable Zone Planets Orbiting Teegarden’s Star

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Abstract
Two of the most promising, potentially habitable and nearby exoplanets orbit Teegarden’s Star, a M7V red dwarf, only 12.5 lt-yr away. We determine the ages and the photoionizing and photodissociating X-ray/FUV (XUV) irradiances of these rocky, habitable zone (HZ) Earth-size exoplanets: Teegarden-b: M sin i ( M ⊕ ) = 1.16 ; T eq (K) = 277 and Teegarden-c: M sin i ( M ⊕ ) = 1.11 ; T eq ( K ) = 209 . Teegarden-d was recently reported well beyond the outer edge of the HZ. Age is estimated from the star’s rotation (gyrochronology), UVW space-motions, Activity–Age relations and metallicity. A weighted mean age ∼7.4 ± 1.8 Gyr is determined. The XUV irradiances are compared to Proxima-b and the TRAPPIST-1 system. These planetary XUV irradiances are important since they strongly affect the hosted planets’ ability to retain atmospheres and water inventories crucial for life.

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