Optimistic (light green) and conservative (dark green) habitable zone for 1 M⊕ according to Kopparapu et al. (2014). Teegarden’s Star planets b and c are shown for two stellar parameter sets (red dots: Schweitzer et al. 2019; blue dots: Rojas-Ayala et al. 2012; Dieterich et al. 2014). The insolation error bar depicts the effect due to intrinsic uncertainty in Teff. For comparison, we plot nine planets (including Proxima b and TRAPPIST-1 e, f, and g) from the Habitable Exoplanet Catalog12 (black circles) and the Earth (black circled plus) at the top. All symbol sizes scale with the fourth power of the Earth Similarity Index (ESI) assuming a rocky composition.
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