On the Habitability of Teegarden's Star planets

Abstract

We study the habitability of the two 1-2 Earth-mass planets, recently detected by the CARMENES collaboration, around the ultra-cool nearby M dwarf Teegarden's Star. With orbital periods of 4.9 and 11.4 days, both planets are likely to be within the Habitable Zone and tidally locked. They are among the most Earth-like exoplanets yet discovered. Applying an analytical habitability model we find that surface liquid water could be present on both planets for a wide range of atmospheric properties, which makes them attractive targets for bio-signature searches. The prospects of the planets retaining such an atmosphere over their history are discussed.

arXiv comment7 pages, 2 figures, published in ApJL

References in corpus (27)

• Extreme Water Loss and Abiotic O${}_2$ Buildup On Planets Throughout the Habitable Zones of M Dwarfs
• Stabilizing Cloud Feedback Dramatically Expands the Habitable Zone of Tidally Locked Planets
• A Re-appraisal of the Habitability of Planets Around M Dwarf Stars
• The habitability of Proxima Centauri b II. Possible climates and Observability
• The inner edge of the habitable zone for synchronously rotating planets around low-mass stars using general circulation models
• 3D climate modeling of close-in land planets: Circulation patterns, climate moist bistability and habitability
• Modeling Repeated M-dwarf Flaring at an Earth-like Planet in the Habitable Zone: I. Atmospheric Effects for an Unmagnetized Planet
• Assessing the Habitability of the TRAPPIST-1 System Using a 3D Climate Model
• Atmospheric escape from the TRAPPIST-1 planets and implications for habitability
• The CARMENES search for exoplanets around M dwarfs: Different roads to radii and masses of the target stars
• Asynchronous rotation of Earth-mass planets in the habitable zone of lower-mass stars
• High Stellar FUV/NUV Ratio and Oxygen Contents in the Atmospheres of Potentially Habitable Planets
• Tidal obliquity evolution of potentially habitable planets
• Is Proxima Centauri b habitable? -- A study of atmospheric loss
• The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star
• Habitable Climate Scenarios for Proxima Centauri b With a Dynamic Ocean
• Thermal phase curves of nontransiting terrestrial exoplanets 1. Characterizing atmospheres
• Habitability of Terrestrial-Mass Planets in the HZ of M Dwarfs. I. H/He-Dominated Atmospheres
• Temperature Structure and Atmospheric Circulation of Dry, Tidally Locked Rocky Exoplanets
• Water Trapping on Tidally Locked Terrestrial Planets Requires Special Conditions
• No snowball on habitable tidally locked planets
• The Potential of Planets Orbiting Red Dwarf Stars to Support Oxygenic Photosynthesis and Complex Life
• On the Stability of Super-Earth Atmospheres
• On the protection of extrasolar Earth-like planets around K/M stars against galactic cosmic rays
• Reduced Diversity of Life Around Proxima Centauri and TRAPPIST-1
• On the bio-habitability of M-dwarf planets
• Revisiting the Biological Ramifications of Variations in Earth's Magnetic Field

Cited by in corpus (4)

• Flaring activity of Proxima Centauri from TESS observations: quasi-periodic oscillations during flare decay and inferences on the habitability of Proxima b
• Large Interferometer For Exoplanets (LIFE). X. Detectability of currently known exoplanets and synergies with future IR/O/UV reflected-starlight imaging missions
• New models of reflection spectra for terrestrial exoplanets: Present and prebiotic Earth orbiting around stars of different spectral types
• Near the Runaway: The Climate and Habitability of Teegarden's Star b