We investigate and compare the composition of M-dwarf planets in systems with only one known planet (“singles”) to those residing in multi-planet systems (“multis”) and the fundamental properties of their […]
M-dwarf
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Status Report
Company for the ultra-high density, ultra-short period sub-Earth GJ 367 b: discovery of two additional low-mass planets at 11.5 and 34 days
GJ 367 is a bright (V ≈ 10.2) M1 V star that has been recently found to host a transiting ultra-short period sub-Earth on a 7.7 hr orbit. With the […]
Posted inExoplanets, -moons, -comets, Habitable Zones, Status Report
Tidal Excitation Of The Obliquity Of Earth-like Planets In The Habitable Zone Of M-dwarf Stars
Close-in planets undergo strong tidal interactions with the parent star that modify their spins and orbits. In the two-body problem, the final stage for tidal evolution is the synchronisation of […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report
A 1.55 R⊕ Habitable-zone Planet Hosted By TOI-715, An M4 Star Near The Ecliptic South Pole
A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
HST/WFC3 Light Curve Confirms the Closest Exoplanet to Transit an M Dwarf is Terrestrial
Previous studies of the exoplanet LTT 1445Ac concluded that the light curve from the Transiting Exoplanet Survey Satellite (TESS) was consistent with both grazing and non-grazing geometries. As a result, […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
UV Spectral Characterization of Low-Mass Stars With AstroSat UVIT for Exoplanet Applications: The Case Study of HIP 23309
Characterizing rocky exoplanet atmospheres is a key goal of exoplanet science, but interpreting such observations will require understanding the stellar UV irradiation incident on the planet from its host star.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Space Weather & Heliophysics, Status Report
The Space Weather Around The Exoplanet GJ 436b
The space environment in which planets are embedded depends mainly on the host star and impacts the evolution of the planetary atmosphere. The quiet M dwarf GJ 436 hosts a […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
TOI-2084 b and TOI-4184 b: Two New Sub-Neptunes Around M Dwarf Stars
We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, SED […]
Posted inAstrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Press Release, TRAPPIST-1, Venus, Water/Hycean Worlds & Oceanography
Exoplanet LP 890-9c May Reveal Secrets About The Edge Of Habitability
How close can a rocky planet be to a star, and still sustain water and life? A recently discovered exoplanet may be key to solving that mystery.
Posted inAtmospheres, Climate, Weather, Biosignatures & Paleobiology, Extinction events, Habitable Zones, Press Release, Venus
Venus Atmosphere In 3D Prepares Future Observations Of Rocky Exoplanets
The Venus atmosphere may be used as a natural laboratory to understand the evolution of Earth-like planets, according to a study led by the Instituto de Astrofísica e Ciências do […]