Stellar rotation is closely linked to both age and magnetic activity. Through gyrochronology, it provides a means to estimate stellar ages and trace the evolution of planetary systems, and it […]
M-dwarf
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
A Search For Wide-orbit Planets Around M-dwarfs Using Deep MIRI 15-micron Images
Wide-orbit (>10 AU) gas giant planets shape the architecture of planetary systems, yet their occurrence rate remains poorly constrained.
![[L] The detrended and phase-folded RV time series of GJ 1132 b (top) and GJ 1132 c (bottom). Different draws of the Keplerian models from our posterior are superimposed in black. The different colored markers correspond to different RV time series. Binned data points are shown as red squares. [R] Phase-folded and detrended RV time series of LTT 3780 b (top) and LTT 3780 c (bottom). The best-fit Keplerian model is superimposed in black. The different colors and markers correspond to different RV time series. Binned data points are shown as red squares. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/04/Super-Earth-masses.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry, Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
Super-Earth Masses And Stellar Abundances From NIRPS Reveal Tentative Evidence For Water-rich Formation Around M Dwarfs
Tracing the compositional link between terrestrial super-Earths and their host stars provides clues to their dominant formation pathway. By constraining the stellar abundances of refractory elements, we can predict the […]
Posted inAnalog Studies, Astronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, Stellar Cartography
The JWST Search For Earth-Luna Analogs: Upper Limits On Exomoons And Refined Ephemerides For TOI 700 d And e
While no conclusive detections of exomoons have been reported to date, planet formation theories predict that satellites should be a common outcome of the collisional dynamics in early extrasolar systems.
Posted inExoplanets, -moons, -comets, Gas Giants, Icy Worlds, Status Report
POSEIDON II: The Anti-Aligned Orbit of the Warm Neptune TOI-1710 A b
We present an observation of the Rossiter-McLaughlin effect for the warm-Neptune system TOI-1710 obtained with the NEID spectrograph on the WIYN 3.5 m telescope.
Posted inAstrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Habitable Zones, Status Report
Upper Atmosphere Dynamics and Drivers of Volatiles Loss from Terrestrial-Type (Exo)Planets
Volatile loss from exoplanetary atmospheres and its possible implications for the longevity of habitable surface conditions is a topic of vigorous debate currently.
Posted inAstrogeology, Exoplanets, -moons, -comets, Status Report, Stellar Cartography
The Role Of Inner Disk Edges In Shaping Ultra-short-period Planet Systems Around Late M Dwarfs
Close-in rocky planets are the most common type of exoplanets around late M dwarfs, ranging from more temperate worlds to highly irradiated lava planets with molten surfaces, and many theoretical […]
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Press Release, Space Weather & Heliophysics, TRAPPIST-1
Resistive MHD Simulations of Stellar Wind-Magnetosphere Coupling in TRAPPIST-1e
Close-in terrestrial exoplanets around M dwarfs reside in dense, magnetized winds, where non-ideal plasma coupling can strongly affect how electromagnetic energy is redistributed within the dayside interaction region.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
TOI-4616 b: A Benchmark Earth-sized Planet Transiting A Nearby M4 Dwarf
Rocky exoplanets are particularly abundant around M-type stars. Their small radii and low luminosities provide favourable conditions for detecting transiting terrestrial planets and probing their atmospheric properties.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Mars, Status Report
Atmospheric Escape Rates from Mars – If it Orbited an Old M-Dwarf Star
Atmospheric escape is an important process that influences the evolution of planetary atmospheres. A variety of physical mechanisms can contribute to escape from an atmosphere, including thermal escape, ion escape, […]