Brown dwarfs are compact objects that do not reach temperatures high enough to produce sustained hydrogen fusion. Consequently, they cool over time, gradually evolving through later spectral types.
astro-ph.SR
Posted inAriel Mission, Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Missions & Hardware, Status Report, Stellar Cartography
Ariel Stellar Characterisation IV. Fundamental Parameters Of 18 Hot Stars In The Ariel Mission Candidate Sample
The characterisation of exoplanetary systems depends on the accurate determination of host star parameters.
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
The HAges Catalog: Stellar Ages For High Priority HWO Target Stars
Precise stellar ages (uncertainties ≲1 Gyr, or ∼20% at solar age) are required to discern evolutionary trends in atmospheric biosignatures of terrestrial habitable zone exoplanets surveyed by the Habitable Worlds […]
![The H2 and [Ne II] emission detected towards DoAr 25 on top of the ALMA 240 GHz continuum emission (shown in the background as a reddish-yellow image). The white central circle shows the inner working angle from JWST. In this case, the disk itself is seen in absorption against line emission from the Ophiuchus PDR for H2 S(1)-S(3) (17.03-9.66 µm). -- astro-ph.SR)](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/05/Characterizing-The-Extended.png?resize=1200%2C721&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Space Weather & Heliophysics, Status Report
Characterizing The Extended Molecular Hydrogen Winds In Protoplanetary Disks From The JWST Disk Infrared Spectroscopic Chemistry Survey
We present a comprehensive analysis of extended H2 emission from 34 protoplanetary disks observed with the JWST Disk Infrared Spectroscopic Chemistry Survey (JDISCS), supplemented by archival data.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Space Weather & Heliophysics, Status Report, TRAPPIST-1
A Single Power Law For The TRAPPIST-1 Flare Distribution Across Four Orders Of Magnitude In Energy
TRAPPIST-1 is an ultra-cool dwarf that flares frequently. These flares shape the surrounding planets’ high-energy irradiation environments, with consequences for atmospheric chemistry and escape, and they can contaminate transmission spectroscopy […]
Posted inAstronomy & Telescopes, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography
Characterizing Six Seismic Solar Analogs Observed By Kepler, K2, And HERMES
Solar analogs, stars that closely match the fundamental properties of the Sun, provide key benchmarks for testing stellar structure and evolution across different ages and activity levels.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Status Report, Stellar Cartography
The POKEMON Speckle Survey of Nearby M dwarfs. IV. Distance-Limited Catalog (POKEMON-DLC)
The Solar Neighborhood is dominated by stars smaller, colder, and fainter than the Sun: the M dwarfs.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, PLATO, Status Report, Stellar Cartography
Variability Classification Of TESS Targets in LOPS2, The First Long-term Pointing Field Of PLATO. Version 1 of The Public Variability Catalogue
The PLAnetary Transits and Oscillations of stars (PLATO) mission is expected to launch in January 2027. A total of 8\% of its data rate will be dedicated to complementary science […]
Posted inAstronomy & Telescopes, Citizen Science / Open Science, Imaging & Spectroscopy, Interstellar, Status Report, Stellar Cartography
Three Thousand Motion-Confirmed L and T Dwarf Candidates From The Backyard Worlds: Planet 9 Citizen Science Project
The Backyard Worlds: Planet 9 citizen science project uses data from the Wide-field Infrared Survey Explorer to detect infrared objects with significant motion.
Posted inBrown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Status Report
The Coldest Known Y Dwarfs: Estimates of their Effective Temperatures
For a decade there has been a factor of 2.5 gap in luminosity between the 275K WISE J085510.83-071442.5 (Luhman 2014) and all other Y dwarfs, with Teff >= 350K. Recently […]