M dwarfs are prime targets for exoplanet searches due to their low masses and radii, which enable the detection of small planets in their habitable zones (HZs).
astro-ph.SR
Posted inBiosignatures & Paleobiology, Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report
Stellar Engines And Dyson Bubbles Can Be Stable
A range of speculative space ventures envisage the use of ultra-large structures for the collection and reflection of light.
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
The GAPS Programme At The TNG: LXX. TOI-5734b: A Hot Sub-Neptune Orbiting A Relatively Young K Dwarf With An Earth-like Density
Increasing interest in young exoplanets is leading to a growing effort to understand the formation and evolutionary processes responsible for their different architectures. One interesting target is TOI-5734, a relatively […]
Posted inAlpha Centauri, Astronomy & Telescopes, Status Report, Stellar Cartography
A Mapping Method Of Age Estimation For Binary Stars: Application To The Alpha Centauri System A And B
Given the wealth of data provided by Gaia and the upcoming PLATO mission, it is essential to improve stellar models to obtain accurate stellar ages. Our objective is to apply […]
Posted inAnalog Studies, Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Icy Worlds, Imaging & Spectroscopy, Interstellar, Status Report
Broadband Infrared Spectroscopy Of Methanol Isotopologues In pure, H2O-rich, And CO-rich Ice Analogues
Deuterium fractionation is highly efficient during the early stages of star formation, particularly in starless and prestellar cores where temperatures are low (<10 K) and molecular freeze-out onto dust grains […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
Stellar And Orbital Characterization Of Three Low Mass M Dwarf Binary Stars With Dynamical Spectroscopy From The Habitable Zone Planet Finder
Contrast curves and reconstructed images from the NESSI speckle imager for a: LSPM 0515+5911, b: NLTT 45468, and c: NLTT 43564. Neither LSPM 0515+5911 nor NLTT 43564 show companions within […]
![Probability distribution functions (PDFs) for the chemical abundances used to sample the stellar properties in our dataset,with lighter colors indicating higher probability densities. Left panel: PDF of [C/Fe] versus [Fe/H]. Right panel: PDF of [α/Fe] versus [Fe/H]. In both panels, the pink contours show the abundance distributions of halo stars from the APOGEE survey, as provided by the astroNN catalog. APOGEE does not reach the lowest metallicities present in our simulated dataset, which explains the differences at low [Fe/H]. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/01/Towards-Model-free.png?resize=1200%2C723&ssl=1)
Posted inAI - Data - Apps - Cybernetics, Astrochemistry, Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Towards Model-free Stellar Chemical Abundances. Potential Applications In The Search For Chemically Peculiar Stars In Large Spectroscopic Surveys
Chemical abundance determinations from stellar spectra are challenged by observational noise, limitations in stellar models, and departures from simplifying assumptions.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Radiation, Space Weather & Heliophysics, Status Report, tau Ceti
HST Observations of HD 166620 and Tau Ceti: First UV Spectra of a Magnetic Grand Minimum Star and the Extent of Tau Ceti’s Astrosphere
We present new Hubble Space Telescope (HST) UV spectra of the K2 V star HD 166620, the first star clearly recognized to be in a “magnetic grand minimum” state analogous […]
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Interstellar, Status Report
Identification Of Solid N2O In Interstellar Ices Using Open JWST Data
Context. There are only six molecules containing N-O bond that are detected in gaseous phase in interstellar medium. One of those is nitrous oxide (N2O), which was searched for but […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, Stellar Cartography
Paving the Road to the Habitable Worlds Observatory with High-Resolution Imaging I: New and Archival Speckle Observations of Potential HWO Target Stars
One of the key goals of the Habitable Worlds Observatory (HWO) is to directly image about 25 potentially habitable exoplanets and determine their properties.