Whether the Sun is an ordinary G-type star is still an open scientific question.
astro-ph.SR
Posted inAstronomy & Telescopes, Habitable Zones, Radiation, Space Weather & Heliophysics, Status Report, Stellar Cartography
Analyzing the Morphology of Late-phase Stellar Flares From G-, K-, and M-type Stars
Stellar flares occasionally present a peak-bump light curve morphology, consisting of an initial impulsive phase followed by a gradual late phase. Analyzing this specific morphology can uncover the underlying physics […]
Posted inAstronomy & Telescopes, Habitable Zones, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography
A Homogeneous Catalog of Oscillating Solar-Type Stars Observed by the Kepler Mission and a New Amplitude Scaling Relation Including Chromospheric Activity
We present a homogeneous catalog of global asteroseismic parameters and derived stellar parameters for 765 Kepler main-sequence and subgiant stars.
Posted inAstronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Interstellar, Status Report
Free-floating Planetary Mass Objects In LDN 1495 From Euclid Early Release Observations
Context. Substellar objects, including brown dwarfs and free-floating planetary-mass objects, are a significant product of star formation.
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Origin & Evolution of Life, Status Report
Fine-tunings In Nucleosynthesis And The Emergence Of Life: Status And Perspectives
We discuss the fine-tunings of nuclear reactions in the Big Bang and in stars and draw some conclusions on the emergence of the light elements and the life-relevant elements carbon […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography
Exploring Coronal Abundances Of M dwarfs At Moderate Activity Levels
Main sequence stars of spectral types F, G, and K with low to moderate activity levels exhibit a recognizable pattern known as the first ionization potential effect (FIP effect), where […]
Posted inBrown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Interstellar, Status Report
Free-floating Planetary Mass Objects In LDN 1495 From Euclid Early Release Observations
Context. Substellar objects, including brown dwarfs and free-floating planetary-mass objects, are a significant product of star formation. Their sensitivity to initial conditions and early dynamical evolution makes them especially valuable […]
Posted inAstronomy & Telescopes, Biochemistry & Organic Chemistry, Brown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Status Report
The Diversity of Cold Worlds: A Blended-light Binary Straddling The T/Y Transition In Brown Dwarfs
We present the first brown dwarf spectral binary characterized with JWST: WISE J014656.66+423410.0, the coldest blended-light brown dwarf binary straddling the T/Y transition.
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report
Simple Molecules And Complex Chemistry In A Protoplanetary Disk: A JWST Investigation Of The Highly Inclined Disk d216-0939
While the number of detected molecules, particularly complex organic molecules, in the solid-state in astrophysical environments is still rather limited, laboratory experiments and astrochemical models predict many potential candidates.
Posted inIntelligence & Language, Science Fiction, SETI & Technosignatures, Status Report
Ringworlds And Dyson Spheres Can Be Stable
In his 1856 Adams Prize essay, James Clark Maxwell demonstrated that Saturn’s rings cannot be comprised of a uniform rigid body. This is a consequence of the two-body gravitational interaction […]