The PLATO mission is scheduled for launch in December 2026. It is an ESA M-class mission designed to find small planets around bright stars via the transit technique.
astro-ph.SR
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
Short-Term Balmer Line Emission Variability in M Dwarfs
M Dwarfs make up the majority of stars, offering an avenue for discovering exoplanets due to their smaller sizes. However, their magnetic activity poses challenges for exoplanet detection, characterization, and […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Status Report, Stellar Cartography
A Data-Driven M Dwarf Model and Detailed Abundances for ∼17,000 M Dwarfs in SDSS-V
The cool temperatures of M dwarf atmospheres enable complex molecular chemistry, making robust characterization of M dwarf compositions a long-standing challenge.
Posted inExoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics, Status Report, Stellar Cartography
X-ray Activity Of Nearby G-, K-, And M-type Stars And Implications for Planet Habitability Around M stars
Context. The intense X-ray and UV emission of some active M stars has raised questions about the habitability of planets around M-type stars. Aims. We aim to determine the unbiased […]
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Status Report, Stellar Cartography
ALMA Observations of CO Isotopologues Towards Six Obscured post-AGB Stars
Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB), when an efficient mass-loss process removes a significant fraction of their initial mass.
Posted inAstrochemistry, Astronomy & Telescopes, Biosignatures & Paleobiology, Brown Dwarfs, Exoplanets, -moons, -comets, Gaia Mission, Icy Worlds, Interstellar, Status Report, Water/Hycean Worlds & Oceanography
Water-Bearing Objects in the Core of the Rho Ophiuchi Cloud Complex
We present a study of very low-mass stars and brown dwarfs in the rich star-forming core of the Rho Ophiuchi cloud complex. The selection of the sample relies on detecting […]
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Space Weather & Heliophysics, Status Report
Enhancing The Detection Of Low-energy M Dwarf Flares: Wavelet-based Denoising Of CHEOPS Data
Stellar flares are powerful bursts of electromagnetic radiation triggered by magnetic reconnection in the chromosphere of stars, occurring frequently and intensely on active M dwarfs.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Exoplanets, -moons, -comets, Radiation, Space Weather & Heliophysics, Status Report
Modeling the astrosphere of LHS~1140
The cosmic ray (CR) flux, as well as the hydrogen flux into the atmosphere of an exoplanet, can change the composition of the atmosphere. Here, we present the CR and […]
![Illustration similar to that of Fig. 2 in Nimmo et al. (2020), demonstrating the sensitivity of core convection to changing concentrations of radiogenic elements (relative to the terrestrial amount), see Nimmo et al. (2020) for details on model parameters. Color scaled to represent net entropy production from radiogenic heating, with the black region representing negative production (no dynamo). Dashed red line represents the regime at [Eu/α]=0.08 where a dynamo failure lasting > 100 Myr first begins. Solid black lines represent contours of constant mantle temperature. astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/12/Distribution-of-Europium-in-The-Milky-Way-Disk.png?resize=1200%2C720&ssl=1)
Posted inAstrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biophysics, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Habitable Zones, Origin & Evolution of Life, Radiation, Status Report
Distribution of Europium in The Milky Way Disk; Its Connection to Planetary Habitability and The Source of The R-Process
The energy provided in the radioactive decay of thorium (Th) and uranium (U) isotopes, embedded in planetary mantles, sustains geodynamics important for surface habitability such as the generation of a […]
![The GCE-corrected, differential elemental abundance relative to the Sun ([X/Fe]solar - [X/Fe]star). The five solar twins with -0.1 < [Fe/H] < 0.1 dex, ∆ Teff < 100 K, ∆ log g < 0.1 are TOI-1055, TOI-2426, TOI-744, TOI-755, and TOI-818, are shown as gray symbols in the background, while the colored symbols show the average elemental abundance for these stars. Refractory elements are shown in orange, volatile elements are shown in blue symbols. Elements with Tc above 1300 K are considered refractory, with the threshold Tc of 1300 K shown by a dashed orange line. We fit a linear regression to the colored symbols while considering the error bars. The orange line displays the best linear fit to all the colored points, with the shaded blue band indicating the 1-σ confidence interval. The expression for the linear regression is -6.726e-05+2.320e−05 −2.342e−05 × Tc (K) + 0.086+0.030 −0.030. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/11/High-Precision-Stellar-Chemical-Abundance.png?resize=1200%2C719&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography
High Precision Stellar Chemical Abundance for 17 Planet-hosting Stars and the Condensation Temperature Trend
The Sun is depleted in refractory elements compared to nearby solar twins, which may be linked to the formation of giant or terrestrial planets.