Solar Analogs Archives - Astrobiology

log R′HK(Teff) as a function of age for solar twins and solar analogs. Blue squares represent the six new seismic solar analogs listed in Table 1. Orange, dark-gray, and light-gray circles correspond to stellar samples from the literature, as indicated in the legend. The dashed line shows the empirical relation from Lorenzo-Oliveira et al. (2018). The green shaded region represents the 2σ uncertainty envelope around this relation. The Sun is represented by its red symbol. -- astro-ph.SR

Astronomy & Telescopes, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography

Characterizing Six Seismic Solar Analogs Observed By Kepler, K2, And HERMES

by Keith CowingMay 3, 2026May 3, 2026

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.

Distribution of [Fe/H] versus age for the stars of our sample, distinguished by the possible subgroups. -- astro-ph.SR

AI - Data - Apps - Cybernetics, Analog Studies, Astrochemistry, Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography

Signatures Of Planets And Galactic Subpopulations In Solar Analogs. Precise Chemical Abundances With Neural Networks

by Keith CowingJune 27, 2025June 27, 2025

The aim of this work is to obtain precise atmospheric parameters and chemical abundances automatically for solar twins and analogs to find signatures of exoplanets, as well as to assess […]

Mean abundance measurements of our sample with standard errors of the means (standard deviation divided by square root of number of stars) as a function of condensation temperature compared to the Sun. Top: All test set solar analogs as navy filled circles and identified planet hosts as orange hexagons. The Sun appears relatively refractory depleted with increasing condensation temperature compared to these samples replicating Bedell et al. (2018), and the solar analogs and planet hosts are chemically indistinguishable within 2-3σ. Bottom: All test set solar analogs as navy filled circles, close-in giant planet hosts as purple unfilled circles, giant planet hosts as pink unfilled diamonds, and terrestrial/small planet hosts as green unfilled squares. The Sun still appears relatively depleted compared to these four samples, which are still chemically indistinguishable within 2-3σ. -- astro-ph.SR

Astrogeology, Astronomy & Telescopes, Exoplanets, -moons, -comets, Gaia Mission, Space Weather & Heliophysics, Status Report, Stellar Cartography

The Sun Remains Relatively Refractory Depleted: Elemental Abundances for 17,412 Gaia RVS Solar Analogs and 50 Planet Hosts

by Keith CowingFebruary 28, 2024November 16, 2024

The elemental abundances of stars, particularly the refractory elements (e.g., Fe, Si, Mg), play an important role in connecting stars to their planets.

HD 283572 Flares - HSCFA

Exoplanets, -moons, -comets, Habitable Zones, Press Release, Radiation, Space Weather & Heliophysics

Extreme Eruption on Young Sun-like Star Signals Savage Environment for Developing Exoplanets

by Keith CowingFebruary 7, 2024February 7, 2024

Astronomers have detected an extreme eruption from a young star that became more than a hundred times brighter in only a few hours.

True N2-dominated planet-to-star flux ratio spectrum with an assumed S/N = 20 (red) plotted against 1000 randomly sampled retrieved spectra with 95% confidence intervals. The blue spectrum is the median spectrum created from the 1000 plotted model runs that make up our confidence interval. -- astro-ph.EP

Astrochemistry, Astrogeology, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report

Constraining Background N2 Inventories On Directly Imaged Terrestrial Exoplanets To Rule Out O2 False Positives

by Keith CowingNovember 24, 2023November 24, 2023

Direct imaging spectroscopy with future space-based telescopes will constrain terrestrial planet atmospheric composition and potentially detect biosignature gases. One promising indication of life is abundant atmospheric O2.

Mass-radius diagram. The green circles show the exoplanet data from exoplanets.eu, the black stars show the Solar System planets and the blue and orange points show the measured values for TOI-1736 b and TOI-2141 b, respectively. Several models from Zeng et al. (2019) are also plotted for comparison. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report

TOI-1736 and TOI-2141: Two Systems Including Sub-Neptunes Around Solar Analogs Revealed By TESS And SOPHIE

by Keith CowingNovember 15, 2023November 15, 2023

Planetary systems around solar analogs inform us about how planets form and evolve in Solar System-like environments. We report the detection and characterization of two planetary systems around the solar […]

Habitable Zones, Press Release

Evolution of Long Term Variability in Solar Analogs

by Keith CowingApril 10, 2017

Earth is the only planet known to harbor life, therefore we may speculate on how the nature of the Sun-Earth interaction is relevant to life on Earth, and how the […]