![Chemical clock relations for planet-hosting solar analogs, showing abundance ratios as a function of stellar age for [Y/Mg], [Y/Al], [Ba/Mg], [Ba/Al], [Sr/Mg], and [Y/(Mg+Al)/2]. Data points are color-coded by metallicity ([Fe/H]). Black lines show best-fit linear relations derived using Deming regression, accounting for uncertainties in both variables, and shaded regions indicate 1σ confidence intervals. All abundance ratios show statistically significant correlations with stellar age. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Planets-Around.png?resize=1200%2C720&ssl=1)
[astro-ph.EP] Context. Abundance ratios between elements synthesized on different nucleosynthetic timescales provide empirical chemical clocks for estimating stellar ages, but robust calibrations require homogeneous samples with precise stellar parameters and […]
Solar twin
![NASA’s James Webb Space Telescope’s observations of what is thought to be the first ever recorded planetary engulfment event revealed a hot accretion disk surrounding the star, with an expanding cloud of cooler dust enveloping the scene. Webb also revealed that the star did not swell to swallow the planet, but the planet’s orbit actually slowly decayed over time. This illustration depicts the sequence of events that took place over millions of years, based on observations from Webb’s MIRI (Mid-Infrared Instrument) and NIRSpec (NIR-Infrared Spectrograph). -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/A-Bayesian-Search.png?resize=1200%2C720&ssl=1)
Posted inExoplanets, -moons, -comets
A Bayesian Search for Planet Engulfment Signatures in Solar Analogs
[astro-ph.EP] We present a systematic Bayesian search for chemical fingerprints of planet engulfment in 113 solar twins and analogs with high-precision abundance measurements, 45 of which host known or candidate […]
Posted inAstronomy & Telescopes, Gaia Mission, Press Release, Stellar Cartography
Our Sun Escaped Together With Stellar Twins From Galaxy Center
Researchers have uncovered evidence for our Sun joining a mass migration of similar “twins” leaving the core regions of our galaxy, 4 to 6 billion years ago. The team created […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Status Report, Stellar Cartography
Solar Twins In Gaia DR3 GSP-Spec II. Age Distribution And Its Implications For The Sun’s Migration
Solar twins are among the most powerful tracers of Galactic disk evolution owing to their unique property of sharing nearly solar metallicities ([Fe/H] ~ 0) while spanning a wide range […]