![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)
[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 […]
solar analog
![Elemental [X/Fe] abundances derived in this work as a function of stellar age. The solid orange lines show the best-fit linear age–abundance relations derived in this work, and the dotted grey lines show the corresponding relations from M. Bedell et al. (2018) for comparison. -- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/The-Sun.png?resize=1200%2C718&ssl=1)
Posted inStellar Cartography
The Sun’s Chemical Peculiarity: Disentangling Galactic Chemical Evolution And Planetary Engulfment In Solar Twins
[astro-ph.SR] Recent observational studies have suggested that the Sun may be chemically peculiar relative to the majority of solar twins.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Status Report
HARPS-N, TESS, and CHEOPS Discover A Transiting Sub-Neptune And Two Outer Companions Around The Bright Solar Analogue HD 85426
We provide a detailed characterisation of the planetary system orbiting HD 85426 (TOI-1774).
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Press Release
The HD 60779 Planetary System: A Transiting Sub-Neptune On A 30-day Orbit And A More Massive Outer World
We present the discovery of the planetary system orbiting the bright (V = 7.2), nearby (35 pc), Sun-like star HD 60779, which has a mass of 1.050 +/- 0.044 solar […]
![Comparison of elemental abundances from the literature and this work (filled circles) for the same stars. The y-axis shows the difference in abundance, [X/H]literature – [X/H]this work, plotted against the Tc of each element on the x-axis. Potassium (K) is excluded as it was not reported in the literature. The open squares and downward triangles show a direct comparison of abundances measured from HARPS and MIKE spectra using the same spectral lines and analysis methods applied in this study. The differences reflect both instrumental systematics and manual measurement variability between HARPS and MIKE. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/08/Planets-Around-Solar-TwinsAnalogs.png?resize=1200%2C720&ssl=1)
Posted inAnalog Studies, Astrochemistry, Astrogeology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Planets Around Solar Twins/Analogs (PASTA) II: Chemical Abundances, Systematic Offsets, And Clues To Planet Formation
Context. Previous studies have suggested that the Sun is relatively depleted in refractory elements compared to other solar twins or analogs, potentially as a result of planet formation. However, such […]
![Distribution of [Fe/H] versus age for the stars of our sample, distinguished by the possible subgroups. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/06/Signatures-Of-Planets-And-Galactic.png?resize=1200%2C718&ssl=1)
Posted inAI - 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
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 […]