#exoplanetary — Public Fediverse posts

From Misaligned Sub-Saturns to Aligned Brown Dwarfs - The Highest Mp/M* Systems Exhibit Low Obliquities, Even around Hot Stars: https://iopscience.iop.org/article/10.3847/2041-8213/adc129 -> To Be or Not to Be Aligned - Exploring Spin–Orbit Alignment Trends for #Exoplanetary Systems: https://aasnova.org/2025/05/02/to-be-or-not-to-be-aligned-exploring-spin-orbit-alignment-trends-for-exoplanetary-systems/

The search for #exoplanets has revealed a diversity of #planetary system architectures, the vast majority of which diverge significantly from the #solar system.

Giant #planets beyond the snow line are relatively rare, placing the solar system within a small category of systems with multiple giant planets at large separations.

An #exoplanetary system of note is that of HD 141399 that harbors four giant planets with separations extending to 4.5 AU.

#astronomy
https://arxiv.org/abs/2310.00860

Searching for Novel Chemistry in #Exoplanetary Atmospheres using Machine Learning for Anomaly Detection: https://arxiv.org/abs/2308.07604 -> "We advocate the application of machine learning (ML) techniques for anomaly (novelty) detection to exoplanet transit spectra, with the goal of identifying planets with unusual chemical composition and even searching for unknown biosignatures."

Impact of Changing Stellar and Planetary Magnetic Fields on (Exo)planetary Environments and Atmospheric Mass Loss: https://iopscience.iop.org/article/10.3847/1538-4357/acd93b -> Of #exoplanetary atmospheres, magnetism and stellar winds
and why planets may have wings: http://www.cessi.in/spi2023/

The JWST Early Release Science Program for Direct Observations of #Exoplanetary Systems - a 1 to 20 Micron Spectrum of the Planetary-Mass Companion VHS 1256-1257 b: https://arxiv.org/abs/2209.00620 -> Weather report - expect scattered, patchy clouds made up of silicates on planet VHS 1256 b: https://webbtelescope.org/contents/news-releases/2023/news-2023-105 and https://www.nasa.gov/feature/goddard/2023/nasa-s-webb-spots-swirling-gritty-clouds-on-remote-planet and https://www.mpia.de/news/science/2023-04-vhs1256b

Framework for the architecture of #exoplanetary systems - I. Four classes of #planetary system architecture / II. Nature versus nurture - emergent formation pathways of architecture classes: https://www.aanda.org/articles/aa/full_html/2023/02/aa43751-22/aa43751-22.html / https://www.aanda.org/articles/aa/full_html/2023/02/aa44705-22/aa44705-22.html -> Four classes of #planetarysystems: https://www.unibe.ch/news/media_news/media_relations_e/media_releases/2023/media_releases_2023/four_classes_of_planetary_systems/index_eng.html

@mustapipa
"virtually all these stars are surrounded by #exoplanetary systems"!

If there is life on one or more of these exoplanets, at least we are save from "Independence Day"-like aliens: "45 million light-years away from Earth"

Physics is universal so they have no clue we are here. All they might know about earth is that the dominant species got extinct 20 mio years ago.

This galaxy NGC 1097 is located 45 million light-years away from Earth.

It has been observed with the new #VLT instrument #ERIS, showing the gaseous and dusty ring almost symmetrically around the centre of the #galaxy.

The dark clouds represent interstellar dust that prevents us from seeing the stars behind them whereas the brighter spots are areas of rapid #star formation.

And we know that virtually all these stars are surrounded by #exoplanetary systems.

#astronomy https://www.eso.org/public/images/ann22015a/