The 365 Days of Astronomy EVSN - Asteroid Destruction, Brown Dwarf Formation & Getting Science From Dust
Dec 19, 2025
Discover how the YORP effect might spin asteroids to their doom in dying star systems. Learn about the differences in formation between giant planets and brown dwarfs, and how the latter show eccentric orbits that suggest a stellar origin. Plus, delve into a groundbreaking technique that analyzes lunar and planetary dust at atomic levels, unlocking secrets of water and helium. Tune in for these cosmic mysteries and more!
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YORP Can Shred Asteroids Around Dying Stars
- The YORP effect can spin asteroids to breakup speeds when a star becomes a luminous giant.
- Models predict most asteroids shrink to 1–100 meters and create observable debris disks around white dwarfs.
Warwick Models Predict Massive Asteroid Breakup
- The University of Warwick models show stellar luminosity increases by 1,000–10,000 during giant phases and can spin asteroids to one rotation per two hours.
- Rubble-pile asteroids will fly apart while mid-sized bodies undergo repeated breakups down to small fragments.
Debris Disks Pollute White Dwarfs
- Debris from shredded asteroids should produce disks that evolve and pollute white dwarf atmospheres.
- These pollution signatures are observable and test the model's predictions.