Post-main-sequence stellar evolution
The set of late stellar life-stages — red giant, asymptotic giant branch (AGB), planetary nebula, white-dwarf — that follow the exhaustion of core hydrogen burning on the main sequence.
Relevance to UAP / astrobiology vault
- Planet survival: inner planets are typically engulfed or destabilized as the host star expands and loses mass; outer planets can migrate or remain bound at wider orbits.
- Atmosphere evolution: surviving giant planets retain their formation-era chemistry but are reshaped by changing irradiation and mass-loss exposure.
- Observational benchmark: wd-0806b — a cold giant in a 2,500 AU orbit around a white dwarf — is a direct probe of how giant-planet composition reflects the formation-and-evolutionary history of the whole system. See src-aas-nova-wd-0806b-atmosphere-2026-04.