# Astrophysics Weekly Seminar: Mari-Liis Aru – Under UV Pressure: Imprints of external photoevaporation on protoplanetary disks

Astrophysics Weekly Seminar: Mari-Liis Aru – Under UV Pressure: Imprints of external photoevaporation on protoplanetary disks at Imperial College London, Tuesday 10 November 2026, 14:15.

- Price: Free
- Venue: Imperial College London, Exhibition Road, SW7 2AZ London
- With: Mari-Liis Aru
- Go to page: https://www.imperial.ac.uk/events/216273/astrophysics-weekly-seminar-mari-liis-aru-under-uv-pressure-imprints-of-external-photoevaporation-on-protoplanetary-disks/

An astrophysics seminar in Imperial College London's weekly series. Mari-Liis Aru talks about how UV radiation from massive stars in star clusters photoevaporates protoplanetary disks from outside, affecting their sizes, masses and survival. Using a spatially resolved dataset of proplyds in the Orion Nebula Cluster taken with VLT/MUSE, she presents efforts to identify signatures unique to external photoevaporation, including comparisons with low-mass star-forming regions, and discusses new tracers for researching proplyds.

## Dates

- Tuesday 10 November 14:15 — Imperial College London

Written by a model, sources: [imperial.ac.uk](https://www.imperial.ac.uk/events/216273/astrophysics-weekly-seminar-mari-liis-aru-under-uv-pressure-imprints-of-external-photoevaporation-on-protoplanetary-disks/)

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