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

Tue 10 Nov · 14:15

Huxley Building, South Kensington Campus

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About This Event

Mari-Liis Aru will present at the Astrophysics Weekly Seminar on 10 November 2026, discussing the effects of external photoevaporation on protoplanetary disks. The talk will explore how UV radiation from massive stars influences disk evolution.

The evolution of protoplanetary disks is influenced by a combination of internal processes linked to the central star, and external influences from the surrounding environment. Both pathways produce photoevaporative winds that drive disk dispersal from opposite directions. In star clusters, the UV radiation from massive OB stars irradiates disks externally, strongly affecting disk sizes, masses, and survival timescales. Until recently, the same emission lines were used for studying both internally and externally driven photoevaporative winds. However, disentangling the winds is essential for interpreting spectroscopic observations and completing models of disk evolution. In this talk, I will give an overview of the recent studies on externally irradiated disks—proplyds, in the Orion Nebula Cluster (ONC) with a focus on a spatially resolved dataset acquired with VLT/MUSE. I will present results in our effort to identify signatures unique to external photoevaporation, including a comparison of ONC sources with those in low-mass star-forming regions, and discuss tracers which open new windows into researching proplyds.

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Frequently asked questions

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

Astrophysics Weekly Seminar: Mari-Liis Aru – Under UV Pressure: Imprints of external photoevaporation on protoplanetary disks is held at Huxley Building, South Kensington Campus in London (711C, Huxley Building, SW7 2AZ).

Entry to Astrophysics Weekly Seminar: Mari-Liis Aru – Under UV Pressure: Imprints of external photoevaporation on protoplanetary disks is free.

The forecast for Astrophysics Weekly Seminar: Mari-Liis Aru – Under UV Pressure: Imprints of external photoevaporation on protoplanetary disks is Overcast · 11°C.

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