X-ray impact on planet formation

Date: 
Wednesday, February 26, 2020 - 3:30pm PST
Speaker: 
Lisseth Gavilan Marin
Affiliation: 
NASA Ames
Location: 
N232 R227
Event Type: 
Colloquium

In addition to UV radiation, young T Tauri stars emit copious amounts of X-rays that impinge on dust during the mega-year lifetimes of protoplanetary disks. Yet, unlike UV photons, X-rays have longer penetration depths in solids and can deposit more energetic secondary electrons, potentially activating new chemical pathways in dust grains. These could lead to dust growth, and could significantly impact the primordial stages of planet formation. However, such processes remain largely unknown due to a lack of fundamental X-ray photochemical data.

In this talk, I will present our recent experimental work using silicate and carbonaceous nanoparticles exposed to soft and hard X-rays, and what we can learn from infrared, structural, and isotopic microprobes. I will present how the laboratory infrared spectra can be compared to SOFIA  FORCAST/FIFI spectra and how X-ray/IR multiwavelength observations can enhance our understanding of dust evolution in planet forming disks.

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