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SUMMARY:The Response and Observability of Exo-Earth Climates to Cometary I
 mpacts - Felix Sainsbury-Martinez (Leeds)
DTSTART:20250610T120000Z
DTEND:20250610T130000Z
UID:TALK227290@talks.cam.ac.uk
CONTACT:Dr Dolev Bashi
DESCRIPTION:Impacts by icy bodies likely played a key role in shaping the 
 composition\, and habitability\, of Solar-System planets. We determine the
  role they may play in exoplanetary systems by coupling a cometary impact 
 model with a 3D\, Earth-analogue\, climate model. I will discuss how both 
 the impact-delivered water and thermal energy affects the global climate a
 nd composition\, including: i) a modified cloud greenhouse effect and plan
 etary albedo\, ii) an enhancement in the abundance of most oxygen-bearing 
 molecules (bar ozone)\, and iii) an enhancement in the escape rate of hydr
 ogen from the exosphere. I will describe how these responses are shaped by
  atmospheric circulations driven by the planetary orbital configuration\, 
 including the role that impact location plays in setting the vertical tran
 sport and hence hydrogen escape rate. Finally\, I will quantify the potent
 ial observability of individual massive impacts in future observations of 
 exo-Earths. \n
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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