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SUMMARY:Exocometary gas in debris disks - Luca Matra (Cambridge)
DTSTART:20170215T160000Z
DTEND:20170215T170000Z
UID:TALK69717@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:Recent discovery of exocometary gas in extrasolar Kuiper belts
  has opened the field of exocometary science. Comets carry the basic volat
 iles required for the development of life as we know it\, meaning that you
 ng exocometary belts provide a unique window into volatile delivery to roc
 ky planets in the final stages of their formation. In this talk\, I will s
 how how exocometary gas detection and volatile characterisation are now po
 ssible\, thanks to the advent of sensitive observatories such as ALMA.\nIn
  particular\, I will present modelling and observational work aimed at det
 ecting low levels of molecular gas and determine its exocometary origin\, 
 focusing on the belts around nearby stars Fomalhaut and beta Pictoris. I w
 ill show how to derive gas masses and translate them to cometary abundance
 s\, allowing a first comparison of the volatile reservoir of exoplanetary 
 systems to that of our own Solar System\, already indicating similarity. F
 inally\, I analyse the resolved structure of the observed gas and compare 
 it to predictions from dynamical models.\nTo conclude\, I will propose dir
 ections in which to develop the field in order to better understand the vo
 latile composition\, origin and properties of exocometary belts around nea
 rby stars.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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