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SUMMARY:The scattered light of debris disks - Julien Milli\, IPAG
DTSTART:20230509T120000Z
DTEND:20230509T130000Z
UID:TALK200668@talks.cam.ac.uk
CONTACT:Dr Mathias Nowak
DESCRIPTION:Debris disks are analogues to the Kuiper belt in our solar sys
 tem and are detected around at least 20% of main sequence stars. Extreme a
 daptive optics instruments have revealed exquisite details on debris discs
 \, allowing to extract the optical properties of the dust particles such a
 s the phase function\, the degree of polarisation and the spectral reflect
 ance. These are three powerful diagnostic tools to understand the physical
  properties of the dust population : the size\, shape and composition of t
 he dust particles. This can inform us on the population of parent bodies\,
  also called planetesimals\, which generate those particles through collis
 ions.\nI will review here the disks where this information has been extrac
 ted\, what was inferred\, highlighting the differences and similarities be
 tween the dust properties in those systems. I will show how experimental p
 hysics but also numerical simulations and solar system science can instruc
 t the field of debris disk science on how to interpret the dust phase func
 tions. In my work at IPAG\, we try to reproduce the scattering properties 
 of the disk around HR4796\, using dust analogues measured in the lab. I wi
 ll also report on the recent detection of an analogue to the beta Pictoris
  system\, with a warped disk suggesting interactions with a giant planet o
 n a misaligned orbit. 
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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