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UID:77@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260528T110000
DTEND;TZID=Europe/Paris:20260528T120000
DTSTAMP:20260508T073120Z
URL:https://osups.universite-paris-saclay.fr/calendrier/observational-tren
 ds-in-planet-formation/
SUMMARY:Observational trends in planet formation
DESCRIPTION:Par Simon Casassus (Université du Chili)\n\nRésumé :\nMost o
 f the fine structure seen in young circumstellar disks\, or protoplanetary
  disks\, is often attibuted to gravitational interactions with compact bod
 ies\, some as small superearths. Hydrodynamical models satisfactorily acco
 unt for the observations\, thus yielding constraints on the embedded plane
 tary systems and their environmental conditions. However\, the same observ
 ations raise questions on the actual process leading to planet formation a
 nd on the scarcity of the putative protoplanets. Although only a handful o
 f directly imaged candidate protoplanets exist\, most are Halpha sources\,
  indicative of accretion. Among these\, PDS70c stands out as the only exam
 ple known to have a radio counterpart. In contrast to optical measurements
 \, which are affected by extinction\, the radio signal directly probes the
  protoplanetary environment\, provided the emission mechanisms are known. 
 The multi-frequency and variability data available in PDS70c are particula
 rly informative. These data rule out thermal emission from a dusty environ
 ment\, and instead link the radio signal from PDS70c to a standing shock a
 t the surface of a circumplanetary disk.\n&nbsp\;\n\nLieu : IAS\, bât. 12
 1\, salle 1-2-3\n\n&nbsp\;
CATEGORIES:Séminaires
LOCATION:IAS\, Bât. 121 rue Jean Teillac\, Orsay\, 91400\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Bât. 121 rue Jean Teillac\
 , Orsay\, 91400\, France;X-APPLE-RADIUS=100;X-TITLE=IAS:geo:0,0
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DTSTART:20260329T030000
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