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UID:23@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20250620T110000
DTEND;TZID=Europe/Paris:20250620T120000
DTSTAMP:20250617T183014Z
URL:https://osups.universite-paris-saclay.fr/calendrier/asteroseismology-a
 s-a-probe-of-angular-momentum-transport-in-stars-the-case-of-red-giants/
SUMMARY:Asteroseismology as a probe of angular momentum transport in stars:
  the case of red giants
DESCRIPTION:par Charlotte Gehan (IRAP)\n\nSalle RDC\, bât. 209D\n\nRésum
 é :\n\nUnderstanding how angular momentum (AM) is transported in stars re
 mains a major challenge. Indeed\, models are still unable to accurately re
 produce the internal rotation measurements that ave been obtained for thou
 sands of stars through space-based asteroseismology and tend to predict ro
 tation rates that are much faster than the measured values.This disagreeme
 nt indicates that significant AM transport is at work inside stars\, the p
 hysical mechanisms of which are not yet well understood. However\, rotatio
 n impacts the lifetime of stars by bringing more chemical elements into th
 e core\, which undergoes nuclear fusion reactions during the main-sequence
  evolution stage. Hence\, understanding AM transport is of crucial importa
 nce not only for stellar physics\, but also for fields relying on the prec
 ise and accurate determination of stellar ages\, such as exoplanetology an
 d Galactic archaeology. In this context\, red giants represent an ideal la
 boratory\, as the physical conditions are met in their interior to couple 
 pressure waves in the external envelope with gravity waves in the interior
 \, giving birth to so-called mixed oscillation modes. Such mixedmodes carr
 y direct information on the physical properties of the core\, offering the
  opportunity to probe the mechanisms that transport AM in this otherwise l
 argely inaccessible region. I will begin by reviewing our current understa
 nding of AM transport in red giants\, based on asteroseismic core rotation
  measurements and models. I will then present an innovative modelling appr
 oach that allows us to identify the regions inside red giants from which A
 M is mostly extracted\, which is crucial for eventually identifying the ph
 ysical mechanisms that are responsible for the AM transport.
CATEGORIES:Séminaires
LOCATION:IAS\, Bât. 121 rue Jean Teillac\, Orsay\, 91400\, France
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 , Orsay\, 91400\, France;X-APPLE-RADIUS=100;X-TITLE=IAS:geo:0,0
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