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VERSION:2.0
PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
BEGIN:VEVENT
UID:69db2cd29e2a2
DTSTAMP:20260412T012538
DTSTART:20171026T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20171026T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/787628-magnetism-in-s
 tar-planet-systems-from-dynamo-effect-to-stellar-wind-antoine-strugarek-ce
 asaclay
LOCATION:Pavillon Roger-Gaudry \, 2900\, boul. Édouard-Montpetit\, Local M
 -415\, Montréal\, QC\, Canada
SUMMARY:Magnetism in star-planet systems: from dynamo effect to stellar win
 d - Antoine Strugarek (CEA/Saclay)
DESCRIPTION:Résumé:
The magnetic field of solar-like\, cool stars shapes 
 their corona and astrosphere and can lead to intriguing magnetic interacti
 ons with close-in planets. Such stellar magnetic fields are thought to be 
 sustained by a dynamo process operating in their internal turbulent convec
 tive regions. They are generally observed to be variable in time\, as it i
 s the case for the Sun with its mysterious magnetic cycle of 11 years. A d
 ynamical dynamo field naturally triggers a dynamical corona. Close-in exop
 lanets around magnetic stars are thus likely to be subject to a strongly v
 arying magnetic interaction\, which can lead to potentially observable emi
 ssions\, planetary evaporation\, or even planet migration due to magnetic 
 torques. I will present here a series of work tackling the various aspects
  of the magnetism of a star and its environment\, based on massively paral
 lel numerical simulations using various magnetohydrodynamics formulations.
  I will first give a brief tour of our understanding of the origin of the 
 cyclicality of solar-like magnetic fields\, and present very recent result
 s showing a systematic modulation of the cycle period with the global para
 meters of the modelled star (rotation\, luminosity. Then\, I will present 
 state-of-the-art 3D numerical simulations of stellar winds capable of usin
 g observed (or modelled) complex and time-varying magnetic topologies. I w
 ill finally explore the implication of stellar magnetism on close-in plane
 ts using global 3D models of star-planet systems. I will lay out the basic
  principles behind magnetic star-planet interaction\, which resemble plane
 t-satellite interactions. I will conclude with a series of numerical simul
 ations that can be used to parametrize the observable effects of the magne
 tic interaction\, and as a result can help constraining the hypothetical m
 agnetic field of close-in exoplanets.
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TZID:America/Montreal
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