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SUMMARY:Sleeping beasts: magnetic fields shape observational manifestation
 s of neutron stars - Andrei Igoshev - University of Leeds
DTSTART:20201026T140000Z
DTEND:20201026T150000Z
UID:TALK151507@talks.cam.ac.uk
CONTACT:Cleo Loi
DESCRIPTION:Neutron stars (NSs) are seen as radio pulsars\, magnetars and 
 central compact objects. Magnetars and central compact objects are bright\
 , young NSs seen close to the centra of supernova remnants. Magnetars are 
 extremely magnetised neutron stars which shows a variety of observational 
 phenomena associated to their magnetic fields\, such as burst and giant fl
 ashes. Both magnetars and central compact objects are much hotter than it 
 is except even for very young neutron stars. We perform first three-dimens
 ional simulations of the magneto-thermal evolution using a spectral MHD co
 de. Our results show that presence of strong toroidal magnetic field in ma
 gnetars is necessary to explain their quiescent thermal emission\, in part
 icular a formation of a single hot spot. Using our thermal maps we are abl
 e to explain light curves of 10 out of 19 magnetars in quiescence. \nIn th
 e case of the central compact objects\, we test the configuration of magne
 tic field formed as a result of stochastic dynamo. Such a magnetic field c
 onsists of multiple randomly orientated loops of magnetic field. The globa
 l dipolar field slowly formed as a result of the Hall and Ohmic evolution.
  In our simulations we see 5-7% pulsed fraction\, formation of a few compa
 ct hot regions and difference of two times in temperature between hot and 
 cold regions typical for observations of the central compact objects.
LOCATION:Online
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