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SUMMARY:Protostars and discs: Low-mass star formation in a magnetised medi
 um - James Wurster (Exeter)
DTSTART:20181105T140000Z
DTEND:20181105T150000Z
UID:TALK110206@talks.cam.ac.uk
CONTACT:Dr William Béthune
DESCRIPTION:Stars play an important role in many astronomical phenomena on
  many difference scales..  Stars are born in and shape the evolution of gi
 ant molecular clouds\, which then may influence the evolution of the gas a
 nd dust in their host galaxy.  Discs form around young stars\, and it is i
 n these discs that planets form.  Stars emit the visible light that we see
  in galaxies\, thus understanding their numbers\, luminosities and ages is
  necessary to determine the properties about their host galaxy.\n\nUntil r
 ecently\, numerical simulations of low-mass star formation have been unabl
 e to produce large discs around a forming protostar.  This contradicts obs
 ervations.  With the inclusion of non-ideal magnetohydrodynamics (MHD)\, l
 arge discs are now being formed in numerical simulations\, indicating the 
 necessity of non-ideal MHD.  However\, the outcome is somewhat dependent o
 n initial conditions and free parameters\, indicating the necessity of car
 efully choosing realistic parameters.  Finally\, if the inclusion of non-i
 deal MHD can self-consistently re-introduce discs\, then what effect will 
 it have on the formation of the protostar itself?\n\nIn this talk\, I will
  first introduce the history of star formation\, and the three non-ideal M
 HD processes: Ohmic resistivity\, ambipolar diffusion\, and the Hall effec
 t.  I will then present the results from our numerical SPH simulations of 
 protostar formation\, focusing on the effect that non-ideal MHD has on the
  formation of discs\, outflows\, and on the evolution of the first and sec
 ond hydrostatic cores themselves.  This will be followed by a discussion o
 n disc fragmentation.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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