CoreCollapse and NS/BH Formation Chris Fryer Vicky Kalogera Alex - - PDF document

Chris Fryer Vicky Kalogera Alex Heger

Core−Collapse and NS/BH Formation

...

τν=1

vff

2

P

shock = 1 2 ρ s

~50km ~100−300km Entropy Driven Convection

Infalling Material Accretion Shock Produces Proto NS

Convection Enhanced Supernovae

Adiabatically Before Losing Its Energy Neutrino Heated Material Rises, Cooling Via Neutrino Emission Infalling Material Convects Down to the Proto−Neutron Star. It Does NOT Pile Up at the Accretion Shock. The Convective Region Must Overcome this Pressure to Launch an Explosion

15 Solar Mass Progenitor 25 Solar Mass Progenitor

Z=0

final mass (solar masses) 1 3 10 30 100 300 1000 1 3 10 30 100 300 1000 initial mass (solar masses, logarithmic) CO AGB mass loss black hole supermassive stars low mass stars very massive stars n

• m

a s s l

• s

s RSG m a s s a f t e r c

• r

e h e l i u m b u r n i n g m a s s a t c

• r

e c

• l

l a p s e pulsational pair instability pair instability h e l i u m c

• r

e neutron star massive stars NeO direct black hole formation white dwarf s u p e r n

• v

a e x p l

• s

i

• n

(logarithmic) (baryonic) fallback black hole direct black hole formation nickel photodisintegration helium photodisintegration no remnant - complete disruption (C) Alexander Heger, 2001

SN Ib/c

weak SN Ib/c

no BH pair SN

• puls. pair (BH)

S N I I L / b

SN IIP

weak SN IIP

B H b y f a l l b a c k ( w e a k S N ) BH by fallback (weak SN) iron core collapse O/Ne/Mg core collapse low mass stars −− white dwarfs direct black hole direct black hole direct black hole no H envelope 60 100 140 40 initial mass (solar masses) 9 10 about solar metal−free 34 260 metallicity (roughly logarithmic scale) 20

direct black hole

BH by fallback BH by fallback

neutron star neutron star

B H b y f a l l b a c k ( w e a k S N ) BH by fallback (weak SN) iron core collapse O/Ne/Mg core collapse low mass stars −− white dwarfs direct black hole direct black hole direct black hole no H envelope 60 100 140 40 initial mass (solar masses) 9 10 about solar metal−free 34 260 metallicity (roughly logarithmic scale) 20

direct black hole

BH by fallback BH by fallback

neutron star neutron star

B H b y f a l l b a c k ( w e a k S N ) BH by fallback (weak SN) iron core collapse O/Ne/Mg core collapse low mass stars −− white dwarfs direct black hole direct black hole direct black hole no H envelope 25 60 100 140 40 initial mass (solar masses) 9 10 about solar metal−free 34 260 metallicity (roughly logarithmic scale)