Almog Yalinewich
20.11.19
Arcavi et al. 2017
What happened in 1954?
NS/BH transition
More massive star -> shorter life
How could a neutron star have formed in the primary's lifetime?
Relic mass
Belczynski et al 2010
Less massive but more evolved
Mass transfer
Zoom in
accretion
feedback
Bachetti et al 2014
SAX J1808.4-3658
spontaneous
Pressure build up
energy determined by binding energy
Sanna et al 2017
Mini EMP from SGR 1806-20
on 21:30:26.5 UT, Dec 27, 2004
10% of the magnetic energy
Inan et al 2007
https://github.com/bolverk/huji-rich
Energy
adiabatic losses
Temperature
photon production
Hydrodynamic evolution
Energy Deposition
Ejecta distribution
Radiative transfer
adiabatic atmosphere
adiabatic index
momentum
conservation
energy
conservation
Fractal dimension of the Sierpinski triangle
radiative
adiabatic
Yalinewich & Matzner 2019
radiative
adiabatic
Yalinewich & Matzner 2019
opacity
cross section
Photon production
Thermal Bremsstrahlung
In blackbody equilibrium
Colour shell
energy deposited
adiabatic loss
luminosity shell
colour shell
photosphere
Bondi energy
1954 event
1954 event
1954 event
1954 event
Distance from edge
Density
Velocity
Stellar surface
t
x
Same shell
Watching the same shell cool
Deeper shells are exposed
Material from depth l is expelled from the crater
Photons diffuse from that shell
end of spherical phase and beginning of crater phase
Eventually, the crater radius exceeds the luminosity radius
After that, photons immediately escape from the shock
Snowplough phase
Transition time is extremely long
Yalinewich et al 2018
Woosley 2018
Moriya et al 2018
More events with LSST?
Rare event (1/century)
Polarisation from Supernova
G315.78−0.23 a.k.a Frying pan nebula, from Schnitzel et al 2019
Rapidly spinning Be stars
Days since explosion
0
30
Apparent magnitude
10
20
Perley et al 2018
Developed theoretical model for an explosion near stellar surface
Possible explanation for the 1954 Event
Might also explain FBOTs and weird LSST detections