| supernova
type |
Ia |
Ic |
Ib |
IIb |
IIL |
IIP |
IIn |
| observations |
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| early spectra | |||||||
H |
no hydrogen present |
hydrogen present |
absent/weak
in absorption, but narrow emission lines present |
||||
| Si |
silicon
present |
no/little
silicon present |
present |
||||
He |
helium
poor |
helium
rich |
helium
dominant over hydrogen |
helium present but hydrogen dominant |
|||
| O |
yes |
||||||
| Mg,
Si, S |
yes,
near max light |
similar
to II |
strong |
||||
| Fe-group
|
only
at later times |
both
early and late times |
both
early and late times |
||||
light curve rise |
2 weeks |
1
- 2 weeks, followed by 1 - 2 months at constant luminosity |
|||||
| light
curve decay after maximum |
long,
slow, gradual decline |
similar to Ia |
linear decline |
plateau then decline |
long
slow decline |
||
| radio
emission |
none |
often (indicative of presence of circumstellar matter, due to location in/near galactic plane) |
|||||
| x-ray
emission |
none? |
some (indicative of presence of circumstellar matter, due to location in/near galactic plane) |
|||||
| host
galaxies |
all (ellipitcals, spirals, & irregulars) |
spirals,
barred spirals, occasionally irregulars, in spiral arms (rarely in S/E0 ??) |
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| theory |
|||||||
| Ia |
Ic |
Ib |
IIb |
IIP |
IIL |
II
n |
|
explosion mechanism |
detonation
(supersonic front) or deflagration (subsonic front) of carbon core of a white dwarf |
core collapse of a massive (greater than 8 solar masses) supergiant star (initial mass: 10 - 50? solar masses) |
|||||
presence or absence of H/He |
no H/He remaining in progenitor |
hydrogen
depleted by: |
hydrogen
rich |
hydrogen depleted by tidal stripping? |
|||
| winds
(Wolf-Rayet progenitors) or binary interactions |
tidal
stripping |
||||||
| He
mantle also removed |
He mantle not removed | ||||||
| post-SN
luminosity powered by |
entirely
by radioactive decay |
entirely
by radioactive decay |
entirely
by radioactive decay |
shock
energy + radioactive decay? |
interaction
with circumstellar matter |
||
| post-SN
remnant |
none |
neutron star (or non-prompt black hole) |
|||||
| examples |
SN1006 Tycho? Kepler |
1987A Cas A? |
Crab? |
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