modeling sub-chandrasekhar mass white dwarf explosions …
TRANSCRIPT
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Abigail Polin NSF Fellow, UC Berkeley
12 March 2019
Cooks Branch Workshop 12 March [email protected]
Modeling Sub-Chandrasekhar Mass White Dwarf Explosionsas Type Ia Supernovae
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The Sub-Chandrasekhar Model
C/O WD
M < 1.4 M⦿ surface Helium shell
Double Detonation Scenario: detonation of the surface helium leads to a detonation of the carbon-oxygen core
accreted from
from a collision with
non-degenerate
degenerate
He WD
(Thick Helium Shells)
(Thin Helium Shells)
Primary Progenitor
Possible Companion
Cooks Branch Workshop 12 March 2019
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Numerical Methods — CastroCastro: an adaptive mesh, astrophysical radiation hydrodynamics code
example adaptive grid designed to tag areas of nuclear burning for refinement
Radius (km)
Tem
pera
ture
(K)
Den
sity
(g/c
m3 )
Cooks Branch Workshop 12 March 2019
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Double Detonation - 0.76 M⦿ WD w/ 0.15 M⦿ HeDensityTemperature
Cooks Branch Workshop 12 March 2019
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Potential for heavy elenents in the outer ejecta
Density radioactive elements IMEs (10<Z<40)
Cooks Branch Workshop 12 March 2019
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Example Ejecta Composition
0.01
0.1
1
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
5 x 103 km/s 10 15 2025M
ass
Frac
tion
Interior Mass [MO• ]
4He16O10 < Z ≤ 2044Ti+48Cr+52Fe56Ni
1.0 M⦿ WD w/ 0.08 M⦿ He
Cooks Branch Workshop 12 March 2019
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Light Curves - (g-band)
0 5 10 15 20 25 30 35 40 45
0.08 MO• He Shells
Days Since Explosion
1.1 MO• WD1.0 MO• WD0.9 MO• WD0.8 MO• WD
-20
-19
-18
-17
-16
-15
-14
-13
-12 0 5 10 15 20 25 30 35 40 45
0.01 MO• He Shells
Abso
lute
Mag
nitu
de
Days Since Explosion
1.1 MO• WD1.0 MO• WD0.9 MO• WD0.8 MO• WD
Thin Helium Shells Thick Helium Shells
Cooks Branch Workshop 12 March 2019
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Spectra - (at peak g-band)Thin Helium Shells Thick Helium Shells
3000 4000 5000 6000 7000 8000 9000 10000
1.1
1.0
0.9
0.8
0.85
0.7
CaII
SiII CaII
TiII
1.2
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
1.1 MO•
1.0 MO•
0.9 MO•0.8 MO•0.7 MO•
CaII SiII CaIITiII
Spectra at Peak
F λ in
arb
itrar
y un
its3000 4000 5000 6000 7000 8000 9000
0.8 MO• WD2.6 days after explosion
Spectra at Early Excess
Wavelength (Angstroms)
Cooks Branch Workshop 12 March 2019
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Thin Helium Shells Thick Helium Shells
3000 4000 5000 6000 7000 8000 9000 10000
1.1
1.0
0.9
0.8
0.85
0.7
CaII
SiII CaII
TiII
1.2
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
1.1 MO•
1.0 MO•
0.9 MO•0.8 MO•0.7 MO•
CaII SiII CaIITiII
Spectra at Peak
F λ in
arb
itrar
y un
its3000 4000 5000 6000 7000 8000 9000
0.8 MO• WD2.6 days after explosion
Spectra at Early Excess
Wavelength (Angstroms)
Spectra - (at peak g-band)
Cooks Branch Workshop 12 March 2019
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Thin Shells - Peak Spectra - 0.01 M⦿ He
3000 4000 5000 6000 7000 8000 9000 10000
1.1
1.0
0.9
0.8
0.85
0.7
CaII
SiII CaII
TiII
1.2
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
Cooks Branch Workshop 12 March 2019
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Thin Shells — 0.01 M⦿ He
3000 4000 5000 6000 7000 8000 9000 10000
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
0.8 MO• WD0.85 MO• WD
0.9 MO• WD1991bg
Cooks Branch Workshop 12 March 2019
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Thin Shells — 0.01 M⦿ He
3000 4000 5000 6000 7000 8000 9000 10000
1.1
1.0
0.9
0.8
0.85
0.7
CaII
SiII CaII
TiII
1.2
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
Cooks Branch Workshop 12 March 2019
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Thin Shells — 0.01 M⦿ HeLu
min
osity
(WD
Mas
s)
3000 4000 5000 6000 7000 8000 9000 10000
1.1
1.0
0.9
0.8
0.85
0.7
CaII
SiII CaII
TiII
1.2
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
Cooks Branch Workshop 12 March 2019
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Thin Shells — 0.01 M⦿ HeLu
min
osity
(WD
Mas
s)
3000 4000 5000 6000 7000 8000 9000 10000
1.1
1.0
0.9
0.8
0.85
0.7
CaII
SiII CaII
TiII
1.2
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
Si II Velocity
Cooks Branch Workshop 12 March 2019
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Thin Shells — 0.01 M⦿ He
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
MB
SiII Velocity [1000 km/s]
Zheng et al. 2018
Polin et al. 2018
Cooks Branch Workshop 12 March 2019
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Thin Shells — 0.01 M⦿ He
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
MB
SiII Velocity [1000 km/s]
Zheng et al. 2018
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
1.10 MO• WD1.00 MO• WD0.90 MO• WD
1.20 MO• WD
MB
SiII Velocity [1000 km/s]
0.01 MO• He ShellsZheng et al. 2018
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
1.10 MO• WD1.00 MO• WD0.90 MO• WD
1.20 MO• WD
MB
SiII Velocity [1000 km/s]
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
1.10 MO• WD1.00 MO• WD0.90 MO• WD
1.20 MO• WD
MB
SiII Velocity [1000 km/s]
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
1.10 MO• WD1.00 MO• WD0.90 MO• WD
1.20 MO• WD
MB
SiII Velocity [1000 km/s]
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
1.10 MO• WD1.00 MO• WD0.90 MO• WD
1.20 MO• WD
MB
SiII Velocity [1000 km/s]
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
1.10 MO• WD1.00 MO• WD0.90 MO• WD
1.20 MO• WD
MB
SiII Velocity [1000 km/s]Polin et al. 2018
Cooks Branch Workshop 12 March 2019
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Thin Shells — 0.01 M⦿ He
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
MB
SiII Velocity [1000 km/s]
Zheng et al. 2018
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
MB
SiII Velocity [1000 km/s]
0.01 MO• He ShellsZheng et al. 2018
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
MB
SiII Velocity [1000 km/s]
-21.0
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
MB
SiII Velocity [1000 km/s]
0.01 MO• He ShellsZheng et al. 2018
-0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4B-V
-21.0
-20.5
-20.0
-19.5
-19.0
-18.5
-18.0
-17.5
-17.09.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
MB
SiII Velocity [1000 km/s]
-0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4B-V
Polin et al. 2018
Cooks Branch Workshop 12 March 2019
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Thin Helium Shells Thick Helium Shells
3000 4000 5000 6000 7000 8000 9000 10000
1.1
1.0
0.9
0.8
0.85
0.7
CaII
SiII CaII
TiII
1.2
log
F ν in
arb
itrar
y un
its
Wavelength (Angstroms)
1.1 MO•
1.0 MO•
0.9 MO•0.8 MO•0.7 MO•
CaII SiII CaIITiII
Spectra at Peak
F λ in
arb
itrar
y un
its3000 4000 5000 6000 7000 8000 9000
0.8 MO• WD2.6 days after explosion
Spectra at Early Excess
Wavelength (Angstroms)
Spectra - (at peak g-band)
Cooks Branch Workshop 12 March 2019
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Thick Shells — 0.08 M⦿ He
1.1 MO•
1.0 MO•
0.9 MO•0.8 MO•0.7 MO•
CaII SiII CaIITiII
Spectra at PeakF λ
in a
rbitr
ary
units
3000 4000 5000 6000 7000 8000 9000
0.8 MO• WD2.6 days after explosion
Spectra at Early Excess
Wavelength (Angstroms)
Cooks Branch Workshop 12 March 2019
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SN2018byg (ZTF18aaqeasu)A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar Mass White Dwarf De et al. 2019
�20 �10 0 10 20 30 40Rest frame phase from r band peak (days)
18
19
20
21
22
App
aren
tm
agni
tude
�19
�18
�17
�16
�15
Abs
olut
em
agni
tude
S S S S S S S S
P48 r
P60 r
P60 g � 3
P200 g � 3
P60 i + 1.5
Cooks Branch Workshop 12 March 2019
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SN2018byg (ZTF18aaqeasu)
De et al. 2019
0 10 20 30 40Rest frame time from explosion (days)
�19.5
�19.0
�18.5
�18.0
�17.5
�17.0
�16.5
Abs
olut
em
agni
tude
K10 0.81 M�, 0.13 M�
K10 0.92 M�, 0.08 M�
P18 0.80 M�, 0.15 M� NM
P18 0.76 M�, 0.15 M� NM
P18 0.76 M�, 0.15 M�, 0.2 M�
P18 0.7 M�, 0.15 M�, NM
P18 0.8 M�, 0.08 M�, NM
ZTF 18aaqeasu
Cooks Branch Workshop 12 March 2019
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SN2018byg (ZTF18aaqeasu)0.76 M⦿ WD w/ 0.15 M⦿ Shell
De et al. 2019
no mixing0.18 M⦿ mixing
Cooks Branch Workshop 12 March 2019
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SN2018byg (ZTF18aaqeasu)0.76 M⦿ WD w/ 0.15 M⦿ Shell
De et al. 2019
no mixing0.18 M⦿ mixing
Σ (Xradioactive)
Cooks Branch Workshop 12 March 2019
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Future/Preliminary WorkNebular Modeling
2000 4000 6000 8000 10000 12000
Day 150
1.2 MO• WD 1.1 MO• WD1.0 MO• WD 0.9 MO• WD
0.85 MO• WD 0.8 MO• WD
F λ in
arb
itrar
y un
its
Wavelength [°A]
0.01 M⦿ He Shells
Cooks Branch Workshop 12 March 2019