J/A+A/656/A61 SN Ib nebular phase properties (Dessart+, 2021)
Nebular phase properties of supernova Ibc from He-star explosions.
Dessart L., Hillier D.J., Sukhbold T., Woosley S.E., Janka H.-T.
<Astron. Astrophys. 656, A61 (2021)>
=2021A&A...656A..61D 2021A&A...656A..61D (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Supernovae
Keywords: radiative transfer - stars: evolution - supernovae: general -
binaries: general
Abstract:
Following our recent work on Type II supernovae (SNe), we present a
set of 1D nonlocal thermodynamic equilibrium radiative transfer
calculations for nebular-phase Type Ibc SNe starting from
state-of-the-art explosion models with detailed nucleosynthesis. Our
grid of progenitor models is derived from He stars that were
subsequently evolved under the influence of wind mass loss. These He
stars, which most likely form through binary mass exchange, synthesize
less oxygen than their single-star counterparts with the same zero-age
main sequence (ZAMS) mass. This reduction is greater in He-star models
evolved with an enhanced mass loss rate. We obtain a wide range of
spectral properties at 200 d. In models from He stars with an initial
mass >6M☉ the [OI] λλ6300, 6364 is of comparable
or greater strength than [CaII] λλ7291, 7323 - the
strength of [OI] λλ6300, 6364 increases with He-star
initial mass. In contrast, models from lower mass He stars exhibit a
weak [OI] λλ6300, 6364, strong [CaII]
λλ7291, 7323, but also strong NII lines and FeII
emission below 5500Å. The ejecta density, modulated by the ejecta
mass, the explosion energy, and clumping, has a critical impact on the
gas ionization, line cooling, and the spectral properties. FeII
dominates the emission below 5500Å and is stronger at earlier
nebular epochs. It ebbs as the SN ages, while the fractional flux in
[OI] λλ6300, 6364 and [CaII] λλ7291, 7323
increases, with a similar rate, as the ejecta recombine. Although the
results depend on the adopted wind mass loss rate and pre-SN mass, we
find that He-stars of 6-8M☉ initially (ZAMS mass of
23-28M☉) match adequately the properties of standard SNe Ibc.
This finding agrees with the oset in progenitor masses inferred from
the environments of SNe Ibc relative to SNe II. Our results for less
massive He stars are more perplexing, since the predicted spectra are
not seen in nature. They may be missed by current surveys or
associated with Type Ibn SNe in which interaction dominates over decay
power.
Description:
Properties of the main-subshells of models as selected from the Ertl
et al. (2020ApJ...890...51E 2020ApJ...890...51E) unmixed ejecta.
Each of these sub-shells is split in three equal mass parts and
shuffled in mass space with the Lagrangian mass Msh, which is chosen
to be at the interface between the He/C and the He/N shells, or
between the O/C and He/C shells when the He/N shell is absent (as in
the most massive progenitors), in tablea.dat.
The tables (tablea3.dat-tablea23.dat) indicate the average mass
fraction of each species within each of these sub-shells. With the
exception of 56Ni and 56Co, all isotopes in the nuclear network
are considered stable and included in the total mass fraction of the
corresponding element. So, 59Co (58Ni) include all Co (Ni)
isotopes except 56Co (56Ni).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea.dat 101 21 Individual masses by elements for each models
tablea3.dat 80 20 *Properties of the main-subshells of model he2p6
tablea4.dat 80 20 *Properties of the main-subshells of model he2p9
tablea5.dat 80 20 *Properties of the main-subshells of model he3p3
tablea6.dat 80 20 *Properties of the main-subshells of model he3p5
tablea7.dat 80 20 *Properties of the main-subshells of model he4p0
tablea8.dat 80 20 *Properties of the main-subshells of model he4p5
tablea9.dat 80 20 *Properties of the main-subshells of model he5p0
tablea10.dat 80 20 *Properties of the main-subshells of model he6p0
tablea11.dat 80 20 *Properties of the main-subshells of model he7p0
tablea12.dat 80 20 *Properties of the main-subshells of model he8p0
tablea13.dat 80 20 *Properties of the main-subshells of model he12p0
tablea14.dat 80 20 *Properties of the main-subshells of model he5p0x1p5
tablea15.dat 80 20 *Properties of the main-subshells of model he6p0x1p5
tablea16.dat 89 20 *Properties of the main-subshells of model he7p0x1p5
tablea17.dat 89 20 *Properties of the main-subshells of model he8p0x1p5
tablea18.dat 80 20 *Properties of the main-subshells of model he9p0x1p5
tablea19.dat 80 20 *Properties of the main-subshells of model he10p0x1p5
tablea20.dat 80 20 *Properties of the main-subshells of model he11p0x1p5
tablea21.dat 80 20 *Properties of the main-subshells of model he12p0x1p5
tablea22.dat 80 20 *Properties of the main-subshells of model he13p0x1p5
tablea23.dat 80 20 *Properties of the main-subshells of model he10p0x2p0
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Note on tablea?*.dat: as selected from the Ertl et al. (2020ApJ...890...51E 2020ApJ...890...51E)
unmixed ejecta.
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Byte-by-byte Description of file: tablea.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Table Table name
14- 23 A10 --- Model Model
25- 29 F5.3 Msun Fe/He Fe/He shell mass
31- 35 F5.3 Msun Si/S Si/S shell mass
37- 41 F5.3 Msun O/Si O/Si shell mass
43- 47 F5.3 Msun O/Ne/Mg O/Ne/Mg shell mass
49- 53 F5.3 Msun O/C O/C shell mass
55- 59 F5.3 Msun He/C ? He/C shell mass
61- 65 F5.3 Msun He/N ? He/N shell mass
67- 71 F5.3 Msun He/C/O ? He/C/O shell mass
73- 77 F5.3 Msun C/He/O ? C/He/O shell mass
79- 83 F5.3 Msun He/C/N ? He/C/N shell mass
85- 89 F5.3 Msun O/C/He ? O/C/He shell mass
91- 95 F5.3 Msun C/O/He1 ? C/O/He shell mass
97-101 F5.3 Msun C/O/He2 ? C/O/He (with more He than in C/O/He1)
shell mass
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Byte-by-byte Description of file: tablea?.dat tablea1[45].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- He/C Average He/C mass fraction in the shell
73- 80 E8.3 --- He/N Average He/N mass fraction in the shell
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Byte-by-byte Description of file: tablea10.dat tablea11.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- He/C/O Average He/C/O mass fraction in the shell
73- 80 E8.3 --- He/N Average He/N mass fraction in the shell
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Byte-by-byte Description of file: tablea12.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- C/He/O Average C/He/O mass fraction in the shell
73- 80 E8.3 --- He/C/N Average He/C/N mass fraction in the shell
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Byte-by-byte Description of file: tablea13.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- O/C/He Average O/C/He mass fraction in the shell
73- 80 E8.3 --- C/He/O Average C/He/O mass fraction in the shell
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Byte-by-byte Description of file: tablea16.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- C/He/O Average C/He/O mass fraction in the shell
73- 80 E8.3 --- He/C Average He/C mass fraction in the shell
82- 89 E8.3 --- He/N Average He/N mass fraction in the shell
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Byte-by-byte Description of file: tablea17.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- C/He/O Average C/He/O mass fraction in the shell
73- 80 E8.3 --- He/C Average He/C mass fraction in the shell
82- 89 E8.3 --- He/C/N Average He/C/N mass fraction in the shell
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Byte-by-byte Description of file: tablea18.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- C/O/He Average C/O/He mass fraction in the shell
73- 80 E8.3 --- C/He/O Average C/He/O mass fraction in the shell
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Byte-by-byte Description of file: tablea19.dat tablea2?.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Model Model
12- 17 A6 --- El Element
19- 26 E8.3 --- Fe/He Average Fe/He mass fraction in the shell
28- 35 E8.3 --- Si/S Average Si/S mass fraction in the shell
37- 44 E8.3 --- O/Si Average O/Si mass fraction in the shell
46- 53 E8.3 --- O/Ne/Mg Average O/Ne/Mg mass fraction in the shell
55- 62 E8.3 --- O/C Average O/C mass fraction in the shell
64- 71 E8.3 --- C/O/He1 Average C/O/He mass fraction in the shell
73- 80 E8.3 --- C/O/He2 Average C/O/He (with more He than in C/O/He1)
mass fraction in the shell
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Acknowledgements:
Luc Dessart, dessart(at)iap.fr
(End) Patricia Vannier [CDS] 28-Sep-2021