3d long-time core-collapse supernova simulations · 2016. 3. 23. · core-collapse and bounce...
TRANSCRIPT
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3D Long-time Core-Collapse Supernova Simulations
Annop Wongwathanarat
Ewald Müller
Hans-Thomas Janka
Max-Planck-Institutfür Astrophysik
Astrophysical Big Bang Laboratory
18th Workshop on Nuclear Astrophysics
Victor Utrobin
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Introduction
Figure from Janka et al. (2012)
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core-collapse and bounce
Explosion >>> 1.3 s post bounce
Stellar evolution model
1D
3D
1.25 day after explosions
Light curves calculations
1D
State-of-the-art long-time simulations
PROMETHEUS-HOTB
PROMETHEUS-HOTB + Yin-Yang grid
CRAB Lagrangian radiation hydrodynamics
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Explore 4 progenitors, varying explosion energies
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shock propagates according to blast wave solution (Sedov, 1959)
accelerates when ρr3 decreases, and vice versa
Shock dynamics
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Woosley&Weaver(1995) RSG, W15
Limongi+ (2000)RSG, L15
Shigeyama&Nomoto (1990) BSG, N20
Woosley+ (1988) BSG, B15
Nickel-rich ejecta at shock breakout
Results
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RSG model
Shock strongly accelerates --> RTI fingers stretch --> Reverse shock forms --> RTI fingers collide with
Reverse shock
at He/H interface
meet reverse shock
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N20 model
Shock accelerates briefly --> Reverse shock forms --> Slow nickel bubbles collide with reverse shock and
flattened
at He/H interface
meet reverse shock
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B15 model
at C+O/He interface
at He/H interface
Significant growth of RTIs --> fragmentation of nickel bubbles
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B15 model
Shock accelerates briefly --> Reverse shock forms --> Fast nickel fingers ahead of reverse shock !!!
at He/H interface
meet reverse shock
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B15 model
Fast nickel fingers stretch --> inner part of ejecta trapped by reverse shock
meet reverse shock
shock breakout
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N20 BSG modelNickel too slow
at He/H interface
meet reverse shockShock too fast
RSG model
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Explosion vs. late-time asymmetries
clear correlation
not so clear??
Early vs. late morphology
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Conclusion I
- evolution of early-time asymmetries associated with explosion mechanism depends on complex interplays between the asymmetries and the SN shock
- SN shock dynamics connects to the density structure of the progenitor star
- Density structure of He shell and He/H interface are very important in determining the fate of heavy clumps
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SN1987A
Woosley et al. (1988)
Shigeyama & Nomoto (1990)
Woosley (2007)
Woosley et al. (1997)
~ 3700 km/s < 2000 km/s
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Light Curves of SN1987A
B15, N20, W20, W18
B15 model reproduce the dome of light curve
Utrobin et al. (2015)
and normal IIP
See Victor’s talk on Friday
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Conclusion II
- performing 3D long-time CCSNe simulations
- extending simulations to later phases, connecting SN ---> SNR
- working towards comparison with observations
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Development of a new high-order finite-volume hydrodynamic code for
astrophysical applications
Annop Wongwathanarat
Hannes Grimm-Strele
Ewald Müller
Max-Planck-Institutfür Astrophysik
Astrophysical Big Bang Laboratory
18th Workshop on Nuclear Astrophysics
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An Apsara is a female spirit of the clouds and water in Hindu mythology.Apsaras are said to be able to change their shape at will.
(figure from wikipedia)
Submitted to A&A
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How apsaras were born ??
Vishnu
Asuras
Devas
Suvarnabhumi international airport, Bangkok
Ocean of milk
Mount Mandara
Ceremony to obtain the nectar of immortality
Kurma (Vishnu’s avartar)
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Suvarnabhumi international airport, Bangkok
Vasuki (king of serpent)
How apsaras were born ??
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An Apsara is a female spirit of the clouds and water in Hindu mythology.Apsaras are said to be able to change their shape at will.
(figure from wikipedia)
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Mapped grid technique
Credit: http://www.innovative-cfd.com/cfd-grid.html
Non-uniform grid in physical space is mapped to equidistant Cartesian grid in computational space
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Mapped grid technique
Define one-to-one mapping function
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Three main references
MPI+OpenMP parallelized
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Testing the code
Linear acoustic wave
Non-linear terms intervene
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Testing the code
Linear acoustic wave
Self convergence
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Failure of Roe type flux
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APSARA can capture low-mach number flows better
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Conclusion III
- Developing high-order hydro code named APSARA
- Will be able to work on a singularity-free mesh in spherical geometry
- Will capture low-mach number flows more accurately
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Future development
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Single block circular domain
Low quality grid cells along diagonals
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Mapped multi-block grid