3d long-time core-collapse supernova simulations · 2016. 3. 23. · core-collapse and bounce...
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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
Introduction
Figure from Janka et al. (2012)
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
Explore 4 progenitors, varying explosion energies
shock propagates according to blast wave solution (Sedov, 1959)
accelerates when ρr3 decreases, and vice versa
Shock dynamics
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
RSG model
Shock strongly accelerates --> RTI fingers stretch --> Reverse shock forms --> RTI fingers collide with
Reverse shock
at He/H interface
meet reverse shock
N20 model
Shock accelerates briefly --> Reverse shock forms --> Slow nickel bubbles collide with reverse shock and
flattened
at He/H interface
meet reverse shock
B15 model
at C+O/He interface
at He/H interface
Significant growth of RTIs --> fragmentation of nickel bubbles
B15 model
Shock accelerates briefly --> Reverse shock forms --> Fast nickel fingers ahead of reverse shock !!!
at He/H interface
meet reverse shock
B15 model
Fast nickel fingers stretch --> inner part of ejecta trapped by reverse shock
meet reverse shock
shock breakout
N20 BSG modelNickel too slow
at He/H interface
meet reverse shockShock too fast
RSG model
Explosion vs. late-time asymmetries
clear correlation
not so clear??
Early vs. late morphology
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
SN1987A
Woosley et al. (1988)
Shigeyama & Nomoto (1990)
Woosley (2007)
Woosley et al. (1997)
~ 3700 km/s < 2000 km/s
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
Conclusion II
- performing 3D long-time CCSNe simulations
- extending simulations to later phases, connecting SN ---> SNR
- working towards comparison with observations
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
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
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)
Suvarnabhumi international airport, Bangkok
Vasuki (king of serpent)
How apsaras were born ??
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)
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
Mapped grid technique
Define one-to-one mapping function
Three main references
MPI+OpenMP parallelized
Testing the code
Linear acoustic wave
Non-linear terms intervene
Testing the code
Linear acoustic wave
Self convergence
Failure of Roe type flux
APSARA can capture low-mach number flows better
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
Future development
Single block circular domain
Low quality grid cells along diagonals
Mapped multi-block grid