June 30 – July 11, 2008 – Institut Henri Poincaré, Paris
Asymmetric instabilities
in stellar core collapse
June 30 – July 11, 2008
Institut Henri Poincaré, Paris
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Organizing committee:
T. Foglizzo (CEA-Saclay, organizer)
H.Th. Janka (MPA Garching, co-organizer)
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Scientific overview:
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The physical mechanisms responsible for the explosion of massive stars are still not well understood. The discovery of new hydrodynamic instabilities, like the SASI and large amplitude neutron star g-modes in the context of stellar core collapse, has enabled a significant progress of our theoretical understanding of the processes that play a role in the cores of collapsing massive stars, and the conditions for the birth of neutron stars.
Over the past years, numerical simulations have revealed that these instabilities can be a key ingredient for successful supernova explosions: either in the classical scenario driven by neutrino energy deposition, or through a new acoustic mechanism involving the acoustic energy flux produced by g-mode oscillations of the nascent neutron star.
These asymmetrical instabilities are also capable of providing neutron star kicks, may influence their spin, and can lead to gravitational wave emission and special features of the neutrino emission.
While the complexity of the numerical models increases towards a 3D dynamical description of the rotating, magnetized collapsing core, the fundamental properties of these instabilities are still being debated and deserve clarification.
This workshop aims at discussing these recent advances by allowing productive interactions between experts using different numerical techniques and analytical methods.
In particular the following topics will be discussed during the meeting:
- Possible explosion mechanisms for supernovae
- Rotation of the progenitor and magnetic field: from classical SN to hypernovae and GRBs
- Signatures of the explosion mechanism in :
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the kick and spin of the pulsar | |
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nucleosynthesis | |
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neutrino emission | |
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gravitational waves |
- Underlying mechanism of SASI: acoustic or advective-acoustic ?
- Comparing SASI with other shock instabilities
- Towards a MHD version of SASI
- Spiral mode of SASI in 3D simulations
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List of invited participants
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| E. Audit (CEA Saclay) | B. Müller (MPA Garching) |
| C. Cardall (Oak Ridge Nat. Lab. & UT Knoxville) | H. Mikami (Chiba Univ.) |
| L. Dessart (Steward Obs. & Princeton Univ.) | J. Murphy (Univ. Washington, Seattle) |
| T. Foglizzo (CEA Saclay) | M. Obergaulinger (MPA Garching) |
| J. Guilet (CEA Saclay) | N. Ohnishi (Tohoku Univ.) |
| T. Hanawa (Chiba Univ.) | C. Ott (Univ. Arizona, Tucson) |
| W. Iwakami (Tohoku Univ.) | J. Sato (CEA Saclay) |
| H.Th. Janka (MPA Garching) | S. Scheidegger (Univ. Basel) |
| R. Käppeli (Univ. Basel) | Y. Suwa (Tokyo Univ.) |
| K. Kotake (NAOJ, Tokyo) | T. Takiwaki (Tokyo Univ.) |
| J.M. Laming (NRL, Washington) | J.C. Wheeler (Univ. Texas, Austin) |
| M. Liebendörfer (Univ. Basel) | S. Whitehouse (Univ. Basel) |
| E. Livne (Univ. Jerusalem) | S. Yamada (Waseda Univ.) |
| A. Marek (MPA Garching) | T. Yamasaki (CEA Saclay) |
| J. Margueron (IPN Orsay) |
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Programme, slides and video download
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The talks can be downloaded by clicking on the corresponding icons:
for pdf slides, and for mp4 videoMonday, June 30
| 9:30 | LOC | Welcome at IHP & Registration | ||||||
| 10:30 | coffee | |||||||
| 14:30 | J. Murphy | Criteria for core-collapse supernova explosions by the neutrino mechanism | ||||||
| 15:30 | tea |
Tuesday, July 1
| 9:30 | J.M. Laming | Analytic approach to the stability of standing accretion shocks | ||||||
| 10:30 | coffee | |||||||
| 11:00 | T. Foglizzo | Identifying the instability mechanism at work behind SASI | ||||||
| 13:30 | J. Sato | Numerical investigation of SASI through a toy model | ||||||
| 14:30 | E. Livne | Towards reliable simulations of core-collapse supernovae | ||||||
| 15:30 | tea | |||||||
| 16:00 | N. Ohnishi | Effects of neutrino heating and g-modes on SASI with steady-state initial conditions |
Wednesday, July 2
| 9:30 | S. Whitehouse | New results from 3-D supernova models with spectral neutrino diffusion | ||||||
| 10:30 | coffee | |||||||
| 11:00 | R. Käppeli | A Parallel 3D MHD code for core-collapse supernovae | ||||||
| 14:30 | W. Iwakami | Numerical analysis of SASI by 3-D simulations | ||||||
| 15:30 | tea | |||||||
| 16:00 | S. Yamada | SASI in black hole accretion |
Thursday, July 3
| 9:30 | J. Margueron | Nuclear liquid-gas phase transition and supernovae evolution | ||||||
| 10:30 | coffee | |||||||
| 11:00 | B. Müller | O-Ne-Mg supernovae explosion dynamics and nucleosynthesis conditions | ||||||
| 14:00 | C. Ott | 2D multi-angle multi-group radiation-hydrodynamics simulations of postbounce supernova cores | ||||||
| 14:40 | L. Dessart | Acoustic mechanism summary | ||||||
| 15:30 | tea |
Friday, July 4
| 9:30 | C. Cardall | Magnetic field amplification by the stationary accretion shock instability | ||||||
| 10:30 | coffee | |||||||
| 11:00 | J. Guilet | Towards a MHD version of SASI | ||||||
| 13:30 | M. Obergaulinger | Local simulations of the magneto-rotational instability | ||||||
| 14:30 | T. Yamasaki | Effects of rotation on SASI & MRI during core collapse | ||||||
| 15:30 | tea |
Monday, July 7
| 10:30 | coffee | |||||||
| 14:30 | M. Liebendörfer | Investigating supernova dynamics and magnetic fields in 3D | ||||||
| 15:30 | tea | |||||||
| 16:00 | H. Mikami | The 3D MHD effects for a core collapse supernova explosion |
Tuesday, July 8
| 9:30 | Y. Suwa | Gravitational collapse of very massive stars | ||||||
| 10:30 | coffee | |||||||
| 11:00 | T. Takiwaki | Magnetorotational collapse and jet formation | ||||||
| 15:30 | tea |
Wednesday, July 9
| 9:30 | L. Dessart | Core-collapse supernovae explosions. Magneto-rotational mechanism | ||||||
| 10:30 | coffee | |||||||
| 11:00 | E. Audit | Radiation hydrodynamics using moment method | ||||||
| 15:30 | tea |
Thursday, July 10
| 9:30 | S. Scheidegger | The gravitational wave signature of ‘realistic’ 3D core collapse simulations | ||||||
| 10:30 | coffee | |||||||
| 11:00 | C. Ott | The gravitational wave signature of core-collapse supernovae | ||||||
| 14:30 | K. Kotake | Stochastic features of gravitational-wave signals in 3D supernova explosions with SASI and GWs from MHD explosions | ||||||
| 15:30 | tea |
Friday, July 11
| 10:30 | coffee | |||||||
| 11:00 | T. Foglizzo | Concluding discussion | ||||||
| 15:30 | tea |
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Venue of the meeting
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The address of IHP is 11, rue Pierre et Marie Curie, Paris 75005 (map of the area). More information about IHP can be found in English on their web page.
Desks and office space will be available at IHP for the invited participants, including iMac computers, printers, wireless and ethernet connection to the internet for personal laptops.
The first week (June 30 – July 4) will be organized with 4-6 talks per day, coffee breaks and time for discussions.
The second week (July 7-11) will offer more time for scientific interactions, with only 2 talks per day.
There will be no publication of conference proceedings, but the talks will be recorded and posted on the web server of CEA, together with their slides. This web page has been built with the kind help of C. Gouiffes.
Local Organizing Committee: T. Foglizzo, J. Guilet, J. Sato, T. Yamasaki.
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Accommodation issues and financial support
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Financial support will be granted to the invited participants who plan to also stay for the second week of the workshop. This support aims at covering the full cost of accommodation, either in apartments associated to IHP or in nearby hotels.
Partial support for the first week will also be available upon application.
Student housing will also be available upon request, at the University Campus of the “Cité Internationale”.
A list of nearby hotels recommended by IHP is available here for those who can only stay for the first week. Early reservation is recommended, preferably before April 15.
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Registration procedure for other participants
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Researchers and students interested in attending this workshop are welcome.
Due to space limitations, registration by email is recommended.
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Sponsors
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CEA/IRFU/SAp, UMR AIM, IHP, CNRS (GdR PCHE), INSU, CNES