LVCSupernovaWorkshopSearchesPanel Mezzacappa V2 · 00.2 0.40.6 0.8 1 1.2 Time from bounce [s] 0 0.2...

Stellar Core Bounce Proto‐Neutron Star(PNS) Instabilities

Post‐ShockRegion

Neutrino‐DrivenConvection Induced

Standing AccretionShock Instability (SASI)

Induced

0 0.2 0.4 0.6 0.8 1 1.2Time from bounce [s]

0

0.2

0.4

0.6

0.8

Expl

osio

n En

ergy

[B]

W-H 12 solar mass progenitorW-H 15 solar mass progenitorW-H 20 solar mass progenitorW-H 25 solar mass progenitor

Explosion Energy versus Progenitor MassWossley-Heger 12, 15, 20, 25 Solar Mass Nonrotating Progenitors; 256 x 256 Spatial Resolution

Explosion

3/29/2017 1Kei Kotake will give an extensive overview as part of the 

Status of Core Collapse Supernova Modeling Panel.

3/29/2017 2

r = 10 km

f m = 0.1f maxm

f m = 0

�= 1010 g/ cm3

Standing accret ion shock

A A1

A2B

C

PNS

Sources of Gravitational Radiation

(1) PNS convection in region A.

(2) Acoustic waves in the PNS initiated by PNS convection.

(3) Deceleration of infalling convective plumes.

(4) Excitation of PNS g‐modes by these down flows (2D) or by PNS convection (3D).

• Andresen et al. 2017 arXiv:1607.05199

• Marek, Janka, and Mueller, A&A 496, 475 (2009)• Murphy, Ott, and Burrows Ap.J. 707 1173 (2009)• Mueller, Janka, and Marek Ap.J. 766, 43 (2013)

The late‐time, high‐frequency GW is given by the g‐modefrequency in B (A2) for the 2D (3D) case.

g‐Mode Frequency (Brunt‐Vaisala Frequency)

(5) SASI‐Induced Modulation (Low Frequency)

3/29/2017 3Yakunin et al. 2015 PRD 92 084040 

Quasi‐Spherical Collapse=> Bounce Signal Absent

Prompt ConvectionAcoustic Waves

Quiescent Phase

Neutrino‐Driven Convection/SASI Induced g‐Modes

Deceleration of Convective Plumes(Stochastic)

Correlated

3/29/2017 4Mueller, Janka, and Marek Ap.J. 766, 43 (2013)

3/29/2017 5Yakunin et al. 2015 PRD 92 084040 

Cessation of accretion corresponds to cessation of high‐frequency component of GW amplitude.

3/29/2017 6

Yakunin et al. 2015 PRD 92 084040 

Distinguish convection‐ and SASI‐dominated models by ratio of high‐ to low‐frequency power?• Andresen et al. 2017 arXiv:1607.05199

3/29/2017 7

Comparisons use same time window (from 3D) and temporal resolution (from 2D).Yakunin et al. 2017, arXiv:1701.07325v1  

See also Andresen et al. 2017 arXiv:1607.05199.

3/29/2017 8

Collapse

Bounce

Ring Down

Kuroda, Takiwaki, and Kotake PRD 89 044011 (2014)

What happens at late times?