MONTE CARLO NEUTRINO TRANSPORT IN POST-MERGER DISKS S HERWOOD R - - PowerPoint PPT Presentation

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MONTE CARLO NEUTRINO TRANSPORT IN POST-MERGER DISKS S HERWOOD R - - PowerPoint PPT Presentation

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MONTE CARLO NEUTRINO TRANSPORT IN POST-MERGER DISKS S HERWOOD R ICHERS D AN K ASEN , E VAN OC ONNOR , R ODRIGO F ERNANDEZ , C HRISTIAN O TT Daniel Perley Daniel Perley NINJA-2 Catalog Daniel Perley NINJA-2 Catalog SHORT GRB M ERGING

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SLIDE 1

MONTE CARLO NEUTRINO TRANSPORT IN POST-MERGER DISKS

SHERWOOD RICHERS

DAN KASEN, EVAN O’CONNOR, RODRIGO FERNANDEZ, CHRISTIAN OTT

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SLIDE 2

Daniel Perley

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SLIDE 3

Daniel Perley NINJA-2 Catalog

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SLIDE 4

Daniel Perley NINJA-2 Catalog

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SLIDE 5

SHORT GRB

  • MERGING COMPACT OBJECTS

(LEE & RAMIREZ-RUIZ 2007)

  • COLLIMATED JET
  • 𝑀𝑗𝑑𝑝 β‰ˆ 1053 ERG/S

(E.G. BLOOM+ 2003)

  • DISK COOLS VIA NEUTRINOS
  • 𝑒𝑒𝑗𝑔𝑔 β‰ͺ π‘’π‘’π‘§π‘œ

Metzger & Berger (2011)

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SLIDE 6

NEUTRINOS

  • ABSORB/EMIT
  • DEPOSIT/EMIT ENERGY
  • CHANGE YE
  • SCATTER
  • TRAP NEUTRINOS
  • REDISTRIBUTE ENERGY
  • ANNIHILATE/EMIT
  • DEPOSIT/EMIT ENERGY

Ξ½e n p

e

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SLIDE 7

NEUTRINOS

  • ABSORB/EMIT
  • DEPOSIT/EMIT ENERGY
  • CHANGE YE
  • SCATTER
  • TRAP NEUTRINOS
  • REDISTRIBUTE ENERGY
  • ANNIHILATE/EMIT
  • DEPOSIT/EMIT ENERGY

Ξ½e n p

e

Ξ½e p p Ξ½e

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SLIDE 8

NEUTRINOS

  • ABSORB/EMIT
  • DEPOSIT/EMIT ENERGY
  • CHANGE YE
  • SCATTER
  • TRAP NEUTRINOS
  • REDISTRIBUTE ENERGY
  • ANNIHILATE/EMIT
  • DEPOSIT/EMIT ENERGY

Ξ½e n p

e

Ξ½e p p Ξ½e Ξ½e

e e

Ξ½e

_

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SLIDE 9
  • ABSORB/EMIT
  • DEPOSIT/EMIT ENERGY
  • CHANGE YE
  • SCATTER
  • TRAP NEUTRINOS
  • REDISTRIBUTE ENERGY
  • ANNIHILATE/EMIT
  • DEPOSIT/EMIT ENERGY

NEUTRINOS Ξ½e n p

e

Ξ½e p p Ξ½e Ξ½e

e e

Ξ½e

{ignoring oscillations}

_

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SLIDE 10

HOW TO MOVE NEUTRINOS

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SLIDE 11

SEDONU + NULIB

1)TAKE FLUID SNAPSHOT 2)EMIT 3)PROPAGATE 4)SCATTER AND ABSORB 5)CALCULATE:

  • TIMESCALES
  • ANNIHILATION RATES

NuLib

ρ T Ye EΞ½ Ξ΅ Οƒscat Οƒabs Rscat Rann Remit EOS

data: Metzger & Fernandez (2014)

log10(

𝜍 g/cm3 ) 8 7 6 5

Open-source!

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SLIDE 12

NuLib

ρ T Ye EΞ½ Ξ΅ Οƒscat Οƒabs Rscat Rann Remit EOS

log10(

𝜍 g/cm3 ) 8 7 6 5

SEDONU + NULIB

1)TAKE FLUID SNAPSHOT 2)EMIT 3)PROPAGATE 4)SCATTER AND ABSORB 5)CALCULATE:

  • TIMESCALES
  • ANNIHILATION RATES

data: Metzger & Fernandez (2014) Open-source!

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SLIDE 13

NuLib

ρ T Ye EΞ½ Ξ΅ Οƒscat Οƒabs Rscat Rann Remit EOS

log10(

𝜍 g/cm3 ) 8 7 6 5

SEDONU + NULIB

1)TAKE FLUID SNAPSHOT 2)EMIT 3)PROPAGATE 4)SCATTER AND ABSORB 5)CALCULATE:

  • TIMESCALES
  • ANNIHILATION RATES

data: Metzger & Fernandez (2014) Open-source!

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SLIDE 14

NuLib

ρ T Ye EΞ½ Ξ΅ Οƒscat Οƒabs Rscat Rann Remit EOS

log10(

𝜍 g/cm3 ) 8 7 6 5

SEDONU + NULIB

1)TAKE FLUID SNAPSHOT 2)EMIT 3)PROPAGATE 4)SCATTER AND ABSORB 5)CALCULATE:

  • TIMESCALES
  • ANNIHILATION RATES

data: Metzger & Fernandez (2014) Open-source!

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SLIDE 15

HOW DO NEUTRINOS LOOK?

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SLIDE 16

BH HMNS

ASYMMETRIC NEUTRINO RADIATION

Special relativity beams and hardens neutrinos

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SLIDE 17

BH HMNS

ASYMMETRIC NEUTRINO RADIATION

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SLIDE 18

SPECTRA

BH HMNS Escape spectra are not quite blackbody.

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SLIDE 19

WHAT DO NEUTRINOS DO?

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SLIDE 20

HEATING/COOLING RATE

Neutrinos cool equator And heat above disk π‘†πœ— = 1 πœ— π‘’πœ— 𝑒𝑒

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SLIDE 21

LEPTONIZATION RATE

𝑆𝑍

𝑓 = 𝑒𝑍

𝑓

𝑒𝑒 Neutrinos raise Electron fraction

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SLIDE 22

DOES LEAKAGE SUCK?

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SLIDE 23

COMPARISON TO LEAKAGE

1020 erg/g binding energy οƒ  stronger outflows

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SLIDE 24

COMPARISON TO LEAKAGE

HMNS BH

MC neutrinos escape more easily

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SLIDE 25

COMPARISON TO LEAKAGE

HMNS BH

MC neutrinos escape more easily

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SLIDE 26

CAN NEUTRINOS POWER A JET?

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SLIDE 27

ANNIHILATION

  • STRONG ANGULAR

DEPENDENCE

  • ALL SPECIES

PARTICIPATE

Ξ½ πœ‰

𝜾

𝑒𝑅+ ~ 𝐽 𝐽 𝐹 + 𝐹 1 βˆ’ cos πœ„ 2 𝑒𝐹 𝑒 𝐹 𝑒Ω 𝑒 Ξ©

log10(

𝜍 g/cm3 ) 8 7 6 5

Ruffert et al. (1997) data: Metzger & Fernandez (2014)

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SLIDE 28

ANNIHILATION

2 1 1 2

  • LARGE POLAR SPECIFIC HEATING
  • 3 Γ— 1046 ERG IN BH JET
  • 1048 βˆ’ 1050 ERG REQUIRED

(LEE & RAMIREZ-RUIZ 2007)

οƒ  JET IS UNLIKELY

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SLIDE 29

ANNIHILATION

2 1 1 2

  • LARGE POLAR SPECIFIC HEATING
  • 3 Γ— 1046 ERG IN BH JET
  • 2 Γ— 1048 ERG IN HMNS JET
  • 1048 βˆ’ 1050 ERG REQUIRED

(LEE & RAMIREZ-RUIZ 2007)

οƒ  JET IS UNLIKELY

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SLIDE 30

CONCLUSIONS

  • ANNIHILATION CANNOT

DRIVE JET (PROBABLY)

  • LEAKAGE LACKS SPECTRAL

AND ANGULAR EFFECTS

  • MC οƒ  FASTER COOLING

AND LEPTONIZATION

  • CAVEAT: NON-EQUILIBRIUM
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SLIDE 31

CONCLUSIONS

  • SEE THE PAPER!
  • ARXIV:1507.03606
  • SEE THE CODE!
  • BITBUCKET.ORG/SRICHERS/SEDONU
  • SEE THE PERSON!
  • TAPIR.CALTECH.EDU/~SRICHERS

SELF-PROMOTION

  • ANNIHILATION CANNOT

DRIVE JET (PROBABLY)

  • LEAKAGE LACKS SPECTRAL

AND ANGULAR EFFECTS

  • MC οƒ  FASTER COOLING

AND LEPTONIZATION

  • CAVEAT: NON-EQUILIBRIUM