Faint Core-Collapse Supernovae with Fallback Takashi Moriya (IPMU, - - PowerPoint PPT Presentation

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faint core collapse supernovae with fallback
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Faint Core-Collapse Supernovae with Fallback Takashi Moriya (IPMU, - - PowerPoint PPT Presentation

Feb 25, 2023 385 likes •481 views

Faint Core-Collapse Supernovae with Fallback Takashi Moriya (IPMU, University of Tokyo) N. Tominaga (Konan Univ.), M. Tanaka (IPMU), K. Nomoto (IPMU), D. Sauer (Stockholm Univ.), P . Mazzali (MPA), & Maeda (IPMU) long GRBs - death of

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SLIDE 1

Faint Core-Collapse Supernovae with Fallback

Takashi Moriya (IPMU, University of Tokyo)

  • N. Tominaga (Konan Univ.), M. Tanaka (IPMU), K. Nomoto (IPMU),
  • D. Sauer (Stockholm Univ.), P

. Mazzali (MPA), & Maeda (IPMU)

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SLIDE 2

long GRBs - death of massive stars

  • collapsar?
  • magnetar?
  • SN-GRB connection

4000 5000 6000 7000 8000 9000 10000 Rest Wavelength (Å) 1 2 3 4 5 Flux (f) + constant 1.39 Day 2.33 5.2 6.1 7.0 3.3 4.3 11.0 21.2

GRB 100316D/ SN 2010bh

Ages in rest frame time after BAT trigger

Chornock et al. (2010)

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SLIDE 3

long GRBs without a supernova

  • GRB 060614 (Della Valle et al. 2006)
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SLIDE 4

why?

  • some long GRBs not associated with death of massive stars?
  • an alternative mechanism for long GRBs not related to death of stars?
  • associated SNe are too faint to be observed?
  • the SNe must be as faint as - 16 mag at maximum (case of GRB060614)
  • such faint type Ic SNe have not been discovered
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SLIDE 5

normal Type Ia (SN 2003du) SN 2008ha SN 2002cx Over luminous Type Ia (SN 1991T)

discovery of the missing piece: SN 2008ha

  • very faint (Valenti et al. 2009; Foley et al. 2009)
  • ~ -14 mag at maximum
  • a peculiar type Ia SN?
  • too small expected ejecta mass (~ 0.1 Msun)
  • a core-collapse SN?
  • a very faint type Ic SN?
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SLIDE 6

how a type Ic SN becomes faint?

C + O 1. 5. 2. 3. 4.

Injection of energy Propagation of shock Inner layer does not exceed escape velocity Ejection of the outer layer

Fallback

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SLIDE 7

SN 2008ha: a faint core-collapse SN with fallback

  • numerical calculations
  • hydrodynamics, nucleosynthesis, & radiation transport
  • It Works!
  • a core-collapse model of SN 2008ha
  • 14
  • 13.5
  • 13
  • 12.5
  • 12
  • 11.5
  • 11

10 20 30 40 50 60 70 absolute bolometric magnitude days Bolometric LC 13COG 13CO(269) 13CO(276) 1000 2000 3000 4000 5000 6000 7000 8000 10 20 30 40 50 velocity (km s-1) days since the explosion Photospheric velocity (13COG) Photospheric velocity (25CO: LC fitted) Na I D O I 7774

MMS = 13 M⊙ => MpreSN = 2.7 M⊙ Ekin = 1.2 × 1048erg, Mej = 0.074 M⊙, MNi56 = 0.003 M⊙

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SLIDE 8

conclusion

long GRBs without observed SNe: the associated SNe were just too faint!

long GRBs without observed SNe are also related to death of massive stars