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Faint Supernova or Super-AGB star?: SN 2008S in context

Faint Supernova or Super-AGB star?: SN 2008S in context. Margaret Meixner STScI Masaaki Otsuka STScI/ASIAA David Riebel JHU SEEDS consortium. SN2008S: Spitzer IRAC 3.6 micron. Day 17. Day 180. Wesson et al. (2009).

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Faint Supernova or Super-AGB star?: SN 2008S in context

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  1. Faint Supernova or Super-AGB star?: SN 2008S in context Margaret Meixner STScI Masaaki Otsuka STScI/ASIAA David Riebel JHU SEEDS consortium

  2. SN2008S: Spitzer IRAC 3.6 micron Day 17 Day 180 Wesson et al. (2009)

  3. WHIRC (WIYN High Resolution InfraRed Camera) field: SN 2008S & SN 2002hh Otsuka et al. submitted

  4. SEEDS: The Search for Evolution of Emission from Dust in Supernovae • Science Goal is to quantify the rate of dust production in Type-II SNe • Track Type-II SNe light curves to very late times and look for simultaneous 3 observational signatures: • Sudden dimming of optical light (HST) • Brightening of mid-IR light (Spitzer) • Blue shifting of spectral lines (Hα, Gemini GMOS)

  5. SN2008S Near-IR light curve Otsuka et al. submitted

  6. SN2008S Near-IR light curve Otsuka et al. submitted

  7. SN2008S Near-IR light curve Otsuka et al. submitted

  8. SN2008S: a faint supernova? Otsuka et al. submitted

  9. SEEDS sample & progenitor mass

  10. SEEDS sample & light echo

  11. SEEDS sample & dust production

  12. SN2008S: a Super-AGB star? comparison to AGB stars in LMC Riebel & Meixner 2011

  13. SN2008S: a Super-AGB star? comparison to AGB stars in LMC Riebel & Meixner 2011

  14. SN2008S: Progenitor SED modelcarbon rich super-AGB star T~380 K L~3.2×104L M~10 M Mloss~5x10-7 M yr-1 Mtot~0.01 M Amorphous carbon Silicates Wesson et al. (2009)

  15. SN 2008S illumination Day 180 Day 17 Wesson et al. (2009)

  16. SN2008S: Day 17 SED T~550 K L~2.2×106 L LTOT~1.5×107 L Amorphous carbon Wesson et al. (2009)

  17. SN2008S: Day 180 SED T~450 K L~3.6×105 L LTOT~1.2×106 L Amorphous carbon Wesson et al. (2009)

  18. Stellar Sources of Dust: Massive Stars Herschel & Characteristics of Dust in Galaxies - Meixner

  19. Conclusions: SN 2008S • Most likely a Super-AGB star • T~380 K • L~3.2×104L • M~10 M • Mloss~5x10-7 M yr-1 • Mtot~0.01 M (2x104yr) • Carbon rich circumstellar dust, interesting, unusual • Significant dust contributor in galaxies: • Dust produced in “pre-explosion” phase • Massive enough could evolve fast enough to be important in early universe • May not destroy its own dust as with SNe • Important to keep monitoring this field to see if we recover a progenitor

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