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Progenitors of SN Ia : Circumstellar Interaction, Rotation, and Steady Hydrogen Burning

Progenitors of SN Ia : Circumstellar Interaction, Rotation, and Steady Hydrogen Burning. Nomoto, Suzuki, Deng, J.S., Uenishi & Hachisu astro-ph/0603432 Published in "1604-2004: Supernovae as Cosmological Lighthouses", ASP Conf. Ser. 342, (ASP), 105-114 (2005).

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Progenitors of SN Ia : Circumstellar Interaction, Rotation, and Steady Hydrogen Burning

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  1. Progenitors of SN Ia : Circumstellar Interaction, Rotation, and Steady Hydrogen Burning Nomoto, Suzuki, Deng, J.S., Uenishi & Hachisuastro-ph/0603432Published in "1604-2004: Supernovae as Cosmological Lighthouses", ASP Conf. Ser. 342, (ASP), 105-114 (2005) Bing Jiang,Astronomy Department, NJU

  2. Most favoured scenario for Type Ia SN system • Lack of H • Prominent Si line near maximum light • Thermonuclear exposion of accreting WD in binary • surpassing Mch=1.44 Msun Bing Jiang,Astronomy Department, NJU

  3. Type Ia as a empirical standard candle • Relatively uniform light curves and spectral evolution • Redshift 0.1-1 • Major sources of Fe in the galacitc and cosmic chemical evolution • The exact progenitor system and its evolution have not been identified yet Bing Jiang,Astronomy Department, NJU

  4. Controversial issues • Ch mass WD model vs. sub-Ch mass model • DD model vs. SD model • DD: double degenerate (merging of double CO WDs) • SD: single degenerate • (Branch et al. 1995 for a review) • Nomoto, Iben, Tutukov, Webbink, Branch, Renzini, King, Hachisu • SN 2002ic: a SN Ia, but has H Hαemission Bing Jiang,Astronomy Department, NJU

  5. The paper focus on • The circumstellar interaction in SN 2002ic • Possible progenitor system of it Bing Jiang,Astronomy Department, NJU

  6. SN 2002ic • Discover on 2002. 11.13 • Hamuy, et al. 2003, Nature • SN Ia • Double component Hαemission • =>SN IIn? Bing Jiang,Astronomy Department, NJU

  7. SN 2002ic • Or some of SN IIn actually is SN Ia? • SN 1997cy is among the most luminous SNe discovered so far, and is suspected to be related to a GRB(Germany et al., 2000) Bing Jiang,Astronomy Department, NJU

  8. SN 2002ic Bing Jiang,Astronomy Department, NJU

  9. SN 2002ic • Discover on 2002. 11.13 • Hamuy, et al. 2003, Nature • SN Ia • Double component Hαemission • =>SN IIn? • Interaction between SN ejecta and a dense H-rich circumstellar medium(CSM) the first SN Ia to show direct evidence of CS gas ejected by the progenitor system Bing Jiang,Astronomy Department, NJU

  10. CSM interaction of SN Ia • Accretion wind in a SD model (Hachisu et al. 1996, 1999) • dot{M} up to 10^-4 Msun/yr • Vw up to 2000 km/s Bing Jiang,Astronomy Department, NJU

  11. Nomoto’s calulation • Assuming: • eject: W7, E=1.3*10^51 erg • density: ρ=ρo(r/Ro)-n g/cm^3 • M(CSM) ~ 1.3 Msun • CSM->aspherical Bing Jiang,Astronomy Department, NJU

  12. Possible progenitors of SN 2002ic • Single star scenario: Type I+1/2 SNe in AGB stars whose CO core is close to Ch mass • Wind: AGB star • Aspherical CSM: pre-existing clumpy disk • Binary scenario: typical WD-SD model • Wind: accretion wind • CSM is aspherical Bing Jiang,Astronomy Department, NJU

  13. Possible progenitors of SN 2002ic • Merging WDs and rotation • calculation of the evolution of WDs with rotation in 1D • Piersanti et al. 2003 & Saio and Nomoto (2004) • Surface Hydrogen Burning Models Bing Jiang,Astronomy Department, NJU

  14. Thank you! Bing Jiang,Astronomy Department, NJU

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