Bing Jiang, Astronomy Department, NJU 1 Progenitors of SN Ia : Circumstellar Interaction, Rotation, and Steady Interaction, Rotation, and Steady Hydrogen Burning Hydrogen Burning Nomoto, Suzuki, Deng, J.S., Uenishi & Hachisu astro-ph/ Nomoto, Suzuki, Deng, J.S., Uenishi & Hachisu astro-ph/ Published in " : Supernovae as Cosmological Lighthouses", ASP Conf. Ser. 342, (ASP), (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 Relatively uniform light curves and spectral evolution Redshift Major sources of Fe in the galacitc and cosmic chemical evolution The exact progenitor system and its evolution have not been identified yet Type Ia as a empirical standard candle

Bing Jiang, Astronomy Department, NJU 4 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 for a review) Nomoto, Iben, Tutukov, Webbink, Branch, Renzini, King, Hachisu SN 2002ic: a SN Ia, but has H Hαemission Controversial issues

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

Bing Jiang, Astronomy Department, NJU 6 SN 2002ic Discover on 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 Discover on 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 SN 2002ic

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

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

Bing Jiang, Astronomy Department, NJU 12 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 Possible progenitors of SN 2002ic

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

Bing Jiang, Astronomy Department, NJU 14