Spitzer Measurements of Atomic and Molecular Abundances in the Type IIP SN 2005af

We present results based on mid-infrared (3.6-30 μm) observations with the Spitzer Space Telescope of the nearby Type IIP supernova 2005af. We report the first ever detection of the SiO molecule in a Type IIP supernova. Together with the detection of the CO fundamental, this is an exciting finding as it may signal the onset of dust condensation in the ejecta. From a wealth of fine-structure lines we provide abundance estimates for stable Ni, Ar, and Ne that, via spectral synthesis, may be used to constrain nucleosynthesis models.

[1]  Optical polarimetric monitoring of the type II-plateau SN 2005af , 2006, astro-ph/0604511.

[2]  R. Kotak,et al.  Early-Time Spitzer Observations of the Type II Plateau Supernova SN 2004dj , 2005, astro-ph/0506407.

[3]  Explosive Yields of Massive Stars from Z = 0 to Z = Z? , 2004, astro-ph/0402625.

[4]  D. O. Astronomy,et al.  Dust in the Early Universe: Dust Formation in the Ejecta of Population III Supernovae , 2003, astro-ph/0307108.

[5]  M. Hamuy Observed and Physical Properties of Core-Collapse Supernovae , 2002, astro-ph/0209174.

[6]  J. Halenka,et al.  Tables of the partition functions for nickel, Ni I - Ni X , 2002, astro-ph/0201238.

[7]  P. Ferrara Dust Formation in Primordial Type II Supernovae , 2000, astro-ph/0009176.

[8]  ApJ, in press , 1999 .

[9]  A. Dalgarno,et al.  Formation and Destruction of Silicon Monoxide in SN 1987A , 1996 .

[10]  S. Woosley,et al.  The Evolution and Explosion of Massive Stars. II. Explosive Hydrodynamics and Nucleosynthesis , 1995 .

[11]  Masa-Aki Hashimoto,et al.  Core-Collapse Supernovae and Their Ejecta , 1995 .

[12]  A. Dalgarno,et al.  Silicon Monoxide in SN 1987A , 1994 .

[13]  Martin G. Cohen,et al.  Airborne Spectrophotometry of SN 1987A from 1.7 to 12.6 Microns: Time History of the Dust Continuum and Line Emission , 1993 .

[14]  P. Roche,et al.  The evolution of the 8 – 13 µm spectrum of supernova 1987A , 1993 .

[15]  P. Roche,et al.  Silicon monoxide in Supernova 1987A , 1991 .

[16]  D. Hollenbach,et al.  Velocity-resolved far-infrared spectra of forbidden Fe II - Evidence for mixing and clumping in SN 1987A , 1990 .

[17]  R. Chevalier,et al.  Late emission from supernovae - A window on stellar nucleosynthesis , 1989 .

[18]  P. Pinto,et al.  Spectral line profiles of nickel and argon in supernova 1987A - Expansion velocity and electron scattering effects , 1989 .

[19]  D. Osterbrock,et al.  Astrophysics of Gaseous Nebulae and Active Galactic Nuclei , 1989 .

[20]  W. Baan Powerful extragalactic masers , 1985, Nature.

[21]  G. Vaucouleurs,et al.  Hubble ratio and solar motion from 300 spirals having distances derived from H I line widths , 1981 .

[22]  A. Irwin Polynomial partition function approximations of 344 atomic and molecular species. , 1981 .