Searching for Hydrogen in the Type Ib SN 1999dn

Details Searching for Hydrogen in the Type Ib SN 1999dn Searching for Hydrogen in the Type Ib SN 1999dn

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543020j&link_type=abstract

American Astronomical Society, AAS Meeting #215, #430.20; Bulletin of the American Astronomical Society, Vol. 42, p.359

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Scientific paper

We present synthetic spectral fits of the typical Type Ib SN 1999dn using the generalized non-local thermodynamic equilibrium stellar atmospheres code PHOENIX. We fit model spectra to five epochs of SN 1999dn ranging from ten days pre-maximum light to 17 days post maximum light. Our goal is to investigate the possibility of hydrogen in Type Ib Supernovae (SNe), specifically a feature around 6200Å which has previously been attributed to high velocity Hα. In earlier work Ketchum et al. (2007) concluded the most plausible alternative to Hα to be a blend of Si II and Fe II lines which can be adjusted to fit by increasing the metallicity. Our models assume a uniform solar composition with hydrogen burned to helium by 4H→He in order to conserve nucleon number. For hydrogen models we replace the outer part of the model with another shell of true solar composition (with hydrogen) above a specified velocity. The approximate hydrogen mass of the standard solar composition shell is MH ≤ 10-3 M&sun;. Our models fit the observed spectra reasonably well, successfully reproducing most features including the characteristic He I absorptions. The hydrogen feature in SN 1999dn is clear but more extreme cases exist. Future work will examine the spectra of these more extreme cases.
This work was supported in part by NSF grant AST-0707704 and Department of Energy Award Number DE-FG02-07ER41517.

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