Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 680, Issue 1, Pages L33-L36Publisher
IOP PUBLISHING LTD
DOI: 10.1086/589832
Keywords
binaries : close; supernova remnants; supernovae : general; X-rays : ISM
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We propose a new method to measure the metallicity of Type Ia supernova progenitors using Mn and Cr lines in the X-ray spectra of young supernova remnants. We show that the Mn-to-Cr mass ratio in Type Ia supernova ejecta is tightly correlated with the initial metallicity of the progenitor, as determined by the neutron excess of the white dwarf material before thermonuclear runaway. We use this correlation, together with the flux of the Cr and Mn K alpha X-ray lines in the Tycho supernova remnant recently detected by Suzaku, to derive a metallicity of log (Z) = 1.32(-0.33)(+0.67) for the progenitor of this supernova, which corresponds to log (Z/Z(circle dot)) = 0.60(-0.60)(+0.31) according to the latest determination of the solar metallicity by Asplund and coworkers. The uncertainty in the measurement is large, but metallicities much smaller than the solar value can be confidently discarded. We discuss the implications of this result for future research on Type Ia supernova progenitors.
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