A second case of variable NaI D lines in a highly reddened type Ia supernova

S. Blondin, J. L. Prieto, F. Patat, P. Challis, M. Hicken, R. P. Kirshner, T. Matheson, M. Modjaz

    Research output: Contribution to journalArticlepeer-review


    Recent high-resolution spectra of the Type Ia supernova SN 2006X have revealed the presence of time-variable and blueshifted Na I D features, interpreted by Patat et al. as originating in circumstellar material within the progenitor system. The variation seen in SN 2006X induces relatively large changes in the total Na I D equivalent width (ΔEW 0.5 Å in just over two weeks) that would be detectable at lower resolutions. We have used a large data set comprising 2400 low-resolution spectra of 450 Type Ia supernovae (SNe Ia) obtained by the CfA Supernova Program to search for variable Na I D features. Out of the 31 SNe Ia (including SN 2006X) in which we could have detected similar EW variations, only one other (SN 1999cl) shows variable Na I D features, with an even larger change over a similar 10 day timescale (ΔEW = 1.66 ± 0.21 Å). Interestingly, both SN 1999cl and SN 2006X are the two most highly reddened objects in our sample, raising the possibility that the variability is connected to dusty environments.

    Original languageEnglish (US)
    Pages (from-to)207-215
    Number of pages9
    JournalAstrophysical Journal
    Issue number1
    StatePublished - Mar 1 2009


    • circumstellar matter
    • dust
    • extinction
    • supernovae: general

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science


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