• Constraining the progenitor companion of the nearby Type Ia SN 2011fe with a nebular spectrum at +981 d
    with M. L. Graham, P. E. Nugent, A. V. Filippenko, S. B. Cenko, J. M. Silverman, K. I. Clubb, and W. Zheng
    © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.We present an optical nebular spectrum of the nearby Type Ia supernova 2011fe, obtained 981 d after explosion. SN 2011fe exhibits little evolution since the +593 d optical spectrum, but there are several curious aspects in this new extremely late-time regime. We suggest that the persistence of the ~5800 Å feature is due to Na I D, and that a new emission feature at ~7300 Å may be [Ca II]. Also, we…Read more