Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 369, Issue 1, Pages L32-L36Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1745-3933.2006.00168.x
Keywords
binaries : general; stars : evolution; supernovae : general; supernovae : individual : SN 2001ig; galaxies : individual : NGC 7424
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We present images taken with the Gemini Multi-Object Spectrograph on Gemini-South, in excellent (< 0.5 arcsec) seeing, of supernova (SN) 2001ig in NGC 7424, similar to 1000 d after explosion. A point source seen at the site of the SN is shown to have colours inconsistent with being an HII region or a SN 1993J-like remnant, but can be matched to a late-B through late-F supergiant with A(V) < 1. We believe this object is the massive binary companion responsible for periodic modulation in mass-loss material around the Wolf - Rayet progenitor which gave rise to significant structure in the SN radio light curve.
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