Publication Date:
2015-05-15
Description:
We are monitoring 27 galaxies within 10 Mpc using the Large Binocular Telescope to search for failed supernovae (SNe), massive stars that collapse to form a black hole without an SN explosion. We present the results from the first 4 yr of survey data, during which these galaxies were observed to produce three successful core-collapse SNe. We search for stars that have ‘vanished’ over the course of our survey, by examining all stars showing a decrease in luminosity of L ≥ 10 4 L from the first to the last observation. We also search for the low luminosity, long duration transients predicted by Lovegrove & Woosley ( 2013 ) for failed explosions of red supergiants. After analysing the first 4 yr of data in this first direct search for failed SNe, we are left with one candidate requiring further study. This candidate has an estimated mass of 18–25 M , a mass range likely associated with failed SNe and, if real, implies that failed SN represents a median fraction of f ~= 0.30 of core collapses, with symmetric 90 per cent confidence limits of 0.07 ≤ f ≤ 0.62. If follow up data eliminate this candidate, we find an upper limit on the fraction of core collapses leading to a failed SN of f 〈 0.40 at 90 per cent confidence. As the duration of the survey continues to increase, it will begin to constrain the f ~= 10–30 per cent failure rates needed to explain the deficit of massive SN progenitors and the observed black hole mass function.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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