The search for failed supernovae with the Large Binocular Telescope: first candidates
Abstract
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 ΔνLν ≥ 104 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- July 2015
- DOI:
- 10.1093/mnras/stv776
- arXiv:
- arXiv:1411.1761
- Bibcode:
- 2015MNRAS.450.3289G
- Keywords:
-
- black hole physics;
- surveys;
- stars: massive;
- supernovae: general;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Accepted for publication in MNRAS