SIMBAD references

2017MNRAS.468.4968A - Mon. Not. R. Astron. Soc., 468, 4968-4981 (2017/July-2)

The search for failed supernovae with the Large Binocular Telescope: confirmation of a disappearing star.


Abstract (from CDS):

We present Hubble Space Telescope imaging confirming the optical disappearance of the failed supernova (SN) candidate identified by Gerke, Kochanek & Stanek. This ∼25 M red supergiant experienced a weak ∼106 L optical outburst in 2009 and is now at least 5 mag fainter than the progenitor in the optical. The mid-IR flux has slowly decreased to the lowest levels since the first measurements in 2004. There is faint (2000-3000 L) near-IR emission likely associated with the source. We find the late-time evolution of the source to be inconsistent with obscuration from an ejected, dusty shell. Models of the spectral energy distribution indicate that the remaining bolometric luminosity is >6 times fainter than that of the progenitor and is decreasing as ∼t–4/3. We conclude that the transient is unlikely to be an SN impostor or stellar merger. The event is consistent with the ejection of the envelope of a red supergiant in a failed SN and the late-time emission could be powered by fallback accretion on to a newly formed black hole. Future IR and X-ray observations are needed to confirm this interpretation of the fate for the star.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): black hole physics - stars: massive - supernovae: individual: N6946-BH1 - supernovae: individual: N6946-BH1

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 8

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