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Did the progenitor of SN 2011dh have a binary companion?

Maund, J. R. and Arcavi, I. and Ergon, M. and Eldridge, J. J. and Georgy, C. and Cenko, S. B. and Horesh, A. and Izzard, R. G. and Stancliffe, R. J. (2015) Did the progenitor of SN 2011dh have a binary companion? Monthly Notices of the Royal Astronomical Society, 454 (3). pp. 2580-2585. ISSN 0035-8711.

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We present late-time Hubble Space Telescope ultraviolet (UV) and optical observations of the site of SN 2011dh in the galaxy M51, ∼1164  days post-explosion. At the supernova (SN) location, we observe a point source that is visible at all wavelengths, which is significantly fainter than the spectral energy distribution (SED) of the yellow supergiant progenitor observed prior to explosion. The previously reported photometry of the progenitor is, therefore, completely unaffected by any sources that may persist at the SN location after explosion. In comparison with the previously reported late-time photometric evolution of SN 2011dh, we find that the light curve has plateaued at all wavelengths. The SED of the late-time source is clearly inconsistent with an SED of stellar origin. Although the SED is bright at UV wavelengths, there is no strong evidence that the late-time luminosity originates solely from a stellar source corresponding to the binary companion, although a partial contribution to the observed UV flux from a companion star cannot be ruled out.

Item Type:Article
Related URLs:
URLURL TypeDescription
Maund, J. R.0000-0003-0733-7215
Arcavi, I.0000-0001-7090-4898
Cenko, S. B.0000-0003-1673-970X
Horesh, A.0000-0002-5936-1156
Additional Information:© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 September 7. Received 2015 September 6; in original form 2015 August 11. First published online October 13, 2015. We are very grateful to Anders Jerkstrand for providing us with access to his late-time model spectra of SN 2011dh. The research of JRM is supported by a Royal Society University Research Fellowship. CG acknowledges support from the European Research Council under the European Union's Seventh Framework Program (FP/2007-2013)/ERC Grant Agreement No. 306901. Based on observations made with the NASA/ESA Hubble Space Telescope, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programme GO-13433 and GO-13345. STSDAS and PYRAF are products of the Space Telescope Science Institute, which is operated by AURA for NASA.
Funding AgencyGrant Number
European Research Council (ERC)306901
NASANAS 5-26555
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
Subject Keywords:supernovae: general – supernovae: individual: 2011dh
Issue or Number:3
Record Number:CaltechAUTHORS:20160205-124049067
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Official Citation:J. R. Maund, I. Arcavi, M. Ergon, J. J. Eldridge, C. Georgy, S. B. Cenko, A. Horesh, R. G. Izzard, and R. J. Stancliffe Did the progenitor of SN 2011dh have a binary companion? MNRAS (December 11, 2015) Vol. 454 2580-2585 doi:10.1093/mnras/stv2098 First published online October 13, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64279
Deposited By: George Porter
Deposited On:08 Feb 2016 16:29
Last Modified:20 Nov 2019 05:36

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