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A blue point source at the location of supernova 2011DH

Universidad de Chile. Repositorio Académico

Título A blue point source at the location of supernova 2011DH
Autor Nozawa, Takaya
Nomoto, Ken’ichi
Quimby, Robert M.
Maeda, Keiichi
Van Dyk, Schuyler D.
Folatelli, Gaston
Bersten, Melina C.
Kuncarayakti, Hanindyo
Benvenuto, Omar
Hamuy Wackenhut, Mario Andrés
Tema binaries: close
Descripción Artículo de publicación ISI
We present Hubble Space Telescope (HST) observations of the field of the Type IIb supernova (SN) 2011dh in
M51 performed at ≈1161 rest-frame days after explosion using the Wide Field Camera 3 and near-UV filters
F225W and F336W. A star-like object is detected in both bands and the photometry indicates it has negative
(F225W − F336W) color. The observed object is compatible with the companion of the now-vanished yellow
supergiant progenitor predicted in interacting binary models. We consider it unlikely that the SN is undergoing
strong interaction and thus estimate that it makes a small contribution to the observed flux. The possibilities of
having detected an unresolved light echo or an unrelated object are briefly discussed and judged unlikely. Adopting
a possible range of extinction by dust, we constrain parameters of the proposed binary system. In particular, the
efficiency of mass accretion onto the binary companion must be below 50%, if no significant extinction is produced
by newly formed dust. Further multiband observations are required in order to confirm the identification of the
object as the companion star. If confirmed, the companion star would already be dominant in the UV–optical
regime, so it would readily provide a unique opportunity to perform a detailed study of its properties.
Fecha 2014-09-23T13:32:08Z
Tipo Artículo de revista
Enlace The Astrophysical Journal Letters, 793:L22 (5pp), 2014 October 1
Idioma en
Publicador The American Astronomical Society