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Title: An excess of mid-infrared emission from the type Iax SN 2014dt
Authors: Fox, O. D
Johansson, J
Kasliwal, M
Andrews, J
Bally, J
Bond, H. E
Boyer, M. L
Gehrz, R. D
Helou, G
Hsiao, E. Y
Masci, F. J
Parthasarathy, M
Smith, N
Tinyanont, S
Van Dyk, S. D
Keywords: Circumstellar matter;Dust, extinction;Infrared: stars;Supernovae: general;Supernovae: individual (SN 2014dt)
Issue Date: 1-Jan-2016
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters. Vol. 816, No. 1, L13
Abstract: Supernovae Type Iax (SNe Iax) are less energetic and less luminous than typical thermonuclear explosions. A suggested explanation for the observed characteristics of this subclass is a binary progenitor system consisting of a CO white dwarf primary accreting from a helium star companion. A single-degenerate explosion channel might be expected to result in a dense circumstellar medium (CSM), although no evidence for such a CSM has yet been observed for this subclass. Here we present recent Spitzer observations of the SN Iax 2014dt obtained by the SPIRITS program nearly one year post-explosion that reveal a strong mid-IR excess over the expected fluxes of more normal SNe Ia. This excess is consistent with 10−5 M⊙ of newly formed dust, which would be the first time that newly formed dust has been observed to form in a Type Ia. The excess, however, is also consistent with a dusty CSM that was likely formed in pre-explosion mass-loss, thereby suggesting a single degenerate progenitor system. Compared to other SNe Ia that show significant shock interaction (SNe Ia-CSM) and interacting core-collapse events (SNe IIn), this dust shell in SN 2014dt is less massive. We consider the implications that such a pre-existing dust shell has for the progenitor system, including a binary system with a mass donor that is a red giant, a red supergiant, or an asymptotic giant branch star.
Description: Restricted Access
ISSN: 2041-8205
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Appears in Collections:IIAP Publications

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