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An excess of mid-infrared emission from the type Iax SN 2014dt

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dc.contributor.author Fox, O. D
dc.contributor.author Johansson, J
dc.contributor.author Kasliwal, M
dc.contributor.author Andrews, J
dc.contributor.author Bally, J
dc.contributor.author Bond, H. E
dc.contributor.author Boyer, M. L
dc.contributor.author Gehrz, R. D
dc.contributor.author Helou, G
dc.contributor.author Hsiao, E. Y
dc.contributor.author Masci, F. J
dc.contributor.author Parthasarathy, M
dc.contributor.author Smith, N
dc.contributor.author Tinyanont, S
dc.contributor.author Van Dyk, S. D
dc.date.accessioned 2020-11-17T13:56:18Z
dc.date.available 2020-11-17T13:56:18Z
dc.date.issued 2016-01
dc.identifier.citation The Astrophysical Journal Letters. Vol. 816, No. 1, L13 en_US
dc.identifier.issn 2041-8205
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7086
dc.description Restricted Access © The American Astronomical Society http://dx.doi.org/10.3847/2041-8205/816/1/L13 en_US
dc.description.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 fl uxes of more normal SNe Ia. This excess is consistent with 10 − 5 M of newly formed dust, which would be the fi rst 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 signi fi cant 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. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Circumstellar matter en_US
dc.subject Dust, extinction en_US
dc.subject Infrared: stars en_US
dc.subject Supernovae: general en_US
dc.subject Supernovae: individual (SN 2014dt) en_US
dc.title An excess of mid-infrared emission from the type Iax SN 2014dt en_US
dc.type Article en_US


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