Extensive HST ultraviolet spectra and multiwavelength observations of SN 2014J in M82 indicate reddening and circumstellar scattering by typical dust
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2014
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Facultad/escuela
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es
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Oxford University Press
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Atribution 4.0 International (CC BY 4.0) y
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https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
SN 2014J in M82 is the closest detected Type Ia supernova (SN Ia) in at least 28 yr and perhaps
in 410 yr. Despite its small distance of 3.3 Mpc, SN 2014J is surprisingly faint, peaking at
V = 10.6 mag, and assuming a typical SN Ia luminosity, we infer an observed visual extinction
of AV = 2.0 ± 0.1 mag. But this picture, with RV = 1.6 ± 0.2, is too simple to account for all
observations. We combine 10 epochs (spanning a month) of HST/Space Telescope Imaging
Spectrograph (STIS) ultraviolet through near-infrared spectroscopy with HST/Wide Field
Camera 3 (WFC3), Katzman Automatic Imaging Telescope, and FanCam photometry from
the optical to the infrared and nine epochs of high-resolution TRES (Tillinghast Reflection
Echelle Spectrograph) spectroscopy to investigate the sources of extinction and reddening for
SN 2014J. We argue that the wide range of observed properties for SN 2014J is caused by
a combination of dust reddening, likely originating in the interstellar medium of M82, and
scattering off circumstellar material. For this model, roughly half of the extinction is caused
by reddening from typical dust (E(B − V) = 0.45 mag and RV = 2.6) and roughly half by
scattering off Large Magellanic Cloud-like dust in the circumstellar environment of SN 2014J.
Notas
Indexación: Scopus.
Palabras clave
Supernovae: General, Supernovae: Individual: SN 2014J, Dust, Extinction, Galaxies: Individual: M82
Citación
Monthly Notices of the Royal Astronomical Society. Volume 443, Issue 4, Pages 2887 - 2906. 2014
DOI
10.1093/mnras/stu1378