Extensive HST ultraviolet spectra and multiwavelength observations of SN 2014J in M82 indicate reddening and circumstellar scattering by typical dust

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 A V = 2.0 ± 0...

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Bibliographic Details
Published in:	Monthly notices of the Royal Astronomical Society 2014-10, Vol.443 (4), p.2887-2906
Main Authors:	Foley, Ryan J, Fox, O. D, McCully, C, Phillips, M. M, Sand, D. J, Zheng, W, Challis, P, Filippenko, A. V, Folatelli, G, Hillebrandt, W, Hsiao, E. Y, Jha, S. W, Kirshner, R. P, Kromer, M, Marion, G. H, Nelson, M, Pakmor, R, Pignata, G, Röpke, F. K, Seitenzahl, I. R, Silverman, J. M, Skrutskie, M, Stritzinger, M. D
Format:	Article
Language:	eng
Subjects:	dust extinction galaxies: individual: M82 Luminosity Scattering Space telescopes Star & galaxy formation Supernovae supernovae: general supernovae: individual: SN 2014J Ultraviolet astronomy
Online Access:	Get full text
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Summary:	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 A V = 2.0 ± 0.1 mag. But this picture, with R V = 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 R V = 2.6) and roughly half by scattering off Large Magellanic Cloud-like dust in the circumstellar environment of SN 2014J.
ISSN:	0035-8711 1365-2966 1365-2966