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

AuthorCount:23;
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.

Fox, O. D. (author)
McCully, C. (author)
Phillips, M. M. (author)
Sand, D. J. (author)
Zheng, W. (author)
Challis, P. (author)
Filippenko, A. V. (author)
Folatelli, G. (author)
Hillebrandt, W. (author)
Hsiao, E. Y. (author)
Jha, S. W. (author)
Kirshner, R. P. (author)
Kromer, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mkrom (author)
Marion, G. H. (author)
Nelson, M. (author)
Pakmor, R. (author)
Pignata, G. (author)
Roepke, F. K. (author)
Seitenzahl, I. R. (author)
Silverman, J. M. (author)
Skrutskie, M. (author)
Stritzinger, M. D. (author)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)443:4, s. 2887-29060035-87111365-2966

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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