The Absolute Magnitudes of Type Ia Supernovae in the Ultraviolet
Author
Brown, Peter J.
Roming, Peter W. A.
Milne, Peter
Bufano, Filomena
Ciardullo, Robin
Elias-Rosa, Nancy
Filippenko, Alexei V.
Foley, Ryan J.
Gehrels, Neil
Gronwall, Caryl
Hicken, Malcolm
Holland, Stephen T.
Hoversten, Erik A.
Immler, Stefan
Kirshner, Robert P.
Li, Weidong
Mazzali, Paolo
Phillips, Mark M.
Pritchard, Tyler
Still, Martin
Turatto, Massimo
Berk, Daniel Vanden
Published Version
https://doi.org/10.1088/0004-637X/721/2/1608Metadata
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Brown, Peter J., Peter W. A. Roming, Peter Milne, Filomena Bufano, Robin Ciardullo, Nancy Elias-Rosa, Alexei V. Filippenko, et al. 2010. “THE ABSOLUTE MAGNITUDES OF TYPE Ia SUPERNOVAE IN THE ULTRAVIOLET.” The Astrophysical Journal 721 (2): 1608–26. https://doi.org/10.1088/0004-637x/721/2/1608.Abstract
We examine the absolute magnitudes and light-curve shapes of 14 nearby (redshift z = 0.004-0.027) Type Ia supernovae (SNe Ia) observed in the ultraviolet (UV) with the Swift Ultraviolet/Optical Telescope. Colors and absolute magnitudes are calculated using both a standard Milky Way extinction law and one for the Large Magellanic Cloud that has been modified by circumstellar scattering. We find very different behavior in the near-UV filters (uvw1(rc) covering similar to 2600-3300 (A) over circle after removing optical light, and u approximate to 3000-4000 (A) over circle) compared to a mid-UV filter (uvm2 approximate to 2000-2400 (A) over circle). The uvw1(rc) - b colors show a scatter of similar to 0.3 mag while uvm2-b scatters by nearly 0.9 mag. Similarly, while the scatter in colors between neighboring filters is small in the optical and somewhat larger in the near-UV, the large scatter in the uvm2 - uvw1 colors implies significantly larger spectral variability below 2600 (A) over circle. We find that in the near-UV the absolute magnitudes at peak brightness of normal SNe Ia in our sample are correlated with the optical decay rate with a scatter of 0.4 mag, comparable to that found for the optical in our sample. However, in the mid-UV the scatter is larger, similar to 1 mag, possibly indicating differences in metallicity. We find no strong correlation between either the UV light-curve shapes or the UV colors and the UV absolute magnitudes. With larger samples, the UV luminosity might be useful as an additional constraint to help determine distance, extinction, and metallicity in order to improve the utility of SNe Ia as standardized candles.Terms of Use
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http://nrs.harvard.edu/urn-3:HUL.InstRepos:41399763
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