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We present the first maximum-light ultraviolet (UV) through near-infrared(NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv wasobtained nearly simultaneously by the Hubble Space Telescope at UV/opticalwavelengths and the Magellan Baade telescope at NIR wavelengths. These dataprovide the opportunity to examine the entire maximum-light SN Iaspectral-energy distribution. Since the UV region of a SN Ia spectrum isextremely sensitive to the composition of the outer layers of the explosion,which are transparent at longer wavelengths, this unprecedented spectrum canprovide strong constraints on the composition of the SN ejecta, and similarlythe SN explosion and progenitor system. SN 2011iv is spectroscopically normal,but has a relatively fast decline (Delta m_15 (B) = 1.69 +/- 0.05 mag). Wecompare SN 2011iv to other SNe Ia with UV spectra near maximum light andexamine trends between UV spectral properties, light-curve shape, and ejectavelocity. We tentatively find that SNe with similar light-curve shapes butdifferent ejecta velocities have similar UV spectra, while those with similarejecta velocities but different light-curve shapes have very different UVspectra. Through a comparison with explosion models, we find that both asolar-metallicity W7 and a zero-metallicity delayed-detonation model provide areasonable fit to the spectrum of SN 2011iv from the UV to the NIR.

The First Maximum-Light Ultraviolet through Near-Infrared Spectrum of a Type Ia Supernova