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SN 2013dy is a Type Ia supernova for which we have compiled an extraordinarydataset spanning from 0.1 to ~ 500 days after explosion. We present 10 epochsof ultraviolet (UV) through near-infrared (NIR) spectra with HST/STIS, 47epochs of optical spectra (15 of them having high resolution), and more than500 photometric observations in the BVrRiIZYJH bands. SN 2013dy has a broad andslowly declining light curve (delta m(B) = 0.92 mag), shallow Si II 6355absorption, and a low velocity gradient. We detect strong C II in our earliestspectra, probing unburned progenitor material in the outermost layers of the SNejecta, but this feature fades within a few days. The UV continuum of SN2013dy, which is strongly affected by the metal abundance of the progenitorstar, suggests that SN 2013dy had a relatively high-metallicity progenitor.Examining one of the largest single set of high-resolution spectra for a SN Ia,we find no evidence of variable absorption from circumstellar material.Combining our UV spectra, NIR photometry, and high-cadence optical photometry,we construct a bolometric light curve, showing that SN 2013dy had a maximumluminosity of 10.0^{+4.8}_{-3.8} * 10^{42} erg/s. We compare the syntheticlight curves and spectra of several models to SN 2013dy, finding that SN 2013dyis in good agreement with a solar-metallicity W7 model.

500 Days of SN 2013dy: spectra and photometry from the ultraviolet to the infrared