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

SN 2013dy is a Type Ia supernova (SN Ia) for which we have compiled an extraordinary data set spanning from 0.1 to ∼ 500 d after explosion. We present 10 epochs of ultraviolet (UV) through near-infrared (NIR) spectra with <i>Hubble Space Telescope</i>/Space Telescope Imaging Spectrograph...

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Detalles Bibliográficos
Autores: Pan, Y. C., Foley, R. J., Kromer, M., Fox, O. D., Zheng, W., Challis, P., Clubb, K. I., Filippenko, A. V., Folatelli, Gastón, Graham, M. L., Hillebrandt, W., Kirshner, R. P., Lee, W. H., Pakmor, R., Patat, F., Phillips, M. M., Pignata, G., Röpke, F., Seitenzahl, I., Silverman, J. M., Simon, J. D., Sternberg, A., Stritzinger, M. D., Taubenberger, S., Vinko, J., Wheeler, J. C.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/93774
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/93774
Access Level:acceso abierto
Palabra clave:Astronomía
supernovae: general
supernovae: individual: SN 2013dy
Descripción
Sumario:SN 2013dy is a Type Ia supernova (SN Ia) for which we have compiled an extraordinary data set spanning from 0.1 to ∼ 500 d after explosion. We present 10 epochs of ultraviolet (UV) through near-infrared (NIR) spectra with <i>Hubble Space Telescope</i>/Space Telescope Imaging Spectrograph, 47 epochs of optical spectra (15 of them having high resolution), and more than 500 photometric observations in the <i>BVrRiIZYJH</i> bands. SN 2013dy has a broad and slowly declining light curve (Δm<sub>15</sub>(B) = 0.92 mag), shallow Si II λ 6355 absorption, and a low velocity gradient. We detect strong C II in our earliest spectra, probing unburned progenitor material in the outermost layers of the SN ejecta, but this feature fades within a few days. The UV continuum of SN 2013dy, which is strongly affected by the metal abundance of the progenitor star, suggests that SN 2013dy had a relatively high-metallicity progenitor. Examining one of the largest single set of high-resolution spectra for an 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 maximum luminosity of 10.0<sup>+4.8</sup><sub>-3.8</sub> × 10<sup>42</sup> erg s<sup>-1</sup>. We compare the synthetic light curves and spectra of several models to SN 2013dy, finding that SN 2013dy is in good agreement with a solar-metallicity W7 model.

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