Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331204w&link_type=abstract
American Astronomical Society, AAS Meeting #213, #312.04; Bulletin of the American Astronomical Society, Vol. 41, p.289
Other
Scientific paper
We present extensive photometry in ultraviolet(UV), optical, and near-infrared (NIR) bands as well as dense sampling of optical spectroscopy for the normal type Ia supernova (SN Ia) 2005cf. A mass of optical photometry, performed at eight different telescopes, shows a rms scatter < 0.03 mag after proper corrections for the instrument responses. From the well-sampled light curves, we find that SN 2005cf reached a B-band maximum at 13.64+/-0.02 mag on JD 2453533.66+/-0.28, with a luminosity decline rate dm_15(B)=1.05+/-0.03 mag and a host galaxy reddening E(B - V)_host=0.10+/-0.03 mag. The UV photometry was obtained with HST and Swift UVOT, respectively, and they match each other to within 0.1-0.2 mag. The UV light curves show similar evolution to the broadband U, with an exception in the 2000-2500 Angstrom spectral range, where the light curve appears broader and much fainter than that on either side. Combining the UV data with the ground based optical and NIR data, we established the generic uvoir bolometric light curve for SN 2005cf and derived the bolometric corrections in the absence of UV and/or NIR data. The spectra of SN 2005cf at early times displayed strong, high-velocity (HV) features in Ca II H\&K doublet and NIR triplet, which were distinctly detached from the photosphere (v 10,500 km s^{-1}) at a velocity ranging from 19,000 to 24,000 km s^{-1}. One interesting feature is the flat-bottomed absorption feature observed near 6000 A in the earliest spectrum, which rapidly evolved into a triangular shape and then became a normal Si II 6355 absorption profile one week before the maximum. This peculiar pre-maximum spectral evolution is perhaps due to the blending of the Si II6355 at photospheric velocity and another HV absorption component in the outer ejecta, and may be common to normal SNe Ia. The possible origin of these observed HV absorption features is briefly discussed.
Filippenko Alexei V.
Li Wangrong
Wang Xiaofeng
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