Tycho Brahe's supernova: light from centuries past

Abstract

The light curve of SN 1572 is described in the terms used nowadays to characterize SNeIa. By assembling the records of the observations done in 1572--74 and evaluating their uncertainties, it is possible to recover the light curve and the color evolution of this supernova. It is found that, within the SNe Ia family, the event should have been a SNIa with a normal rate of decline, its stretch factor being {\it s} $\sim$ 0.9. Visual light curve near maximum, late--time decline and the color evolution sustain this conclusion. After correcting for extinction, the luminosity of this supernova is found to be M${}_V$ $=$ --19.58 --5 log (D/3.5 kpc) $\pm$ 0.42.

28 pages, 3 figures, 3 tables. submitted to ApJ (Main Journal)

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