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Supernova 1987A revealed that a blue supergiant (BSG) star can end its lifeas a core-collapse supernova (SN). SN 1987A and other similar objects exhibitproperties that distinguish them from ordinary Type II Plateau (IIP) SNe, whoseprogenitors are believed to be red supergiants (RSGs). Similarities among1987A-like events include a long rise to maximum, early luminosity fainter thanthat of normal Type IIP SNe, and radioactivity acting as the primary sourcepowering the light curves. We present and analyze two SNe monitored by theCarnegie Supernova Project that are reminiscent of SN 1987A. Optical andnear-infrared (NIR) light curves, and optical spectroscopy of SNe 2006V and2006au are presented. These observations are compared to those of SN 1987A, andare used to estimate properties of their progenitors. Both objects exhibit aslow rise to maximum and light curve evolution similar to that of SN 1987A. Atthe earliest epochs, SN 2006au also displays an initial dip which we interpretas the signature of the adiabatic cooling phase that ensues shock break- out.SNe 2006V and 2006au are both found to be bluer, hotter and brighter than SN1987A. Spectra of SNe 2006V and 2006au are similar to those of SN 1987A andother normal Type II objects, although both consistently exhibit expansionvelocities higher than SN 1987A. Semi-analytic models are fit to the UVOIRlight curve of each object from which physical properties of the progenitorsare estimated. This yields ejecta mass estimates of about 20 solar masses,explosion energies of 2 - 3 x 10^51 erg, and progenitor radii of 75 - 100 solarradii for both SNe. The progenitors of SNe 2006V and 2006au were most likelyBSGs with a larger explosion energy as compared to that of SN 1987A.

The Type II supernovae 2006V and 2006au: two SN 1987A-like events