J. Vinko, K. Takats, T. Szalai, G. H. Marion, J. C. Wheeler, K. Sarneczky, P. M. Garnavich, J. Kelemen, P. Klagyivik, A. Pal, N. Szalai, K. Vida
The appearance of two recent supernovae, SN 2011dh and 2005cs, both in M51,
provides an opportunity to derive an improved distance to their host galaxy by
combining the observations of both SNe. We apply the Expanding Photosphere
Method to get the distance to M51 by fitting the data of these two SNe
simultaneously. The EPM analysis resulted in D_M51 = 8.4 \pm 0.7 Mpc. Based on
this improved distance, we also re-analyze the HST observations the proposed
progenitor of SN 2011dh. We confirm that the object detected on the
pre-explosion HST-images is unlikely to be a compact stellar cluster, and also
its radius (~ 277$ R_\sun) is too large to be the real (exploded) progenitor of
SN 2011dh.
View original:
http://arxiv.org/abs/1111.0596
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