The Type Ia Supernova 2001V in NGC 3987

January 2003 • 2003A&A...397..115V

Authors • Vinkó, J. • Bíró, I. B. • Csák, B. • Csizmadia, Sz. • Derekas, A. • Furész, G. • Heiner, Z. • Sárneczky, K. • Sipocz, B. • Szabó, Gy. • Szabó, R. • Sziládi, K. • Szatmáry, K.

Abstract • CCD photometry is presented of the type Ia SN 2001V occurred in the edge-on spiral galaxy NGC 3987. The observations made through Johnson-Cousins BVRI filters were collected from Feb. 24 (t = - 8 days, with respect to B-maximum), up to May 5 (t = +62 days). The light curves are analyzed with the revised Multi-Colour Light Curve Shape (MLCS) method (\cite{riess2}) by fitting template vectors to the observed light curves simultaneously. The reddening of SN 2001V is estimated to be E(B-V)=0.05 mag, while the galactic component is E(B-V) = 0.02 mag (Schlegel et al. \cite{sfd}), suggesting that part of the reddening may be due to the ISM in the host galaxy. The Delta parameter in MLCS converged to -0.47 mag, indicating that this SN was overluminous relative to the majority of Type Ia SNe. The inferred distance to its host galaxy, NGC 3987, is 74.5 +/- 5 Mpc, which is in good agreement with recently determined kinematic distances, based on radial velocity corrected for Virgo-infall and Hubble constant H₀ = 65 km s^-1Mpc^-1. Based on observations obtained at German-Spanish Astronomical Centre, Calar Alto, operated by the Max-Planck-Institute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy.

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