2009CBET.1877....1T

M. Turatto, Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Catania (OAC); F. Bufano, INAF, Osservatorio Astronomico di Padova (OAP); I. Agnoletto, Universita' degli Studi di Padova; C. Inserra, INAF, OAC; A. Pastorello, Queen's University, Belfast; and S. Benetti, INAF, OAP, report that spectra and images of SNe 2009ha (cf. CBET 1865), 2009hf (cf. CBET 1869), 2009hh (cf. CBET 1871), 2009hi (cf. CBET 1872), 2009hj (cf. CBET 1873), and 2009hk (cf. CBET 1875) have been obtained with the New Technology Telescope (+ EFOSC2; range 345-930 nm, resolution 2.2 nm). Cross-correlation of the observed spectra with a library of supernova spectra has been performed with the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383, available at https://gelato.tng.iac.es/login.cgi).

A spectrum of SN 2009ha (acquired on July 16.42 UT) shows it to be a type-Ib/c supernova a few days past maximum. The spectrum shows some similarities with the type-Ib SN 1999dn (Turatto et al., in preparation) at about two weeks after maximum light. The estimated apparent R magnitude is about 16.1.

SN 2009hf (July 16.24) is similar to the type-IIP supernova 2005ay (Bufano et al. 2007, AIPC 924, 271) at about 10 days after explosion. The spectrum is characterized by a blue continuum with broad P-Cyg features of the hydrogen Balmer series (the expansion velocity from H_beta is about 9200 km/s, after correcting for the parent-galaxy recession velocity of 3910 km/s; Jayaram et al. 1993, Ap.J. 419, 30, via NED). The He I 587.6-nm P-Cyg line is also present. The apparent R magnitude is about 16.3.

The spectrum of 2009hh, obtained on July 16.34, shows evident similarities with the type-Ic supernova 2007gr at around maximum light (Valenti et al. 2008, Ap.J. 673, 155). The estimated apparent R magnitude is about 13.8.

A spectrum of 2009hi (acquired on July 16.47) shows it to be a type-Ia supernova similar to SN 1992A (Asiago-Padova Supernova Archive, ASA) at 4 days after maximum. An expansion velocity of 11700 km/s is measured from the minimum of the Si II 635.5-nm absorption line, after correcting for the host-galaxy recession velocity of 12327 km/s (Wegner et al. 1999, MNRAS 305, 259, via NED). The apparent R magnitude is about 16.3 .

A noisy spectrum of 2009hj (July 16.22) shows it to be a type-II supernova similar to SN 1995V (ASA) at about one month after discovery. The apparent R magnitude is about 14.8.

A spectrum of 2009hk , acquired on July 16.14, shows it to be a type-Ia supernova, similar to SN 2005cf at 38 days past maximum (Pastorello et al. 2007, MNRAS 376, 1301; Garavini et al. 2007, A.Ap. 471, 527). A likely recession velocity for the host galaxy of 5500 ± 500 km/s was deduced from the positions of the main spectral features. The expansion velocity, measured from the minimum of the Si II absorption line, is about 8000 km/s. The estimated apparent R magnitude is about 16.9.