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SN 2014bb in NGC 5214 - 2014 05 09

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SN 2014bb (A.R., 13 32 49.11 Dec. +41 52 15.1), scoperta il 9 maggio 2014 nella galassia ngc 5214 (offset 4E 4S), magnitudine 16.5, tipo: Ia (ATEL 6140)

SN individuata da F. Ciabattari, E. Mazzoni and M. Rossi con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).

>                                                 Electronic Telegram No.
> 3875
> Central Bureau for Astronomical Telegrams
> INTERNATIONAL ASTRONOMICAL UNION
> CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
> 20 Oxford St.; Cambridge, MA  02138; U.S.A.
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> URL http://www.cbat.eps.harvard.edu/index.html
> Prepared using the Tamkin Foundation Computer Network
>
>
> SUPERNOVA 2014bb IN NGC 5214 = PSN J13324911+4152151
>     F. Ciabattari, E. Mazzoni, and M. Rossi, Borgo a Mozzano, Italy, report
> the discovery of an apparent supernova (mag 16.5) on unfiltered CCD images
> (limiting magnitude 19.5) obtained on May 9.06 and 9.83 UT with a 0.5-m
> Newtonian telescope (+ FLI 4710 Proline camera).  The new object is located
> at
> R.A. = 13h32m49s.11, Decl. = +41d52'15".1 (equinox 2000.0; astrometry with
> respect to UCAC-2 stars), which is 4" east and 4" south of the center
of the
> galaxy NGC 5214.  Nothing is visible at this position on digitized Palomar
> Sky
> Survey plates from 1996 Mar. 21 (J plate; limiting magnitude 20.3) and 1997
> Apr. 11 (F plate; limiting magnitude 20.3).  The variable was designated PSN
> J13324911+4152151 when it was posted at the Central Bureau's TOCP webpage
> and
> is here designated SN 2014bb based on the spectroscopic confirmation
> reported
> below.  Additional CCD magnitudes for 2014bb:  2014 Apr. 18, [19.5
> (Ciabattari
> et al.); 24.004, [19.3 (Simone Leonini, P. Rosi, M. Conti, L. M. Tinjaca
> Ramirez, and G. Guerrini, Siena, Italy; 0.53-m reflector); May 4.992, 17.5
> (Leonini et al.; pre-discovery image obtained in the course of the Italian
> Supernovae Search Project; limiting mag about 19.3; position end figures
> 49s.08, 14".6; image visible via website URL http://tinyurl.com/ov948d9);
> 9.864, 16.3 (Gianluca Masi; remotely using a 43-cm telescope near Ceccano,
> Italy; position end figures 49s.05, 15".3); 10.297, 16.9 (Joseph
Brimacombe,
> Cairns, Australia; remotely using a 43-cm CDK telescope + STL-6303 camera at
> the New Mexico Skies observatory near Mayhill, NM, U.S.A.; position end
> figures 49s.09, 15".2; image visible via URL http://tinyurl.com/qfp57g4).
>
>     P. Ochner, L. Tomasella, S. Benetti, A. Pastorello, N. Elias-Rosa, E.
> Cappellaro, and M. Turatto, Osservatorio Astronomico di Padova, Istituto
> Nazionale di Astrofisica, report that an optical spectrogram (range 335-785
> nm; resolution 0.9 nm), obtained on May 14.84 UT with the Asiago 1.22-m
> Galileo Telescope (+ Boller & Chivens spectrograph), shows that PSN
> J13324911+4152151 = SN 2014bb is a type-Ia supernova.  Assuming a
> recessional
> velocity of 8077 km/s for the host galaxy, NGC 5214 (Woods 2006, A.J. 132,
> 197; via NED), a best match is found with the peculiar type-Ia supernova
> 1998es at about one week before maximum light, both supernovae showing at
> this
> phase a shallow Si II 635-nm absorption.  The prominent Na I D interstellar
> doublet suggests the presence of significant extinction in the host galaxy,
> with E(B-V) around 0.4 mag.  An expansion velocity of about 10500 km/s is
> derived from the minimum of the Si II 635-nm line.  The Asiago
> classification
> spectra are posted at website URL http://sngroup.oapd.inaf.it.
> Classification
> was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID
> (Blondin and Tonry 2007, Ap.J. 666, 1024).
>
>
> NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
>      superseded by text appearing later in the printed IAU Circulars.
>
>                         (C) Copyright 2014 CBAT
> 2014 May 22                      (CBET 3875)              Daniel W. E. Green