Subjects: Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of PSN J13443367+0446535 in UGC 8690. Information on this transient, discovered by F. Ciabattari, E. Mazzoni and S. Donati (Italian Supernovae Search Project) was announced through CBAT Transient Object Followup Reports (http://www.cbat.eps.harvard.edu/index.html) and is also available from the "Bright Supernova" website (http://www.rochesterastronomy.org/snimages/). The observation was performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.3 nm).

 
 
Name                  | Date (UT)       |        v        |   Type      | Phase   | Notes 
PSN J13443367+0446535 | 20150411.90     | 6938 km/s       |    II       | 1 month | (1)    
 

(1) The expansion velocity of the ejected material, as inferred from the position of the absorption of the Halpha, is about 7800 km/s.

Classification was done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024). The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.

Padova Asiago SN group

Electronic Telegram No. 4129

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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Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2015R IN UGC 8690 = PSN J13443367+0446535
F. Ciabattari, E. Mazzoni, and S. Donati, Borgo a Mozzano, Italy, report
that an apparent supernova (mag 17.8) was discovered on unfiltered CCD images
(limiting magnitude 19.5) obtained on Apr. 9.89 and 10.81 UT with a 0.5-m
Newtonian telescope (+ FLI 4710 Proline camera).  The new object is located at
R.A. = 13h44m33s.67, Decl. = +4d46'53".5 (equinox 2000.0; astrometry with
respect to UCAC-2 stars) which is 5" west and 22" north of the center of the
galaxy UGC 8690.  Nothing is visible at this position on digitized plates of
the Palomar Sky Survey from 1993 May 12 (F plate; limiting magnitude 20.3)
and 1996 Mar. 24 (J plate; limiting magnitude 20.3).  The variable was
designated PSN J13443367+0446535 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2015R based on the spectroscopic
confirmation reported below.  The type-Ia supernova 2005G (cf. IAUC 8465)
also appeared in UGC 8690.  Additional CCD magnitudes for 2015R:  2015 Mar.
21, [19.5 (Ciabattari et al.); Apr. 9.007, 18: (Fabio Briganti, Cortina
d'Ampezzo, Italy; pre-discovery image found on an image obtained with a 0.28-m
C11 telescope + SBIG-ST8 camera in the course of the Italian Supernovae Search
Project; variable barely visible near the limit); Apr. 11.974, 18.1 (R.
Furgoni and A. Righelli, San Benedetto Po, Italy; 0.4-m f/5.5 reflector +
FLI-ML1603 camera; position end figures 33s.70, 52".4; UCAC4 reference stars;
image posted via website URL http://tinyurl.com/nnxoysu); Apr. 12.060, 18.6
(M. Caimmi, Loreto, Italy; 0.24-m f/6.5 reflector + Atik 314L camera; position
end figures 33s.69, 52".4; image posted via URL http://tinyurl.com/oc48ptr);
Apr. 12.850, 17.9 (G. Masi and P. Catalano; remotely using a 43-cm telescope
at Ceccano, Italy; position end figures 33s.70, 52".9).

S. Benetti, L. Tomasella, E. Cappellaro, N. Elias-Rosa, P. Ochner, A.
Pastorello, L. Tartaglia, G. Terreran, and M. Turatto, Osservatorio
Astronomico di Padova, INAF, report that an optical spectrogram (range 340-820
nm; resolution 1.3 nm) of SN 2015R, obtained on Apr. 11.90 UT with the
Asiago 182-cm Copernico Telescope (+ AFOSC) in the framework of the Asiago
Transient Classification Program (Tomasella et al. 2014, A.N. 335, 841),
shows that this object is a type-II supernova.  Adopting for the host galaxy
a recessional velocity of 6938 km/s (Falco et al. 1999 PASP 111, 438; via
NED), the expansion velocity of the ejected material, as inferred from the
position of the absorption of the H_alpha, is about 7800 km/s.
Classification was done with GELATO (Harutyunyan et al. 2008, A.Ap. 488,
383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).  The Asiago
classification spectra are posted at URL http://sngroup.oapd.inaf.it.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2015 CBAT
2015 August 2                    (CBET 4129)              Daniel W. E. Green