Supernova 2014cb in Pgc 53008 = Psn J14504990-1331037
Abstract
S. Parker, Canterbury, New Zealand, reports the discovery of an apparent supernova (red mag 16.4) on a 30-s unfiltered CCD image (limiting mag 18.5) taken by himself on Aug. 18.306 UT with a 30-cm Astro-Tech AT12RC Ritchey- Chretien astrograph (+ ST10 camera) at his Parkdale Observatory in the course of the Backyard Observatory Supernova Search. The new object is located at R.A. = 14h50m49s.90, Decl. = -13d31'03".7 (equinox 2000.0; reference stars from USNO-B and UCAC4 catalogues), which is 25" east and 27" north of the nucleus of the galaxy MCG -2-38-18 = PGC 53008. Nothing is visible at this position on Digitized Sky Survey red and infrared images (limiting red mag > 19). An image of the variable is available via http://tinyurl.com/kwkejhg. The variable was designated PSN J14504990-1331037 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014cb based on the spectroscopic confirmation reported below. L. Tartaglia and N. Elias-Rosa, Osservatorio Astronomico di Padova, INAF; A. Morales-Garoffolo, Institut de Ciencies de l'Espai, IEEC, Consejo Superior de Investigaciones Cientificas, Barcelona; L. Tomasella, S. Benetti, and A. Pastorello, Osservatorio Astronomico di Padova, INAF; M. T. Botticella, Osservatorio Astronomico di Capodimonte, INAF; C. Inserra, Queen's University, Belfast; K. Maguire, European Southern Observatory; S. Smartt and K. W. Smith, Queen's University, Belfast; M. Sullivan, Southampton University; S. Valenti, Las Cumbres Observatory Global Telescope; O. Yaron, Weizmann Institute for Science; D. Young, Queen's University, Belfast; I. Manulis, Weizmann Institute for Science; C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, S. Rostami, and E. S. Walker, Yale University; U. Feindt and M. Kowalski, Universitaet Bonn; P. Nugent, Lawrence Berkeley Laboratory; and L. Wyrzykowski, Warsaw Observatory, report that an optical spectrogram of PSN J14504990-1331037 = SN 2014cb was obtained on Aug. 18 UT with the European Southern Observatory's New Technology Telescope at La Silla using EFOSC2 and Grism 13 (range 398.5-931.5 nm; 1.8-nm resolution) under PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Valenti et al., website URL http://www.pessto.org). Adopting for the host galaxy (PGC 53008) a radial velocity of 10011 km/s (Jones at al. 2009, The 6dF Galaxy Survey Data Release 3; via NED), a good match is found with several type-Ia supernovae at B-band maximum light. An expansion velocity of about 9800 km/s is derived from the minimum of the Si II 635-nm line. Classifications was done with SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) and GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383). Classification spectra can be obtained at website URL http://www.pessto.org (via WISeREP). S. T. Hodgkin, M. Fraser, H. Campbell, and G. T. Rixon, University of Cambridge; L. Wyrzykowski, Warsaw Observatory; and A. Pastorello, N. Elias-Rosa, and L. Tartaglia, Osservatorio Astronomico di Padova, INAF, report the spectroscopic classification of PSN J14504990-1331037 = SN 2014cb using the EFOSC2 spectrograph (+ Grism 13; range 398.5-931.5 nm; 1.8-nm resolution) on the 3.6-m New Technology Telescope at La Silla on Aug. 19.99 UT. The spectrum was compared against a set of templates using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) and is consistent with a normal type-Ia supernova around maximum light, at a redshift of 0.033.
- Publication:
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Central Bureau Electronic Telegrams
- Pub Date:
- August 2014
- Bibcode:
- 2014CBET.3939....1P