Supernova 2014eg in ESO 154-G10
Abstract
T. Kangas and S. Mattila, University of Turku; E. Kankare, Queen's University, Belfast (QUB); G. Dimitriadis, M. Smith, and R. Firth, Southampton University; L. Galbany, Departamento de Astronomia, Universidad de Chile, and Millennium Institute of Astrophysics; C. Inserra, QUB; K. Maguire, European Southern Observatory (ESO); S. J. Smartt and K. W. Smith, QUB; M. Sullivan, Southampton University; S. Valenti, Las Cumbres Observatory Global Telescope; O. Yaron, Weizmann Institute for Science; D. Young, QUB; and I. Manulis, Weizmann Institute for Science, on behalf of the Public ESO Spectroscopic Survey for Transient Objects (PESSTO) collaboration, report the discovery of a supernova (magnitudes U = 18.4 +/- 0.1, B = 17.9 +/- 0.1, V = 17.5 +/- 0.1, R = 17.3 +/- 0.1, i = 17.2 +/- 0.1) in the galaxy ESO 154-G10. All observations were performed on the ESO 3.5-m New Technology Telescope (NTT) at La Silla on 2014 Nov. 16.28 UT, using the EFOSC2 UBVRi filters. The position of the transient is R.A. = 2h45m09s.27, Decl. = -55d44'16".9 (equinox 2000.0), which is 5".0 east and 9".0 north of the R-band nucleus of the galaxy (position end figures 08s.68, 25".8). This variable was discovered in the course of observing SN 2013fc (cf. CBET 3644) in ESO 154-G10. The last non-detection was from an NTT/SOFI K_s-band image taken on 2014 Oct. 14.3. T. Kangas, University of Turku; M. Smith, R. Firth, and G. Dimitriadis, Southampton University; L. Galbany, Departamento de Astronomia, Universidad de Chile, and Millennium Institute of Astrophysics; C. Inserra, Queen's University, Belfast (QUB); K. Maguire, European Southern Observatory (ESO); S. J. Smartt and K. W. Smith, QUB; M. Sullivan, Southampton University; S. Valenti, Las Cumbres Observatory Global Telescope; O. Yaron, Weizmann Institute for Science; D. Young, QUB; and I. Manulis, Weizmann Institute for Science, C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, E. S. Walker, and S. Rostami, Yale University; U. Feindt and M. Kowalski, Universitaet Bonn; P. Nugent, Lawrence Berkeley Laboratory; and L. Wyrzykowski, Warsaw Observatory, on behalf of the PESSTO collaboration (see website URL http://www.astronomerstelegram.org/?read=6739), report that an optical spectrogram (range 369-932 nm) of SN 2014eg in the galaxy ESO 154-G10, obtained on 2014 Nov. 23.25 UT with the 3.6-m New Technology Telescope (+ EFOSC2 Grism 13; range 398.5-931.5 nm; 1.8-nm resolution) at La Silla, shows it to be a 1991T-like type-Ia supernova. Adopting a recession velocity of 5586 km/s for ESO 154-G10 (Loveday et al. 1996, Ap.J. Suppl. 107, 201; via NED), the best fit to the spectrum found by SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383) is to the spectrum of SN 1991T at roughly seven days before maximum light. Classification spectra can be obtained at website URL http://www.pessto.org (via WISeREP).
- Publication:
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Central Bureau Electronic Telegrams
- Pub Date:
- January 2015
- Bibcode:
- 2015CBET.4062....1K