| SUPERNOVA
2011N IN ESO 120-16
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier,
F. Forster, S. Silva, F. Carrasco, P. Sanchez, and C.
Hervias, Universidad de Chile; G. Pignata and M. Cifuentes,
Universidad Andres Bello; P. Gonzalez, Pontificia Universidad
Catolica de Chile; B. Conuel, Wesleyan University; G.
Folatelli, Institute for the Physics and Mathematics
of the Universe (IPMU), University of Tokyo; and D.
Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster,
M. Nysewander, and A. LaCluyze, University of North
Carolina at Chapel Hill, on behalf of the CHASE project,
report the discovery of an apparent supernova (mag approximately
17.8 +/- 0.5) on an unfiltered image taken on Jan. 20.18
UT with the 0.41-m 'PROMPT 5' telescope located at Cerro
Tololo. The new object (which was designated PSN J05513518-5902513
on the Central Bureau's TOCP webpage and which is also
present at mag approximately 17.3 in an image taken
on Jan. 21.05) is located at R.A. = 05h51m35s.18 +/-
0".2, Decl. = -59°02'51".3 +/- 0".2 (equinox 2000.0),
which is about 0".6 west and 7".4 south of the center
of the galaxy ESO 120-16. Nothing is visible at this
position on archival images taken on 2010 Dec. 20.27
and 2011 Jan. 12.07 (limiting mag 18.5).
I. Cosimo and F. Bufano, Istituto Nazionale di Astrofisica
(INAF), Osservatorio Astrofisico di Catania; S. Benetti
and S. Valenti, INAF, Osservatorio Astronomico di Padova;
A. Pastorello, Queen's University, Belfast; and G. Pignata,
Universidad Andres Bello, on behalf of a larger collaboration,
report on a spectroscopic observation (range 365-925
nm; resolution 1.8 nm) of 2011N obtained on Jan. 25.05
UT with the EFOSC2 spectrograph mounted on the New Technology
Telescope at the European Southern Observatory. The
spectrum of 2011N is that of a heavily reddened type-Ic
supernova; from a comparison with a library of supernova
spectra performed with the "GELATO" code (Harutyunyan
et al. 2008, A.Ap. 488, 383; available at the following
website URL: https://gelato.tng.iac.es/login.cgi), 2011N
is found to be most similar to SN 2004aw (Taubenberger
et al. 2006, MNRAS 371, 1459) around maximum light.
A reddening of E(B-V) about 0.7 and a redshift of 0.01135,
as derived from the EW and position of the Na I D interstellar
doublet, respectively, have been assumed. |
