| SUPERNOVA
2010ls
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier,
F. Forster, S. Silva, and F. Carrasco, Universidad de
Chile; G. Pignata and M. Cifuentes, Universidad Andres
Bello; P. Gonzalez, Pontificia Universidad Catolica
de Chile; B. Conuel, Wesleyan University; G. Folatelli,
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 16.2) on
an unfiltered image taken on 2010 Dec. 29.30 UT with
the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo.
The new object, which is also present at mag approximately
16.1 in an image taken on 2010 Dec. 30.28, is located
at R.A. = 13h40m51s.56 +/- 0".2, Decl. = -48°23'03".1
+/- 0".2 (equinox 2000.0). Nothing is visible at this
position on archival images taken on 2010 May 12.29
and July 3.18 (limiting mag 18.0).
M. Miluzio, S. Benetti, and F. Bufano, Istituto Nazionale
di Astrofisica, Osservatorio Astronomico di Padova;
A. Pastorello, Queen's University, Belfast; and G. Pignata,
Universidad Andres Bello, on behalf of a larger collaboration,
report on spectroscopic observations (range 340-800
nm) of 2010ls obtained on 2010 Dec. 31.32 UT with the
EFOSC2 spectrograph mounted on the New Technology Telescope
at the European Southern Observatory. The spectrum of
2010ls is that an evolved type-IIb 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 https://gelato.tng.iac.es/login.cgi),
2010ls is found to be most similar to SN 1993J at about
two months after maximum light. |
