Classification of DES16C2nm as a SLSN at z=1.998
ATel #9700; L. Galbany (MAS/U. de Chile/U. Pitt), C. D'Andrea (University of Pennsylvania), S. Prajs, M. Smith, M. Sullivan (University of Southampton), K. Ponder (U. Pitt), S. Gonzalez-Gaitan (MAS/CMM), F. Forster (MAS/CMM), M. Hamuy (U. de Chile/MAS), Jose Luis Prieto (U. Diego Portales/MAS), M. Schubnell (University of Michigan), R. Kessler, J. Lasker, D. Scolnic (University of Chicago), D. J. Brout, L. Gladney, M. March, M. Sako, R. C. Wolf (University of Pennsylvania), P. J. Brown, K. Krisciunas, N. Suntzeff (Texas A&M University), E. Macaulay, R. Nichol (University of Portsmouth), M. Childress (University of Southampton), R. Maartens (University of the Western Cape), E. Kovacs, S. Kuhlmann, H. Spinka (Argonne National Laboratory), E. Ahn, D. A. Finley, J. Frieman, J. Marriner, W. Wester (Fermilab), G. Aldering, R. Gupta, A. G. Kim, R. C. Thomas (Lawrence Berkeley National Laboratory), K. Barbary, J. S. Bloom, D. Goldstein, P. Nugent, S. Perlmutter (Lawrence Berkeley National Laboratory + University of California, Berkeley), R. J. Foley, Y.-C. Pan (University of California, Santa Cruz), R. Casas, F. J. Castander (ICE, IEEC/CSIC, Barcelona), A. Papadopoulos (Cyprus University), E. Morganson (University of Illinois at Urbana-Champaign), S. Desai, K. Paech (Ludwig Maximilians University, Munich), R. C. Smith (NOAO/CTIO)
on 1 Nov 2016; 21:47 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Mathew Smith (matsmith2@gmail.com)
Subjects: Optical, Supernovae, Transient
We report the spectroscopic classification of DES16C2nm as a superluminous supernova (SLSN) discovered by the Dark Energy Survey (ATEL #4668). DES16C2nm was discovered in the first epoch of DES Y4, on 22 August 2016 at R.A. = 03:40:14.83, Decl = -29:05:53.5 with i = 23.2 mag. DES16C2nm has a non-detection in the final epoch of DES Y3 on 08 February 2016. We obtained spectra using LDSS3 on the 6.5m Clay telescope at the Las Campinas Observatory on 10 October 2016 which indicated a redshift of z = 1.998 from Mg II 2800 and FeII 2344/2383 absorption. Further observations were obtained with the X-SHOOTER instrument (wavelength range 380-950nm) on the Very Large Telescope (VLT) of the European Southern Observatory (ESO) on 23 & 24 October 2016, which confirm DES26C2nm to be a SLSN at z = 1.998 near maximum light, spectroscopically similar to iPTF13ajg. Object classification was performed using superfit (Howell et al, 2005, ApJ, 634, 119), the details of which are reported in the table below.
Name | RA (J2000)| Dec (J2000)|Discovery |Discovery|Spectrum |Redshift| Type | Phase |Notes
| | |Date (UT) |Mag (i) |Date (UT) | | | |
DES16C2nm |03:40:14.83|-29:05:53.5 |2016 Aug 22| 23.2 |2016 Oct 10 (Magellan), 2016 Oct 23/24 (VLT)| 1.998 |SLSN-I |near-max| a
a). Redshift from galaxy absorption features