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PESSTO spectroscopic classification of optical transients

ATel #6403; L. Tartaglia, N. Elias-Rosa (INAF-Padova), A. Morales-Garoffolo (ICE-CSIC/IEEC), L. Tomasella, S. Benetti, A. Pastorello (INAF-Padova), M. T. Botticella (INAF-OAC), C. Inserra (QUB), K. Maguire (ESO), S. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton University), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, S. Rostami, E. S. Walker (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley), L. Wyrzykowski (Warsaw Observatory, Poland)
on 19 Aug 2014; 17:46 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Valenti et al., ATel #4037; http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by the La Silla-Quest survey (see Baltay et al., PASP, 2013, 125, 683) and the IAU Transient Objects Confirmation Page list. All observations were performed on the ESO New Technology Telescope at La Silla in the night starting on 2014 Aug 18 UT, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). Classification spectra can be obtained from http://www.pessto.org (via WISeREP).

 
 Name                         | RA (J2000)  | Dec (J2000) | Disc. Date  | Disc. Source       | Disc Mag  |  z   | Type  | Phase | Notes
PSN J14504990-1331037 | 14:50:49.90 | -13:31:03.7 | 20140818 | TOCP | 16.4 | 0.03 | Ia | max | LSQ14efs | 21:00:18.82 | -35:23:56.1 | 20140720 | LSQ | 19.9 | 0.09 | II | +20d | (1) LSQ14efq | 20:47:50.29 | -47:33:11.0 | 20140801 | LSQ | 18.9 | -- | CV | -- | (2) LSQ14dsx | 23:04:09.83 | -52:11:44.0 | 20140801 | LSQ | 19.3 | 0.10 | Ia | +10d | LSQ14dxl | 01:34:15.10 | -17:05:59.8 | 20140725 | LSQ | 19.8 | 0.06 | IIP | 3w | (3) LSQ14efd | 03:35:38.76 | -58:52:38.3 | 20140803 | LSQ | 20.0 | 0.08 | I | max | (4)

(1) The spectrum shows narrow unresolved Balmer emissions at z=0.093. [SII] 6717, 6731 Ang and [NII] 6549, 6583 Ang lines are also detected. Narrow lines are possibly associated with an underlying H II region.

(2) This is the spectrum of a CV, which reveals weak Halpha emission (at rest wavelength) onto a strong blue continuum. Hbeta and Hgamma loom as absorption with emission core. This spectrum may be linked to a dwarf nova near the end of an outburst (Szkody at al. 1990, ApJS, 73, 441). NaID absorption and (weak) HeI 4471 Ang absorptions are also visible.

(3) The photometry from LSQ allows us to classify it as a Type-IIP.

(4) Spectrum at higher S/N than the previous one (taken on Aug. 17 UT) which allows a refinement of the classification reported in Atel #6400. The new observation shows that the best match of this transient is with Type-Ic SN 2003jd around B-band maximum light; Adopting a redshift z~0.08 and using LSQ photometry, an absolute mag of M_r ~ -17.7 is obtained which is consistent with this classification especially if some extinction is considered.

PESSTO, the Public ESO Spectroscopic Survey for Transient Objects