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Spectroscopic Classifications of Eighteen Superluminous Supernovae from the Zwicky Transient Facility

ATel #12918; Lin Yan
on 10 Jul 2019; 18:11 UT
Credential Certification: Lin Yan (lyan@caltech.edu)

Subjects: Optical

Referred to by ATel #: 12921

Lin Yan (Caltech), Daniel Perley (LJMU), R. Lunnan (OKC), S. Schulze (Weizmann), K. Taggart (LJMU), O. Yaron (Weizmann), S. van Velzen (UMD)

We report spectral classifications of 18 low- to intermediate-redshift superluminous supernovae from the Zwicky Transient Facility (Bellm et al. 2018, PASP 131, 995). Candidate SLSNe were selected from the ZTF public and partnership alert feeds using a custom filter developed by D. Perley and implemented on the GROWTH Marshal (Kasliwal et al. 2019, PASP 131, 997). The filter identifies events of interest using a scoring-based metric that notifies us of sources that show a slow rise time, long duration, and/or a high contrast relative to the nearest catalogued galaxy, lack of variability prior to the current observing season, and other metrics. Our program has classified or confirmed 66 SLSNe since the beginning of full ZTF operations in April 2018.

The table below presents the most recent classifications, associated with observations acquired using Low Resolution Imaging Spectrograph (LRIS) on Keck I on UT 2019-07-02 and using the Double Beam SPectrograph (DBSP) on the Palomar 200 inch telescope on UT 2019-07-03. Comparisons to SN spectra from the literature were guided by the use of SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and Superfit (Howell et al. 2005, ApJ, 634, 1190).

ZTF is a project led by PI S. R. Kulkarni at Caltech (see ATEL #11266), and includes IPAC; WIS, Israel; OKC, Sweden; JSI/UMd, USA; UW,USA; DESY, Germany; NRC, Taiwan; UW Milwaukee, USA and LANL USA. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. Alert distribution service provided by DIRAC@UW. Alert filtering is being undertaken by the GROWTH marshal system, supported by NSF PIRE grant 1545949.

 
ZTF Name  | IAUName |  z      | Class.  | M_pk  | m_cur | note 
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19aailsyx | 2019avv |  0.2207 | SLSN-II | -20.8 | >22.2 | 
19aajwogx | 2019cca |  0.4103 | SLSN-I  | -22.5 | >21.2 | [1] 
19aalbrph | 2019kwq |  0.5    | SLSN-I  | -22.2 |  21.1 | 
19aalvdeu | 2019kwr |  0.2022 | SLSN-II | -20.2 | >20.5 | 
19aamhhiz | 2019kws |  0.1977 | SLSN-I  | -20.2 |  21.6 | 
19aaohuwc | 2019dlr |  0.26   | SLSN-I  | -21.0 | >20.1 | 
19aapaeye | 2019cwu |  0.32   | SLSN-I  | -21.3 |  20.7 | 
19aaqrime | 2019kwt |  0.3562 | SLSN-I  | -21.9 |  19.5 | 
19aariuyd | 2019hht |  0.2298 | SLSN-II | -20.5 |  19.7 | [2] 
19aaruixj | 2019kwu |  0.6    | SLSN-I  | -22.4 |  20.2 | [3] 
19aasdvfr | 2019gqi |  0.3642 | SLSN-I  | -21.4 |  20.1 | [4] 
19aaserwb | 2019kwv |  0.3284 | SLSN-II |<-21.3 |  19.6 | 
19aatubsj | 2019fdr |  0.2666 | SLSN-II |<-22.2 |  18.2 | 
19aauiref | 2019fiy |  0.67   | SLSN-I  | -22.9 |  20.0 | [5] 
19aavouyw | 2019gfm |  0.1816 | SLSN-I  | -20.6 |  19.4 | [6] 
19aawsqsc | 2019hno |  0.260  | SLSN-I  | -20.8 |  19.5 | [7] 
19aaynqaj | 2019kww |  0.2723 | SLSN-II | -20.7 |  20.0 | 
19abaeyqw | 2019kcy |  0.40   | SLSN-I  |<-22.0 |  19.3 | 
------------------------------------------------------------------------------------------ 
[1] Previously classified by ePESSTO (Chen et al., ATEL12604).  We present a refined redshift. 
[2] First reported to TNS by ATLAS (ATLAS19mru). 
[3] First reported to TNS by ATLAS (ATLAS19jlx). 
[4] First reported to TNS by ATLAS (ATLAS19mas). 
[5] First reported to TNS by Pan-STARRS (PS19agg). Highlighted as an interesting slow transient by Smartt et al. (AstroNote 2019-33) 
[6] First reported to TNS by Pan-STARRS (PS19ave). Previously classified as a Ic-BL (Chen et al., TNSCR 938). 
[7] First reported to TNS by ATLAS (ATLAS19ndu). 
 
Additional notes on individual spectra are made available via a TNS AstroNote.