DRAFT
2020-11-21 16:38:39
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: M. Gromadzki, N. Ihanec (Warsaw), E. Callis, M. Fraser (UCD), R. Carini (INAF), G. Pignata (UNAB), P. Wiseman (Southampton), I. Arcavi (Tel Aviv University), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (Stockholm), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), S. J. Smartt, K. W. Smith, S. Srivastav (QUB), K. C. Chambers, T. de Boer, J. Bulger, J. Fairlamb, M. Huber, C.-C. Lin, T. Lowe, E. Magnier, A. Schultz, R. J. Wainscoat, M. Willman (IfA, Univ. Hawaii), J. Tonry, L. Denneau, A. Heinze, H. Weiland, H. Flewelling (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), O. McBrien (QUB)
Source Group: ePESSTO+
Abstract:
This report includes classifications of 6 Type Ia's, 1 Type II, and 1 ambiguous object. SN2020zoq is a young Type II, with a blue continuum and clear P-Cygni Balmer series and NaD/HeI. AT2020znl has a narrow emission feature (at the edge of the telluric B-band) which we tentatively associate with Halpha. The continuum is blue and largely featureless aside from two apparent absorptions at "rest frame" 4757, 4833 Ang, and was initially classified as a possible TDE in ATel #14190. We encourage followup observations.

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classifications.

Targets were supplied by the Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C), the ATLAS survey (Smith et al. 2020 2020arXiv200309052S), the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the Lasair broker (Smith, Williams, Young et al. 2019 2019RNAAS...3a..26S), and the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014 2014ApJ...788...48S).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2020 Nov 20, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B).

The classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

The classified objects are listed in the Related Objects table below.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2020zpj [ZTF20acqjmzk] 22:43:38.633 -14:04:04.47 SN Ia 0.1 WISEA J224338.65-140405.1 at max Redshift from SNID match. 22:43:38.633 -14:04:04.47 SN Ia 0.1
TNS 2020zid [ZTF20acppruo] 23:22:06.059 -06:12:47.21 SN Ia 0.13 SDSS J232206.10-061247.5 0.118 at max Redshift from SNID match. 23:22:06.059 -06:12:47.21 SN Ia 0.13
TNS 2020aabz [ZTF20acqzjqz] 02:54:59.029 +04:03:36.86 SN Ia 0.03 -7 to -4 Redshift from SNID match. 02:54:59.040 +04:03:37.01 SN Ia 0.0241
TNS 2020aakp [ASASSN-20ol] 06:43:06.166 -74:12:48.89 SN Ia 0.028 PGC19480 0.023 -7 to -4 Redshift from SNID match. 06:43:06.150 -74:12:49.46 SN Ia 0.028
TNS 2020zqo [ASASSN-20od] 04:02:55.154 -31:20:16.62 SN Ia 0.06 WISEA J040255.26-312018.9 0.059658 at max Redshift from SNID match. 04:02:55.180 -31:20:16.62 SN Ia 0.06
TNS 2020aagw [ATLAS20bfpg] 08:38:58.367 +05:47:27.60 SN Ia 0.05 at max Redshift from SNID match. 08:38:58.365 +05:47:27.64 SN Ia 0.048
TNS 2020zoq [ASASSN-20oc] 10:36:21.542 +13:43:08.94 SN II 0.01 UGC 05760 0.01004 +1 to +2 weeks Redshift measured from emission lines. Blue continuum, clear P-Cygni Balmer series and NaD/HeI. Abs mag = -15.4, consistent with a nornal Type IIP. 10:36:21.590 +13:43:07.10 SN II 0.01
TNS 2020znl [ZTF20acpvbbh] 06:13:17.896 -15:53:31.41 Other 0.043 around max Redshift measured from emission lines. Narrow emission feature (unfortunately at the edge of the telluric B-band) which we tentatively associated with Halpha. The continuum is blue and largely featureless aside from two apparent absorptions at *rest frame* 4757, 4833 Ang. Fitting a Gaussian to these absorptions gives an FWHM of 2,000 - 4,000 km/s. The lightcurve has a clear and smooth rise for ~10 days, and at z=0.043 has an absolute magnitude -19.3. Was initially classified as a possible TDE in ATel #14190. 06:13:17.899 -15:53:31.45 SN II 0.043

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