AstroNote 2021-6

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2021-01-05 19:20:10
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Gillanders, S. Srivastav, M. Fulton, L. J. Shingles, K. W. Smith (QUB), S. Prentice (TCD), C. Gutierrez (Turku), S. Benetti (INAF), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), E. Zimmerman, O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), J. Tonry,  L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii),  B. Stalder (LSST), A. Rest (STScI), S. J. Smartt, O. McBrien (QUB)
Source Group: ePESSTO+
This report includes classifications of 9 Type Ia's and 4 Type II's. SN2020acsk is a peculiar Type II supernova, showing features resembling that of SN-IIb close to peak, as well as SN1987A. We encourage follow-up 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 ATLAS survey (Smith et al. 2020 2020arXiv200309052S), the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014 2014ApJ...788...48S) and from the Catalina Real-time Transient Survey (CRTS; Drake et al. 2009, ApJ, 696, 870;

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2021 January 04, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) and GELATO (Harutyunyan et al. 2008 2008A&A...488..383H) and Superfit (Howell et al. 2005 2005ApJ...634.1190H).

The classification spectra and additional details can be obtained from (via WISeREP) and the IAU Transient Name Server.

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

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftSourcePhase (days)RemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020acpg [ATLAS20bhzr]03:01:03.340-37:02:13.67SN Ia0.07GALEXASC J030103.43-370212.0ATLAS+11 to +20Redshift acquired from SNID.03:01:03.340-37:02:13.67SN Ia0.07
TNS2020acph [ATLAS20bhzs]11:01:40.753+22:05:37.95SN Ia0.12SDSS J110140.60+220536.8ATLAS+11 to +20Noisy spectrum, however, the Si II line (6150) has a profile and strength similar to an SNIa. Redshift acquired from SNID.11:01:40.755+22:05:37.97SN Ia0.12
TNS2020acpi [ATLAS20bhzu]11:35:46.559-49:02:12.43SN II0.017ESO 216- G 0210.016958ATLAS> +2011:35:46.559-49:02:12.43SN II0.017
TNS2020acsk [ATLAS20bikf]09:42:51.546+28:59:57.03SN IIb0.029UGC 05185 NOTES010.029012ATLAS–3 to +3Spectrum matches well with SN-IIb at around peak, with some features resembling that of SN1987A.09:42:51.546+28:59:57.03SN IIb0.029
TNS2020adhh04:43:46.180+28:58:10.53SN II0.022UGC 31420.02166CRTS–3 to +3Noisy spectrum. Obtained fits with SNII and H-alpha from host at redshift z = 0.022.04:43:46.180+28:58:10.53SN II0.022
TNS2020adlh [ASASSN-20qh]13:38:26.170-31:15:52.09SN Ia0.036ESO 444-IG 089 NED020.038013ASAS-SN+11 to +2013:38:26.170-31:15:52.09SN Ia0.036
TNS2020adnu [ASASSSN-20qi]11:38:08.450-32:51:05.98SN Ia0.031WISEA J113808.29-325108.40.030625ASAS-SN–3 to +311:38:08.450-32:51:05.98SN Ia0.031
TNS2020adnw [ATLAS20bjhw]13:15:06.311-37:08:21.90SN Ia0.036ESO 382- G 0230.036418ATLAS–3 to +313:15:06.311-37:08:21.90SN Ia0.036
TNS2020adrp [ATLAS20bjmg]03:10:57.350-40:43:07.19SN Ia0.06ATLAS–3 to +3Redshift acquired from SNID.03:10:57.350-40:43:07.19SN Ia0.06
TNS2020aeph [ATLAS20bjqg]12:33:08.483-38:52:40.34SN IIP0.03ATLAS> +20ATLAS lightcurve has been flat over 30 days, suggesting this may be an SN-IIP. Redshift acquired from SNID.12:33:08.483-38:52:40.34SN IIP0.03
TNS2020aeqv [ATLAS20bjvf]10:52:27.186-32:19:17.57SN Ia0.062MASX J10522638-3219088ATLAS–3 to +3Redshift acquired from SNID.10:52:27.186-32:19:17.57SN Ia0.06
TNS2020aerm [ATLAS20bjxg]11:04:13.775-33:58:51.35SN Ia0.09ATLAS–3 to +3Redshift acquired from SNID.11:04:13.775-33:58:51.35SN Ia0.09
TNS2020adpg [ATLAS20bjig]22:31:12.088-15:01:32.08SN Ia0.03WISEA J223111.61-150138.3ATLAS–3 to +3Redshift acquired from SNID.22:31:12.088-15:01:32.08SN Ia0.03