AstroNote 2019-59

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DRAFT
2019-08-01 14:06:41
Type: Object/s-Discovery/Classification
C-SNAILS spectra of optical transients
Authors: Matt Nicholl, Phil Short, Andy Lawrence, Nic Ross (Edinburgh), Stephen Smartt (QUB)
Source Group: C-SNAILS
Abstract:
We announce the first observations from C-SNAILS: the Classification Survey for NucleAr transients with Liverpool and LaSair. C-SNAILS targets are selected automatically from the Zwicky Transient Facility public alerts stream using the Lasair broker. Classification spectra are obtained using the Liverpool Telescope and SPRAT. Our initial observations include 1 AGN, 1 SN Ia, and 1 likely SLSN IIn. Additionally, we have identified 4 nuclear transients showing relatively featureless blue continua, at z~0.07-0.15. Follow-up of these sources is encouraged.

We announce the first observations from C-SNAILS: the Classification Survey for NucleAr transients with Liverpool and LaSair.

Targets are selected automatically from the Zwicky Transient Facility public alerts stream (Kulkarni 2018) using the Lasair broker (Smith, Williams, Young et al. 2019) and observed spectroscopically using SPRAT (Piascik et al. 2014) on the Liverpool Telescope (Steele et al. 2004). Classifications were done using DASH (Muthukrishna et al. 2019), SNID (Blondin & Tonry 2007) and GELATO (Harutyunyan et al. 2008)

Our initial observations include 1 AGN, 1 SN Ia, and 1 likely SLSN IIn. Additionally, we have identified 4 nuclear transients showing relatively featureless blue continua, at z~0.07-0.15. Follow-up of these sources is encouraged.

AT2019meg is particularly interesting as it has an absolute peak magnitude of -20.1 mag, and exhibits a possible bump or plateau in the early ZTF light curve.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2019meh [ZTF19abclykm]21:27:17.452+64:24:59.17SLSN-II0.093Narrow/intermediate width Balmer and He I emission. Correcting for Galactic extinction Av~2mag gives a blue continuum and a peak luminosity ~ -22.5 mag21:27:17.452+64:24:59.17SLSN-II0.092
TNS2019mei [ZTF19abcudso]19:57:19.998+09:31:32.35AGN0.212Featureless blue continuum, redshift from narrow host emission lines. Absolute magnitude at this redshift is -20.1, making this a potential SLSN. Light curve shows a possible bump/plateau prior to main rise.19:57:19.998+09:31:32.35AGN0.212
TNS2019lky [ZTF19abgjlef]00:29:47.679+17:33:26.90SN Ia0.05800:29:47.679+17:33:26.90SN Ia0.058
TNS2019lby [ZTF19abfpvle]21:14:04.522-11:35:26.83SN I0.1Redshift from template matching. DASH prefers an SN Ib classification, but good matches are also found with SNe Ia. Spectrum includes substantial host contribution.21:14:04.522-11:35:26.83
TNS2019lse [ZTF19abhisnk]01:54:50.725+41:05:48.32Other0.079Blue continuum, host emission lines01:54:50.725+41:05:48.32
TNS2019mal [ZTF19abidfsb]23:09:06.584-17:40:27.34Other0.076Blue continuum, host emission lines23:09:06.583-17:40:27.27SN Ia0.083
TNS2019meg [ZTF19abhhjcc]18:45:16.178+44:26:19.14Other0.152Blue continuum, host emission lines. At this redshift the transient has an absolute mag ~ -20.1. Early light curve may exhibit a bump/plateau.18:45:16.180+44:26:19.21
TNS2019lwu [ZTF19abidbya]23:11:12.315-01:00:10.80OtherBlue continuum, agrees with ePESSTO+ observations (AstroNote #2019-58)23:11:12.305-01:00:10.71