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SOAR spectroscopic classification of optical transients

ATel #11894; R. Cartier, J. Espinoza (CTIO), C. Contreras (STScI), A. Boltom (NOAO), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), O. Yaron (Weizmann), D. R. Young (QUB), J. Tonry, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), K. W. Smith, O. McBrien (QUB), D. E. Wright (Univ. of Minnesota)
on 27 Jul 2018; 23:47 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Regis Cartier (rgcartier@gmail.com)

Subjects: Optical, Supernovae

We report the following supernova classifications. The targets were supplied by supplied by the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680), the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014, ApJ, 788, 48 and http://www.astronomy.ohio-state.edu/~assassin/index.shtml ), the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts) and by the Backyard Observatory Supernova Search (BOSS; http://bosssupernova.com/ ). The observations were performed on the night of 2018-07-25 at the 4.1m SOAR Telescope equipped with the Goodman High Throughput Spectrograph using the 400 lines/mm grating, and a slit width of 1.0 arc second, resulting in a spectral coverage from 380-775 nm with a resolution of 0.636 nm.

 
Survey Name | IAU Name  | RA (J2000)  | Dec (J2000) | Disc. Date | Source  | Disc Mag |  z    | Type | Phase      | Notes 
            | SN2018ecf | 14:06:34.39 | -34:18:03.7 | 2018-07-23 | BOSS    | 16.50    | 0.012 | II   | young      | (1,4) 
ASASSN-18pi | SN2018dyv | 19:43:17.32 | -54:34:14.4 | 2018-07-14 | ASAS-SN | 18.20    | 0.041 | IIn  | young      | (2,5) 
ASASSN-18pl | SN2018dzt | 21:27:52.80 | -51:19:55.7 | 2018-07-17 | ASAS-SN | 17.40    | 0.053 | Ia   | at max     | (3) 
ASASSN-18pu | SN2018ebu | 21:57:19.87 | -45:34:39.2 | 2018-07-22 | ASAS-SN | 18.00    | 0.061 | Ia   | -7 to -4   | (2) 
ATLAS18smc  | SN2018ecg | 00:00:20.89 | -36:28:48.0 | 2018-07-10 | ATLAS   | 19.23    | 0.104 | Ic   | at max     | (1,6) 
Gaia18bwa   | SN2018edn | 00:43:35.29 | -70:33:01.0 | 2018-07-22 | GAIA    | 18.45    | 0.066 | Ia   | at max     | (1,6) 
ASASSN-18px | SN2018ebx | 00:55:26.41 | -74:18:42.1 | 2018-07-21 | ASAS-SN | 16.50    | 0.034 | Ia   | past max   | (2,7) 
ATLAS18sll  | SN2018ecb | 02:09:28.49 | -35:54:52.9 | 2018-07-22 | ATLAS   | 19.17    | 0.061 | II   | young      | (3,8) 
Gaia18boc   | SN2018cqg | 03:21:13.77 | -57:13:31.2 | 2018-06-16 | GAIA    | 17.39    | 0.020 | Ibc  | +11 to +19 | (3) 
 
(1) Redshift estimate obtained from best template fit. 
(2) Redshift measured from narrow emission lines. 
(3) Redshift obtained from NED. 
(4) Similar to SN2005cs at an early phase. 
(5) It shows narrow Balmer lines and blue continuum. 
(6) Orphan transient. 
(7) Best fit templates are of SNe Ia at z~0.027 at one week past maximum, however we measured a redshift of 0.034, 
from the host galaxy narrow emission lines. ASAS-SN reported V = 16.50 mag on 2018-07-21 and g=17.3 mag on 2018-07-22, 
suggesting an intrinsic red colour or a fast decline in the SN brightness.  The classification spectrum does not look 
peculiarly red, suggesting a fast photometric evolution rather than red colours. We encourage photometric follow-up.  
(8) The best template fit is SN1993J (IIb) at -17.