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ePESSTO spectroscopic classification of optical transients

ATel #10961; G. Cannizzaro (SRON/RU), F. Onori (SRON/RU), Z. Kostrzewa-Rutkowska (SRON/RU), P. G. Jonker (SRON/RU), Annalisa De Cia (ESO), Joe Lyman (Warwick), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), J. Tonry, B. Stalder, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), A. Rest (STScI), D. Wright, K. C. Chambers, H. Flewelling, M. Huber, T. Lowe., E. Magnier, A. Schultz, C. Waters, R. J. Wainscoat, M. Wilman (IfA, Univ. Hawaii)
on 13 Nov 2017; 06:11 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Zuzanna Kostrzewa-Rutkowska (zkostrzewa@astrouw.edu.pl)

Subjects: Optical, Supernovae

ePESSTO, the extended Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts), by 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 ), by Pan-STARRS Survey for Transients (see Chambers et al. 2016, arXiv:1612.05560, and http://pswww.ifa.hawaii.edu ) and by the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680). All observations were performed on the ESO New Technology Telescope at La Silla on 2017 Nov. 11, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). Classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

 
Survey Name | IAU Name  | RA (J2000) | Dec (J2000) | Disc. Date | Source    | Disc Mag |  z    | Type               | Phase | Notes 
Gaia17cnk   | SN2017hcz | 22 20 06.42| -28 23 56.5 |  20171004  | Gaia      |   20.91  | 0.081 | SN Ia              |>+20d  | (1)  
ASASSN-17on | SN2017hya | 23 20 21.07| -34 37 28.1 |  20171110  | ASASSN    |   17.20  | 0.052 | SN Ia              |+11d   | (2)  
ASASSN-17os | SN2017hyy | 04 33 05.95| -26 07 40.5 |  20170921  | ASASSN    |   20.45  | 0.033 | SN II/IIb          |pre-max| (3) 
ATLAS17mwl  | SN2017hrh | 02 00 25.20| +03 19 20.6 |  20170922  | ATLAS     |   20.84  | 0.082 | SN Ia              |+8d    | (2)  
ATLAS17nbj  | SN2017hyn | 02 38 26.95| -08 02 09.7 |  20171008  | ATLAS     |   18.40  | 0.053 | SN Ia/91T-like     |-7d    | (1)  
ATLAS17msd  | SN2017hop | 02 59 35.03| -21 52 07.7 |  20170921  | ATLAS     |   20.34  | 0.067 | SN Ia              |>+20d  | (2)   
PS17ewn     | SN2017huu | 03 16 14.14| -18 19 01.5 |  20171030  | Pan-STARRS|   18.04  | 0.044 | SN Ia              |+16d   | (1) 
ASASSN-17om | SN2017hxz | 03 34 11.01| -13 56 08.9 |  20171110  | ASASSN    |   17.70  | 0.080 | SN II              |pre-max| (4)  

(1) Redshift from the host galaxy
(2) Redshift estimated with SNID
(3) Emission lines of H, He I, He II (4686),C III (5696), C IV (5801) at z=0.033. In edge on disk/irregular host consistent spectroscopic redshift. Recent non-detections with ATLAS imply a young SN of type II or IIb with high excitation lines. (4) Broad, shallow emission features of H-Balmer lines at z=0.08. Rise time of 20 days from ATLAS. At o=18, this is M ~ -20, and potentially a super luminous type II SN. It is continuing to rise and we expect evolution of the spectra, which has a strong blue continuum. Further observations are encouraged.