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ePESSTO spectroscopic classification of optical transients

ATel #10338; C. P. Gutierrez, R. Cartier, M. Smith (Southampton), J. 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)
on 1 May 2017; 19:34 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Mathew Smith (matsmith2@gmail.com)

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 ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680) and the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts). All observations were performed on the ESO New Technology Telescope at La Silla on 2017 April 30, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024). The 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  
Gaia17bai   | SN2017dcg |05 16 05.04 | -16 07 31.1 | 20170415 | Gaia    |   18.6    | 0.072 |  Ia   |  >+20d    | 
ATLAS17ezf  | SN2017djt |08 51 21.34 | +22 56 39.6 | 20170422 | ATLAS   |   18.8    | 0.088 |  Ia   | +4 to +7d | (1) 
ATLAS17ezu  | SN2017djz |11 47 51.81 | -33 49 35.6 | 20170408 | ATLAS   |   18.1    | 0.072 |  Ia   |  at max   | 
ATLAS17euf  | SN2017dia |12 17 28.84 | +03 02 54.1 | 20170425 | ATLAS   |   18.9    | 0.111 |  Ia   |  at max   | 
Gaia17bah   | SN2017dcf |16 26 24.64 | +21 18 59.4 | 20170416 | Gaia    |   18.9    | 0.060 |  Ia   | +8 to +10d| 
Gaia17bce   | AT2017dhx |18 38 39.97 | -37 36 40.4 | 20170424 | Gaia    |   18.3    |       |       |           | (2) 
Gaia17bby   | SN2017dgw |19 06 51.82 | -36 57 31.5 | 20170422 | Gaia    |   18.6    | 0.018 |  Ia   | +8 to +10d| (3) 
Gaia17bbv   | SN2017dgt |01 27 56.68 | -50 41 14.3 | 20170422 | Gaia    |   18.1    | 0.064 |  Ia   | +4 to +7d | (4) 
Gaia17baj   | SN2017dch |19 55 35.69 | -11 38 22.7 | 20170415 | Gaia    |   18.2    | 0.048 |  Ic   |  at max   | 
 
(1) The spectrum shows a strong narrow Na I D absorption line consistent with the redshift of the host galaxy (z~0.088).
(2) Transient showing a blue featureless continuum and located close to the Galactic plane.
(3) Very red and noisy spectrum, exhibiting broad SN Ia features at the redshift of the host galaxy obtained from NED. No clear Na I D narrow absorption lines.
(4) The SN site is in the galaxy ESO 196-G 005. This galaxy is listed as having z=0.031 from 6dF, although visual inspection indicates z=0.064, consistent with the transient spectrum.