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SAO RAS spectral classification of SN candidates

ATel #9310; Fatkhullin T. A., Moskvitin A. S. (SAO RAS, Russia)
on 3 Aug 2016; 22:44 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)

Subjects: Optical, Supernovae, Transient

We observed five SN candidates (AT 2016eld, AT 2016eku, MASTER OT J225939.54+020859.6, AT 2016ekw and AT 2016elw) with the BTA/Scorpio-I on the night of August, 2/3. Direct images in the V band and long-slit spectra in the range of 3600-7600AA (resolution FWHM = 10A) were obtained. The spectra were cross-correlated with the SNID library
(Blondin & Tonry, ApJ, 666, 1024, 2007).

AT 2016eld (= Gaia16awx) was observed on August, 2, 18:55--19:27 UT. The AT 2016eld spectrum best matched to the normal Type Ic SN 1994I, 2 days after the maximum light. Estimation of the redshift with the SNID gives z = 0.039 +/- 0.006. Also in the spectrum we detected a series of emission lines (Halpha, [N II] 6583A, Hbeta, [O II] 3727A/3729A, [O III] 5007A) from the host galaxy PGC 1212394, redshifted by z = 0.028.

AT 2016eku (= PS16dnl) was observed on August, 2, 19:41--20:34 UT. The AT 2016eku spectrum best matched to the normal Type Ia SN 1994ae, 30 days after the maximum light, redshifted by z = 0.105 +/- 0.004.

MASTER OT J225939.54+020859.6 was observed on August, 2, 23:08--23:41. The SN candidate was observed with the BTA/Scorpio since few hours after the discovering by the MASTER team (Balanutsa et al., ATel #9302). Cross-correlation of the spectrum with the SNID database showed that object resembles the normal Type Ia SN 1994M, 4 days after the maximum light redshifted by z = 0.061 +/- 0.003. The brightness of the object during our observations was V = 17.81 +/- 0.03. Applying the brightness of the underlying host galaxy SDSS 225939.63+020858.8, and estimated redshift, the absolute magnitude of the supernova is Mv = -19.3 (at moment of observations), which is typical value for the type Ia SN (Hillebrandt & Niemeyer, Annual Review of Astronomy and Astrophysics, 38, 191, 2000).

AT 2016ekw (= PS16dnn) was observed on August, 2, 23:06--23:13 UT. Acquisition images of 220 sec. total exposure in the V band were obtained. We did not detect the object down to the 3-sigma limiting magnitude V_lim = 24.4 mag. Calibration was made using nearby SDSS stars.

AT 2016elw (= PS16dnv) was observed on August, 2/3, 23:26--00:31 UT. The AT 2016elw spectrum best matched to the normal Type Ia SN 1999ee, near the maximum light, redshifted by z = 0.160 +/- 0.004. We also detected host galaxy emission lines
([O II] 3727A/3729A, [O III] 5007A) at the redshift z = 0.162, which is in the perfect agreement with the SNID estimation.