Classification certificate for object 2018pv
TNS Classification Report No. 1707 [ 2018TNSCR.181....1Y ]

Date Received (UTC): 2018-02-08 18:48:56
Sender: Dr. Masayuki Yamanaka
Group: None

Masayuki Yamanaka report/s a classification of object: SN 2018pv

Type: SN Ia
Redshift: 0.0031

Remarks: SN Ia at the premaximum phase

The following Classification spectrum was provided:

Obsdate: 2018-02-08 16:47:59
Instrument: HOWPol
Telescope: KANATA 1.5-m Optical and Near-Infrared telescope

Remarks: The spectrum resembles with that of a normal Type Ia supernova (SN Ia) at the pre-maximum stage. Using the automatic SN classification tool, GELATO (Harutyunyan et al., 2008, A&A, 488, 383), the spectrum would be similar to that of SN 1992A at the 5 days before maximum. We identified the absorption lines of the CaII IR triplet, OI 7774, SiII 6355, SiII 5972, SII W-shape feature, and Fe II multiplet in our spectrum. The CaII IR triplet, OI 7774, and SiII 6355 line velocities were measured to be ~16500, ~16500, and ~13000 km/s, respectively. The SiII 5972 absorption line was significantly deeper than that of SN 1992A, suggesting that this SN might be a more subluminous event. We measured the equivalent width (EW) of the NaID line as to 0.9 angstrom, suggesting that the host galactic extinction could be very large (A_V~0.5-2.0). Even if the extinction is corrected for, this SN could be still in the rising phase. Follow-up observations could be encouraged.

Details of the object and its spectra can be viewed here: