SALT spectroscopic follow-up of the bright type Ia SN AT2020nvb
ATel #13858; E. Aydi (MSU), D. A. H. Buckley (SAAO), S. Dong, P. Chen (PKU), L. Chomiuk (MSU), C. S. Kochanek and K. Z. Stanek (OSU)
on 3 Jul 2020; 15:56 UT
Credential Certification: Elias Aydi (eaydi@saao.ac.za)
Subjects: Optical, Binary, Star, Supernovae, Transient, Variables
Referred to by ATel #: 13937
We report on high-resolution optical spectroscopy of the bright type Ia SN AT2020nvb in NGC 4457, which was discovered by Koichi Itagaki on 2020-07-1.55UT (see classification ATels #13848, #13849 and ASAS-SN light curve).
On 2020-07-02.72.UT we obtained a 1200 s spectrum using the High Resolution Spectrograph (HRS; Crause et al. 2014, Proc. SPIE, 91476) mounted on the 11m Southern African Large Telescope as part of the SALT Large Science Program on Transients. The observations were taken in the MR mode of HRS which covers the spectral range of 3800-8900 A at a resolution of R=36000. The data were reduced with the SALT HRS MIDAS pipeline (Kniazev et al. 2016, MNRAS 459, 3068).
The spectrum shows broad Si II, S II, O I, and Mg II lines. The absorption troughs of the P Cygni profiles are at a velocity of around -13000 km/s as measured from the Si II lines, consistent with the conclusions of ATel #13848. For the velocity measurements we use a redshift of 0.002939. We also detect weak and narrow emission lines of Halpha and [N II] 6548 and 6583 A. The FWHM of these lines is around 70 km/s, consistent with their origin from the host galaxy.
Follow up observations in all bands are encouraged.
