Spectrum of supernova 2020hvf


SN 2020hvf is a bright supernova in SB0+(r) edge-on galaxy NGC 3643 in constellation Leo. With actual brightness of V~12.9 mag it is still reachable whithin the Alpy600 spectrograph, but it needs good weather conditions. At my location the object reaches a maximum altitude of 45°, it was quite low during exposure (42° - 21°).


Data about supernova 2020hvf

Position: RA 11h 21m 26s.450, DEC +03° 00' 52".85
Host galaxy: NGC 3643, z=0.00584
Discovery: 2020-04-21.380 by ATLAS
max. Brightness: V=12.9 mag (2020-05-18)
Type of SN: Ia


Image and spectrum of supernova 2020hvf

Image of supernova 2020hvf in NGC 3643
2020-05-18 22:41 - 23:28 UT, Roof Observatory Kaufering, 14" ACF teleskop on Taurus GM-60 mount, CCD camera: Moravian G2-8300FW, 3x3 Binning, guiding mit DMK 21AU618.AS und PHD2, L-filter, 35x60s; magnitude measured with Astrometrica: V=12.9 mag; See SN 2020hvf at Latest Supernovae page for more information and images.



Here is my spectrum of this supernova:

Spectrum of supernova 2020hvf 2020-05-20
2020-05-20 20:54 - 22:45 UT, Roof Observatory Kaufering, Meade 14" ACF telescope on Taurus GM-60 mount, Astro Physics reducer CCDT67, Alpy600 with guiding unit, CCD camera: Atik 428EX, guiding camera: ASI 120 MM; recording software: AstroArt, guiding by hand (PHD2 lost the weak guide star permanent);
Wavelength calibration: Hg lines from energy saving lamp and Ne lines from flicker flame light bulbs, instrumental response calibration: with reference star HD 98664, B9.5 V, data reduction: with Integrated Spectrographic Innovative Software from Christian Buil;
The spectrum has been cut at the near UV end (3790 Å) due to strong noise.




Classification of supernova 2020hvf

The classification with two independent methods shows clearly a type Ia.

1) Classification with GELATO (Padova-Asiago Supernova Group), see [1].

Identification of supernova 2020hvf with GELATO

Identification of supernova 2020hvf 2020-05-20, best matching plot
Spectrum from 2020-05-20 best matches to SN 2003kf (Ia) with an age of 11.5 d (Quality factor: 2.37) - visually a bad match.

Identification of supernova 2020hvf 2020-05-20, matching plot #14
Spectrum from 2020-05-20 plot #14 matches SN 2003du (Ia) with an age of 10.0 d (Quality factor: 1.92) - visually a better match!


2) Classification with SNID (SuperNova IDentification), see [2].

Identification of supernova 2020hvf with SNID
Spectrum from 2020-05-20 second best matches to SN 2008Z (Ia-norm) with an age of 12 d

In both tools the red shift (z=0.00584) of host galaxy has been entered.
Assuming an age of 12 d, the maximum brightness must have been around May 8th 2020. This is confirmed perfectly by ASASSN Sky Patrol lightcurve of SN 2020hvf [3].

Note: The age in both tools (GELATO and SNID) is given in days since maximum brightness.






References:
[1] Harutyunyan et al., 2008, A&A, 488, 383
[2] Blondin & Tonry 2007, ApJ, 666, 1024
[3] Shappee et al. (2014) and Kochanek et al. (2017)



My other spectroscopic observations: Spektroskopie (mostly in German)



[ updated: 2020-05-24 | Email icon Gregor Krannich | Gregors astronomy page ]