Spectrum of supernova 2020ue

SN 2020ue is a bright supernova in elliptical galaxy NGC 4636 in constellation Virgo. With actual brightness of V~13.5 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°.

Data about supernova 2020ue

Position: RA 12h 42m 46s.765, DEC +02° 39' 34".25
Host galaxy: NGC 4636, z=0.00307
Discovery: 2020-01-12.722 by Koichi Itagaki
max. Brightness: V=12.1 mag (~2020-01-24)
Type of SN: Ia

Image and spectrum of supernova 2020ue

Image of supernova 2020ue in NGC 4636
2020-01-18 04:01 - 04:16 UT, remote-imaging via itelescope.net: T21 (Planewave 17" CDK, 431/1940, f/4.5 on Planewave Ascension 200HR) in New Mexico, USA with FLI-PL6303E CCD camera, L-filter, 10x60s; magnitude measured with Astrometrica: 12.0 mag; See SN 2020ue at Latest Supernovae page for more information and images.

Here is my spectrum of this supernova:

Spectrum of supernova 2020ue 2020-02-09
2020-02-09 02:24 - 04:40 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 software: PHD2;
Wavelength calibration: Hg lines from energy saving lamp and Ne lines from flicker flame light bulbs, instrumental response calibration: with reference star HD 109860, A0 V, data reduction: with Integrated Spectrographic Innovative Software from Christian Buil;
The spectrum has been cut at the near UV end (3700 Å) due to strong noise.

Classification of supernova 2020ue

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

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

Identification of supernova 2020ue with GELATO

Identification of supernova 2020ue 2020-02-09
Spectrum from 2020-02-09 second best matches to SN 1994D (Ia) with an age of 14.7 d (Quality factor: 3.04) - visually the best match.

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

Identification of supernova 2020ue with SNID
Spectrum from 2020-02-09 best matches to SN 1995ak (Ia-norm) with an age of 17.4 d

In both tools the red shift (z=0.00307) of host galaxy has been entered. If Jan, 24th 2020 is assumed as the day of maximum brightness, there are 16 days since, both ages are close estimates.
Note: The age in both tools (GELATO and SNID) is given in days since maximum brightness.

[1] Harutyunyan et al., 2008, A&A, 488, 383
[2] Blondin & Tonry 2007, ApJ, 666, 1024

My other spectroscopic observations: Spektroskopie (German)

[ updated: 2021-02-06 | Email icon Gregor Krannich | Gregors astronomy page ]