Spectroscopic and photometric observations of the supernova ZTF20aayknlo/Gaia20cgo/SN2020jee
ATel #13861; Ismailov N. Z., Mikhailov Kh. M., Khalilov O. V., Alekberov I. A., Bagirli S., Alishov S. A. (Shamakhy Astrophysical Observatory of National Academy of Sciences, Azerbaijan), Wyrzykowski L., Zielinski P., Gezer I., Ihanec N. (Warsaw University Astronomical Observatory, Poland)
on 11 Jul 2020; 14:07 UT
Credential Certification: Pawel Zielinski (pzielinski.astro@gmail.com)
Subjects: Optical, Supernovae, Transient
Supernova ZTF20aayknlo/Gaia20cgo/SN2020jee was first detected on 2020-05-05 by the ZTF survey at coordinates RA(2000)=11:42:14.70, DEC(2000)=20:05:51.07 and was classified as SN Type Ia (Dahiwale
et al. 2020, https://wis-tns.weizmann.ac.il/object/2020jee). The object is located approximately in the center of a very weakly radiating galaxy MCG + 03-30-048 in a large cluster of galaxies in this region. Here, we report on photometric and spectroscopic follow-up observations of this target from May 21 to June 23, 2020, obtained with 2 m Shamakhy Astrophysical Observatory (ShAO) telescope in Azerbaijan. Spectral observations were made at the Cassegrain focus of the 2 m telescope with UAGS+objective Canon EF (f=200 mm, f/2) + CCD Andor (iKonL-936-BEX2-DD 2048x2048, px=13.5 um) spectrograph. The spectral range is 3750-7650 A. The width of the slit was 3.3". The spectral resolution is about 6 A/px. Spectrophotometric standard stars were observed every night immediately after the object. The spectra were processed with IRAF and DECH software. Photometry was carried out on a 30 cm guide-refractor of the 2 m telescope. A photometer with broadband filters BVRc is installed in the focus of the refractor tube (f=5050 mm). The light receiver was a CCD FLI 2048x3072.
BV photometry
Date UT JD Bands Mag Mag_error B-V
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21.05.2020 18:14:24 2458991.26 V 15.45 0.01 0.719
21.05.2020 18:43:12 2458991.28 B 16.169 0.02
27.05.2020 18:57:36 2458997.29 V 15.15 0.005 0.71
27.05.2020 19:26:24 2458997.31 B 15.86 0.006
16.06.2020 19:12:00 2459017.30 V 16.259 0.010 1.039
23.06.2020 18:43:12 2459024.28 V 16.342 0.02
23.06.2020 19:12:00 2459024.30 B 17.381 0.03
Spectral observations
Date UT JD Sp. range [A] Exp [sec] S/N
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21.05.2020 18:24 2458991.26 3700-8000 3600 345
27.05.2020 19:06 2458997.29 3700-8000 2000 220
16.06.2020 19:32 2459017.31 3700-8000 3000 95
23.06.2020 18:17 2459024.26 3700-8000 2000 115
The maximum brightness spectrum shows bands of the Si II, Fe II, Fe III, Ca II line groups which are clearly distinguished. We measured the shift of the Si II line, where two lines at 6347+6371 A are dominated. On May 21, 2020, the enhancement velocity of the photosphere shell was obtained at about -10116 +/- 15 km/s. The photometric and spectroscopic data can be requested from the authors.
Acknowledgments. This project has received funding from the EU Horizon 2020 research and innovation programme under grant agreement No. 730890. We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team ( http://gsaweb.ast.cam.ac.uk/alerts).
