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Discovery of a possible galactic nova or CV, AT 2019ssv, with ZTF and IAC80 CAMELOT2

ATel #13284; I. V. Yanes-Rizo (ULL), J. Orell-Miquel (ULL), A. Madrigal-Aguado (ULL), F. Tinaut-Ruano (ULL & IAC), L. Alvarez-Hernandez (ULL), J. Bayer (ULL), A. Graña-Gonzalez (ULL), J. Kalies (ULL), A. J. Maas (ULL), O. Maireles-Gonzalez (ULL), B. Perez-Perez (ULL), R. Shirley (IAC and ULL) and I. Perez-Fournon (ULL & IAC)
on 11 Nov 2019; 14:09 UT
Credential Certification: Ismael Perez-Fournon (ipf@iac.es)

Subjects: Optical, Nova, Transient

We report the discovery of a possible galactic nova or CV based on observations with the CAMELOT2 camera of the IAC80 Telescope on October 20 2019 using the Sloan g, r and i filters. The object is well detected in all the bands. This transient was originally detected by ZTF (ZTF19acdytef) and reported to TNS by Tonry et al. (AT 2019ssv) as a Possible Supernova (PSN). It was also detected by ATLAS (ATLAS19ykn).

The IAC80 Camelot2 images were astrometrically calibrated using Gaia DR2. The object position on the IAC80 images is:

RA (J2000) = 01:26:19.083, Dec (J2000) = +74:01:57.94. There is no catalogued object at this position.

The transient magnitudes, calibrated using PanSTARRS-1 DR2 are:
g = 19.22 +/- 0.05 (2019-10-20 03:37:31.799 UT), 600 seconds
r = 19.12 +/- 0.04 (2019-10-20 03:47:45.810 UT), 600 seconds
i = 19.15 +/- 0.06 (2019-10-20 03:58:01.213 UT), 600 seconds
These magnitudes are not corrected for galactic extinction.

The shape of the ZTF+IAC80 light curve, with a fast rise from the last ZTF non-detection g < 20.262 on 2019-10-07 09:13:16 to the first ZTF detection, g = 18.498 +/- 0.086, on 2019-10-10 09:38:59 UT, which is close to the maximum of its light curve, strongly suggests that AT 2019ssv is a galactic nova or CV and not a supernova.

The ZTF light curve is available at the ZTF brokers (Lasair, ANTARES, MARS and ALeRCE), e.g.:

https://lasair.roe.ac.uk/object/ZTF19acdytef

We encourage spectroscopic follow-up of this possible galactic nova or CV.

Based on observations made with the IAC80 telescope operated on the island of Tenerife by the Instituto de Astrofisica de Canarias in the Spanish Observatorio del Teide. We thank the IAC80 staff for help with the observations. We are very grateful to David Bishop for his compilations of supernovae and extragalactic novae. http://www.rochesterastronomy.org/snimages

IAC80 CAMELOT2 Sloan g-band image cutout (2' x 2')