Follow-up observations of optical transients ZTF19abraqpf and ZTF19abqstxq
ATel #13055; Monika Soraisam (NOAO), Chien-Hsiu Lee (NOAO), Gautham Narayan (UIUC), Thomas Matheson (NOAO), Abhijit Saha (NOAO), Arizona-NOAO Temporal Analysis and response to Events System (ANTARES) team, Thomas G. Brink, Kishore C. Patra, Thomas de Jaeger, WeiKang Zheng, Benjamin E. Stahl, Alexei V. Filippenko (UC Berkeley)
on 30 Aug 2019; 16:28 UT
Credential Certification: Monika Soraisam (soraisam@noao.edu)
Subjects: Optical, Cataclysmic Variable, Nova, Transient
Referred to by ATel #: 13101
We report the spectroscopic observations of two optical transients flagged by a custom filter on the ANTARES alert-broker (https://antares.noao.edu/) from the public alert stream of the ZTF survey.
Name | RA (J2000) | Dec (J2000) | First detection: MJD, mag | Decline rate | Light curve from ANTARES
ZTF19abraqpf (at2019onf) | 20:14:18.06 | 51:43:23.95 | 58717.292928, g~19.1+/-0.1 | ~0.2 mag/day | https://antares.noao.edu/alerts/locus/4760097
ZTF19abqstxq (at2019nzq) | 19:46:04.96 | 55:33:01.09 | 58716.286678, R~17.5+/-0.05 | ~0.16 mag/day | https://antares.noao.edu/alerts/locus/4749322
On 2019 August 25 UT, we obtained the spectra of these sources with the Kast double spectrograph on the Shane 3 m telescope at Lick Observatory. The spectrum of ZTF19abraqpf shows Balmer lines (H-alpha and H-beta) in emission; the FWHM of the H-alpha line is around 680 km/s. The photometric and spectroscopic observations of this source indicate a nova outburst. The non-Balmer lines in the spectrum are, however, too weak to determine the spectral class of this nova; nevertheless, its fast decline rate indicates a He/N type. The spectrum of ZTF19abqstxq shows broad Balmer-line absorption typical of dwarf novae.
