P. Szkody, A. Ho, L. Hillenbrand, T. Kupfer and the ZTF Variable Star Collaboration

The Zwicky Transient Facility began its 3 year time-domain survey in March 2018, using its camera with a 47 square degree field on the Palomar 48 inch Schmidt telescope. The observing cadence of the entire visible sky in g and r every 3 nights and the visible galactic plane in g and r every night is ideal for finding variable objects. Among this group are cataclysmic variables, which have disk instability outbursts causing increases of brightness by 2-8 magnitudes within 1-2 days. A summary of the CV results on over 200 candidates and previously known objects since the start of the survey are presented. Alert filtering and follow-up co-ordination was done by the GROWTH marshal funded by NSF PIRE grant 1545949. PS acknowledges support from NSF grant AST 1514737.

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Abstract

ZTF Observations of the Disk Formation and Dissipation Process in the Eruptive Be Star HO Puppis

C.-D. Lee, C.-C. Ngeow, P.-C. Yu, J.-Y. Ou and ZTF Collaboration

The hot circumstellar gas in the line-emitting region of Be stars were mainly supplied by the eruptive stellar activity like matter outburst, known as decretion disk. During the outburst events, because of the obscuration along the line of sight from popped up materials, such Be stars will display dips or fading on their light curves, together with the spectroscopic brightening in Balmer lines. However, a well-covered spectroscopic follow up observationswas rarely achieved, because most of the fading events last more than hundreds days. In this work, we report the finding of fading events for HO Pup, a Be star known as Gamma Cassiopeia type variable, based on a few months commissioning data from the Zwicky Transient Facility (ZTF). The g and r band light curves from ZTF clearly displayed the fading events up to 2.5 magnitudes. We supplemented the ZTF data with light curve data from ASAS-SN survey, the combined light curves clearly display eruptive variability in the past 4 years. Together with the proposed spectroscopic observations, we may witnessing the entire disk decretion process including formation and dissipation for HO Pup.

Finding Cataclysmic Variables in the ZTF

P. Szkody, A. Ho, L. Hillenbrand, T. Kupfer and the ZTF Variable Star Collaboration

The Zwicky Transient Facility began its 3 year time-domain survey in March 2018,
using its camera with a 47 square degree field on the Palomar 48 inch
Schmidt telescope. The observing cadence of the entire visible sky in g and
r every 3 nights and the visible galactic plane in g and r every night is
ideal for finding variable objects. Among this group are cataclysmic
variables, which have disk instability outbursts causing increases of
brightness by 2-8 magnitudes within 1-2 days. A summary of the CV results
on over 200 candidates and previously known objects since the start of the
survey are presented.

Alert filtering and follow-up co-ordination was done by the GROWTH marshal funded by
NSF PIRE grant 1545949. PS acknowledges support from NSF grant AST 1514737.

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-- Thomas Kupfer - 2018-10-05

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