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Kupfer, Thomas; Prince, Thomas A.; van Roestel, Jan; Bellm, Eric C.; Bildsten, Lars; Coughlin, Michael W.; Drake, Andrew J.; Graham, Matthew J.; Klein, Courtney; Kulkarni, Shrinivas R.; Masci, Frank J.; Walters, Richard; Andreoni, Igor; Biswas, Rahul; Bradshaw, Corey; Duev, Dmitry A.; Dekany, Richard; Guidry, Joseph A.; Hermes, J. J.; Laher, Russ R.; Riddle, Reed
Monthly notices of the Royal Astronomical Society, 07/2021, Letnik: 505, Številka: 1Journal Article
We present the goals, strategy, and first results of the high-cadence Galactic plane survey using the Zwicky Transient Facility (ZTF). The goal of the survey is to unveil the Galactic population of short-period variable stars, including short-period binaries, and stellar pulsators with periods less than a few hours. Between 2018 June and 2019 January, we observed 64 ZTF fields resulting in 2990 deg 2 of high stellar density in the ZTF- r band along the Galactic plane. Each field was observed continuously for 1.5 to 6 h with a cadence of 40 sec. Most fields have between 200 and 400 observations obtained over 2–3 continuous nights. As part of this survey, we extract a total of ≈230 million individual objects with at least 80 epochs obtained during the high-cadence Galactic plane survey reaching an average depth of ZTF– r ≈ 20.5 mag. For four selected fields with 2–10 million individual objects per field, we calculate different variability statistics and find that ≈1–2 per cent of the objects are astrophysically variable over the observed period. We present a progress report on recent discoveries, including a new class of compact pulsators, the first members of a new class of Roche lobe filling hot subdwarf binaries as well as new ultracompact double white dwarfs and flaring stars. Finally, we present a sample of 12 new single-mode hot subdwarf B-star pulsators with pulsation amplitudes between ZTF– r = 20–76 mmag and pulsation periods between P = 5.8–16 min with a strong cluster of systems with periods ≈6 min. All of the data have now been released in either ZTF Data Release 3 or Data Release 4.
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