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Four new eclipsing accreting ultracompact white dwarf binaries found with the Zwicky Transient Facility
Astronomy & Astrophysics ( IF 6.5 ) Pub Date : 2024-03-13 , DOI: 10.1051/0004-6361/202349010
J.M. Khalil , J. van Roestel , E.C. Bellm , J.S. Bloom , R. Dekany , A.J. Drake , M.J. Graham , S.L. Groom , S.R. Kulkarni , R. Laher , A. Mahabal , T. Prince , R. Riddle

Context. Accreting ultracompact white dwarf binaries contain a white dwarf that is accreting from a degenerate object. They have orbital periods shorter than 65 min.Aims. We report the discovery and the orbital period of four new eclipsing accreting ultracompact white dwarf binaries found using the Zwicky Transient Facility (ZTF) and discuss their photometric properties.Methods. We searched through a list of 4171 dwarf novae compiled using the ZTF and used the box least square method to search for periodic signals in the data.Results. We found four eclipsing accreting ultracompact binaries with orbital periods between 25.9 and 56 min. One had previously been published as an AM Canum Venaticorum (AM CVn), and the other three systems are new discoveries. The two shorter-period systems are likely also AM CVn systems, while the longest-period system, with a period of 56 min, showed multiple super-outbursts over two years, which is more consistent with it being a helium CV.

中文翻译:

兹威基瞬态设施发现了四个新的食吸积超紧凑白矮星双星

语境。吸积超紧凑白矮星双星包含一颗从简并星体吸积的白矮星。它们的轨道周期短于 65 分钟。目标。我们报告了使用兹威基瞬变设施(ZTF)发现的四个新的食吸积超紧凑白矮星双星的发现和轨道周期,并讨论了它们的光度特性。方法。我们搜索了使用 ZTF 编制的 4171 个矮新星列表,并使用盒最小二乘法搜索数据中的周期性信号。结果。我们发现了四个食吸积超致密双星,其轨道周期在 25.9 至 56 分钟之间。其中一个先前已作为 AM Canum Venaticorum (AM CVn) 发表,其他三个系统是新发现的。这两个周期较短的系统很可能也是 AM CVn 系统,而周期最长的系统(周期为 56 分钟)在两年内出现了多次超级爆发,这更符合其是氦 CV 的情况。
更新日期:2024-03-13
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