论文标题
GAIA19BXC：最低周期以下可能的极性
Gaia19bxc: possible polar below the period minimum
论文作者
论文摘要
GAIA19BXC是Gaia Photomecome Alerts Team于2019年5月9日检测到的瞬态。我分析了过去的公共Zwicky瞬态设施（ZTF）数据，发现GAIA19BXC的周期为0.044473647（3）和两个不同的最大值。该对象在ZTF数据中还显示出高和低状态。基于短期变化的高振幅（2.0 mag），短期，不同的ZTF频段之间的颜色几乎为零，并且没有更长的时间，我将其分类为可能的极性。在灾难性变量（CVS）的最低周期以下没有建立的极性，而Gaia19bxc可能是第一个这样的物体。最低周期低于周期的CV通常具有带有剥离的进化核心的次级恒星，而GAIA19BXC有望具有相似的次级恒星。如果确实如此，GAIA19BXC在其世俗的演化过程中可能会成为高度磁性的外来超级二进制二元。
Gaia19bxc is a transient detected on 2019 May 9 by the Gaia Photometric Science Alerts Team. I analyzed the past public Zwicky Transient Facility (ZTF) data and found that Gaia19bxc has a period of 0.04473647(3) d and two different maxima in one cycle. This object also showed high and low states in the ZTF data. Based on the high amplitude (2.0 mag) of the short-term variations, short period, almost zero color indices between the different ZTF bands and the absence of a longer period, I classified it to be a likely polar. There has been no established polar below the period minimum of cataclysmic variables (CVs) and Gaia19bxc could be the first such an object. CVs below the period minimum usually have a secondary star with a stripped evolved core and Gaia19bxc is expected to have a similar secondary. If this is indeed the case, Gaia19bxc could become a highly magnetized exotic ultracompact binary during its secular evolution.
