A Systematic Search for Outbursting AM CVn Systems with the Zwicky Transient Facility
A Systematic Search for Outbursting AM CVn Systems with the Zwicky Transient Facility
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DOI：
10.3847/1538-3881/ac0622
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发表时间：
2021-05
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通讯作者：
J. Roestel;Leah Creter;T. Kupfer;P. Szkody;J. Fuller;M. Green;R. Rich;J. Sepikas;K. Burdge;I. Caiazzo;P. Mróz;T. Prince;D. Duev;M. Graham;D. Shupe;R. Laher;A. Mahabal;F. Masci
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作者：
J. Roestel;Leah Creter;T. Kupfer;P. Szkody;J. Fuller;M. Green;R. Rich;J. Sepikas;K. Burdge;I. Caiazzo;P. Mróz;T. Prince;D. Duev;M. Graham;D. Shupe;R. Laher;A. Mahabal;F. Masci
AM CVn系统是一种罕见的吸积双星，由一颗白色矮星和一颗富氦的简并施主星星组成。使用Zwicky Transient Facility（ZTF），我们通过关注蓝色爆发的恒星来寻找新的AM CVn系统。我们首先使用ZTF警报选择爆发恒星。我们将候选者与盖亚和泛星目录进行了交叉匹配。基于Gaia BP-RP的候选者的初始选择包含1751个未知对象。我们使用Pan-STARRS g-r和r-i颜色与Gaia颜色组合来识别59个强AM CVn候选者。我们获得了35个源的识别光谱，其中18个是高优先级的候选人，并发现了9个新的AM CVn系统和一个磁CV，只显示He-II线。使用爆发重现时间，我们估计的轨道周期的9个新的AM CVn系统，在29-50分钟的范围内。我们的结论是，有针对性的后续蓝色，爆发源是一种有效的方法来寻找新的AM CVn系统，我们计划跟进我们确定的所有候选人，系统地研究人口的爆发AM CVn系统。
AM CVn systems are a rare type of accreting binary that consists of a white dwarf and a helium-rich, degenerate donor star. Using the Zwicky Transient Facility (ZTF), we searched for new AM CVn systems by focusing on blue, outbursting stars. We first selected outbursting stars using the ZTF alerts. We cross matched the candidates with Gaia and Pan-STARRS catalogs. The initial selection of candidates based on the Gaia BP-RP contains 1751 unknown objects. We used the Pan-STARRS g-r and r-i color in combination with the Gaia color to identify 59 strong AM CVn candidates. We obtained identification spectra of 35 sources, of which 18 are high-priority candidates, and discovered nine new AM CVn systems and one magnetic CV that shows only He-ii lines. Using the outburst recurrence time, we estimate the orbital periods of the nine new AM CVn systems that are in the range of 29–50 minutes. We conclude that targeted follow up of blue, outbursting sources is an efficient method to find new AM CVn systems and we plan to follow up all candidates we identified to systematically study the population of outbursting AM CVn systems.