We report the discovery of a one magnitude increase in the optical brightness of the 59.63 minutes orbital period AM CVn binary SDSS J113732.32+405458.3. Public g, r, and i band data from the Zwicky Transient Facility exhibit a subsequent decline over a 300 days period, while a few data points from commissioning show that the peak was likely seen. Such an outburst is likely due to a change in the state of the accretion disk, making this the longest period AM CVn binary to reveal an unstable accretion disk. The object is now back to its previously observed (by SDSS and PS-1) quiescent brightness that is likely set by the accreting white dwarf. Prior observations of this object also imply that the recurrence times for such outbursts are likely more than 12 yr.

我们报告发现在59.63分钟的轨道周期AM CVn二进制SDSS J113732.32 + 405458.3。的光学亮度增加了一个量级。Zwicky瞬态设施的公开g，r和i波段数据在300天内呈现出随后的下降趋势，而调试中的一些数据表明峰值很可能已经出现。这样的爆发很可能是由于吸积盘状态的变化所致，这使其成为最长的AM CVn二进制周期，以显示不稳定的吸积盘。现在，该对象恢复到其先前观察到的（通过SDSS和PS-1）静态亮度，该亮度可能是由吸积的白矮星设置的。对该对象的先前观察还暗示，此类爆发的复发时间可能超过12年。