A 15.7-Minute AM CVn Binary Discovered in K2
A 15.7-Minute AM CVn Binary Discovered in K2
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DOI：
10.1093/mnras/sty1032
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发表时间：
2018-04
影响因子：
4.8
通讯作者：
M. Green;J. Hermes;T. Marsh;D. Steeghs;K. Bell;S. Littlefair;S. Parsons;E. Dennihy;J. Fuchs-J.-Fu
中科院分区：
文献类型：
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作者：
M. Green;J. Hermes;T. Marsh;D. Steeghs;K. Bell;S. Littlefair;S. Parsons;E. Dennihy;J. Fuchs-J.-Fu
我们发现了SDSS J135154.46−064309.0，这是一个在K2 Campaign 6中使用30分钟测光观测到的短周期变星。后续的光谱学和高速测光支持分类为一个新成员的罕见的超紧凑吸积双星称为AM CVn星。光谱轨道周期为15.65 ± 0.12分钟，是已知第四短周期的AM CVn，也是开普勒太空船发现的第二个这类系统。K2数据显示光度周期为15.7306 ± 0.0003 min、16.1121 ± 0.0004 min和664.82 ± 0.06 min，我们分别将其确定为轨道周期、超级峰周期和盘岁差周期。根据超峰和轨道周期，我们估计双星的质量比q = M2/M1= 0.111 ± 0.005，虽然这种确定质量比的方法可能无法很好地校准氦主导的双星。这个系统很可能是一个明亮的前景源的引力波的频率范围内可探测的激光干涉仪空间天线，并可能作为校准源，如果未来的研究能够限制其恒星组件的质量。
We present the discovery of SDSS J135154.46−064309.0, a short-period variable observed using 30-mincadence photometry in K2 Campaign 6. Follow-up spectroscopy and high-speed photometry support a classification as a new member of the rare class of ultracompact accreting binaries known as AM CVn stars. The spectroscopic orbital period of 15.65 ± 0.12 min makes this system the fourth-shortest-period AM CVn known, and the second system of this type to be discovered by the Kepler spacecraft. The K2 data show photometric periods at 15.7306 ± 0.0003 min, 16.1121 ± 0.0004 min, and 664.82 ± 0.06 min, which we identify as the orbital period, superhump period, and disc precession period, respectively. From the superhump and orbital periods we estimate the binary mass ratio q = M2/M1= 0.111 ± 0.005, though this method of mass ratio determination may not be well calibrated for helium-dominated binaries. This system is likely to be a bright foreground source of gravitational waves in the frequency range detectable by Laser Interferometer Space Antenna, and may be of use as a calibration source if future studies are able to constrain the masses of its stellar components.