Multiband light-curve analysis of the 40.5-min period eclipsing double-degenerate binary SDSS J082239.54+304857.19
Multiband light-curve analysis of the 40.5-min period eclipsing double-degenerate binary SDSS J082239.54+304857.19
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DOI：
10.1093/mnras/staa3571
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发表时间：
2020-11
影响因子：
4.8
通讯作者：
A. Kosakowski;M. Kilic;Warren R. Brown
中科院分区：
文献类型：
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作者：
A. Kosakowski;M. Kilic;Warren R. Brown
我们展示了阿帕奇点天文台 BG40 宽带和同步双子座 $r$ 波段和 $i$ 波段高速后续光度测量观测和对 40.5 分钟食分离双简并双星 SDSS J082239.54$+304857.19 周期的分析。我们的APO数据跨越318天，包括13次主日食，我们从中精确测量系统的轨道周期并改进中日食测量的时间。我们分别拟合每个滤光片的光变曲线，并表明该系统包含一颗半径为 $R_A=0.031\pm0.006~{\rm R_\odot}$ 的低质量 DA 白矮星和一个倾角为 $i=87.7\pm0.2^\circ$ 的 $R_B=0.013\pm0.005~{\rm R_\odot}$ 伴星。我们使用最拟合的食光曲线模型来估计次星的温度为$T_{\rm eff}=5200\pm100~{\rm K}$。最后，虽然我们没有记录与 1 年基线相比由引力波发射引起的预计日食时间的显着偏移，但我们表明，在 2023 年，可能对引力波引起的轨道衰变进行 $3\sigma$ 的显着测量，届时日食将比预期早约 $8$ 秒发生。
We present the Apache Point Observatory BG40 broadband and simultaneous Gemini $r$-band and $i$-band high-speed follow-up photometry observations and analysis of the 40.5 minute period eclipsing detached double-degenerate binary SDSS J082239.54$+$304857.19. Our APO data spans over 318 days and includes 13 primary eclipses, from which we precisely measure the system's orbital period and improve the time of mid-eclipse measurement. We fit the light curves for each filter individually and show that this system contains a low-mass DA white dwarf with radius $R_A=0.031\pm0.006~{\rm R_\odot}$ and a $R_B=0.013\pm0.005~{\rm R_\odot}$ companion at an inclination of $i=87.7\pm0.2^\circ$. We use the best-fitting eclipsing light curve model to estimate the temperature of the secondary star as $T_{\rm eff}=5200\pm100~{\rm K}$. Finally, while we do not record significant offsets to the expected time of mid-eclipse caused by the emission of gravitational waves with our 1-year baseline, we show that a $3\sigma$ significant measurement of the orbital decay due to gravitational waves will be possible in 2023, at which point the eclipse will occur about $8$ seconds earlier than expected.