论文标题
40.5分钟的多频光曲线分析黯然失色双排定二元SDSS J082239.54 $+$+$ 304857.19
Multi-band light curve analysis of the 40.5-minute period eclipsing double-degenerate binary SDSS J082239.54$+$304857.19
论文作者
论文摘要
我们介绍了Apache点天文台BG40宽带和同时的双子座$ r $ - 乐队和$ i $ -band高速随访光度法观察以及40.5分钟的分析截止的双层二元SDSS J082239.54 $+$ 304857.19。我们的APO数据跨越318天，包括13个主要的日食，我们从中可以准确地测量系统的轨道周期，并改善复活中期测量的时间。我们分别适合每个过滤器的光线曲线，并表明该系统包含一个低质量的Da White Dwarf，radius $ r_a = 0.031 \ pm0.006〜 {\ rm r_ \ odot} $和$ r_b = 0.013 \ pm0.005〜 $ i = 87.7 \ pm0.2^\ circ $。我们使用最合适的光曲线模型来估计次级恒星的温度为$ t _ {\ rm eff} = 5200 \ pm100〜 {\ rm k} $。最后，虽然我们没有以1年的基线为重力波排放引起的重力波引起的中期中期时间的重大偏移，但我们表明，由于重力波将在2023年可能会导致轨道衰减的显着测量，这将在2023年可能发生，这在这一点上大约要比预期的是$ 8 $ $ 8 $。
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 $3σ$ 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.
