论文标题
苔丝白色矮人GD 394处的1.1天变异性的光学检测
Optical detection of the 1.1-day variability at the white dwarf GD 394 with TESS
论文作者
论文摘要
最近的发现表明，行星系统通常会在其宿主恒星的后序列演变中幸存下来，从而使由此产生的白色矮人拥有丰富的环境环境。在这种宿主中，最吸引人的是热白矮人GD 394，在1990年代中期在Extremulviolet Explorer（EUVE）观察结果中检测到了独特的$ 1.150 \ pm0.003 $ d通量变化。这种变化避免了令人满意的解释，但是假设包括引导积聚，产生了金属的暗点，蒸发行星的气云掩盖或从轨道轨道的铁管产生的通量管中加热。 我们介绍了GD 394的过渡系外行星调查卫星（TESS）获得的观察结果。基于空间的光学光度显示出$ 0.12 \ pm0.01 $％的通量变化，售价为$ 1.146 \ pm 0.001 $ d，与EUVE时期一致，与EUVE时期一致，并且在EUVE时期一致，并且在Flas flux varrifiation and Flas frol of Flase varripiation termelfort Offertifial of Flas varripialiation of Flas varripialiation。我们描述了苔丝光曲线的分析和光学变化的测量，并讨论了我们结果对GD 394变异性的各种物理解释的含义。
Recent discoveries have demonstrated that planetary systems routinely survive the post-main sequence evolution of their host stars, leaving the resulting white dwarf with a rich circumsteller environment. Among the most intriguing of such hosts is the hot white dwarf GD 394, exhibiting a unique $1.150\pm0.003$ d flux variation detected in Extreme Ultraviolet Explorer (EUVE) observations in the mid 1990s. The variation has eluded a satisfactory explanation, but hypotheses include channeled accretion producing a dark spot of metals, occultation by a gas cloud from an evaporating planet, or heating from a flux tube produced by an orbiting iron-cored planetesimal. We present observations obtained with the Transiting Exoplanet Survey Satellite (TESS) of GD 394. The space-based optical photometry demonstrates a $0.12\pm0.01$ % flux variation with a period of $1.146\pm 0.001$ d, consistent with the EUVE period and the first re-detection of the flux variation outside of the extreme ultraviolet. We describe the analysis of the TESS light curve and measurement of the optical variation, and discuss the implications of our results for the various physical explanations put forward for the variability of GD 394.
