食白矮星-褐矮星双星中唯一的膨胀褐矮星:WD1032+011B

Jenni R. French, Sarah L. Casewell, Rachael C. Amaro, Joshua D. Lothringer, L. C. Mayorga, Stuart P. Littlefair, Ben W. P. Lew, Yifan Zhou, Daniel Apai, Mark S. Marley, Vivien Parmentier, Xianyu Tan
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引用次数: 0

摘要

与行星与恒星通量比更低的热木星相比,白矮星双星中的辐照褐矮星由于轨道周期短、通量比相对较高,为研究辐照大气提供了更好的机会。WD1032+011是一个日食、潮汐锁定的白矮星-褐矮星双星,它有一个9950 K白矮星,与一个69.7M$_{Jup}$褐矮星在0.09天的轨道上环绕运行。我们展示了 WD1032+011 的时间分辨哈勃空间望远镜宽视场相机 3 分光光度数据。我们分离了WD1032+011B的随相位变化的光谱,发现日侧和夜侧的亮度温度相差210 K。该褐矮星的光谱类型被确定为L1奇特型,大气检索结果以及与野外褐矮星的比较都显示了无云大气层的证据。检索到的昼侧温度为 1748^{+66}_{-67}$ K,夜侧温度为 1555^{+76}_{-62}$ K,显示出辐照驱动的温度反差以及从昼侧到夜侧的低效热分布。褐矮星的半径是膨胀的,这可能是由于白矮星的持续辐照造成的,这也是已知的唯一一个白矮星-褐矮星二元黯变中膨胀的褐矮星。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The only inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary: WD1032+011B
Due to their short orbital periods and relatively high flux ratios, irradiated brown dwarfs in binaries with white dwarfs offer better opportunities to study irradiated atmospheres than hot Jupiters, which have lower planet-to-star flux ratios. WD1032+011 is an eclipsing, tidally locked white dwarf-brown dwarf binary with a 9950 K white dwarf orbited by a 69.7 M$_{Jup}$ brown dwarf in a 0.09 day orbit. We present time-resolved Hubble Space Telescope Wide Field Camera 3 spectrophotometric data of WD1032+011. We isolate the phase-dependent spectra of WD1032+011B, finding a 210 K difference in brightness temperature between the dayside and nightside. The spectral type of the brown dwarf is identified as L1 peculiar, with atmospheric retrievals and comparison to field brown dwarfs showing evidence for a cloud-free atmosphere. The retrieved temperature of the dayside is $1748^{+66}_{-67}$ K, with a nightside temperature of $1555^{+76}_{-62}$ K, showing an irradiation-driven temperature contrast coupled with inefficient heat redistribution from the dayside to the nightside. The brown dwarf radius is inflated, likely due to the constant irradiation from the white dwarf, making it the only known inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary.
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