论文标题
TOI-1259b的光谱 - 未污染的白矮人伴侣，膨胀温暖的土星
Spectroscopy of TOI-1259B -- an unpolluted white dwarf companion to an inflated warm Saturn
论文作者
论文摘要
TOI-1259由一个旋转的主要序列星的过境系外行星组成，并具有结合的外部白色矮人伴侣。已知使用此体系结构的少于十二个系统。我们使用大型双眼望远镜（LBT）对白矮人TOI-1259B进行后续光谱法，以更好地表征它。我们只观察到强大的氢系，使TOI-1259B成为Da White Dwarf。我们没有看到重元污染的证据，这本来是白矮人周围行星材料的证据。在〜25-50％的白矮人中可以看到这种污染，但是在包含已知行星的TOI-1259样系统中，该速率是否较高或更低。我们的光谱允许改进的白色矮人年龄测量为4.05（+1.00 -0.42）Gyrs，与主序列星的陀螺仪相匹配。这是扩展的类似二进制文件的第一个样本中的第一个，它将允许我们校准这些约会方法，并为二进制行星提供新的视角。
TOI-1259 consists of a transiting exoplanet orbiting a main sequence star, with a bound outer white dwarf companion. Less than a dozen systems with this architecture are known. We conduct follow-up spectroscopy on the white dwarf TOI-1259B using the Large Binocular Telescope (LBT) to better characterise it. We observe only strong hydrogen lines, making TOI-1259B a DA white dwarf. We see no evidence of heavy element pollution, which would have been evidence of planetary material around the white dwarf. Such pollution is seen in ~ 25 - 50% of white dwarfs, but it is unknown if this rate is higher or lower in TOI-1259-like systems that contain a known planet. Our spectroscopy permits an improved white dwarf age measurement of 4.05 (+1.00 -0.42) Gyrs, which matches gyrochronology of the main sequence star. This is the first of an expanded sample of similar binaries that will allow us to calibrate these dating methods and provide a new perspective on planets in binaries.
