The exoplanet candidate around the white dwarf WD 1856+534 is of special interest for exoplanet atmosphere characterization because of its very cool temperature and potentially large spectral signal in transmission spectroscopy. Here we present ground-based transit follow-up to verify the transit depth and refine the orbital ephemeris allowing for a more accurate scheduling of future transit observations. Our new ephemeris provides transit time predictions with an uncertainty of less than 30s until the year 2030.

中文翻译：

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围绕白矮星WD1856 + 534的系外行星候选星历的细化

白矮星WD 1856 + 534周围的系外行星候选者对于系外行星大气特征特别感兴趣，因为它的温度非常低，并且在透射光谱学中可能有很大的光谱信号。在这里，我们提出了地面过境跟踪措施，以验证过境深度并完善轨道星历表，从而可以更准确地安排未来的过境观测。我们的新星历提供了到2030年的过渡时间预测，不确定性不到30秒。