Design Considerations for a Ground-based Search for Transiting Planets around L and T Dwarfs
Design Considerations for a Ground-based Search for Transiting Planets around L and T Dwarfs
复制标题
L 型矮星和 T 型矮星周围凌日行星地面搜索的设计考虑
DOI：
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发表时间：
2019
影响因子：
3.5
通讯作者：
P. Muirhead
中科院分区：
文献类型：
--
作者：
P. Tamburo;P. Muirhead
我们提出了对 L 矮星和 T 矮星周围凌日系外行星进行地面调查的设计考虑因素，这些光谱类别尚未对行星进行彻底探测。我们使用各种红光和近红外 (NIR) 探测器模拟 L 和 T 目标的光度测定，并将光度测定中的散射与预期的传输深度进行比较。根据这些结果，我们建议使用具有 H 波段近红外光度测量功能的低暗电流探测器。然后，我们研究了使用各种尺寸的望远镜对地球大小的行星进行调查的可能性。我们使用开普勒测量的 M 矮行星发生率来模拟一组经光谱证实的 L 和 T 矮星周围的行星系统，并在持续时间从 120 到 600 个夜晚的调查中模拟它们的观测，随机丢弃 30% 的夜晚来模拟天气损失。我们发现，有效的勘测设计使用带有近红外仪器的 2 m 级望远镜和 360-480 个观测夜，每晚使用抖动策略观测多个 L 和 T 目标。以这种方式进行的勘测有超过 80% 的机会探测到至少一颗行星，平均探测到大约 2 颗行星。然而，预期探测到的数量取决于真实的行星出现率，事实上，L 矮星和 T 矮星的行星出现率可能高于 M 矮星。
We present design considerations for a ground-based survey for transiting exoplanets around L and T dwarfs, spectral classes that have yet to be thoroughly probed for planets. We simulate photometry for L and T targets with a variety of red-optical and near-infrared (NIR) detectors, and compare the scatter in the photometry to anticipated transit depths. Based on these results, we recommend the use of a low-dark-current detector with H-band NIR photometric capabilities. We then investigate the potential for performing a survey for Earth-sized planets for a variety of telescope sizes. We simulate planetary systems around a set of spectroscopically confirmed L and T dwarfs using measured M dwarf planet occurrence rates from Kepler, and simulate their observation in surveys ranging in duration from 120 to 600 nights, randomly discarding 30% of nights to simulate weather losses. We find that an efficient survey design uses a 2 m class telescope with a NIR instrument and 360–480 observing nights, observing multiple L and T targets each night with a dithering strategy. Surveys conducted in such a manner have over an 80% chance of detecting at least one planet, and detect around 2 planets, on average. The number of expected detections depends on the true planet occurrence rate, however, which may in fact be higher for L and T dwarfs than for M dwarfs.
限制最冷褐矮星的多重性统计：二元分数随着光谱类型继续减少
影响因子：
4.8
作者：
Fontanive C
通讯作者：
Fontanive C
DOI：
10.1093/mnrasl/slz039
发表时间：
2019-02
影响因子：
--
作者：
J. Jackman;P. Wheatley;D. Bayliss;M. Burleigh;S. Casewell;P. Eigmüller;M. Goad;D. Pollacco;
通讯作者：
J. Jackman;P. Wheatley;D. Bayliss;M. Burleigh;S. Casewell;P. Eigmüller;M. Goad;D. Pollacco;
影响因子：
6.5
作者：
Baraffe, Isabelle;Homeier, Derek;Chabrier, Gilles
通讯作者：
Chabrier, Gilles