On the detectability of transiting planets orbiting white dwarfs using LSST

On the detectability of transiting planets orbiting white dwarfs using LSST
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利用 LSST 探测围绕白矮星运行的凌日行星

DOI:
10.1093/mnras/stz1300
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发表时间:
2019
影响因子:
4.8
通讯作者:
Kipping, David
Kipping, David
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cortés, Jorge;Kipping, David

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白矮星是为数不多的几种我们尚未确认是否存在伴星的恒星天体之一。最近有证据表明,金属污染的大气层、恒星周围的碎片圆盘和凌日的行星碎片都表明,行星很可能存在。然而,由于白矮星凌日的内在模糊性、凌日的短时间尺度以及由于其紧凑的半径而导致的较低的凌日概率,对白矮星凌日的调查是具有挑战性的。大型天文观测望远镜(LSST)提供了一种解决这些问题的方法,它是一种深度半空观测,快速曝光,覆盖了大约1000万颗视星等(MR)为24.5级的白矮星。我们模拟了350万颗白矮星在10年内的LSST光度观测,并通过凌日计算了P<10 d伴行星的可探测性。我们发现,从谷神星大小的天体到地球大小的星球,典型的探测率在5×10−6到4×10−4的范围内,每个天体的∼50检测的出现率为100% 。对于连续宜居带中的类地行星,我们发现的探测率为∼10−3,这表明LSST将揭示数百个这样的行星,其出现率在1-10%/ 的范围内。
White dwarfs are one of the few types of stellar object for which we have yet to confirm the existence of companion planets. Recent evidence for metal contaminated atmospheres, circumstellar debris discs, and transiting planetary debris all indicates that planets may be likely. However, white dwarf transit surveys are challenging due to the intrinsic faintness of such objects, the short time-scale of the transits, and the low transit probabilities due to their compact radii. The Large Synoptic Survey Telescope (LSST) offers a remedy to these problems as a deep, half-sky survey with fast exposures encompassing approximately 10 million white dwarfs withr< 24.5 apparent magnitude (mr). We simulate LSST photometric observations of 3.5 million white dwarfs over a 10 yr period and calculate the detectability of companion planets withP< 10 d via transits. We find typical detection rates in the range of 5 × 10−6to 4 × 10−4for Ceres-sized bodies to Earth-sized worlds, yielding ∼50–detections for a 100 per cent occurrence rate of each. For terrestrial planets in the continuously habitable zone, we find detection rates of ∼10−3indicating that LSST would reveal hundreds of such worlds for occurrence rates in the range of 1–10 per cent.
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发表时间: 2017
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发表时间: 2016
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DOI: --
发表时间: 2014
期刊: Astronomical Telescopes and Instrumentation
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DOI: 10.1086/340452
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期刊: The Astrophysical Journal
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