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arXiv 0902.3457astro-ph.EP
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柯伊伯带天体掩星:预期率、假阳性和巡天设计

Kuiper Belt Object Occultations: Expected Rates, False Positives, and Survey Design

Steven Bickerton, Doug Welch, JJ Kavelaars

摘要:

提出了一种新的人工闪烁噪声产生方法,并用于估算柯伊伯带偶然掩星探测的掩星率和假阳性率。对调查设计的彻底审查表明:(1)衍射主导的掩星以2 Fsu^{-1}的速率进行临界(奈奎斯特)采样,对应于40天文单位处的物体的40 s^{-1},(2)当目标在太阳对立面被观测时,掩星探测率最大化,(3)如果观测到的目标恒星的太阳伸长率为:116度<θ < 125度,或131度<θ < 141度,以及(4)真正的KBO掩星可能非常罕见,因此应该采用>7-8 σ的检测阈值,以确保可行的候选事件可以从假阳性中分离出来。

英文摘要:

A novel method of generating artificial scintillation noise is developed and used to evaluate occultation rates and false positive rates for surveys probing the Kuiper Belt with the method of serendipitous stellar occultations. A thorough examination of survey design shows that: (1) diffraction-dominated occultations are critically (Nyquist) sampled at a rate of 2 Fsu^{-1}, corresponding to 40 s^{-1} for objects at 40 AU, (2) occultation detection rates are maximized when targets are observed at solar opposition, (3) Main Belt Asteroids will produce occultations lightcurves identical to those of Kuiper Belt Objects if target stars are observed at solar elongations of: 116 deg < epsilon < 125 deg, or 131 deg < epsilon < 141 deg, and (4) genuine KBO occultations are likely to be so rare that a detection threshold of >7-8 sigma should be adopted to ensure that viable candidate events can be disentangled from false positives.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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