Improving the prospects for detecting extrasolar planets in gravitational microlensing events in 2002
Improving the prospects for detecting extrasolar planets in gravitational microlensing events in 2002
复制标题
改善2002年引力微透镜事件中探测太阳系外行星的前景
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
P. Yock
中科院分区：
文献类型：
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作者：
I. Bond;I. Bond;F. Abe;R. Dodd;R. Dodd;J. Hearnshaw;P. Kilmartin;P. Kilmartin;K. Masuda;Y. Matsubara;Yasushi Muraki;S. Noda;O. Petterson;N. Rattenbury;M. Reid;T. Saito;Y. Saito;T. Sako;J. Skuljan;D. Sullivan;T. Sumi;S. Wilkinson;R. Yamada;T. Yanagisawa;P. Yock
高放大率的引力微透镜事件已被证明是探测太阳系外行星的有希望的目标。然而，只有少数事件的高放大率已发现使用传统的调查技术。在这里，我们表明，高放大倍数的事件可以很容易地发现在微透镜调查使用的策略，结合高频采样的目标领域与在线差异成像分析。我们提出了10个微透镜事件的峰值放大率大于40，在2001年期间，在实时检测到对银河系的膨胀的天体物理学（MOA）项目的微透镜观测。我们表明，地球质量的行星可以在未来的事件，如通过密集的后续观测周围的事件高峰检测到这些。我们紧急报告这一结果，因为预计2002年将发生类似数量的此类事件。
Gravitational microlensing events of high magnification have been shown to be promising targets for detecting extrasolar planets. However, only a few events of high magnification have been found using conventional survey techniques. Here we demonstrate that high-magnification events can be readily found in microlensing surveys using a strategy that combines high-frequency sampling of target fields with on-line difference imaging analysis. We present 10 microlensing events with peak magnifications greater than 40 that were detected in real-time towards the Galactic bulge during 2001 by the Microlensing Observations in Astrophysics (MOA) project. We show that Earth-mass planets can be detected in future events such as these through intensive follow-up observations around the event peaks. We report this result with urgency as a similar number of such events are expected in 2002.