Wide‐Field Millimagnitude Photometry with the HAT: A Tool for Extrasolar Planet Detection
Wide‐Field Millimagnitude Photometry with the HAT: A Tool for Extrasolar Planet Detection
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DOI：
10.1086/382735
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发表时间：
2004-01
影响因子：
3.5
通讯作者：
G. Bakos;G. Bakos;R. Noyes;G. Kovacs;K. Stanek;D. Sasselov;I. Domsa
中科院分区：
文献类型：
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作者：
G. Bakos;G. Bakos;R. Noyes;G. Kovacs;K. Stanek;D. Sasselov;I. Domsa
我们讨论了使用小口径、短焦距望远镜系统在大范围内获得毫米级测光精度的系统要求，例如一些研究小组正在开发的用于搜索凌日太阳系外行星的望远镜系统。我们描述了一个匈牙利自动望远镜(HAT)系统，它试图满足这些要求。通过使望远镜在每次曝光期间执行小的指向步骤，以将系统的有效点扩展函数(PSF)展宽到与我们的CCD探测器的像素尺寸更相容的值，HAT的可达到的精度得到了显著提高。在使用HAT-5仪器对两个恒星场进行初步调查(2003年春季)期间的实验使我们能够使用这种PSF加宽方法优化HAT测光精度；通过这种方法，我们能够在较亮的恒星上获得高达2 mmag的精度。我们简要地描述了一个纵向间隔的帽子望远镜网络(HATNet)的发展。
We discuss the system requirements for obtaining millimagnitude photometric precision over a wide field using small‐aperture, short focal length telescope systems such as those being developed by a number of research groups to search for transiting extrasolar planets. We describe a Hungarian Automated Telescope (HAT) system, which attempts to meet these requirements. The attainable precision of HAT has been significantly improved by a technique in which the telescope is made to execute small pointing steps during each exposure so as to broaden the effective point‐spread function (PSF) of the system to a value more compatible with the pixel size of our CCD detector. Experiments during a preliminary survey (spring 2003) of two star fields with the HAT‐5 instrument allowed us to optimize the HAT photometric precision using this method of PSF broadening; in this way we have been able to achieve a precision as good as 2 mmag on brighter stars. We briefly describe development of a network of longitudinally spaced HAT telescopes (HATNet).