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    188宝金博页面版: 【精品】ANewPupilforDetectingExtrasolarPlanets

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    内容提示： arXiv:astro-ph/0101142v1 9 Jan 2001A New Pupil for Detecting Extrasolar PlanetsD. N. SpergelDepartment of Astrophysical Science, Princeton University,Princeton, NJ 08544Institute for Advanced Study, Princeton, NJ 08540dns@astro.princeton.eduThe challenge for optical detection of terrestial planet is the 25 magnitude brightnesscontrast between the planet and its host star. This paper introduces a new pupil designthat produces a very dark null along its symmetry axis. By changing the shape of thepupil, we c...

    文档格式：PDF | 页数：14 | 浏览次数：91 | 上传日期：2013-11-02 11:31:04 | 文档星级：
    arXiv:astro-ph/0101142v1 9 Jan 2001A New Pupil for Detecting Extrasolar PlanetsD. N. SpergelDepartment of Astrophysical Science, Princeton University,Princeton, NJ 08544Institute for Advanced Study, Princeton, NJ 08540dns@astro.princeton.eduThe challenge for optical detection of terrestial planet is the 25 magnitude brightnesscontrast between the planet and its host star. This paper introduces a new pupil designthat produces a very dark null along its symmetry axis. By changing the shape of thepupil, we can control the depth and location of this null. This null can be further enhancedby combining this pupil with a rooftop nuller or cateye nuller and an aperture stop. Theperformance of the optical system will be limited by imperfections in the mirror surface. Ifthe star is imaged with and without the nuller, then we can characterize these imperfectionsand then correct them with a deformable mirror. The full optical system when deployed ona 6 × 10 m space telescope is capable of detecting Earthlike planets around stars within20 parsecs. For an Earthlike planet around a nearby stars (10 parsecs), the telescope cancharacterize its atmosphere by measuring spectral lines in the 0.3 - 1.3 micron range. c 2008 Optical Society of AmericaSubmitted to Applied Optics1.IntroductionThe detection and characterization of Earthlike planets is one of a NASA’s highest priorities for the comingyears. Currently, NASA’s plans focus on building large mid-infrared nulling interferometers that aim todetect thermal emission from planets and characterize the absorbtion lines in their atmosphere[1]. There isan alternative approach: a large optical telescope with a suitable coronagraph may be capable of detecting1

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