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Inspection and characterization of exoplanet systems using the CHARA Array.

机译：使用CHARA阵列检查和表征系外行星系统。

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摘要

Until the last decade or so, our entire knowledge of planets around Sun-like stars consisted of those in our own Solar System. This is no longer the case. Over 200 planets have been discovered through radial velocity surveys and photometric studies, both of which depend on observing the planet's effects on its host star. Much of our knowledge of the planets orbiting these stars is uncertain, based on assumptions about the stars' masses and the planets' orbital inclinations.;This dissertation is comprised of two main sections. The first involves measuring the angular diameters for a sample of exoplanet host stars using Georgia State University's CHARA Array in order to learn more about the nature of these stars. These direct angular measurements are not dependent on the exoplanet systems' inclinations or the masses of the stars. Improved angular diameters lead to linear diameters when combined with HIPPARCOS parallax measurements, which in turn tell us of the stars' ages and masses. Of the 82 exoplanet systems observable with the CHARA Array, 31 host stars were observed and stellar angular diameters were measured for 26 systems.;In the special case of an exoplanet system with a transiting planet, this direct measurement of the star's angular diameter leads to a direct measurement of the planet's diameter, when the planet-to-star-radii ratio is known from photometric studies. This was done for HD 189733. The star's angular diameter is 0.377 +/- 0.024 mas, which produces a stellar linear radius of 0.779 +/- 0.052 R⊙ and a planetary diameter of 1.19 +/- 0.08 RJupiter.;The second part of this project involved the inspection of the exoplanet systems for stellar companions masquerading as planets. From radial velocity studies alone, it is impossible to distinguish between a planet in a high-inclination orbit and a low-mass stellar companion in a low-inclination orbit. Using the CHARA Array, it was possible to rule out certain secondary spectral types for each exoplanet system observed by studying the errors in the diameter fit and searching for separated fringe packets. While no definitive stellar companions were found, two expolanet systems, v Andromedae and rho Coronae Borealis, exhibited behavior that were not consistent with the host star being a simple limb-darkened disk.;Keywords. Optical/infrared interferometry, exoplanet systems, stellar diameters, stellar companions
机译：直到最后十年左右，我们对类太阳恒星周围的行星的全部知识都是由我们自己的太阳系中的行星组成的。这已不再是这种情况。通过径向速度调查和光度研究已经发现了200多个行星，这两个观测都依赖于观察行星对其宿主恒星的影响。基于对恒星质量和行星轨道倾角的假设，我们对绕这些恒星运行的行星的许多知识尚不确定。;本论文包括两个主要部分。第一个涉及使用佐治亚州立大学的CHARA阵列测量系外行星宿主恒星样本的角直径，以便更多地了解这些恒星的性质。这些直接角度测量值不依赖于系外行星系统的倾角或恒星的质量。当与HIPPARCOS视差测量结合使用时，改进的角直径会导致线性直径，从而告诉我们恒星的年龄和质量。在使用CHARA阵列观测到的82个系外行星系统中，观测到31个主恒星，并测量了26个系统的恒星角直径;在特殊情况下，带有正在运行的行星的系外行星系统，对恒星角直径的直接测量导致当通过光度学研究得知行星与恒星的半径比时，可以直接测量行星的直径。这是为HD 189733完成的。恒星的角直径为0.377 +/- 0.024 mas，产生的恒星线半径为0.779 +/- 0.052 R＆odot；该行星的直径为1.19 +/- 0.08 RJupiter。该项目的第二部分涉及对系外行星系统的检查，以寻找化装为行星的恒星伴星。仅从径向速度研究中，就不可能区分高倾角轨道中的行星和低倾角轨道中的低质量恒星伴星。使用CHARA阵列，可以通过研究直径拟合误差并搜索分离的条纹数据包来排除每个观测到的系外行星系统的某些次级光谱类型。虽然没有发现确定的恒星伴星，但两个expolanet系统v Andromedae和rho Coronae Borealis表现出的行为与宿主恒星为简单的四角暗盘不一致。光学/红外干涉仪，系外行星系统，恒星直径，恒星伴星

著录项

  • 作者

    Baines, Ellyn.;

  • 作者单位

    Georgia State University.;

  • 授予单位 Georgia State University.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 433 p.
  • 总页数 433
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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