首页> 外文期刊>The Astrophysical journal >ORBITAL PERTURBATIONS OF TRANSITING PLANETS: A POSSIBLE METHOD TO MEASURE STELLAR QUADRUPOLES AND TO DETECT EARTH-MASS PLANETS
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ORBITAL PERTURBATIONS OF TRANSITING PLANETS: A POSSIBLE METHOD TO MEASURE STELLAR QUADRUPOLES AND TO DETECT EARTH-MASS PLANETS

机译:过渡行星的轨道扰动:一种测量恒星四极并探测地球质量行星的可能方法

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摘要

The recent discovery of a planetary transit in the star HD 209458, and the subsequent highly precise observation of the transit light curve with Hubble Space Telescope, is encouraging to search for any phenomena that might induce small changes in the light curve. Here we consider the effect of the quadru-pole moment of the parent star and of a possible second planet perturbing the orbit of the transiting planet. Both of these cause a precession of the orbital plane and of the periastron of the planet, which result in a long-term variation of the duration and the period of the transit. For a transiting planet at 0.05 AU, either a quadrupole moment similar to that of the Sun or the gravitational tug from an Earth-like planet on an orbit of semimajor axis ~0.2 AU and a relative inclination near the optimal 45° would cause a transit duration time derivative of ~1 s yr~(-1).
机译:最近在HD 209458恒星中发现了行星过渡,并随后用哈勃太空望远镜对过渡光曲线进行了高度精确的观测,这鼓励寻找任何可能引起光曲线微小变化的现象。在这里,我们考虑了母星的四极矩的影响以及第二颗可能扰动过渡行星轨道的行星的影响。这两者都会导致轨道平面和行星周星运动的进动,从而导致运输持续时间和周期的长期变化。对于处于0.05 AU处的过渡行星,与太阳类似的四极矩或半长轴〜0.2 AU轨道上的类地球行星的引力拖曳以及相对于最佳45°的相对倾角都会引起过渡持续时间〜1 s yr〜(-1)。

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