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The signature of orbital motion from the dayside of the planet τ Booetis b

机译：从行星τBooetis b开始的轨道运动的特征

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摘要

The giant planet orbiting z Bootis (named t Booetis b) was amongst the first extrasolar planets to be discovered. It is one of the brightest exoplanets and one of the nearest to us, with an orbital period of just a few days. Over the course of more than a decade, measurements of its orbital inclination have been announced and refuted, and have hitherto remained elusive. Here we report the detection of carbon monoxide absorption in the thermal dayside spectrum ofτt Booetis b. At a spectral resolution of ～100,000, we trace the change in the radial velocity of the planet over a large range in phase, determining an orbital inclination of 44.5° ±1.5° and a mass 5.95 ± 0.28 times that of Jupiter, demonstrating that atmospheric characterization is possible for non-transiting planets. The strong absorption signal points to an atmosphere with a temperature that is decreasing towards higher altitudes, in contrast to the temperature inversion inferred for other highly irradiated planets. This supports the hypothesis that the absorbing compounds believed to cause such atmospheric inversions are destroyed in τ Bootis b by the ultraviolet emission from the active host star.
机译：绕着z Bootis的巨型行星（名为t Booetis b）是最早发现的太阳系外行星之一。它是最明亮的系外行星之一，也是离我们最近的系外行星之一，轨道周期只有几天。在十多年的过程中，已经宣布并驳斥了其轨道倾角的测量方法，并且至今仍难以捉摸。在这里，我们报告在Bottis b的热日光谱中检测到一氧化碳吸收。在约100,000的光谱分辨率下，我们追踪了行星的径向速度在较大相位范围内的变化，确定了44.5°±1.5°的轨道倾角和质量为木星的5.95±0.28倍，证明了大气非过渡行星的表征是可能的。与其他高辐射行星推断的温度反转相反，强吸收信号指向大气层的温度朝着更高的高度降低。这支持了这样的假说：被认为会引起这种大气倒转的吸收性化合物会被来自活性主星的紫外线发射在τBootis b中破坏。

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  • 来源
    《Nature》 |2012年第7404期|p.502-504|共3页
  • 作者

    Matteo Brogi; Ignas A. G. Snellen; Remco J. de Kok; Simon Albrecht; Jayne Birkby; Ernst J. W. de Mooij;

  • 作者单位

    Leiden Observatory, Leiden University, Postbus 9513, 2300RA Leiden, The Netherlands;

    Leiden Observatory, Leiden University, Postbus 9513, 2300RA Leiden, The Netherlands;

    SR0N, Sorbonnelaan 2,3584 CA Utrecht, The Netherlands;

    Department of Physics, and Kavli Institute for Astrophysicsand Space Research, Massachusetts Institute of Technology, Cambridge, Massachuse tts 02139, USA;

    Leiden Observatory, Leiden University, Postbus 9513, 2300RA Leiden, The Netherlands;

    Leiden Observatory, Leiden University, Postbus 9513, 2300RA Leiden, The Netherlands,Department of Astronomy and Astrophysics, University of Toronto, 50 St George Street, Toronto, Ontario M5S 3H4, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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