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A high C/O ratio and weak thermal inversion in the atmosphere of exoplanet WASP-12b

机译:WASP-12b系外行星大气中的高C / O比和较弱的热转化

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摘要

The carbon-to-oxygen ratio (C/O) in a planet provides critical information about its primordial origins and subsequent evolution. A primordial C/O greater than 0.8 causes a carbide-dominated interior, as opposed to the silicate-dominated composition found on Earth; the atmosphere can also differ from those in the Solar System. The solar C/O is 0.54 (ref. 3). Here we report an analysis of dayside multi-wavelength photometry of the transiting hot-Jupiter WASP-12b (ref. 6) that reveals C/O ≥ 1 in its atmosphere. The atmosphere is abundant in CO. It is depleted in water vapour and enhanced in methane, each by more than two orders of mag-nitude compared to a solar-abundance chemical-equilibrium model at the expected temperatures. We also find that the extremely irra-diated atmosphere (T> 2,500 K) of WASP-12b lacks a prominent thermal inversion (or stratosphere) and has very efficient day-night energy circulation. The absence of a strong thermal inversion is in stark contrast to theoretical predictions for the most highly irra-diated hot-Jupiter atmospheres.
机译:行星中的碳氧比(C / O)提供有关其原始起源和随后演化的重要信息。原始C / O大于0.8会导致内部以碳化物为主,而不是地球上以硅酸盐为主的成分。大气也可能不同于太阳系中的大气。太阳能C / O为0.54(参考3)。在这里,我们报告了对瞬变热木星WASP-12b(参考文献6)的日间多波长光度法的分析,结果表明大气中的C / O≥1。大气中富含CO。与预期的温度下的太阳丰度化学平衡模型相比,大气中的水蒸气被耗尽,甲烷中的甲烷含量增加了两个数量级。我们还发现,WASP-12b的极端过度辐射的大气(T> 2,500 K)缺乏显着的热转化(或平流层),并且具有非常高效的昼夜能量循环。没有强烈的热反演与对高度辐射化的热木星大气的理论预测形成了鲜明的对比。

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  • 来源
    《Nature》 |2011年第7328期|p.64-67|共4页
  • 作者单位

    Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA,Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Department of Physics, University of Warwick, Coventry, CV4 7AL, UK;

    NASA's Goddard Space Flight Center, Greenbelt, Maryland 20771-0001, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK;

    School of Physics and Astronomy, University of St Andrews, North Haugh, Fife KY16 9SS, UK;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA;

    Department of Physicsand Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA;

    Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK;

    Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK;

    Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast, BT7 1NN, UK;

    Department of Physics and Astronomy, University of Leicester, Leicester,LE1 7RH, UK;

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