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首页> 外文期刊>The Astrophysical Journal. Supplement Series >Discovery and atmospheric characterization of giant planet Kepler-12b: An inflated radius outlier
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Discovery and atmospheric characterization of giant planet Kepler-12b: An inflated radius outlier

机译：巨型行星开普勒-12B的发现和大气表征：膨胀半径异常

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摘要

We report the discovery of planet Kepler-12b (KOI-20), which at 1.695 ± 0.030 R_J is among the handful of planets with super-inflated radii above 1.65 R_J. Orbiting its slightly evolved G0 host with a 4.438 day period, this 0.431 ± 0.041 M_J planet is the least irradiated within this largest-planet-radius group, which has important implications for planetary physics. The planet's inflated radius and low mass lead to a very low density of 0.111 ± 0.010gcm~(-3). We detect the occultation of the planet at a significance of 3.7σ in the Kepler bandpass. This yields a geometric albedo of 0.14 ± 0.04; the planetary flux is due to a combination of scattered light and emitted thermal flux. We use multiple observations with Warm Spitzer to detect the occultation at 7σ and 4σ in the 3.6 and 4.5 μm bandpasses, respectively. The occultation photometry timing is consistent with a circular orbit at e < 0.01 (1σ) and e < 0.09 (3σ). The occultation detections across the three bands favor an atmospheric model with no dayside temperature inversion. The Kepler occultation detection provides significant leverage, but conclusions regarding temperature structure are preliminary, given our ignorance of opacity sources at optical wavelengths in hot Jupiter atmospheres. If Kepler-12b and HD 209458b, which intercept similar incident stellar fluxes, have the same heavy-element masses, the interior energy source needed to explain the large radius of Kepler-12b is three times larger than that of HD 209458b. This may suggest that more than one radius-inflation mechanism is at work for Kepler-12b or that it is less heavy-element rich than other transiting planets.
机译：我们报告了行星开普勒-12b（koi-20）的发现，它在1.695±0.030 r_j是一个具有超膨胀半径的行星之一以上1.65 r_j。轨道略微进化的G0主机，具有4.438天的时间，这一值为0.431±0.041 M_J星球，这一最大的行星半径组最少地辐照，这对行星物理有重要意义。地球的膨胀半径和低质量导致低密度为0.111±0.010gcm〜（-3）。我们在电磁带通道中的3.7σ中检测到行星的暗方。这产生0.14±0.04的几何反照;行星磁通量是由于散射光和发射的热通量的组合。我们使用暖棉醉机使用多种观察，分别在3.6和4.5μm带通中检测7σ和4σ的掩星。掩星光度测量正时与E <0.01（1σ）和E <0.09（3σ）的圆形轨道一致。三个带域的掩星探测有利于大气模型，没有天杜温度反转。雷普勒掩星检测提供了显着的杠杆，但是对于温度结构的结论是初步的，因为我们对热木星大气中的光学波长在光学波长下的无透明源无知。如果截止相似的入射型散丝通量的电孔-12b和HD 209458b具有相同的重元质量，则解释大半径的内部能量源-12b所需的内部能量源比HD 209458B的大半径为三倍。这可能表明，对于开普勒-12B的工作，或者它比其他过渡行星更富有重厚度的富含重量的半径通胀机制。

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    Fortney J.J.; Demory B.-O.; Désert J.-M.; Rowe J.; Marcy G.W.; Isaacson H.; Buchhave L.A.; Ciardi D.; Gautier T.N.; Batalha N.M.; Caldwell D.A.; Bryson S.T.; Nutzman P.; Jenkins J.M.; Howard A.; Charbonneau D.; Knutson H.A.; Howell S.B.; Everett M.; Fressin F.; Deming D.; Borucki W.J.; Brown T.M.; Ford E.B.; Gilliland R.L.;

  • 作者单位

    Department of Astronomy and Astrophysics University of California Santa Cruz CA 95064 United States;

    Massachusetts Institute of Technology Cambridge MA 02139 United States;

    Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138 United States;

    SETI Institute NASA Ames Research Center Moffett Field CA 94035 United States;

    Department of Astronomy University of California Berkeley CA 94720-3411 United States;

    Department of Astronomy University of California Berkeley CA 94720-3411 United States;

    Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138 United States;

    NASA Exoplanet Science Institute Caltech MS 100-22 770 South Wilson Avenue Pasadena CA 91125 United States;

    Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109 United States;

    Department of Physics and Astronomy San Jose State University San Jose CA 95192 United States;

    SETI Institute NASA Ames Research Center Moffett Field CA 94035 United States;

    NASA Ames Research Center Moffett Field CA 94035 United States;

    Department of Astronomy and Astrophysics University of California Santa Cruz CA 95064 United States;

    SETI Institute NASA Ames Research Center Moffett Field CA 94035 United States;

    Department of Astronomy University of California Berkeley CA 94720-3411 United States;

    Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138 United States;

    Department of Astronomy University of California Berkeley CA 94720-3411 United States;

    NASA Ames Research Center Moffett Field CA 94035 United States;

    National Optical Astronomy Observatories Tucson AZ 85719 United States;

    Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138 United States;

    Department of Astronomy University of Maryland at College Park College Park MD 20742 United States;

    NASA Ames Research Center Moffett Field CA 94035 United States;

    Las Cumbres Observatory Global Telescope Goleta CA 93117 United States;

    Department of Astronomy University of Florida Gainesville FL 32611 United States;

    Space Telescope Science Institute Baltimore MD 21218 United States;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天体物理学;
  • 关键词

    planets and satellites: atmospheres; stars: individual (Kepler-12; KOI-20; KIC 11804465); techniques: spectroscopic;

    机译：行星和卫星：大气;星：个人（Keper-12;Koi-20;Kic 11804465）;技术：光谱;

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