首页> 外文期刊>Nature >A ground-based near-infrared emission spectrum of the exoplanet HD 189733b
【24h】

A ground-based near-infrared emission spectrum of the exoplanet HD 189733b

机译:系外行星HD 189733b的地基近红外发射光谱

获取原文
获取原文并翻译 | 示例
           

摘要

Detection of molecules using infrared spectroscopy probes the conditions and compositions of exoplanet atmospheres. Water (H_2O), methane (CH_4), carbon dioxide (CO_2), and carbon monoxide (CO) have been detected in two hot Jupiters. These previous results relied on space-based telescopes that do not provide spectroscopic capability in the 2.4-5.2 μm spectral region. Here we report ground-based observations of the dayside emission spectrum for HD 189733b between 2.0-2.4 μm and 3.1-4.1 μm, where we find a bright emission feature. Where overlap with space-based instruments exists, our results are in excellent agreement with previous measurements. A feature at ~3.25 μm is unexpected and difficult to explain with models that assume local thermodynamic equilibrium (LTE) conditions at the 1 bar to 1 × 10~(-6) bar pressures typically sampled by infrared measurements. The most likely explanation for this feature is that it arises from non-LTE emission from CH_4, similar to what is seen in the atmospheres of planets in our own Solar System. These results suggest that non-LTE effects may need to be considered when interpreting measurements of strongly irradiated exoplanets.
机译:使用红外光谱检测分子可以探测系外行星大气的条件和组成。在两个热木星中检测到水(H_2O),甲烷(CH_4),二氧化碳(CO_2)和一氧化碳(CO)。这些先前的结果依赖于在2.4-5.2μm光谱范围内不提供光谱功能的天基望远镜。在这里,我们报告了HD 189733b在2.0-2.4μm和3.1-4.1μm之间的日间发射光谱的地面观测结果,发现了明亮的发射特征。与天基仪器存在重叠的地方,我们的结果与以前的测量非常吻合。 〜3.25μm处的特征是出乎意料的,并且难以用模型来解释,这些模型假设在通常通过红外测量采样的1 bar至1×10〜(-6)bar压力下的局部热力学平衡(LTE)条件。此功能最可能的解释是,它来自CH_4的非LTE发射,类似于在我们自己的太阳系中的行星大气中看到的情况。这些结果表明,在解释强辐射系外行星的测量值时可能需要考虑非LTE效应。

著录项

  • 来源
    《Nature》 |2010年第7281期|637-639|共3页
  • 作者单位

    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA;

    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA;

    University of Arizona, Lunar and Planetary Laboratory, Space Science Building Room 525, 1629 East University Boulevard, Tucson, Arizona 85721, USA;

    Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT, London, UK;

    Woodruff School of Mechanical Engineering, MRDC Building, Room 4111, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, USA;

    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA;

    Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA;

    Max-Planck institute for Astronomy, Koenigstuhl 17, D-69117, Heidelberg, Germany;

    Astronomy Department UCLA, 475 Portola Plaza, Los Angeles, California 90034, USA;

    German SOFIA Institute, Institute for Space Systems, Pfaffenwaldring 3170569, Stuttgart, Germany;

    Max-Planck institute for Astronomy, Koenigstuhl 17, D-69117, Heidelberg, Germany;

    Max-Planck institute for Astronomy, Koenigstuhl 17, D-69117, Heidelberg, Germany;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号