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뜨거운 목성형 태양계 외부 행성의 스펙트럼 분석

A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
  • 작성자 : KASI
  • 작성일 : 2016-01-18
  • 조회수 : 2207
  • 저자David K. Sing, Jonathan J. Fortney, Nikolay Nikolov et al.,
  • Absract

    Thousands of transiting exoplanets have been discovered, but spectral analysis of their atmospheres has so far been dominated by a small number of exoplanets and data spanning relatively narrow wavelength ranges (such as 1.1–1.7 micrometres). Recent studies show that some hot-Jupiter exoplanets have much weaker water absorption features in their near-infrared spectra than predicted. The low amplitude of water signatures could be explained by very low water abundances, which may be a sign that water was depleted in the protoplanetary disk at the planet’s formation location, but it is unclear whether this level of depletion can actually occur. Alternatively, these weak signals could be the result of obscuration by clouds or hazes, as found in some optical spectra. Here we report results from a comparative study of ten hot Jupiters covering the wavelength range 0.3–5 micrometres, which allows us to resolve both the optical scattering and infrared molecular absorption spectroscopically. Our results reveal a diverse group of hot Jupiters that exhibit a continuum from clear to cloudy atmospheres. We find that the difference between the planetary radius measured at optical and infrared wavelengths is an effective metric for distinguishing different atmosphere types. The difference correlates with the spectral strength of water, so that strong water absorption lines are seen in clear-atmosphere planets and the weakest features are associated with clouds and hazes. This result strongly suggests that primordial water depletion during formation is unlikely and that clouds and hazes are the cause of weaker spectral signatures.


  • 게재정보NATURE(2016.01.07.)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v529/n7584/pdf/nature16068.pdf
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