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67P/Churyumov-Gerasimenko 헤성의 머리 부위에 풍부하게 존대하는 분자 산소

Abundant molecular oxygen in the coma of comet 67P/Churyumov–Gerasimenko
  • 작성자 : KASI
  • 작성일 : 2015-11-04
  • 조회수 : 2564
  • 저자A. Bieler, K. Altwegg, H. Balsiger et al.,
  • Absract

    The composition of the neutral gas comas of most comets is dominated  byH2O,COandCO2, typically comprising as much as 95 per cent of the total gas density. In addition, com*tary comas have been found to contain a rich array of other molecules, including sulfuric compounds and complex hydrocarbons. Molecular oxygen (O2), however, despite its detection on other icy bodies such as the moons of Jupiter and Saturn, has remained undetected in com*tary comas. Here we report in situ measurement of O2 in the coma of comet 67P/Churyumov–Gerasimenko, with local abundances ranging from one per cent to ten per cent relative to H2O and with a mean value of 3.8060.85 per cent. Our observations indicate that the O2/H2O ratio is isotropic in the coma and does not change systematically with heliocentric distance. This suggests that primordial O2 was incorporated into the nucleus during the comet’s formation, which is unexpected given the low upper limits from  remote sensing observations. Current Solar System formation models do not predict conditions that would allow this to occur.​

     


  • 게재정보NATURE(2015.10.29.)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v526/n7575/pdf/nature15707.pdf
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