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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

베타 픽토리스 시스템에서 확인된 두 종류의 서로 다른 외부 혜성

Two families of exocomets in the b Pictoris system
  • 작성자 : KASI
  • 작성일 : 2014-10-24
  • 조회수 : 3384
  • 저자F. Kiefer, A. Lecavelier des Etangs, et al.
  • Absract

     

     

    The young planetary systemsurrounding the star bPictoris harbours active minor bodies. These asteroids and comets produce a large amount of dust and gas through collisions and evaporation, as happened early in the history of our Solar System. Spectroscopic observations of b Pictoris reveal a high rate of transits ofsmall evaporating bodies8–11, that is, exocomets. Here we report an analysis of more than 1,000 archival spectra gathered between 2003 and 2011, which provides a sample of about 6,000 variable absorption signatures arising from exocomets transiting the disk of the parent star. Statistical analysis of the observed properties of these exocomets allows us to identify two populations with different physicalproperties.One family consists of exocomets producing shallow absorption lines, which can be attributed to old exhausted (that is, strongly depleted in volatiles) comets trapped in a mean motion resonance with a massive planet.Another family consists of exocometsproducingdeep absorption lines, whichmay be related to the recent fragmentation of one or a few parent bodies. Our results show that the evaporating bodies observed for decades in the b Pictoris system are analogous to the comets in our own Solar System.​


  • 게재정보NATURE(2014.10.23)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v514/n7523/full/nature13849.html
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