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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

젊은 저질량 다중 은하계 시스템인 GGTauA에서의 행성 생성 가능성

Possible planet formation in the young, low-mass, multiple stellar system GG Tau A
  • 작성자 : KASI
  • 작성일 : 2014-11-03
  • 조회수 : 3315
  • 저자Anne Dutrey, Emmanuel Di Folco et al.
  • Absract

     

    The formation of planets around binary stars may be more difficult than around single stars. In a close binary star (with a separation of less than a hundred astronomical units), theory predicts the presence of circumstellar disks around each star, and an outer circumbinary disk surrounding a gravitationally cleared inner cavity around the stars. Given that the inner disks are depleted by accretion onto the starsontimescalesof a fewthousand years, any replenishing material must be transferred from the outer reservoir to fuel planet formation (which occurs on timescales of about one million years). Gas flowing through disk cavities has beendetectedinsingle star systems. A circumbinary disk was discovered around the young low-mass binary systemGGTauA, which has recently been shownto be a hierarchical triple system. It has one large inner disk around the single star,GGTau Aa, and shows small amounts of shocked hydrogen gas residing within the central cavity, but other than a single weak detection, the distribution of cold gas in this cavity or in any other binary ormultiple star systemhas not hitherto beendetermined.Here we report imaging of gas fragments emitting radiation characteristic of carbon monoxide within theGGTauAcavity. Fromthe kinematics we conclude that the flow appears capable of sustaining the inner disk (around GG Tau Aa) beyond the accretion lifetime, leaving time for planet formation to occur there. These results show the complexity of planet formation around multiple stars and confirm the general picture predicted by numerical simulations.


  • 게재정보NATURE(2014.10.30)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v514/n7524/pdf/nature13822.pdf
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