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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

행성계 코어의 내부 이동을 방지하는 행성의 가열 현상

Planet heating prevents inward migration of planetary cores
  • 작성자 : KASI
  • 작성일 : 2015-04-08
  • 조회수 : 2310
  • 저자Pablo Benı´tez-Llambay, Fre´de´ric Masset et al.,
  • Absract

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    Planetary systems are born in the disks of gas, dust and rocky fragments that surround newly formed stars. Solid content assembles into ever-larger rocky fragments that eventually become planetary embryos. These then continue their growth by accreting leftover material in the disk. Concurrently, tidal effects in the disk cause a radial drift in the embryo orbits, a process known as migration. Fast inward migration is predicted by theory for embryos smaller than three to fiveEarthmasses. With only inwardmigration, these embryos can only rarely become giant planets located at Earth’s distance fromthe Sunand beyond, incontrastwith observations. Here we report that asymmetries in the temperature rise associated with accreting infalling material produce a force (which gives rise to an effect thatwe call ‘heating torque’) that counteracts inward migration.This provides a channel for the formation of giantplanets and also explains the strong planet correlation found between the incidence of giant planets and the heavy-element abundance of the host stars.


  • 게재정보NATURE(2015.04.02)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v520/n7545/pdf/nature14277.pdf
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