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THE MULTIPLE PROTO STELLAR SYSTEM L1551 IRS5 AT 5 AU RESOLUTION
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  • THE MULTIPLE PROTO STELLAR SYSTEM L1551 IRS5 AT 5 AU RESOLUTION
  • THE MULTIPLE PROTO STELLAR SYSTEM L1551 IRS5 AT 5 AU RESOLUTION
저자명
LIM. JEREMY,TAKAKUWA. SHIGEHISA
간행물명
Journal of the Korean astronomical society
권/호정보
2005년|38권 2호|pp.237-240 (4 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

We present images of L1551 IRS5 at angular resolutions as high as ${~}$30 mas, corresponding to a spatial resolution of ${~}$5 AU, made at 7 mm with the VLA. Previously known to be a binary protostellar system, we show that L1551 IRS5 is likely a triple protostellar system. The primary and secondary components have a projected separation of ${~}$46 AU, whereas the tertiary component has a projected separation of ${~}$11 AU from the primary component. The circumstellar dust disks of the primary and secondary components have dimensions of ${~}$15 AU, whereas that of the tertiary component has a dimension of ${~}$10 AU. Their major axes are closely, but not perfectly, aligned with each other, as well as the major axis of the surrounding flattened, rotating, and contracting molecular condensation (pseudodisk). Furthermore, the orbital motion of the primary and secondary components is in the same direction as the rotational motion of this pseudodisk. We suggest that all three protostellar components formed as a result of the fragmentation of the central region of the molecular pseudo disk. The primary and secondary components, but apparently not the tertiary component, each exhibits a bipolar ionized jet that is centered on and which emergers perpendicular to its associated dust disk. Neither jets are resolved along their base, implying that they are driven within a radial distance of ${~}$2.5 AU from their central protostars. Finally, we show evidence for what may be dusty matter streams feeding the two main protostellar components.