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A～0.2-solar-mass protostar with a Keplerian disk in the very young L1527 IRS system

机译：在很年轻的L1527 IRS系统中，带有开普勒圆盘的〜0.2太阳质量原恒星

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这篇论文报告了利用亚毫米干涉测量法来获得rn对处在最早演化阶段(Class O阶段)的一颗原rn始恒星周围的一个大型“开普勒盘”的首次探rn测结果。迄今所观测到的最小“原始恒星一外rn包层”质量比大约是2．1。新发现的这颗原始恒rn星(编号为L1527 IRS)质量大约为0．2个太阳质rn量，“原始恒星一外包层”质量比大约O．2。rnL1527已经有了一个至少有7个木星质量的原rn始行星盘，与人们所假设的能够形成行星的盘rn相似，所以它似乎具有一个正在形成中的太阳rn系的全部要素。%In their earliest stages, protostars accrete mass from their surrounding envelopes through circumstellar disks. Until now, the smallest observed protostar-to-envelope mass ratio was about 2.1 (ref. 1). The protostar L1527 IRS is thought to be in the earliest stages of star formation2. Its envelope contains about one solar mass of material within a radius of about 0.05 parsecs (refs 3,4), and earlier observations suggested the presence of an edge-on disk5. Here we report observations of dust continuum emission and CO (rotational quantum number J= 2 → 1) line emission from the disk around L1527 IRS, from which we determine a protostellar mass of 0.19 ± 0.04 solar masses and a protostar-to-envelope mass ratio of about 0.2. We conclude that most of the luminosity is generated through the accretion process, with an accretion rate of about 6.6 × 10~(-7) solar masses per year. If it has been accreting at that rate through much of its life, its age is approximately 300,000 years, although theory suggests larger accretion rates earlier, so it may be younger. The presence of a rotationally supported disk is confirmed, and significantly more mass may be added to its planet-forming region as well as to the protostar itself in the future.
机译：这篇论文报告了利用亚毫米干涉测量法来获得rn对处在最早演化阶段(Class O阶段)的一颗原rn始恒星周围的一个大型“开普勒盘”的首次探rn测结果。迄今所观测到的最小“原始恒星一外rn包层”质量比大约是2．1。新发现的这颗原始恒rn星(编号为L1527 IRS)质量大约为0．2个太阳质rn量，“原始恒星一外包层”质量比大约O．2。rnL1527已经有了一个至少有7个木星质量的原rn始行星盘，与人们所假设的能够形成行星的盘rn相似，所以它似乎具有一个正在形成中的太阳rn系的全部要素。%In their earliest stages, protostars accrete mass from their surrounding envelopes through circumstellar disks. Until now, the smallest observed protostar-to-envelope mass ratio was about 2.1 (ref. 1). The protostar L1527 IRS is thought to be in the earliest stages of star formation2. Its envelope contains about one solar mass of material within a radius of about 0.05 parsecs (refs 3,4), and earlier observations suggested the presence of an edge-on disk5. Here we report observations of dust continuum emission and CO (rotational quantum number J= 2 → 1) line emission from the disk around L1527 IRS, from which we determine a protostellar mass of 0.19 ± 0.04 solar masses and a protostar-to-envelope mass ratio of about 0.2. We conclude that most of the luminosity is generated through the accretion process, with an accretion rate of about 6.6 × 10~(-7) solar masses per year. If it has been accreting at that rate through much of its life, its age is approximately 300,000 years, although theory suggests larger accretion rates earlier, so it may be younger. The presence of a rotationally supported disk is confirmed, and significantly more mass may be added to its planet-forming region as well as to the protostar itself in the future.

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  • 来源
    《Nature》 |2012年第7427期|83-85a2|共4页
  • 作者

    John J. Tobin; Lee Hartmann; Hsin-Fang Chiang; David J. Wilner; Leslie W. Looney; Laurent Loinard; Nuria Calvet; Paola DAlessio;

  • 作者单位

    National Radio Astronomy Observatory.Charlottesville, Virginia 22903, USA;

    De partment of Astronomy, University of Michigan,Ann Arbor,Michigan 48109, USA;

    Department of Astronomy, University of Illinois, Urbana, Illinois 61801, USA,lnstitute for Astronomy and NASA Astrobiology Institute, University of Hawaii at Manoa, Hilo, Hawaii 96720, USA;

    Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA;

    Department of Astronomy, University of Illinois, Urbana, Illinois 61801, USA;

    Centro de Radioastronomia y Astrofisica, UNAM, Apartado Postal 3-72 (Xangari), 58089 Morelia, Michoacan, Mexico,Max-Planck-lnstitut fur Radioastronomie Auf dem Hugel 69,53121 Bonn, Germany;

    De partment of Astronomy, University of Michigan,Ann Arbor,Michigan 48109, USA;

    Centro de Radioastronomia y Astrofisica, UNAM, Apartado Postal 3-72 (Xangari), 58089 Morelia, Michoacan, Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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