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Discovery of two young brown dwarfs in an eclipsing binary system.

机译:在黯淡的二元系统中发现了两个年轻的棕色矮星。

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摘要

Brown dwarfs are considered to be 'failed stars' in the sense that they are born with masses between the least massive stars (0.072 solar masses, M(o)) and the most massive planets (approximately 0.013M(o)); they therefore serve as a critical link in our understanding of the formation of both stars and planets. Even the most fundamental physical properties of brown dwarfs remain, however, largely unconstrained by direct measurement. Here we report the discovery of a brown-dwarf eclipsing binary system, in the Orion Nebula star-forming region, from which we obtain direct measurements of mass and radius for these newly formed brown dwarfs. Our mass measurements establish both objects as brown dwarfs, with masses of 0.054 +/- 0.005M(o) and 0.034 +/- 0.003M(o). At the same time, with radii relative to the Sun's of 0.669 +/- 0.034R(o) and 0.511 +/- 0.026R(o), these brown dwarfs are more akin to low-mass stars in size. Such large radii are generally consistent with theoretical predictions for young brown dwarfs in the earliest stages of gravitational contraction. Surprisingly, however, we find that the less-massive brown dwarf is the hotter of the pair; this result is contrary to the predictions of all current theoretical models of coeval brown dwarfs.
机译:从它们出生时的质量来看,棕矮星被认为是“失败的恒星”,它们的质量介于最小质量的恒星(0.072太阳质量,M(o))和最大质量的行星(约0.013M(o))之间;因此,它们是我们对恒星和行星形成的理解的关键环节。但是,即使是褐矮星的最基本物理特性也仍然不受直接测量的限制。在这里,我们报告了在猎户星云恒星形成区域发现一个褐矮星双星系统的发现,从中我们获得了这些新形成的褐矮星的质量和半径的直接测量值。我们的质量测量将两个物体都建立为褐色矮星,质量为0.054 +/- 0.005M(o)和0.034 +/- 0.003M(o)。同时,相对于太阳的半径为0.669 +/- 0.034R(o)和0.511 +/- 0.026R(o),这些褐色矮星的大小更类似于低质量恒星。如此大的半径通常与重力收缩最早阶段的年轻褐矮星的理论预测一致。然而,令人惊讶的是,我们发现质量较弱的棕矮星是这对中最热的。这一结果与当代所有的同年龄褐矮星理论模型的预测相悖。

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  • 来源
    《Nature》 |2006年第7082期|P.311-314|共4页
  • 作者单位

    Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA. keivan.stassun@vanderbilt.edu;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 基础医学;
  • 关键词

    brown; Mass; NOS; prediction;

    机译:棕色;质量;NOS;预测;

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