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Collapsars as a major source of r-process elements

机译：折叠作为R-Process元素的主要来源

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The production of elements by rapid neutron capture (r-process) in neutron-star mergers is expected theoretically and is supported by multimessenger observations(1-3) of gravitational-wave event GW170817: this production route is in principle sufficient to account for most of the r-process elements in the Universe(4). Analysis of the kilonova that accompanied GW170817 identified(5,6) delayed outflows from a remnant accretion disk formed around the newly born black hole(7-10) as the dominant source of heavy r-process material from that event(9,11). Similar accretion disks are expected to form in collapsars (the supernova-triggering collapse of rapidly rotating massive stars), which have previously been speculated to produce r-process elements(12,13). Recent observations of stars rich in such elements in the dwarf galaxy Reticulum II14, as well as the Galactic chemical enrichment of europium relative to iron over longer timescales(15,16), are more consistent with rare supernovae acting at low stellar metallicities than with neutron-star mergers. Here we report simulations that show that collapsar accretion disks yield sufficient r-process elements to explain observed abundances in the Universe. Although these supernovae are rarer than neutron-star mergers, the larger amount of material ejected per event compensates for the lower rate of occurrence. We calculate that collapsars may supply more than 80 per cent of the r-process content of the Universe.
机译：在理论上，通过快速中子捕获（R-Process）在中子捕获（R-Process）中产生元素的生产，并由Gravitational-Wave-Fevel GW170817的Multimessenger观察（1-3）支撑：该生产路线原则上足以满足宇宙中的R-Process元素（4）。伴随GW170817鉴定的千克诺瓦（5,6）延迟从新出生的黑洞（7-10）周围形成的剩余的空隙圆盘，作为来自该事件的重型R-工艺材料的主导来源（9,11） 。预计类似的吸收磁盘将在折叠中形成（快速旋转的大型恒星的超新加坡触发崩溃），以前已经推测以产生R-工艺元素（12,13）。最近富含铁的贫富在这种元素中的恒星的观察结果以及相对于熨斗的欧罗米的银河化学富集（15,16），与低恒星金属的罕见超新月比中子相比，更加一致-Star合并。在这里，我们报告了模拟，表明折叠成像磁盘产生足够的R-Process元素，以解释宇宙中的大量。虽然这些超新星比中子星相罕见，但每次事件喷射的较大量的材料补偿了较低的发生率。我们计算折叠可以提供超过80％的宇宙的R-Process含量。

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  • 来源
    《Nature》 |2019年第7755期|241-244|共4页
  • 作者

    Siegel Daniel M.; Barnes Jennifer; Metzger Brian D.;

  • 作者单位

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA|Columbia Univ Columbia Astrophys Lab 538 W 120th St New York NY 10027 USA|Perimeter Inst Theoret Phys Waterloo ON Canada|Univ Guelph Guelph ON Canada;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA|Columbia Univ Columbia Astrophys Lab 538 W 120th St New York NY 10027 USA;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA|Columbia Univ Columbia Astrophys Lab 538 W 120th St New York NY 10027 USA;

  • 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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