arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.2074astro-ph.SR
收藏

一颗没有氢包层的低能核心坍缩超新星

A low energy core-collapse supernova without a hydrogen envelope

Stefano Valenti, Andrea Pastorello, Enrico Cappellaro, Stefano Benetti, Paolo Mazzali, Jose Manteca, Stefan Taubenberger, Nancy Elias-Rosa, Rafael Ferrando, Ave… 展开作者

Stefano Valenti, Andrea Pastorello, Enrico Cappellaro, Stefano Benetti, Paolo Mazzali, Jose Manteca, Stefan Taubenberger, Nancy Elias-Rosa, Rafael Ferrando, Avet Harutyunyan, Veli-Pekka Hentunen, Markku Nissinen, Elena Pian, Massimo Turatto, Luca Zampieri, Stephen J. Smartt, .

摘要:

大质量恒星的最终命运取决于许多因素,包括质量、旋转速率、磁场和金属丰度。理论表明,一些大质量恒星(最初大于25-30太阳质量)最终会成为沃尔夫-拉叶星,由于强烈的恒星风造成质量损失而缺乏氢。这些恒星中质量最大的恒星有可能形成黑洞的核心,理论预测爆炸产生的喷出物具有低动能,微弱的光学显示和小质量分数的放射性镍(1,2,3)。低能超新星的另一个起源是相对低质量恒星(7-9个太阳质量)的氧-氖核心通过电子捕获而坍缩(4,5)。然而,没有弱的,缺氢的,核心坍缩的超新星是已知的。在这里,我们报告说,这种微弱的,低能量的核心坍缩超新星确实存在,并表明SN 2008 ha是有史以来观测到的最微弱的贫氢超新星。我们提出,其他类似的事件已经被观察到,但它们被错误地归类为特殊的热核超新星(有时标记为SN 2002 cx类事件(6))。这一发现可能将这些微弱的超新星与一些长时间的伽马射线暴联系起来。极微弱的氢剥离的核心坍缩超新星被认为产生了那些长的伽马射线暴,其余辉没有显示出与超新星有关的证据(7,8,9)。

英文摘要:

The final fate of massive stars depends on many factors, including mass, rotation rate, magnetic fields and metallicity. Theory suggests that some massive stars (initially greater than 25-30 solar masses) end up as Wolf-Rayet stars which are deficient in hydrogen because of mass loss through strong stellar winds. The most massive of these stars have cores which may form a black hole and theory predicts that the resulting explosion produces ejecta of low kinetic energy, a faint optical display and a small mass fraction of radioactive nickel(1,2,3). An alternative origin for low energy supernovae is the collapse of the oxygen-neon core of a relatively lowmass star (7-9 solar masses) through electron capture(4,5). However no weak, hydrogen deficient, core-collapse supernovae are known. Here we report that such faint, low energy core-collapse supernovae do exist, and show that SN2008ha is the faintest hydrogen poor supernova ever observed. We propose that other similar events have been observed but they have been misclassified as peculiar thermonuclear supernovae (sometimes labelled SN2002cx-like events(6)). This discovery could link these faint supernovae to some long duration gamma-ray bursts. Extremely faint, hydrogen-stripped core-collapse supernovae have been proposed to produce those long gamma-ray bursts whose afterglows do not show evidence of association with supernovae (7,8,9).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑