Limits on mass outflow from optical tidal disruption events

Limits on mass outflow from optical tidal disruption events
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光潮汐破坏事件造成的质量流出的限制

DOI:
10.1093/mnras/stab240
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发表时间:
2021
期刊:
Monthly Notices of Royal Astronomical Society
影响因子:
--
通讯作者:
Tatsuya Matsumoto and Tsvi Piran
Tatsuya Matsumoto and Tsvi Piran
中科院分区:
--
文献类型:
--
作者:
Zhang An;Kawashima Daisuke;Obara Hiromichi;Takei Masahiro;Tatsuya Matsumoto and Tsvi Piran

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光学/紫外(紫外)潮汐破坏事件(TDEs)的发现令人惊讶。人们的期望是,当返回近心点时,恒星碎片流将形成一个致密的圆盘,并发出软X射线。事实上,第一个TDE是在这个能带中发现的。对光学/紫外线事件的一个常见解释是,周围的光学厚物质重新处理了圆盘的X射线发射,并将其从一个大的光球中发射出来。如果吸积遵循超爱丁顿质量下降率,它将不可避免地导致能量外流,自然提供再处理物质。我们在这里描述了一种新的方法来估计,使用所观察到的光度和温度,从光学瞬变流出的质量和能量。当将这种方法应用于超新星样本时,我们的估计与更详细的流体动力学模型相一致。对于目前几十个光学TDE的样本,观测到的光度和温度意味着流出物的质量明显大于典型的恒星质量,这对这种常见的后处理图像提出了一个问题。
The discovery of optical/UV (ultraviolet) tidal disruption events (TDEs) was surprising. The expectation was that, upon returning to the pericentre, the stellar-debris stream will form a compact disc that will emit soft X-rays. Indeed, the first TDEs were discovered in this energy band. A common explanation for the optical/UV events is that surrounding optically thick matter reprocesses the disc’s X-ray emission and emits it from a large photosphere. If accretion follows the super-Eddington mass infall rate, it would inevitably result in an energetic outflow, providing naturally the reprocessing matter. We describe here a new method to estimate, using the observed luminosity and temperature, the mass and energy of outflows from optical transients. When applying this method to a sample of supernovae, our estimates are consistent with a more detailed hydrodynamic modelling. For the current sample of a few dozen optical TDEs, the observed luminosity and temperature imply outflows that are significantly more massive than typical stellar masses, posing a problem to this common reprocessing picture.
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