arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01240astro-ph.HE
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光学潮汐扰动事件的物质外流极限

Limits on mass outflow from optical tidal disruption events

Tatsuya Matsumoto, Tsvi Piran

摘要:

光学/紫外潮汐破坏事件(TDEs)的发现令人惊讶。人们的期望是,在返回近心点时,恒星碎片流将形成一个致密的磁盘,将发射软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,周围光学厚度的物质重新处理了圆盘的X射线发射,并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。当应用这种方法的超新星样本,我们的估计是一致的一个更详细的流体动力学模型。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问题。

英文摘要:

The discovery of optical/UV tidal disruption events (TDEs) was surprising. The expectation was that, upon returning to the pericenter, the stellar-debris stream will form a compact disk 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 disk'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 modeling. 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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