论文标题
煎饼的持久性和潮汐破坏事件中自我重度的复兴
The persistence of pancakes and the revival of self-gravity in tidal disruption events
论文作者
论文摘要
超级质量黑洞（SMBH）的潮汐破坏恒星为明亮的吸积耀斑驱动，并且这种潮汐破坏事件（TDES）的理论建模可以提供直接的方法来从观察值中推断SMBH性质。以前已经表明，带有$β= r _ {\ rm t}/r _ {\ rm p} = 1 $的TDE，其中$ r _ {\ rm t} $是潮汐破坏半径和$ r _ {\ rm p} $是the of the the the the the the starane ca of starane of starane'潮汐破坏的碎屑被压缩到恒星轨道平面内的一维线中。在这里，我们表明该结果通常适用于所有恒星完全中断的TDE，即满足$β\ gtrsim 1 $的所有TDE。我们表明，这种苛性碱的位置始终位于恒星的潮汐破坏半径之外，并且在苛性碱附近的气体压缩最多是轻度超音速，这导致气体密度超过黑洞的潮汐密度的绝热增加。因此，与最近的模拟一致，这种平面煎饼即使对于大$β$，即使对于大$β$也可以振兴自我重力的影响。这一发现表明，对于所有恒星完全破坏的TDE，自我重度是恢复的，后过性的，使碎屑流狭窄地限制在其横向方向上，并使碎屑容易发生引力不稳定。
The destruction of a star by the tides of a supermassive black hole (SMBH) powers a bright accretion flare, and the theoretical modeling of such tidal disruption events (TDEs) can provide a direct means of inferring SMBH properties from observations. Previously it has been shown that TDEs with $β= r_{\rm t}/r_{\rm p} = 1$, where $r_{\rm t}$ is the tidal disruption radius and $r_{\rm p}$ is the pericenter distance of the star, form an in-plane caustic, or ``pancake,'' where the tidally disrupted debris is compressed into a one-dimensional line within the orbital plane of the star. Here we show that this result applies generally to all TDEs for which the star is fully disrupted, i.e., that satisfy $β\gtrsim 1$. We show that the location of this caustic is always outside of the tidal disruption radius of the star and the compression of the gas near the caustic is at most mildly supersonic, which results in an adiabatic increase in the gas density above the tidal density of the black hole. As such, this in-plane pancake revitalizes the influence of self-gravity even for large $β$, in agreement with recent simulations. This finding suggests that for all TDEs in which the star is fully disrupted, self-gravity is revived post-pericenter, keeps the stream of debris narrowly confined in its transverse directions, and renders the debris prone to gravitational instability.
