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Global simulations of tidal disruption event disc formation via stream injection in GRRMHD
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-07-28 , DOI: 10.1093/mnras/stab2172
Brandon Curd 1
Affiliation  

We use the general relativistic radiation magnetohydrodynamics code KORAL to simulate the accretion disc formation resulting from the tidal disruption of a solar mass star around a supermassive black hole (BH) of mass 106 M⊙. We simulate the disruption of artificially more bound stars with orbital eccentricity e ≤ 0.99 (compared to the more realistic case of parabolic orbits with e = 1) on close orbits with impact parameter β ≥ 3. We use a novel method of injecting the tidal stream into the domain, and we begin the stream injection at the peak fallback rate in this study. For two simulations, we choose e = 0.99 and inject mass at a rate that is similar to parabolic TDEs. We find that the disc only becomes mildly circularized with eccentricity e ≈ 0.6 within the 3.5 d that we simulate. The rate of circularization is faster for pericenter radii that come closer to the BH. The emitted radiation is mildly super-Eddington with $L_{\rm {bol}}\approx 3{-}5\, L_{\rm {Edd}}$ and the photosphere is highly asymmetric with the photosphere being significantly closer to the inner accretion disc for viewing angles near pericenter. We find that soft X-ray radiation with Trad ≈ 3–5 × 105 K may be visible for chance viewing angles. Our simulations suggest that TDEs should be radiatively inefficient with η ≈ 0.009–0.014.

中文翻译:

通过 GRRMHD 中的流注入对潮汐中断事件盘形成的全局模拟

我们使用广义相对论辐射磁流体动力学代码 KORAL 来模拟由太阳质量恒星在质量为 106 M⊙ 的超大质量黑洞 (BH) 周围的潮汐破坏引起的吸积盘形成。我们模拟了轨道偏心率 e ≤ 0.99 的人工束缚恒星在撞击参数 β ≥ 3 的近距离轨道上的破坏(与 e = 1 的抛物线轨道的更现实情况相比)。我们使用一种注入潮汐流的新方法进入域,我们在本研究中以峰值回退速率开始流注入。对于两个模拟,我们选择 e = 0.99 并以类似于抛物线 TDE 的速率注入质量。我们发现,在我们模拟的 3.5 天内,圆盘仅以偏心率 e ≈ 0.6 轻度圆化。对于更接近 BH 的中心半径,圆化速率更快。发射的辐射是轻度超爱丁顿辐射,$L_{\rm {bol}}\约 3{-}5\, L_{\rm {Edd}}$,并且光球层高度不对称,光球层明显更接近于内吸积盘,用于近中心附近的视角。我们发现,Trad ≈ 3–5 × 105 K 的软 X 射线辐射对于偶然的视角可能是可见的。我们的模拟表明,当 η ≈ 0.009–0.014 时,TDE 的辐射效率应该很低。我们发现,Trad ≈ 3–5 × 105 K 的软 X 射线辐射对于偶然的视角可能是可见的。我们的模拟表明,当 η ≈ 0.009–0.014 时,TDE 的辐射效率应该很低。我们发现,Trad ≈ 3–5 × 105 K 的软 X 射线辐射对于偶然的视角可能是可见的。我们的模拟表明,当 η ≈ 0.009–0.014 时,TDE 的辐射效率应该很低。
更新日期:2021-07-28
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