Stellar Revival and Repeated Flares in Deeply Plunging Tidal Disruption Events
Stellar Revival and Repeated Flares in Deeply Plunging Tidal Disruption Events
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DOI：
10.3847/2041-8213/ac5118
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
C. Nixon;E. Coughlin
中科院分区：
文献类型：
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作者：
C. Nixon;E. Coughlin
具有潮汐半径rt和近心距离rp的潮汐破裂事件的特征在于量β = rt/rp，并且“深相遇”具有β <$1。我们假设存在一个临界值β β c β c β 1来区分部分和完全的破坏：对于β β c，星星被完全摧毁，因此所有的深碰撞都应该是完全的。在这里，我们通过提供一个γ = 5/3、类太阳多变性和106 M ⊙黑洞之间β = 16相遇的例子来证明这个假设是不正确的-之前的研究发现β c 0.9-这导致了恒星核心的重组破坏后，约占原始恒星质量的25%。我们建议，核心改革下的自我重力，这仍然是重要的，因为压缩的气体都在近中点附近，压缩发生在轨道平面外，并基本上在近中点后，压缩是在平面内。我们发现，核心形式的束缚轨道上的黑洞，我们讨论了相应的影响，我们的研究结果的背景下，最近观察到的，重复的核瞬变。
Tidal disruption events with tidal radius r t and pericenter distance r p are characterized by the quantity β = r t/r p, and “deep encounters” have β ≫ 1. It has been assumed that there is a critical β ≡ β c ∼ 1 that differentiates between partial and full disruption: for β β c the star is completely destroyed, and hence all deep encounters should be full. Here we show that this assumption is incorrect by providing an example of a β = 16 encounter between a γ = 5/3, solar-like polytrope and a 106 M ⊙ black hole—for which previous investigations have found β c ≃ 0.9—that results in the reformation of a stellar core post-disruption that comprises approximately 25% of the original stellar mass. We propose that the core reforms under self-gravity, which remains important because of the compression of the gas both near pericenter, where the compression occurs out of the orbital plane, and substantially after pericenter, where compression is within the plane. We find that the core forms on a bound orbit about the black hole, and we discuss the corresponding implications of our findings in the context of recently observed, repeating nuclear transients.