arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.10996astro-ph.HEastro-ph.SR
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具有丰度和真实结构的恒星潮汐破坏事件(STARS):后备率库

Stellar Tidal Disruption Events with Abundances and Realistic Structures (STARS): Library of Fallback Rates

Jamie A. P. Law-Smith, David A. Coulter, James Guillochon, Brenna Mockler, Enrico Ramirez-Ruiz

摘要:

我们提出的STARS库,潮汐中断事件(TDE)模拟网格内插提供质量回落率($dM/dt$)的黑洞的主序星的任何恒星质量,恒星年龄,和碰撞参量。我们使用一维的恒星演化代码来构建具有精确恒星结构和化学丰度的恒星,然后在三维自适应网格流体动力学代码中使用亥姆霍兹状态方程进行潮汐破裂模拟,分辨率前所未有:从131到524个细胞穿过恒星的直径。回退率的插值库可以在GitHub(https://github.com/jamielaw-smith/STARS_library)上找到,版本1.0.0在Zenodo上存档;人们可以在库中查询任何恒星质量、恒星年龄和碰撞参量。我们提供了新的拟合公式的重要中断量($β_{\rm crit}, ΔM, \dot M_{\rm peak}, t_{\rm peak}, n_\infty$)作为恒星质量,恒星年龄和碰撞参量的函数。这些量中的每一个都随着恒星质量和恒星年龄的变化而显着变化,但我们能够将所有的模拟简化为仅取决于恒星结构的单一关系,其特征在于单一参数$ρ_c/\barρ$和碰撞参量$β$。我们还发现,一般来说,更集中的恒星有更陡的$dM/dt$上升斜率和更浅的衰变斜率。对于相同的$ΔM$,$dM/dt$的形状随恒星质量的变化显着,有希望从TDE光变曲线单独的恒星性质的潜在确定。$dM/dt$的形状在很大程度上取决于恒星的结构,并在一定程度上取决于恒星的质量,这意味着使用这个库拟合TDE提供了一个更好的机会来确定被破坏的恒星和黑洞的性质。

英文摘要:

We present the STARS library, a grid of tidal disruption event (TDE) simulations interpolated to provide the mass fallback rate ($dM/dt$) to the black hole for a main-sequence star of any stellar mass, stellar age, and impact parameter. We use a one-dimensional stellar evolution code to construct stars with accurate stellar structures and chemical abundances, then perform tidal disruption simulations in a three-dimensional adaptive-mesh hydrodynamics code with a Helmholtz equation of state, in unprecedented resolution: from 131 to 524 cells across the diameter of the star. The interpolated library of fallback rates is available on GitHub (https://github.com/jamielaw-smith/STARS_library) and version 1.0.0 is archived on Zenodo; one can query the library for any stellar mass, stellar age, and impact parameter. We provide new fitting formulae for important disruption quantities ($β_{\rm crit}, ΔM, \dot M_{\rm peak}, t_{\rm peak}, n_\infty$) as a function of stellar mass, stellar age, and impact parameter. Each of these quantities vary significantly with stellar mass and stellar age, but we are able to reduce all of our simulations to a single relationship that depends only on stellar structure, characterized by a single parameter $ρ_c/\barρ$, and impact parameter $β$. We also find that, in general, more centrally concentrated stars have steeper $dM/dt$ rise slopes and shallower decay slopes. For the same $ΔM$, the $dM/dt$ shape varies significantly with stellar mass, promising the potential determination of stellar properties from the TDE light curve alone. The $dM/dt$ shape depends strongly on stellar structure and to a certain extent stellar mass, meaning that fitting TDEs using this library offers a better opportunity to determine the nature of the disrupted star and the black hole.

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