GAP CLEARING BY PLANETS IN A COLLISIONAL DEBRIS DISK
GAP CLEARING BY PLANETS IN A COLLISIONAL DEBRIS DISK
复制标题
碰撞碎片盘中的行星清除间隙
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Kuchner
中科院分区：
文献类型：
--
作者：
E. Nesvold;M. Kuchner
我们应用我们的3D碎片盘模型，SMACK，模拟一个行星在一个圆形轨道附近的一个环的星子，正在经历毁灭性的碰撞。先前对行星在无碰撞碎片盘中打开间隙的模拟发现，差距的宽度与行星质量的2/7次方（α = 2/7）成比例。我们发现，碰撞盘中的间隙大小仍然服从与行星质量成比例的幂律，但幂律的指数α依赖于系统的年龄t相对于盘的碰撞时标tcoll的关系，α = 0.32（t/tcoll）-0.04，由此推断的行星质量比经典间隙定律预测的小5倍。增加的间隙尺寸可能源于碰撞和混沌区附近的平均运动共振之间的相互作用。我们调查的磁盘粒子的初始偏心率分布的影响，并发现一个可以忽略不计的影响差距大小在木星行星质量，因为碰撞往往会擦除记忆的初始粒子偏心率分布。最后，我们发现，特洛伊类似物的存在是一个潜在的强大的诊断行星的质量范围为100 -10兆焦耳。我们应用我们的模型对北落师门、HR 4796 A、HD 202628、HD 181327和β Picture周围的行星设定了新的上限。
We apply our 3D debris disk model, SMACK, to simulate a planet on a circular orbit near a ring of planetesimals that are experiencing destructive collisions. Previous simulations of a planet opening a gap in a collisionless debris disk have found that the width of the gap scales as the planet mass to the 2/7th power (α = 2/7). We find that gap sizes in a collisional disk still obey a power law scaling with planet mass, but that the index α of the power law depends on the age of the system t relative to the collisional timescale tcoll of the disk by α = 0.32(t/tcoll)−0.04, with inferred planet masses up to five times smaller than those predicted by the classical gap law. The increased gap sizes likely stem from the interaction between collisions and the mean motion resonances near the chaotic zone. We investigate the effects of the initial eccentricity distribution of the disk particles and find a negligible effect on the gap size at Jovian planet masses, since collisions tend to erase memory of the initial particle eccentricity distributions. Finally, we find that the presence of Trojan analogs is a potentially powerful diagnostic of planets in the mass range ∼1–10 MJup. We apply our model to place new upper limits on planets around Fomalhaut, HR 4796 A, HD 202628, HD 181327, and β Pictoris.
影响因子：
4.9
作者：
Leinhardt, Zoe M.;Stewart, Sarah T.
通讯作者：
Stewart, Sarah T.