标题： 吸积发光低质量行星从压力隆起的迁移陷阱中逃逸 显示英文标题

标题： Accreting luminous low-mass planets escape from migration traps at pressure bumps

摘要： 我们研究了位于三维辐射原行星盘压力陡坡附近的火星到超级地球大小的行星的迁移情况，同时考虑了吸积加热释放的影响。压力陡坡常常被认为能有效地起到迁移陷阱的作用，但我们表明，当考虑到热力作用时，情况发生了变化。我们的模拟结果显示，对于行星质量为$\lesssim$$2\,M_{\oplus}$ 的情况，一旦它们的光度超过线性理论预测的临界值，热驱动会导致它们的轨道变得偏心，从而抑制正向共旋转扭矩（负责形成迁移陷阱）。因此，行星会继续向内迁移穿过压力陡坡。此外，我们发现那些保持圆形轨道并在陡坡的超开普勒区域演化的行星表现出热羽流的反向不对称性，其加热扭矩与标准圆形情况相比具有相反（负）的符号，从而也导致向内迁移。我们还证明，通过在陡坡处积累的小颗粒吸积，可以达到相关行星的超临界光度。我们的研究结果对依赖于压力陡坡存在迁移陷阱的行星形成场景有影响，因为这些陡坡可能会反复产生向内迁移的低质量胚胎，而不是一直容纳新生行星直到它们变得庞大。 显示英文摘要

摘要： We investigate the migration of Mars- to super-Earth-sized planets in the vicinity of a pressure bump in a 3D radiative protoplanetary disc while accounting for the effect of accretion heat release. Pressure bumps have often been assumed to act as efficient migration traps, but we show that the situation changes when the thermal forces are taken into account. Our simulations reveal that for planetary masses $\lesssim$$2\,M_{\oplus}$, once their luminosity exceeds the critical value predicted by linear theory, thermal driving causes their orbits to become eccentric, quenching the positive corotation torque responsible for the migration trap. As a result, planets continue migrating inwards past the pressure bump. Additionally, we find that planets that remain circular and evolve in the super-Keplerian region of the bump exhibit a reversed asymmetry of their thermal lobes, with the heating torque having an opposite (negative) sign compared to the standard circular case, thus leading to inward migration as well. We also demonstrate that the super-critical luminosities of planets in question can be reached through the accretion of pebbles accumulating in the bump. Our findings have implications for planet formation scenarios that rely on the existence of migration traps at pressure bumps, as the bumps may repeatedly spawn inward-migrating low-mass embryos rather than harbouring newborn planets until they become massive.