The disc surrounding PDS 70, with two directly imaged embedded giant planets, is an ideal laboratory to study planet-disc interaction. We present three-dimensional smoothed particle hydrodynamics simulations of the system. In our simulations, planets, which are free to migrate and accrete mass, end up in a locked resonant configuration that is dynamically stable. We show that features observed at infrared (scattered light) and millimetre (thermal continuum) wavelengths are naturally explained by the accretion stream onto the outer planet, without requiring a circumplanetary disc around planet c. We post-processed our near-infrared synthetic images in order to account for observational biases known to affect high-contrast images. Our successful reproduction of the observations indicates that planet-disc dynamical interactions alone are sufficient to explain the observations of PDS 70.

中文翻译：

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PDS 70 中的行星迁移、共振锁定和吸积流：比较模型和数据

PDS 70 周围的圆盘有两个直接成像的嵌入式巨行星，是研究行星-圆盘相互作用的理想实验室。我们提出了系统的三维平滑粒子流体动力学模拟。在我们的模拟中，可以自由迁移和吸积质量的行星最终处于动态稳定的锁定共振配置。我们表明，在红外（散射光）和毫米（热连续谱）波长下观察到的特征可以通过外行星上的吸积流自然地解释，而不需要围绕行星 c 的环行星盘。我们对近红外合成图像进行了后处理，以解决已知会影响高对比度图像的观察偏差。