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arXiv 2103.16213astro-ph.EP
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HD 143006:环联行星还是错位的圆盘?

HD 143006: circumbinary planet or misaligned disc?

G. Ballabio, R. Nealon, R. D. Alexander, N. Cuello, C. Pinte, D. J. Price

摘要:

原行星盘内的错位现在经常被观察到,散射光图像中的阴影等特征表明偏离了共面几何形状。VLT/SPHERE对HD 143006周围圆盘的观测显示出大规模的不对称性,以及两条狭窄的黑暗通道,这表明阴影。ALMA观测还揭示了圆盘中存在环和间隙,以及大半径的明亮弧。我们提出了新的HD 143006的流体动力学模拟,并表明,与强烈倾斜的二进制和外行星伴侣的配置是最合理的解释所观察到的形态特征。我们从我们的模拟计算合成观测,并成功地再现了狭窄的阴影和红外散射光中看到的亮度不对称。此外,我们再现了在毫米连续观测到的大尘埃,由于在CO运动学中检测到的10木星质量的行星。我们的模拟还显示了一个环行星盘的形成,这是相对于外盘错位。内盘投射的狭窄阴影和行星引起的盘运动学“扭结”都预计将在$\sim$ 5-10年的时间尺度上移动,这是对我们模型的一个潜在的可观察测试。如果得到证实,HD 143006将是已知的第一颗在严重偏离轨道的环联星。

英文摘要:

Misalignments within protoplanetary discs are now commonly observed, and features such as shadows in scattered light images indicate departure from a co-planar geometry. VLT/SPHERE observations of the disc around HD 143006 show a large-scale asymmetry, and two narrow dark lanes which are indicative of shadowing. ALMA observations also reveal the presence of rings and gaps in the disc, along with a bright arc at large radii. We present new hydrodynamic simulations of HD 143006, and show that a configuration with both a strongly inclined binary and an outer planetary companion is the most plausible to explain the observed morphological features. We compute synthetic observations from our simulations, and successfully reproduce both the narrow shadows and the brightness asymmetry seen in IR scattered light. Additionally, we reproduce the large dust observed in the mm continuum, due to a 10 Jupiter mass planet detected in the CO kinematics. Our simulations also show the formation of a circumplanetary disc, which is misaligned with respect to the outer disc. The narrow shadows cast by the inner disc and the planet-induced "kink" in the disc kinematics are both expected to move on a time-scale of $\sim$ 5-10 years, presenting a potentially observable test of our model. If confirmed, HD 143006 would be the first known example of a circumbinary planet on a strongly misaligned orbit.

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