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arXiv 1202.2655astro-ph.EP
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β Picaib巨行星的轨道特征

Orbital characterization of the βPictoris b giant planet

G. Chauvin, A. -M. Lagrange, H. Beust, M. Bonnefoy, A. Boccaletti, D. Apai, F. Allard, D. Ehrenreich, J. H. V. Girard, D. Mouillet, D. Rouan

摘要:

2010年6月,我们证实了在年轻恒星Beta Picture的圆盘中存在一颗巨大的行星,位于距离恒星8 AU和15 AU之间。这颗年轻的行星提供了一个难得的机会,可以在相当短的时间内使用成像技术监测大部分轨道。在甚大望远镜(VLT)上使用NAOS-CONICA自适应光学仪器(NACO),我们在2010年和2011年的四个新时期获得了Ks和L'滤波器中Bpic系统的重复后续图像。补充这些数据与以前的测量,我们进行了均匀的分析,其中包括超过八年,准确地监测Bpic b相对于恒星的位置。在行星相对位置随时间演化的基础上,我们得到了最适合我们测量的轨道解。马尔可夫链蒙特卡罗方法发现更可靠的结果。结果表明,轨道的半长轴在8- 9天文单位之间,轨道周期在17- 21年之间,轨道的偏心率e < 0.17,轨道的最高点在i=88.5 ± 1.7度,升交点的经度严格限制在Ω = -147.5 ± 1.5度。这些结果表明,该行星的轨道平面可能在主盘的中平面之上,并且与盘的翘曲分量在3.5度和4.0度之间倾斜是相容的。这表明行星在Bpic盘的内部翘曲盘形态的起源中起着关键作用。最后,这些轨道参数与1981年11月观测到的类似凌日事件的假设一致,也与Bpic系统中观测到的彗星活动有关。

英文摘要:

In June 2010, we confirmed the existence of a giant planet in the disk of the young star Beta Pictoris, located between 8 AU and 15 AU from the star. This young planet offers the rare opportunity to monitor a large fraction of the orbit using the imaging technique over a reasonably short timescale. Using the NAOS-CONICA adaptive-optics instrument (NACO) at the Very Large Telescope (VLT), we obtained repeated follow-up images of the Bpic system in the Ks and L' filters at four new epochs in 2010 and 2011. Complementing these data with previous measurements, we conduct a homogeneous analysis, which covers more than eight yrs, to accurately monitor the Bpic b position relative to the star. On the basis of the evolution of the planet's relative position with time, we derive the best-fit orbital solutions for our measurements. More reliable results are found with a Markov-chain Monte Carlo approach. The solutions favor a low-eccentricity orbit e < 0.17, with semi-major axis in the range 8--9 AU corresponding to orbital periods of 17--21 yrs. Our solutions favor a highly inclined solution with a peak around i=88.5+-1.7 deg, and a longitude of ascending node tightly constrained at Omega = -147.5+-1.5 deg. These results indicate that the orbital plane of the planet is likely to be above the midplane of the main disk, and compatible with the warp component of the disk being tilted between 3.5 deg and 4.0 deg. This suggests that the planet plays a key role in the origin of the inner warped-disk morphology of the Bpic disk. Finally, these orbital parameters are consistent with the hypothesis that the planet is responsible for the transit-like event observed in November 1981, and also linked to the cometary activity observed in the Bpic system.

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