ON THE ORBIT OF EXOPLANET WASP-12b

ON THE ORBIT OF EXOPLANET WASP-12b
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在系外行星 WASP-12b 的轨道上

DOI:
10.1088/0004-637x/727/2/125
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发表时间:
2011
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Campo C
Campo C
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--
文献类型:
--
作者:
Campo C

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我们使用斯皮策太空望远镜上的红外阵列相机观测了系外行星WASP-12 b的两次次日食。WASP-12 b与它的G型星星非常接近,这导致了极端的潮汐力,能够在短至几十年的时间内引起拱点岁差。如果轨道有显著的偏心率,这种进动将是可测量的,从而导致对潮汐勒夫数的估计和对行星内部中心集中程度的评估。López-Morales等人报告的一个初始的地基二次日食阶段。(0.510±0.002)表示4.5 σ水平的偏心率。赫布等人的分光轨道偏心率为0.049±0.015,3σ,意味着食相为0.509±0.007。然而,有一个充分记录的倾向,光谱数据高估小偏心率。食相为0.5010±0.0006(3.6和5.8 μm)和0.5006±0.0007(4.5和8.0 μm)。一个不太可能的轨道岁差场景调用斯皮策观测期间的轨道对齐可以解释这种明显的差异,但洛佩斯-莫拉莱斯等人的最后日食阶段。(0.510±+ 0.007− 0.006)与优于2σ的圆形轨道一致。轨道拟合所有可用的凌日、日食和径向速度数据表明岁差小于1σ;非岁差解拟合得更好。我们还根据最近的重新分析评论斯皮策系外行星数据的分析和报告。
We observed two secondary eclipses of the exoplanet WASP-12b using the Infrared Array Camera on the Spitzer Space Telescope. The close proximity of WASP-12b to its G-type star results in extreme tidal forces capable of inducing apsidal precession with a period as short as a few decades. This precession would be measurable if the orbit had a significant eccentricity, leading to an estimate of the tidal Love number and an assessment of the degree of central concentration in the planetary interior. An initial ground-based secondary-eclipse phase reported by López-Morales et al.(0.510±0.002) implied eccentricity at the 4.5 σ level. The spectroscopic orbit of Hebb et al. has eccentricity 0.049±0.015, a 3σ result, implying an eclipse phase of 0.509±0.007. However, there is a well-documented tendency of spectroscopic data to overestimate small eccentricities. Our eclipse phases are 0.5010±0.0006 (3.6 and 5.8 μm) and 0.5006±0.0007 (4.5 and 8.0 μm). An unlikely orbital precession scenario invoking an alignment of the orbit during the Spitzer observations could have explained this apparent discrepancy, but the final eclipse phase of López-Morales et al.(0.510±+ 0.007− 0.006) is consistent with a circular orbit at better than 2σ. An orbit fit to all the available transit, eclipse, and radial-velocity data indicates precession at< 1σ; a non-precessing solution fits better. We also comment on analysis and reporting for Spitzer exoplanet data in light of recent re-analyses.
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