Transiting Exoplanet Monitoring Project (TEMP). IV. Refined System Parameters, Transit Timing Variations, and Orbital Stability of the Transiting Planetary System HAT-P-25

Transiting Exoplanet Monitoring Project (TEMP). IV. Refined System Parameters, Transit Timing Variations, and Orbital Stability of the Transiting Planetary System HAT-P-25
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凌日系外行星监测项目(TEMP)。

DOI:
10.1088/1538-3873/aab93e
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发表时间:
2018-04
影响因子:
3.5
通讯作者:
14 more
14 more
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wang Xian-Yu;14 more

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我们展示了2013年至2016年在两个天文台使用三台望远镜获得的太阳系外行星HAT-P-25 b的八条新光变曲线。我们使用新的光变曲线,沿着最近的文献资料,估计过境行星的物理和轨道参数。具体来说,我们确定了中天时间(TC)并更新了线性星历,TC [0] = 2456418.80996 ± 0.00025 [BJDTDB]和P = 3.65281572 ± 0.0000095天。我们对凌日时间变化(TTV)进行了搜索,在ΔT = 80 s水平上没有发现明显的TTV信号,这限制了行星-行星相互作用(TTVG)的可能强度。在我们的分析过程中,我们计算了潜在的附近扰动的质量上限。在与HAT-P-25 b的1:2、2:1和3:1共振附近,可以排除质量分别大于0.5、0.3和0.5 M Ω的扰动。此外,基于对光走时效应(LTTE)引起的TTV的分析,我们排除了母星星a = 11.2 Au内存在Mp> 3000 MJ的长周期扰动的可能性。
We present eight new light curves of the transiting extra-solar planet HAT-P-25b obtained from 2013 to 2016 with three telescopes at two observatories. We use the new light curves, along with recent literature material, to estimate the physical and orbital parameters of the transiting planet. Specifically, we determine the mid-transit times (T C ) and update the linear ephemeris, T C[0] = 2456418.80996 ± 0.00025 [BJDTDB] and P = 3.65281572 ± 0.00000095 days. We carry out a search for transit timing variations (TTVs), and find no significant TTV signal at the ΔT = 80 s-level, placing a limit on the possible strength of planet-planet interactions (TTVG). In the course of our analysis, we calculate the upper mass-limits of the potential nearby perturbers. Near the 1:2, 2:1, and 3:1 resonances with HAT-P-25b, perturbers with masses greater than 0.5, 0.3, and 0.5 M ⊕ respectively, can be excluded. Furthermore, based on the analysis of TTVs caused by light travel time effect (LTTE) we also eliminate the possibility that a long-period perturber exists with M p > 3000 MJ within a = 11.2 au of the parent star.
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