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arXiv 2111.03346astro-ph.EP
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行星WASP-43 b的轨道衰变和全球模拟研究

Investigation of an orbital decay and global modeling of the planet WASP-43 b

Fatemeh Davoudi, Özgür Baştürk, Selçuk Yalçınkaya, Ekrem M. Esmer, Hossein Safari

摘要:

WASP-43 b是探测轨道衰变的最重要候选者之一。我们调查件的证据,这种预期的变化,其过境时间,根据地面和空间观测。该数据集包括土耳其TUBITAK国家天文台和凌日系外行星勘测卫星(TESS)的凌日观测。我们提出了一个全球模型的系统,最精确的测光从空间,地面和档案径向速度数据的基础上。使用均匀化的数据集和模型化的光变曲线,我们测量了WASP-43 b的中渡越时间。我们的分析同意一个线性星历,我们完善的轻元素,为未来的观测系统。然而,从两个扇区(9和35)的TESS数据得出的过境时间之间存在负差,并且在整个数据集中暗示轨道周期减少。由于观测基线较短,这两项发现在统计上都不重要,这使我们无法对这颗超短周期行星的轨道衰变得出确切的结论。然而,假设行星轨道周期减小的影响,我们导出约化潮汐品质因数的下限为Q '* >(4.01 + 1.15)。10^5的最佳拟合二次函数。最后,我们根据TESS光变曲线中因斑点调制而产生的凌日外通量变化计算出该系统可能的旋转周期为7.52天。

英文摘要:

WASP-43 b is one of the most important candidates for detecting an orbital decay. We investigate pieces of evidence for this expectation as variations in its transit timings, based on the ground and space observations. The data set includes the transit observations at the TUBITAK National Observatory of Turkey and Transiting Exoplanet Survey Satellite (TESS). We present a global model of the system, based on the most precise photometry from space, ground, and archival radial velocity data. Using the homogenized data set and modeled light curves, we measure the mid-transit times for WASP-43 b. Our analysis agrees with a linear ephemeris for which we refine the light elements for future observations of the system. However, there is a negative difference between the transit timings derived from TESS data in two sectors (9 and 35) and a hint of an orbital period decrease in the entire data set. Both findings are statistically insignificant due to the short baseline of observations, which prevents us from drawing firm conclusions about the orbital decay of this ultra-short-period planet. However, assuming the effect of this decrease of the period in the planet's orbit, we derive a lower limit for the reduced tidal quality factor as Q'_* > (4.01 +_ 1.15). 10^5 from the best-fitting quadratic function. Finally, we calculate a probable rotational period for this system as 7.52 days from the out-of-transit flux variation in the TESS light curves due to spot modulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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