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Multiple Transits during a Single Conjunction: Identifying Transiting Circumbinary Planetary Candidates from TESS
The Astronomical Journal ( IF 5.1 ) Pub Date : 2020-09-21 , DOI: 10.3847/1538-3881/abad40
Veselin B. Kostov 1, 2 , William F. Welsh 3 , Nader Haghighipour 4 , Billy Quarles 5 , Eric Agol 6 , Laurance Doyle 2 , Daniel C. Fabrycky 7 , Gongjie Li 5 , David V. Martin 7 , Sean Mills 8 , Tsevi Mazeh 9 , Jerome A. Orosz 3 , Brian P. Powell 1
Affiliation  

We present results of a study on identifying circumbinary planet candidates that produce multiple transits during one conjunction with eclipsing binary systems. The occurrence of these transits enables us to estimate the candidates' orbital periods, which is crucial as the periods of the currently known transiting circumbinary planets are significantly longer than the typical observational baseline of the Transiting Exoplanet Survey Satellite (TESS). Combined with the derived radii, it also provides valuable information needed for follow-up observations and subsequent confirmation of a large number of circumbinary planet candidates from TESS. Motivated by the discovery of the 1108 day circumbinary planet Kepler-1647, we show the application of this technique to four of Kepler's circumbinary planets that produce such transits. Our results indicate that in systems where the circumbinary planet is on a low-eccentricity orbit, the estimated planetary orbital period is within <10%–20% of the true value. This estimate is derived from photometric observations spanning less than 5% of the planet's period, demonstrating the strong capability of the technique. Capitalizing on the current and future eclipsing binaries monitored by NASA's TESS mission, we estimate that hundreds of circumbinary planet candidates producing multiple transits during one conjunction will be detected in the TESS data. Such a large sample will enable statistical understanding of the population of planets orbiting binary stars and shed new light on their formation and evolution.

中文翻译:

单一合相期间的多次凌日:从 TESS 中识别凌日环绕行星候选者

我们展示了一项研究的结果,该研究确定在与食双星系统的一次结合期间产生多次凌日的环绕双星候选行星。这些凌日的发生使我们能够估计候选者的轨道周期,这是至关重要的,因为目前已知的凌日环绕双星行星的周期明显长于凌日系外行星测量卫星 (TESS) 的典型观测基线。结合导出的半径,它还为后续观测和随后确认来自 TESS 的大量双环行星候选者提供了有价值的信息。受发现 1108 天的环绕双星行星 Kepler-1647 的启发,我们展示了这种技术在开普勒的四颗产生此类凌日的环绕行星上的应用。我们的结果表明,在环绕双星行星处于低偏心率轨道的系统中,估计的行星轨道周期在真实值的 <10%–20% 内。这一估计是从占行星周期不到 5% 的光度观测得出的,证明了该技术的强大能力。利用美国宇航局 TESS 任务监测的当前和未来的食双星,我们估计在 TESS 数据中将检测到数百个在一次会合期间产生多次凌日的环绕双星候选行星。如此大的样本将使人们能够对围绕双星运行的行星数量进行统计理解,并为它们的形成和演化提供新的线索。估计的行星轨道周期在真实值的 <10%–20% 内。这一估计是从占行星周期不到 5% 的光度观测得出的,证明了该技术的强大能力。利用美国宇航局 TESS 任务监测的当前和未来的食双星,我们估计在 TESS 数据中将检测到数百个在一次会合期间产生多次凌日的环绕双星候选行星。如此大的样本将使人们能够对围绕双星运行的行星数量进行统计理解,并为它们的形成和演化提供新的线索。估计的行星轨道周期在真实值的 <10%–20% 内。这一估计是从占行星周期不到 5% 的光度观测得出的,证明了该技术的强大能力。利用美国宇航局 TESS 任务监测的当前和未来的食双星,我们估计在 TESS 数据中将检测到数百个在一次会合期间产生多次凌日的环绕双星候选行星。如此大的样本将使人们能够对围绕双星运行的行星数量进行统计理解,并为它们的形成和演化提供新的线索。利用美国宇航局 TESS 任务监测的当前和未来的食双星,我们估计在 TESS 数据中将检测到数百个在一次会合期间产生多次凌日的环绕双星候选行星。如此大的样本将使人们能够对围绕双星运行的行星数量进行统计理解,并为它们的形成和演化提供新的线索。利用美国宇航局 TESS 任务监测的当前和未来的食双星,我们估计在 TESS 数据中将检测到数百个在一次会合期间产生多次凌日的环绕双星候选行星。如此大的样本将使人们能够对围绕双星运行的行星数量进行统计理解,并为它们的形成和演化提供新的线索。
更新日期:2020-09-21
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