论文标题
搜索HATS-18行星系统中的公交时机变化
A search for transit timing variations in the HATS-18 planetary system
论文作者
论文摘要
Hats-18b是一个具有较大质量和短轨道时期的过境行星，是检测潮汐作用引起的轨道衰变的最佳候选者之一。我们提出了帽子-18的广泛光度法，从中测量了27倍的中期透射。从过渡系外行星调查卫星（TESS）的数据中测量了两个进一步的过境时间，另外三个从文献中获取。过境时机与线性和二次胚层拟合，并确定轨道衰减的上限。这对应于修改的恒星潮汐质量因子的下限为$ q_ \ star^{\，\ prime}> 10^{5.11 \ pm 0.04} $。这是在限制由于内部重力波造成的增强潮汐耗散的存在的尖端。我们还完善了HATS-18系统的测量物理特性，将上限放在第三身体的质量上，并比较苔丝和1.54-m丹麦望远镜在测量该系统的运输时间方面的相对性能。
HATS-18b is a transiting planet with a large mass and a short orbital period, and is one of the best candidates for the detection of orbital decay induced by tidal effects. We present extensive photometry of HATS-18 from which we measure 27 times of mid-transit. Two further transit times were measured from data from the Transiting Exoplanet Survey Satellite (TESS) and three more taken from the literature. The transit timings were fitted with linear and quadratic ephemerides and an upper limit on orbital decay was determined. This corresponds to a lower limit on the modified stellar tidal quality factor of $Q_\star^{\,\prime} > 10^{5.11 \pm 0.04}$. This is at the cusp of constraining the presence of enhanced tidal dissipation due to internal gravity waves. We also refine the measured physical properties of the HATS-18 system, place upper limits on the masses of third bodies, and compare the relative performance of TESS and the 1.54-m Danish Telescope in measuring transit times for this system.
