论文标题
WASP-161b的过时时间变化的暂定证据
Tentative Evidence for Transit Timing Variations of WASP-161b
论文作者
论文摘要
我们通过使用TESS数据和档案数据的组合报告WASP-161B的过时时间变化（TTV）的检测。苔丝数据中的过渡的中点被$ \ sim $ \ sim $ 67分钟，而$ \ sim $ \ sim在2021年1月，基于以前的工作中出版的埃弗默里斯（Ephemeris）。我们能够从档案光曲线（SSO-Europa; 2018年1月）重现运输时机，并找到SSO-Europa时机与在恒定的时期假设下已发表的Ephemeris一致。相反，我们发现SSO-europa中点中点表明，与从苔丝时机获得的预测相比，在4.40 $σ$时的6.62分钟变化以及恒定的轨道周期假设。 TTV可以用二次函数进行建模，从而产生恒定的周期变化。周期派生$ \ dot {p} $是-1.16 $ \ times $ 10 $^{ - 7} \ pm $ 2.25 $ \ times $ 10 $^{ - 8} $每天（或$ -3.65 $ s/Years），源自SSO-Europa和Tess的计时。包括衰减时期和Apsidal进攻在内的不同情况可能会解释这些TTV，但它们都引入了某些不一致之处。我们在2022年1月获得了两次过渡的Cheops观测，以区分不同的TTV方案。与SSO-Europa和Tess预测的时机相比，我们预计时机会变化5分钟。
We report on the detection of transit timing variations (TTV) of WASP-161b by using the combination of TESS data and archival data. The midpoint of the transits in TESS data are offset by $\sim$67 minutes in Jan. 2019, and $\sim$203 minutes in Jan. 2021, based on the ephemeris published in previous work. We are able to reproduce the transit timings from the archival light curve (SSO-Europa; Jan. 2018) and find SSO-Europa timing is consistent with the published ephemeris under a constant period assumption. Conversely, we find that the SSO-Europa transit midpoint indicates a 6.62-minute variation at 4.40 $σ$ compared to the prediction obtained from TESS timings, and a constant orbit period assumption. The TTVs could be modeled with a quadratic function, yielding a constant period change. The period derivative $\dot{P}$ is -1.16$\times$10$^{-7}\pm$2.25$\times$10$^{-8}$ days per day (or $-3.65$ s/year), derived from SSO-Europa and TESS timing. Different scenarios, including a decaying period and apsidal precession can potentially explain these TTVs but they both introduce certain inconsistencies. We have obtained CHEOPS observations for two transits in Jan. 2022 to distinguish between different TTV scenarios. We expect the timing to vary by 5 minutes, compared to the timing predicted from SSO-Europa and TESS with a constant period assumption.
