论文标题
WASP-128B的新轨道滨海
A new orbital ephemeris for WASP-128b
论文作者
论文摘要
WASP-128是一个相对明亮的（v = 12.37）G0 warf，已知在短期轨道中托有一个过境的棕色矮人（Hodžić等，2018 Arxiv：1807.07557（H18））。很少有这样的物体已知，这使WASP-128成为进一步观察的主要目标，以更好地了解巨型行星 /棕色矮人的特性，包括形成和迁移历史。为了促进WASP-128B未来观察结果的规划，我们使用TESS观察到的WASP-128的七个过渡，改善了系统的轨道灭菌。我们注意到，我们的轨道周期与H18的轨道周期大不相同：它超过$ 14 \，σ$（使用它们的不确定性）。这导致我们的阵地预测2020年代中期的过境比H18 ephemeris晚了将近八个小时。但是，我们发现没有任何时期变化的证据。
WASP-128 is a relatively bright (V= 12.37) G0-dwarf, known to host a transiting brown dwarf in a short-period orbit (Hodžić et al. 2018 arXiv:1807.07557 (H18)). Very few such objects are known, which makes WASP-128 a prime target for further observations to better understand giant planet / brown dwarf properties,including formation and migration histories. To facilitate the planning of future observations of WASP-128b, we improve the orbital ephemeris of the system, by using the seven transits of WASP-128 observed by TESS. We note that our orbital period differs significantly from that of H18: it is more than $14\,σ$ (using their uncertainty) larger. This results in our ephemeris predicting a mid-2020 transit to occur almost eight hours later than the H18 ephemeris. We find, however, no evidence for any period variation.
