The K2 and TESS Synergy. I. Updated Ephemerides and Parameters for K2-114, K2-167, K2-237, and K2-261
Mma Ikwut-Ukwa, Joseph E. Rodriguez, Allyson Bieryla, Andrew Vanderburg, Teo Mocnik, Stephen R. Kane, Samuel N. Quinn, Knicole D. Colón, George Zhou, Jason D. E… 展开作者
Mma Ikwut-Ukwa, Joseph E. Rodriguez, Allyson Bieryla, Andrew Vanderburg, Teo Mocnik, Stephen R. Kane, Samuel N. Quinn, Knicole D. Colón, George Zhou, Jason D. Eastman, Chelsea X. Huang, David W. Latham, Jessie Dotson, Jon M. Jenkins, George R. Ricker, Sara Seager, Roland K. Vanderspek, Joshua N. Winn, Thomas Barclay, Geert Barentsen, Zachory Berta-Thompson, David Charbonneau, Diana Dragomir, Tansu Daylan, Maximilian Gunther, Christina Hedges, Christopher E. Henze, Scott McDermott, Joshua E. Schlieder, Elisa V. Quintana, Jeffrey C. Smith, Joseph D. Twicken, Daniel A. Yahalomi
Although the Transiting Exoplanet Survey Satellite (TESS) primary mission observed the northern and southern ecliptic hemispheres, generally avoiding the ecliptic, and the Kepler space telescope during the K2 mission could only observe near the ecliptic, many of the K2 fields extend far enough from the ecliptic plane that sections overlap with TESS fields. Using photometric observations from both K2 and TESS, combined with archival spectroscopic observations, we globally modeled four known planetary systems discovered by K2 that were observed in the first year of the primary TESS mission. Specifically, we provide updated ephemerides and system parameters for K2-114 b, K2-167 b, K2-237 b, and K2-261 b. These were some of the first K2 planets to be observed by TESS in the first year and include three Jovian sized planets and a sub-Neptune with orbital periods less than 12 days. In each case, the updated ephemeris significantly reduces the uncertainty in prediction of future times of transit, which is valuable for planning observations with the James Webb Space Telescope and other future facilities. The TESS extended mission is expected to observe about half of the K2 fields, providing the opportunity to perform this type of analysis on a larger number of systems.
V1298 Tau with TESS: Updated Ephemerides, Radii, and Period Constraints from a Second Transit of V1298 Tau e
金牛座V1298是一颗年轻的K型恒星，拥有四颗大小介于0.5 - 0.9 $R_J$之间的凌日系外行星。考虑到该系统的年轻，它提供了一个独特的机会来了解行星半径在同一恒星环境中不同距离的演变。V1298 Tau最初于6年前在K2 Campaign 4期间被观测到。现在，V1298 Tau在美国宇航局的凌日系外行星调查卫星（TESS）的延长任务中被重新观察到。在这里，我们从10分钟的TESS全帧图像中对V1298 Tau进行了新的光度观测。我们使用TESS数据更新V1298 Tau bcd的星历表，并将新观察到的半径与从K2光变曲线测量的半径进行比较，在$1-2σ$水平上，在更红的TESS带通中发现V1298 Tau bcd的较浅的凌日。我们怀疑半径上的差异是由于星点交叉事件或来自附近与V1298 Tau相同像素的暗淡恒星的污染。此外，我们赶上了第二次过境V1298头e，并提出了一种新的方法来推导一个行星的周期从两个过境观察年的边缘后验概率。我们发现V1298 Tau e的最高概率周期与V1298 Tau b处于近2：1的平均运动共振，如果得到证实，可能使V1298 Tau bcde成为4行星共振链。V1298 Tau是几个正在进行和未来观测的目标。这些更新的星历表对于安排未来的过境观测和解释未来的多普勒层析成像或透射光谱信号至关重要。
TESS's First Bound Microlensing Planet: A Binary Microlensing Event Revealing a Planetary Companion toward the Galactic Plane
University of New Mexico（新墨西哥大学）；Université Marie et Louis Pasteur, CNRS, Institut UTINAM UMR 6213（玛丽和路易斯·巴斯德大学，法国国家科学研究中心，UTINAM研究所）；Texas Tech University（德克萨斯理工大学）；The Ohio State University（俄亥俄州立大学）
Ephemeris Refinement for Qatar-4 b, HAT-P-18 b, and CoRoT-1 b with Small Telescope and TESS Observations
Arizona State University（亚利桑那州立大学）；NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics Laboratory (Code 667)（NASA戈达德太空飞行中心系外行星与恒星天体物理学实验室）
RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600
Tsinghua University（清华大学）；Nanjing University（南京大学）；The University of New Mexico（新墨西哥大学）；University of Chicago（芝加哥大学）；University of Arizona（亚利桑那大学）；Peking University（北京大学）；Westlake University（西湖大学）
