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arXiv 2103.03259astro-ph.EP
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用TESS重访开普勒场:用TESS 2分钟数据改进星历

Revisiting the Kepler field with TESS: Improved ephemerides using TESS 2min data

Matthew P. Battley, Michelle Kunimoto, David J. Armstrong, Don Pollacco

摘要:

随着系外行星科学从探测系外行星转向深入描述其结构和大气层,最新的行星星历变得越来越重要。在这项工作中,更新了22颗开普勒行星和4颗开普勒行星候选者的星历表,构成了TESS 2 min数据集中具有足够信噪比的所有开普勒行星和候选者。一个纯粹的测光方法是利用这里允许更新的行星星历表,即使他们不显着的径向速度数据。所获得的星历是非常高的精度和至少七年的“新鲜”比档案星历。特别是,Kepler-411 d,Kepler-538 b和候选人K00075.01/K00076.01的周期不确定性显着降低。所有对象都生成了O-C图,这里讨论了最有趣的对象。我们也尝试了对五个已知的多行星系统(开普勒-18、开普勒-25、开普勒-51、开普勒-89和开普勒-396)进行更新的TTV拟合,但这些系统在TESS中相对稀少和模糊。尽管有这些困难,TESS再次证明自己是一个令人难以置信的强大的后续仪器,以及行星发现者本身。本文所用的方法扩展到30分钟节奏TESS数据和TESS扩展任务有可能产生更新的星历数百个系统在未来。

英文摘要:

Up to date planet ephemerides are becoming increasingly important as exoplanet science moves from detecting exoplanets to characterising their architectures and atmospheres in depth. In this work ephemerides are updated for 22 Kepler planets and 4 Kepler planet candidates, constituting all Kepler planets and candidates with sufficient signal to noise in the TESS 2min dataset. A purely photometric method is utilised here to allow ephemeris updates for planets even when they do not posses significant radial velocity data. The obtained ephemerides are of very high precision and at least seven years 'fresher' than archival ephemerides. In particular, significantly reduced period uncertainties for Kepler-411d, Kepler-538b and the candidates K00075.01/K00076.01 are reported. O-C diagrams were generated for all objects, with the most interesting ones discussed here. Updated TTV fits of five known multiplanet systems with significant TTVs were also attempted (Kepler-18, Kepler-25, Kepler-51, Kepler-89, and Kepler-396), however these suffered from the comparative scarcity and dimness of these systems in TESS. Despite these difficulties, TESS has once again shown itself to be an incredibly powerful follow-up instrument as well as a planet-finder in its own right. Extension of the methods used in this paper to the 30min-cadence TESS data and TESS extended mission has the potential to yield updated ephemerides of hundreds more systems in the future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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