AU显微镜星b与c的凌星计时变化
摘要
我们探究年轻(22 Myr)邻近AU Mic行星系统的凌星计时变化(TTVs)。对于AU Mic b，我们引入三次Spitzer(4.5 μm)凌星、五次TESS凌星、11次LCO凌星、一次PEST凌星、一次Brierfield凌星，以及两次来自Rossiter-McLaughlin观测的凌星计时测量；对于AU Mic c，我们引入三次TESS凌星。我们给出两项独立的TTV分析。首先，我们使用EXOFASTv2联合建模Spitzer与地面凌星并获得中点凌星时刻。随后我们构建O–C图并用Exo-Striker建模TTVs。其次，我们用独立的光动力分析复现结果。我们得到AU Mic c的TTV质量为10.8^{+2.3}_{-2.2} M_E。我们将TTV推导的约束与近期径向速度(RV)质量测定进行比较。我们还观测到额外的TTVs，其似乎并非仅由b与c的动力学相互作用所致，也非来自黑子或耀斑。因此，我们提出一个假想的非凌星“中间-d”候选系外行星，其与观测TTVs、候选RV信号一致，并将AU Mic系统确立为具有4:6:9周期通约的紧凑共振多行星链。这些结果表明AU Mic行星系统存在动力学相互作用并产生可探测TTVs，其所隐含的轨道动力学或可揭示该年轻系统的形成机制。我们建议未来对AU Mic b与c进行RV与TTV观测，以进一步约束质量并确认可能存在的额外行星。
引用
@article{arxiv.2202.05813,
title = {Transit Timing Variations for AU Microscopii b & c},
author = {Justin M. Wittrock and Stefan Dreizler and Michael A. Reefe and Brett M. Morris and Peter P. Plavchan and Patrick J. Lowrance and Brice-Olivier Demory and James G. Ingalls and Emily A. Gilbert and Thomas Barclay and Bryson L. Cale and Karen A. Collins and Kevin I. Collins and Ian J. M. Crossfield and Diana Dragomir and Jason D. Eastman and Mohammed El Mufti and Dax Feliz and Jonathan Gagne and Eric Gaidos and Peter Gao and Claire S. Geneser and Leslie Hebb and Christopher E. Henze and Keith D. Horne and Jon M. Jenkins and Eric L. N. Jensen and Stephen R. Kane and Laurel Kaye and Eder Martioli and Teresa A. Monsue and Enric Palle and Elisa V. Quintana and Don J. Radford and Veronica Roccatagliata and Joshua E. Schlieder and Richard P. Schwarz and Avi Shporer and Keivan G. Stassun and Christopher Stockdale and Thiam-Guan Tan and Angelle M. Tanner and Andrew Vanderburg and Laura D. Vega and Songhu Wang},
journal= {arXiv preprint arXiv:2202.05813},
year = {2022}
}
备注
Corrected typos; revised Section 3, 4, and 5 to reflect reanalysis, results unchanged. Submitted to AAS Journals Nov 11th, 2020; favorable referee report received Jan 3rd; final draft accepted for publication in the AJ Apr 19th