L 98-59 系统：一颗邻近 M 矮星周围的三颗凌星类地行星
地球与行星天体物理
2019-07-10 v2
摘要
我们报告凌星系外行星巡天卫星（TESS）发现三颗类地尺寸行星凌星 L 98-59（TOI-175，TIC 307210830）——一颗距离 10.6 pc 的明亮 M 矮星。利用 Gaia 测得的距离与宽波段测光，我们发现宿主恒星为 M3 矮星。结合来自三个扇区的 TESS 凌星数据，相应的恒星参数给出行星半径范围为 0.8 R⊕ 至 1.6 R⊕。三颗行星均具有短轨道周期，范围从 2.25 到 7.45 天，外侧一对刚好宽于 2:1 周期共振。TESS 数据验证报告与审查软件包 DAVE 所产生的诊断测试排除了常见的假阳性来源。这些分析，连同专门的后续观测以及该系统的多行星特征，使人相信所观测信号由凌星 L 98-59 的行星引起，而非来自视场中其他源。L 98-59 系统因若干原因而引人关注：宿主恒星明亮（V = 11.7 mag，K = 7.1 mag）且这些行星是进一步后续观测的优选目标，包括精密视向速度质量测量以及未来用詹姆斯·韦伯空间望远镜进行凌星光谱观测；近共振构型使该系统成为研究行星系统动力学演化的实验室；同一系统中尺寸相对相似的三颗行星提供了研究类地行星的机会，其中其他变量（年龄、金属丰度等）可保持恒定。L 98-59 将在另外 4 个 TESS 扇区中被观测，这将为三颗目前已知行星提供丰富信息，并有可能揭示该系统中额外的行星。
引用
@article{arxiv.1903.08017,
title = {The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf},
author = {Veselin B. Kostov and Joshua E. Schlieder and Thomas Barclay and Elisa V. Quintana and Knicole D. Colon and Jonathan Brande and Karen A. Collins and Adina D. Feinstein and Samuel Hadden and Stephen R. Kane and Laura Kreidberg and Ethan Kruse and Christopher Lam and Elisabeth Matthews and Benjamin T. Montet and Francisco J. Pozuelos and Keivan G. Stassun and Jennifer G. Winters and George Ricker and Roland Vanderspek and David Latham and Sara Seager and Joshua Winn and Jon M. Jenkins and Dennis Afanasev and James J. D. Armstrong and Giada Arney and Patricia Boyd and Geert Barentsen and Khalid Barkaoui and Natalie E. Batalha and Charles Beichman and Daniel Bayliss and Christopher Burke and Artem Burdanov and Luca Cacciapuoti and Andrew Carson and David Charbonneau and Jessie Christiansen and David Ciardi and Mark Clampin and Kevin I. Collins and Dennis M. Conti and Jeffrey Coughlin and Giovanni Covone and Ian Crossfield and Laetitia Delrez and Shawn Domagal-Goldman and Courtney Dressing and Elsa Ducrot and Zahra Essack and Mark E. Everett and Thomas Fauchez and Daniel Foreman-Mackey and Tianjun Gan and Emily Gilbert and Michael Gillon and Erica Gonzales and Aaron Hamann and Christina Hedges and Hannah Hocutt and Kelsey Hoffman and Elliott P. Horch and Keith Horne and Steve Howell and Shane Hynes and Michael Ireland and Jonathan M. Irwin and Giovanni Isopi and Eric L. N. Jensen and Emmanuel Jehin and Lisa Kaltenegger and John F. Kielkopf and Ravi Kopparapu and Nikole Lewis and Eric Lopez and Jack J. Lissauer and Andrew W. Mann and Franco Mallia and Avi Mandell and Rachel A. Matson and Tsevi Mazeh and Teresa Monsue and Sarah E. Moran and Vickie Moran and Caroline V. Morley and Brett Morris and Philip Muirhead and Koji Mukai and Susan Mullally and Fergal Mullally and Catriona Murray and Norio Narita and EnricP alle and Daria Pidhorodetska and David Quinn and Howard Relles and Stephen Rinehart and Matthew Ritsko and Joseph E. Rodriguez and Pamela Rowden and Jason F. Rowe and Daniel Sebastian and Ramotholo Sefako and Sahar Shahaf and Avi Shporer and Naylynn Tanon Reyes and Peter Tenenbaum and Eric B. Ting and Joseph D. Twicken and Gerard T. van Belle and Laura Vega and Jeffrey Volosin and Lucianne M. Walkowicz and Allison Youngblood},
journal= {arXiv preprint arXiv:1903.08017},
year = {2019}
}
备注
27 pages, 22 figures, AJ accepted