Aliasing in the Radial Velocities of YZ Ceti: An Ultra-short Period for YZ Ceti c?

Aliasing in the Radial Velocities of YZ Ceti: An Ultra-short Period for YZ Ceti c?
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YZ Ceti 径向速度的混叠:YZ Ceti c 的超短周期?

DOI:
10.3847/2041-8213/aadc0b
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发表时间:
2018
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
P. Robertson
P. Robertson
中科院分区:
--
文献类型:
--
作者:
P. Robertson

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中晚期M星是研究凌日中低质量系外行星的机会目标,因为它们的行星与恒星的半径比很高。最近对此类恒星的研究表明,与早期 M 型恒星一样,它们经常拥有小行星的多重共振网络。在这里,我重新分析了 YZ Ceti 的径向速度测量值,这是一颗活跃的 M4 矮星,HARPS 系外行星巡天最近在短周期(P = 4.66、3.06、1.97 天)轨道上发现了三颗系外行星。我的分析发现,内部两颗行星的轨道周期不能使用已发布的 HARPS 速度唯一确定。特别是,YZ Ceti c 的 3.06 天周期很可能是一个别名,而其真实周期是 0.75 天。如果是这样,修正后的该行星的最小质量将小于 0.6 个地球质量,其几何凌日概率将增加至 10%。我鼓励进行更多观测以确定 YZ Ceti b 和 c 的真实周期,并建议在 TESS 光变曲线中搜索 0.75 天周期的凌星。
Mid-to-late M stars are opportunistic targets for the study of low-mass exoplanets in transit because of the high planet-to-star radius ratios of their planets. Recent studies of such stars have shown that, like their early-M counterparts, they often host multi-resonant networks of small planets. Here, I reanalyze radial velocity measurements of YZ Ceti, an active M4 dwarf for which the HARPS exoplanet survey recently discovered three exoplanets on short-period (P = 4.66, 3.06, 1.97 days) orbits. My analysis finds that the orbital periods of the inner two planets cannot be uniquely determined using the published HARPS velocities. In particular, it appears likely that the 3.06 day period of YZ Ceti c is an alias and that its true period is 0.75 days. If so, the revised minimum mass of this planet is less than 0.6 Earth masses and its geometric transit probability increases to 10%. I encourage additional observations to determine the true periods of YZ Ceti b and c and suggest a search for transits at the 0.75 day period in TESS light curves.
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DOI: 10.1117/12.2231880
发表时间: 2016
期刊:
影响因子: --
作者:
Quirrenbach;Caballero
通讯作者: Caballero
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DOI: 10.1088/1538-3873/aaaaa8
发表时间: 2018
影响因子: 3.5
作者:
Fulton, Benjamin J.;Petigura, Erik A.;Blunt, Sarah;Sinukoff, Evan
通讯作者: Sinukoff, Evan