天蝎-半人马星协中的一个婴儿亚土星
An Infant Sub-Saturn in Scorpius-Centaurus
- University of California, Los Angeles(加州大学洛杉矶分校)
- Caltech/IPAC(加州理工学院/IPAC)
- Carnegie Science Observatories(卡内基科学天文台)
- The University of North Carolina at Chapel Hill(北卡罗来纳大学教堂山分校)
- Department of Physics and Astronomy, The University of North Carolina at Chapel Hill(北卡罗来纳大学教堂山分校物理与天文学系)
- Department of Astronomy and Astrophysics, University of California, Santa Cruz(加州大学圣克鲁斯分校天文与天体物理学系)
- Department of Astrophysical Sciences, Princeton University(普林斯顿大学天体物理科学系)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
本文发现并验证了天蝎-半人马星协中围绕前主序M矮星运行的凌星行星TIC 88297141 Ab,其半径约7.21地球半径,周期4.64天,年龄约1560万年,为研究年轻行星性质提供了样本。
AI中文摘要:
我们报告了TIC 88297141 Ab的发现与验证,这是一颗围绕前主序M矮星(0.31太阳质量,0.74太阳半径)运行的行星,位于天蝎-半人马OB星协中。星协成员资格表明其年龄为$15.6 \pm 1.6$ Myr,锂元素和等时线年龄测定支持这一结论。我们使用专为变星设计的定制管道检测到了TESS凌星信号,并利用地面测光(LCO/Swope和LCOGT/Sinistro)确认了信号的星上性质。我们对凌星和恒星活动的全球拟合给出了4.64天的轨道周期和$7.21 \pm 0.32$地球半径(0.64木星半径)的行星半径。该恒星有一个共动的M矮星伴星(0.4太阳半径),投影间距为$260$ au;斑点成像(Gemini-S/Zorro)未发现额外的恒星伴星,来自Magellan/PFS的径向速度与恒星活动一致,给出$M_p \sin i < 4.7$木星质量($2\sigma$)。统计验证分析得出假阳性概率为$10^{-5}$,从而验证了该行星。质量测量将确定TIC 88297141 Ab是像其他同龄同类尺寸行星那样的低密度超级蓬松行星,还是对于其半径而言异常巨大的行星。
英文摘要:
We report the discovery and validation of TIC 88297141 Ab, a transiting planet orbiting a pre-main-sequence M dwarf (0.31 solar masses, 0.74 solar radii) in the Scorpius-Centaurus OB association. Group membership implies an age of $15.6 \pm 1.6$ Myr, supported by lithium and isochrone age-dating. We detected the TESS transits using a custom pipeline designed for variable stars and used ground-based photometry (LCO/Swope and LCOGT/Sinistro) to confirm the on-target nature of the signal. Our global fit of the transits and stellar activity gives an orbital period of 4.64 days and a planet radius of $7.21 \pm 0.32$ Earth radii (0.64 Jupiter radii). The star has a comoving M-dwarf companion (0.4 solar radii) at a projected separation of $260$ au; speckle imaging (Gemini-S/Zorro) reveals no additional stellar companions, and radial velocities from Magellan/PFS are consistent with stellar activity, giving $M_p \sin i < 4.7$ Jupiter masses at $2σ$. A statistical validation analysis yields a false positive probability of $10^{-5}$, validating the planet. A mass measurement will determine whether TIC 88297141 Ab is a low-density super-puff, like other comparably sized planets at these ages, or an unusually massive planet for its radius.