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arXiv 2609.38315astro-ph.EP

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。

Gurmeher Kathuria, Luke G. Bouma, Andrew W. Boyle, Roberto Tejada Arevalo, Andrew W. Mann, Nidia Morrell, Karen A. Collins, R. Paul Butler, Stephen A. Shectman,… 展开作者

Gurmeher Kathuria, Luke G. Bouma, Andrew W. Boyle, Roberto Tejada Arevalo, Andrew W. Mann, Nidia Morrell, Karen A. Collins, R. Paul Butler, Stephen A. Shectman, Johanna Teske, Jeffrey D. Crane, Shreyas Vissapragada, Madeleine Mckenzie, Khalid Barkaoui, Norio Narita, Akihiko Fukui, Jerome P. De Leon, Toshi Suganuma, Madyson G. Barber, Francis P. Wilkin, Victoria Zaledonis, Sophia Garcia-Gallet, Glauk Hizmo, Steve B. Howell, David R. Ciardi, Colin Littlefield, Sarah Deveny, Douglas A. Caldwell

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.

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