论文标题
Tess-Keck调查。 xi。四个旋转k矮人toi-1246的四个过渡子核的质量测量
The TESS-Keck Survey. XI. Mass Measurements for Four Transiting sub-Neptunes orbiting K dwarf TOI-1246
论文作者
论文摘要
多行星系统是研究系外行星体系结构和比较行星兄弟姐妹的宝贵领域。 TOI-1246就是一个这样的系统，具有适度明亮的k dwarf（$ \ rm {v = 11.6，〜k = 9.9} $），苔丝鉴定出四个过渡子neptunes，其轨道周期为$ 4.31〜 \ rm {d}，〜5.90〜5.90〜 \ rm {$ rm {$ rm {D}，〜18.66， $ 〜37.92〜 \ rm {d} $。我们用凯克/雇用和tng/harps-n收集了130个径向速度观察，以测量行星质量。我们将14个苔丝光度法的14个部门置于精炼行星半径（$ \ rm {2.97 \ pm 0.06〜r_ \ oplus}，\ rm {2.47 \ pm 0.08〜r_ \ r_ \ oplus}，\ rm {3.46 \ pm 0.09 〜r_ r _ r _ r _ r _ r _ r _ 3.72 0.16〜r_ \ oplus} $），并确认四个行星。我们发现，TOI-1246 E比三个内部行星（$ \ rm {8.1 \ pm 1.1 m_ \ oplus} $，$ \ rm {8.8 \ pm 1.2 m_ \ oplus} $，$ \ rm {8.1 \ pm 1.1 m_ \ oplus} $，$ \ pm 1.2 m_ \ oplus} $，$ \ rm \ rm {5.3 \ pm 1.7 m_ \ pm 1.7 m_ \ oplus} $ 2.3 m_ \ oplus} $）。两个外行星TOI-1246 D和TOI-1246 E靠近2：1共振（$ \ rm {p_ {e}/p_ {d} = 2.03} $），并且展示了传输时机变化。 TOI-1246是最亮的四人星际系统之一，使其适合继续观察。它是所有四个过境行星的六个系统之一，具有测量质量和半径。行星的密度从$ \ rm {0.70 \ pm 0.24} $到$ 3.21 \ pm 0.44 \ rm {g/cm^3} $，这意味着一系列散装和大气组成。我们还报告了在RV数据中发现的第五个行星候选者，最低质量为25.6 $ \ pm $ 3.6 $ \ rm {m_ \ oplus} $。该行星候选者是TOI-1246 E的外部，候选时间为93.8 d，我们讨论是否确认其本质上是行星的含义。
Multi-planet systems are valuable arenas for investigating exoplanet architectures and comparing planetary siblings. TOI-1246 is one such system, with a moderately bright K dwarf ($\rm{V=11.6,~K=9.9}$) and four transiting sub-Neptunes identified by TESS with orbital periods of $4.31~\rm{d},~5.90~\rm{d},~18.66~\rm{d}$, and $~37.92~\rm{d}$. We collected 130 radial velocity observations with Keck/HIRES and TNG/HARPS-N to measure planet masses. We refit the 14 sectors of TESS photometry to refine planet radii ($\rm{2.97 \pm 0.06~R_\oplus},\rm{2.47 \pm 0.08~R_\oplus}, \rm{3.46 \pm 0.09~R_\oplus}$, $\rm{3.72 \pm 0.16~R_\oplus}$), and confirm the four planets. We find that TOI-1246 e is substantially more massive than the three inner planets ($\rm{8.1 \pm 1.1 M_\oplus}$, $\rm{8.8 \pm 1.2 M_\oplus}$, $\rm{5.3 \pm 1.7 M_\oplus}$, $\rm{14.8 \pm 2.3 M_\oplus}$). The two outer planets, TOI-1246 d and TOI-1246 e, lie near to the 2:1 resonance ($\rm{P_{e}/P_{d}=2.03}$) and exhibit transit timing variations. TOI-1246 is one of the brightest four-planet systems, making it amenable for continued observations. It is one of only six systems with measured masses and radii for all four transiting planets. The planet densities range from $\rm{0.70 \pm 0.24}$ to $3.21 \pm 0.44 \rm{g/cm^3}$, implying a range of bulk and atmospheric compositions. We also report a fifth planet candidate found in the RV data with a minimum mass of 25.6 $\pm$ 3.6 $\rm{M_\oplus}$. This planet candidate is exterior to TOI-1246 e with a candidate period of 93.8 d, and we discuss the implications if it is confirmed to be planetary in nature.
