论文标题
NeID揭示了年轻的Neptune Toi-2076 B的倾斜度低
NEID Reveals that The Young Warm Neptune TOI-2076 b Has a Low Obliquity
论文作者
论文摘要
TOI-2076 b是一个亚北极大小的行星（$ r = 2.39 \ pm 0.10 {r_ \ oplus} $），它传递了一个年轻的（$ 204 \ pm 50 {myr} $）明亮（$ v = 9.2 $）k-dwarf托管三个透射行星的系统。使用光谱观测与Wiyn 3.5 M望远镜上的neID光谱仪，我们对TOI-2076 B的rossiter-mclaughlin效应进行建模，并得出$λ= -3 _ { - 15}^{+16 \：\：\：\：\ circ} $的天空投影倾斜的斜率。使用恒星的大小（$ r = 0.775 \ pm0.015 {r_ \ odot} $），以及恒星旋转期（$ p _ {\ mathrm {rotm {rot}} = 7.27 \ pm0.23 $ days） 34^\ Circ $在95 \％的信心），表明TOI-2076 b在良好的轨道上。从Apache Point天文台的3.5 M望远镜中同时进行扩散辅助光度法排除了过境期间的耀斑。 TOI-2076 B加入了具有良好一致的轨道的紧凑多个星际系统中的少量但不断增长的年轻行星样本，并且是具有$ \ lyssim年龄300 $ 300 $ MYR的第四个行星，在具有倾斜度测量的多运输系统中。 TOI-2076 b的低倾斜度以及系统中的过时时间变化的存在表明，TOI-2076系统可能是通过汇聚磁盘迁移在最初良好的磁盘中形成的。
TOI-2076 b is a sub-Neptune-sized planet ($R= 2.39 \pm 0.10 {R_\oplus}$) that transits a young ($204 \pm 50 {MYr}$) bright ($V = 9.2$) K-dwarf hosting a system of three transiting planets. Using spectroscopic observations with the NEID spectrograph on the WIYN 3.5 m Telescope, we model the Rossiter-McLaughlin effect of TOI-2076 b, and derive a sky-projected obliquity of $λ=-3_{-15}^{+16\:\circ}$. Using the size of the star ($R=0.775 \pm0.015 {R_\odot}$), and the stellar rotation period ($P_{\mathrm{rot}}=7.27\pm0.23$ days), we estimate an obliquity of $ψ=18_{-9}^{+10\:\circ}$ ($ψ< 34^\circ$ at 95\% confidence), demonstrating that TOI-2076 b is on a well-aligned orbit. Simultaneous diffuser-assisted photometry from the 3.5 m Telescope at Apache Point Observatory rules out flares during the transit. TOI-2076 b joins a small but growing sample of young planets in compact multi-planet systems with well-aligned orbits, and is the fourth planet with an age $\lesssim 300$ Myr in a multi-transiting system with an obliquity measurement. The low obliquity of TOI-2076 b and the presence of transit timing variations in the system suggest the TOI-2076 system likely formed via convergent disk migration in an initially well-aligned disk.
