论文标题
TOI-836:超级收获和迷你新闻,在附近的k-dwarf
TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
论文作者
论文摘要
我们使用苔丝第11和第38区和38区的数据介绍了两个过渡至836(TIC 440887364)的系外行星。 k-dwarf的质量为$ 0.68 \ pm0.05 $ m $ _ {\ odot} $,半径为$ 0.67 \ pm0.01 $ r $ $ _ {\ odot} $。我们获得了具有各种设施的光度跟踪观察结果,我们使用这些数据集来确定内部行星TOI-836 B是$ 1.70 \ pm0.07 $ r $ r $ _ {\ oplus} $ superth,在3.82天的orbit中,将其直接放入所谓的“ radius valley”。外行星TOI-836 C是$ 2.59 \ pm0.09 $ r $ _ {\ oplus} $ Mini-Neptune在8.60天轨道中。径向速度测量结果表明,TOI-836 B的质量为$ 4.5 \ pm0.9 $ m $ _ {\ oplus} $,而TOI-836 C的质量为$ 9.6 \ pm2.6 $ m $ _ $ _ {\ oplus} $。光度计观察表明,TOI-836 C的传输时机变化(TTV)在20分钟内,尽管没有可检测到的TOI-836 b。行星TO-836 C的TTV可能是由未发现的外部行星引起的。
We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with a mass of $0.68\pm0.05$ M$_{\odot}$ and a radius of $0.67\pm0.01$ R$_{\odot}$. We obtain photometric follow-up observations with a variety of facilities, and we use these data-sets to determine that the inner planet, TOI-836 b, is a $1.70\pm0.07$ R$_{\oplus}$ super-Earth in a 3.82 day orbit, placing it directly within the so-called 'radius valley'. The outer planet, TOI-836 c, is a $2.59\pm0.09$ R$_{\oplus}$ mini-Neptune in an 8.60 day orbit. Radial velocity measurements reveal that TOI-836 b has a mass of $4.5\pm0.9$ M$_{\oplus}$ , while TOI-836 c has a mass of $9.6\pm2.6$ M$_{\oplus}$. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 minutes for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.