论文标题
NGTS-12B：7.53天轨道中的亚湿质量过渡系外行星
NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit
论文作者
论文摘要
我们报告了下一代过境调查（NGTS）对过渡系外行星NGTS-12B的发现。主机明星NGTS-12是V = 12.38 MAG Star，有效温度为T $ _ {\ rm eff} $ = $ 5690 \ pm130 $K。NGTS-12B轨道，周期为$ P = 7.53 $ d，使其成为由主要NGTS调查发现的最长时期的Planet。我们将NGTS Transit信号与从TESS完整框架图像中提取的数据一起验证，并将光度法与HARPS和FEROS的径向速度测量结合在一起，我们确定NGTS-12B的质量为0.208 \ pm0.022 $ m $ _ $ _ {J} $ {J} $ and radius and radius and radius of pm pm pm048 $ $ 1.048 $ 0.0.0.0.0322222222222 r radius。当我们考虑出色的特性时，NGTS-12B坐在Neptunian沙漠的边缘，强调了在研究沙漠时同时考虑地球和星星的重要性。 NGTS-12B的长时间结合其低密度仅为$ 0.223 \ pm0.029 $ g cm $^{ - 3} $，使其成为通过传输光谱率（带有传输光谱量）的大气表征的有吸引力的目标。
We report the discovery of the transiting exoplanet NGTS-12b by the Next Generation Transit Survey (NGTS). The host star, NGTS-12, is a V=12.38 mag star with an effective temperature of T$_{\rm eff}$=$5690\pm130$ K. NGTS-12b orbits with a period of $P=7.53$d, making it the longest period planet discovered to date by the main NGTS survey. We verify the NGTS transit signal with data extracted from the TESS full-frame images, and combining the photometry with radial velocity measurements from HARPS and FEROS we determine NGTS-12b to have a mass of $0.208\pm0.022$ M$_{J}$ and a radius of $1.048\pm0.032$ R$_{J}$. NGTS-12b sits on the edge of the Neptunian desert when we take the stellar properties into account, highlighting the importance of considering both the planet and star when studying the desert. The long period of NGTS-12b combined with its low density of just $0.223\pm0.029$ g cm$^{-3}$ make it an attractive target for atmospheric characterization through transmission spectroscopy with a Transmission Spectroscopy Metric of 89.4.
