NGTS-1b: a hot Jupiter transiting an M-dwarf
NGTS-1b: a hot Jupiter transiting an M-dwarf
复制标题
NGTS-1b：一颗热木星凌日 M 矮星
DOI：
10.1093/mnras/stx2778
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发表时间：
2018
影响因子：
4.8
通讯作者：
Bayliss D
中科院分区：
文献类型：
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作者：
Bayliss D
我们发现了NGTS-1b，这是一颗热木星，在AP=2.647 d轨道上凌日一颗早期的M矮星(Tef，*=K)，这是下一代凌日调查的一部分。这颗行星的质量为MJ， 使其成为迄今发现的最大质量的凌日M-矮星。这颗行星的半径是RJ。由于凌日是掠食的，我们通过对数据进行建模，并对已知气态巨行星的密度进行优先排序，来确定这个半径。NGTS-1b是在M矮星周围发现的第三颗凌日巨行星，强化了近距离气体巨星可以形成和迁移的概念，类似于已知的太阳类型恒星周围的热木星群体。主恒星没有显示出活动的迹象，运动学暗示这颗恒星来自厚厚的圆盘群。随着一次较深的凌日(2.5 / cent)绕着AK=911.9主机，NGTS-1b将成为通过詹姆斯·韦伯太空望远镜传输光谱学探测围绕M-矮星的巨行星组成的有力候选者。
We present the discovery of NGTS-1b, a hot Jupiter transiting an early M-dwarf host (Teff,*=K) in aP= 2.647 d orbit discovered as part of the Next Generation Transit Survey (NGTS). The planet has a mass ofMJ, making it the most massive planet ever discovered transiting an M-dwarf. The radius of the planet isRJ. Since the transit is grazing, we determine this radius by modelling the data and placing a prior on the density from the population of known gas giant planets. NGTS-1b is the third transiting giant planet found around an M-dwarf, reinforcing the notion that close-in gas giants can form and migrate similar to the known population of hot Jupiters around solar-type stars. The host star shows no signs of activity, and the kinematics hint at the star being from the thick disc population. With a deep (2.5 per cent) transit around aK= 11.9 host, NGTS-1b will be a strong candidate to probe giant planet composition around M-dwarfs viaJames Webb Space Telescopetransmission spectroscopy.