NGTS-1b: A hot Jupiter transiting an M-dwarf

30 Oct 2017  ·  Bayliss Daniel, Gillen Edward, Eigmuller Philipp, McCormac James, Alexander Richard D., Armstrong David J., Booth Rachel S., Bouchy Francois, Burleigh Matthew R., Cabrera Juan, Casewell Sarah L., Chaushev Alexander, Chazelas Bruno, Csizmadia Szilard, Erikson Anders, Faedi Francesca, Foxell Emma, Gansicke Boris T., Goad Michael R., Grange Andrew, Gunther Maximilian N., Hodgkin Simon T., Jackman James, Jenkins James S., Lambert Gregory, Louden Tom, Metrailler Lionel, Moyano Maximiliano, Pollacco Don, Poppenhaeger Katja, Queloz Didier, Raddi Roberto, Rauer Heike, Raynard Liam, Smith Alexis M. S., Soto Maritza, Thompson Andrew P. G., Titz-Weider Ruth, Udry Stephane, Walker Simon. R., Watson Christopher A., West Richard G., Wheatley Peter J. ·

We present the discovery of NGTS-1b, a hot-Jupiter transiting an early M-dwarf host ($T_{eff}=3916^{+71}_{-63}~K$) in a P=2.674d orbit discovered as part of the Next Generation Transit Survey (NGTS). The planet has a mass of $0.812^{+0.066}_{-0.075}~M_{J}$, making it the most massive planet ever discovered transiting an M-dwarf... The radius of the planet is $1.33^{+0.61}_{-0.33}~R_{J}$. 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 disk population. With a deep (2.5%) transit around a $K=11.9$ host, NGTS-1b will be a strong candidate to probe giant planet composition around M-dwarfs via JWST transmission spectroscopy. read more

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Earth and Planetary Astrophysics