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

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

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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.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Early online date03 Nov 2017
Publication statusEarly online date - 03 Nov 2017


  • Astrophysics - Earth and Planetary Astrophysics


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