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NGTS-10b: the shortest period hot Jupiter yet discovered

Smalley, Barry

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Abstract

We report the discovery of a new ultrashort period (USP) transiting hot Jupiter from the Next Generation Transit Survey (NGTS). NGTS-10b has a mass and radius of 2.162+0.092-0.107?MJ and 1.205+0.117-0.083?RJ and orbits its host star with a period of 0.7668944 ± 0.0000003?d, making it the shortest period hot Jupiter yet discovered. The host is a 10.4 ± 2.5?Gyr old K5V star (Teff = 4400 ± 100?K) of Solar metallicity ([Fe/H] = -0.02 ± 0.12?dex) showing moderate signs of stellar activity. NGTS-10b joins a short list of USP Jupiters that are prime candidates for the study of star–planet tidal interactions. NGTS-10b orbits its host at just 1.46 ± 0.18 Roche radii, and we calculate a median remaining inspiral time of 38?Myr and a potentially measurable orbital period decay of 7 s over the coming decade, assuming a stellar tidal quality factor Q's =2 × 107.

Citation

Smalley, B., McCormac, J., Gillen, E., Jackman, J. A. G., Brown, D. J. A., Bayliss, D., …West, R. G. (2020). NGTS-10b: the shortest period hot Jupiter yet discovered. Monthly Notices of the Royal Astronomical Society, 493(1), 126-140. https://doi.org/10.1093/mnras/staa115

Journal Article Type Article
Acceptance Date Jan 10, 2020
Publication Date Mar 1, 2020
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Volume 493
Issue 1
Pages 126-140
DOI https://doi.org/10.1093/mnras/staa115
Keywords techniques: photometric; stars: individual: NGTS-10; planetary systems
Publisher URL http://dx.doi.org/10.1093/mnras/staa115

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