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

Smalley, Barry

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