The Open UniversitySkip to content

WASP-19b: The shortest period transiting exoplanet yet discovered

Hebb, L.; Collier-Cameron, A.; Triaud, A. H. M. J.; Lister, T. A.; Smalley, B.; Maxted, P. F. L.; Hellier, C.; Anderson, D. R.; Pollacco, D.; Gillon, M.; Queloz, D.; West, R. G.; Bentley, S.; Enoch, B.; Haswell, C. A.; Horne, K.; Mayor, M.; Pepe, F.; Segransan, D.; Skillen, I.; Udry, S. and Wheatley, P. J. (2010). WASP-19b: The shortest period transiting exoplanet yet discovered. The Astrophysical Journal, 708(1) pp. 224–231.

DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


We report on the discovery of a new extremely short period transiting extrasolar planet, WASP-19b. The planet has mass M pl = 1.15 ± 0.08 MJ, radius R pl = 1.31 ± 0.06 RJ, and orbital period P = 0.7888399 ± 0.0000008 days. Through spectroscopic analysis, we determine the host star to be a slightly super-solar metallicity ([M/H] = 0.1 ± 0.1 dex) G-dwarf with T eff = 5500 ± 100 K. In addition, we detect periodic, sinusoidal flux variations in the light curve which are used to derive a rotation period for the star of P rot = 10.5 ± 0.2 days. The relatively short stellar rotation period suggests that either WASP-19 is somewhat young (~ 600 Myr old) or tidal interactions between the two bodies have caused the planet to spiral inward over its lifetime resulting in the spin-up of the star. Due to the detection of the rotation period, this system has the potential to place strong constraints on the stellar tidal quality factor, Q's, if a more precise age is determined.

Item Type: Journal Item
Copyright Holders: 2009 IOP Publishing
ISSN: 1538-4357
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 26334
Depositing User: Colin Smith
Date Deposited: 14 Jan 2011 11:22
Last Modified: 20 Aug 2019 11:33
Share this page:


Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU