WASP-19b: The Shortest Period Transiting Exoplanet Yet Discovered

L. Hebb, A. Collier-Cameron, A.~H.~M.~J. Triaud, T.~A. Lister, B. Smalley, P.~F.~L. Maxted, C. Hellier, D.~R. Anderson, D. Pollacco, M. Gillon, D. Queloz, R.~G. West, S. Bentley, B. Enoch, C.~A. Haswell, K. Horne, M. Mayor, F. Pepe, D. Segransan, I. SkillenS. Udry, P.~J. Wheatley

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127 Citations (Scopus)


We report on the discovery of a new extremely short period transiting extrasolar planet, WASP-19b. The planet has mass M $_pl$ = 1.15 plusmn 0.08 M$_J$ , radius R $_pl$ = 1.31 plusmn 0.06 R$_J$ , and orbital period P = 0.7888399 plusmn 0.0000008 days. Through spectroscopic analysis, we determine the host star to be a slightly super-solar metallicity ([M/H] = 0.1 plusmn 0.1 dex) G-dwarf with T $_eff$ = 5500 plusmn 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 plusmn 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.
Original languageEnglish
Pages (from-to)224-231
Number of pages8
JournalThe Astrophysical Journal
Publication statusPublished - 1 Jan 2010


  • planetary systems, techniques: photometric, techniques: radial velocities


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