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

Research output: Contribution to journalArticlepeer-review

150 Citations (Scopus)

Abstract

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 M-J, radius R-pl = 1.31 +/- 0.06 R-J, 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 (similar to 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
JournalAstrophysical Journal Letters
Volume708
Issue number1
DOIs
Publication statusPublished - 1 Jan 2010

Keywords

  • planetary systems
  • techniques: photometric
  • techniques: radial velocities
  • STELLAR ATMOSPHERE MODELS
  • LIMB-DARKENING LAW
  • SOLAR-TYPE STAR
  • EXTRASOLAR PLANET
  • SURFACE GRAVITIES
  • GIANT PLANETS
  • LIGHT CURVES
  • HOT JUPITER
  • EVOLUTION
  • MASS

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