WASP-41b: A Transiting Hot Jupiter Planet Orbiting a Magnetically Active G8V Star

P.F.L. Maxted, D.R. Anderson, A. Collier Cameron, C. Hellier, D. Queloz, B. Smalley, [No Value] Stre, Don Pollacco, D. Ségransan, A.M.S. Smith, S. Udry

Research output: Contribution to journalArticle

79 Citations (Scopus)


We report the discovery of a transiting planet with an orbital period of 3.05 days orbiting the star TYC 7247-587-1. The star, WASP-41, is a moderately bright G8 V star (V=11.6) with a metallicity close to solar ([Fe/H]=-0.08±0.09). The star shows evidence of moderate chromospheric activity, both from emission in the cores of the Ca ii H and K ines and photometric variability with a period of 18.4 days and an amplitude of about 1%. We use a new method to show quantitatively that this periodic signal has a low false-alarm probability. The rotation period of the star implies a gyrochronological age for WASP-41 of 1.8 Gyr with an error of about 15%. We have used a combined analysis of the available photometric and spectroscopic data to derive the mass and radius of the planet (0.92±0.06 M, 1.20±0.06 R). Further observations of WASP-41 can be used to explore the connections between the properties of hot Jupiter planets and the level of chromospheric activity in their host stars.
Original languageEnglish
Pages (from-to)547-554
Number of pages8
JournalPublications of the Astronomical Society of the Pacific
Issue number903
Publication statusPublished - May 2011

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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