Journal Article

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

Maxted, P. F. L., Street, R. A., Smith, A. M. S., Queloz, D., Triaud, A. H. M. J., Pollacco, D., Gillon, M., Smalley, B., Collier Cameron, A., Pepe, F., Hellier, C., West, R. G., Ségransan, D., Lister, T. A., Anderson, D. R., Udry, S.

2011

Overview

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 V star ( V = 11.6 V = 11.6 ) with a metallicity close to solar ([Fe/H] = -0.08 ± 0.09 [ Fe / H ] = - 0.08 ± 0.09 ). The star shows evidence of moderate chromospheric activity, both from emission in the cores of the Ca iiH 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 Jup 0.92 ± 0.06     M Jup ,1.20 ± 0.06 R Jup 1.20 ± 0.06     R Jup ). 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.

• Publisher: University of Chicago Press
• Subject: Astronomy / Astrophysics - Earth and Planetary Astrophysics / Aérospatiale, astronomie & astrophysique / Earth, ocean, space / Exact sciences and technology / Physical, chemical, mathematical & earth Sciences / Physique, chimie, mathématiques & sciences de la terre / Space science, astronomy & astrophysics