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WASP-22b: a transiting "hot Jupiter" planet in a hierarchical triple system

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Maxted, P. F. L., Anderson, D. R., Gillon, M., Hellier, C., Queloz, D., Smalley, B., Triaud, A. H. M. J., West, Richard G., Wilson, D. M., Bentley, S. J. et al.

. (2010) WASP-22b: a transiting "hot Jupiter" planet in a hierarchical triple system. Astronomical Journal, Vol.140 (No.6). pp. 2007-2012. ISSN 0004-6256

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Official URL: http://dx.doi.org/10.1088/0004-6256/140/6/2007

Abstract

We report the discovery of a transiting planet orbiting the star TYC 6446-326-1. The star, WASP-22, is a moderately bright (V = 12.0) solar-type star (T-eff = 6000 +/- 100 K, [Fe/H]= -0.05 +/- 0.08). The light curve of the star obtained with the WASP-South instrument shows periodic transit-like features with a depth of about 1% and a duration of 0.14 days. The presence of a transit-like feature in the light curve is confirmed using z-band photometry obtained with Faulkes Telescope South. High-resolution spectroscopy obtained with the CORALIE and HARPS spectrographs confirms the presence of a planetary mass companion with an orbital period of 3.533 days in a near-circular orbit. From a combined analysis of the spectroscopic and photometric data assuming that the star is a typical main-sequence star we estimate that the planet has a mass M-P = 0.56 +/- 0.02M(Jup) and a radius R-P = 1.12 +/- 0.04R(Jup). In addition, there is a linear trend of 40 m s(-1) yr(-1) in the radial velocities measured over 16 months, from which we infer the presence of a third body with a long-period orbit in this system. The companion may be a low mass M-dwarf, a white dwarf, or a second planet.

Item Type:

Journal Article

Subjects:

Q Science > QB Astronomy

Divisions:

Faculty of Science > Physics

Journal or Publication Title:

Astronomical Journal

Publisher:

Institute of Physics Publishing Ltd.

ISSN:

0004-6256