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WASP-22 b: A Transiting "Hot Jupiter" Planet in a Hierarchical Triple System

Authors
  • Maxted, P. F. L.
  • Anderson, D. R.
  • Gillon, Michaël
  • Hellier, C.
  • Queloz, D.
  • Smalley, B.
  • Triaud, A H M J
  • West, R. G.
  • Wilson, D. M.
  • Bentley, S. J.
  • Cegla, H.
  • Collier Cameron, A.
  • Enoch, B.
  • Hebb, L.
  • Horne, K.
  • Irwin, J.
  • Lister, T. A.
  • Mayor, M.
  • Parley, N.
  • Pepe, F.
  • And 4 more
Publication Date
Dec 01, 2010
Source
ORBi
Keywords
Language
English
License
Unknown
External links

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[SUB]eff[/SUB] = 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 [SUB]p[/SUB] = 0.56 ± 0.02M [SUB]Jup[/SUB] and a radius R [SUB]p[/SUB] = 1.12 ± 0.04R [SUB]Jup[/SUB]. In addition, there is a linear trend of 40 m s[SUP]–1[/SUP] yr[SUP]–1[/SUP] 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.

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