Wasp-22 b: A transiting "hot jupiter" planet in a hierarchical triple system

P. F L Maxted, D. R. Anderson, M. Gillon, C. Hellier, D. Queloz, B. Smalley, A. H M J Triaud, R. G. West, D. M. Wilson, S. J. Bentley, H. Cegla, A. Collier Cameron, B. Enoch, L. Hebb, K. Horne, J. Irwin, T. A. Lister, M. Mayor, N. Parley, F. PepeD. Pollacco, D. Segransan, S. Udry, P. J. Wheatley

Research output: Contribution to journalArticle

23 Citations (Scopus)

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 (Teff = 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 mainsequence star we estimate that the planet has a mass Mp = 0.56 ± 0.02MJup and a radius Rp = 1.12 ± 0.04RJup. 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.

Original languageEnglish
Pages (from-to)2007-2012
Number of pages6
JournalAstronomical Journal
Volume140
Issue number6
DOIs
Publication statusPublished - 1 Dec 2010
Externally publishedYes

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wasp
Jupiter (planet)
Jupiter
planet
stars
planets
transit
light curve
spectroscopy
planetary mass
circular orbits
radial velocity
spectrographs
photometry
telescopes
orbits
trends
orbitals
radii
high resolution

Keywords

  • Planetary systems

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Maxted, P. F. L., Anderson, D. R., Gillon, M., Hellier, C., Queloz, D., Smalley, B., ... Wheatley, P. J. (2010). Wasp-22 b: A transiting "hot jupiter" planet in a hierarchical triple system. Astronomical Journal, 140(6), 2007-2012. https://doi.org/10.1088/0004-6256/140/6/2007

Wasp-22 b : A transiting "hot jupiter" planet in a hierarchical triple system. / Maxted, P. F L; Anderson, D. R.; Gillon, M.; Hellier, C.; Queloz, D.; Smalley, B.; Triaud, A. H M J; West, R. G.; Wilson, D. M.; Bentley, S. J.; Cegla, H.; Cameron, A. Collier; Enoch, B.; Hebb, L.; Horne, K.; Irwin, J.; Lister, T. A.; Mayor, M.; Parley, N.; Pepe, F.; Pollacco, D.; Segransan, D.; Udry, S.; Wheatley, P. J.

In: Astronomical Journal, Vol. 140, No. 6, 01.12.2010, p. 2007-2012.

Research output: Contribution to journalArticle

Maxted, PFL, Anderson, DR, Gillon, M, Hellier, C, Queloz, D, Smalley, B, Triaud, AHMJ, West, RG, Wilson, DM, Bentley, SJ, Cegla, H, Cameron, AC, Enoch, B, Hebb, L, Horne, K, Irwin, J, Lister, TA, Mayor, M, Parley, N, Pepe, F, Pollacco, D, Segransan, D, Udry, S & Wheatley, PJ 2010, 'Wasp-22 b: A transiting "hot jupiter" planet in a hierarchical triple system', Astronomical Journal, vol. 140, no. 6, pp. 2007-2012. https://doi.org/10.1088/0004-6256/140/6/2007
Maxted PFL, Anderson DR, Gillon M, Hellier C, Queloz D, Smalley B et al. Wasp-22 b: A transiting "hot jupiter" planet in a hierarchical triple system. Astronomical Journal. 2010 Dec 1;140(6):2007-2012. https://doi.org/10.1088/0004-6256/140/6/2007
Maxted, P. F L ; Anderson, D. R. ; Gillon, M. ; Hellier, C. ; Queloz, D. ; Smalley, B. ; Triaud, A. H M J ; West, R. G. ; Wilson, D. M. ; Bentley, S. J. ; Cegla, H. ; Cameron, A. Collier ; Enoch, B. ; Hebb, L. ; Horne, K. ; Irwin, J. ; Lister, T. A. ; Mayor, M. ; Parley, N. ; Pepe, F. ; Pollacco, D. ; Segransan, D. ; Udry, S. ; Wheatley, P. J. / Wasp-22 b : A transiting "hot jupiter" planet in a hierarchical triple system. In: Astronomical Journal. 2010 ; Vol. 140, No. 6. pp. 2007-2012.
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AU - Hellier, C.

AU - Queloz, D.

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AU - Triaud, A. H M J

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AU - Wilson, D. M.

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AU - Cegla, H.

AU - Cameron, A. Collier

AU - Enoch, B.

AU - Hebb, L.

AU - Horne, K.

AU - Irwin, J.

AU - Lister, T. A.

AU - Mayor, M.

AU - Parley, N.

AU - Pepe, F.

AU - Pollacco, D.

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