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Title: WASP-54b, WASP-56b, and WASP-57b: Three new sub-Jupiter mass planets from SuperWASP
Authors: Faedi, F.
Pollacco, D.
Barros, S. C. C.
Brown, D.
Cameron, A. C.
Doyle, A. P.
Enoch, R.
Gillon, M.
Chew, Y. G. M.
Hebrard, G.
Lendl, M.
Liebig, C.
Smalley, B.
Triaud, A. H. M. J.
West, Richard Granville
Wheatley, P. J.
Alsubai, K. A.
Anderson, D. R.
Armstrong, D.
Bento, J.
Bochinski, J.
Bouchy, F.
Busuttil, R.
Fossati, L.
Fumel, A.
Haswell, C. A.
Hellier, C.
Holmes, S.
Jehin, E.
Kolb, U.
McCormac, J.
Miller, G. R. M.
Moutou, C.
Norton, A. J.
Parley, N.
Queloz, D.
Santerne, A.
Skillen, I.
Smith, A. M. S.
Udry, S.
Watson, C.
First Published: 25-Feb-2013
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2013, 551, A73
Abstract: We present three newly discovered sub-Jupiter mass planets from the SuperWASP survey: WASP-54b is a heavily bloated planet of mass 0.636[Superscript: +0.025][Subscript: -0.024]MJ and radius 1.653[Superscript: +0.090][Subscript: -0.083]RJ. It orbits a F9 star, evolving off the main sequence, every 3.69 days. Our MCMC fit of the system yields a slightly eccentric orbit (e = 0.067[Superscript: +0.033][Subscript: -0.025]) for WASP-54b. We investigated further the veracity of our detection of the eccentric orbit for WASP-54b, and we find that it could be real. However, given the brightness of WASP-54 V = 10.42 mag, we encourage observations of a secondary eclipse to draw robust conclusions on both the orbital eccentricity and the thermal structure of the planet. WASP-56b and WASP-57b have masses of 0.571[Superscript: +0.034][Subscript: -0.035]MJ and 0.672[Superscript: +0.049][Subscript: -0.046]MJ, respectively; and radii of 1.092[Superscript: +0.035][Subscript: -0.033]RJ for WASP-56b and 0.916[Superscript: +0.017][Subscript: -0.014]RJ for WASP-57b. They orbit main sequence stars of spectral type G6 every 4.67 and 2.84 days, respectively. WASP-56b and WASP-57b show no radius anomaly and a high density possibly implying a large core of heavy elements; possibly as high as ~50 M⊕ in the case of WASP-57b. However,the composition of the deep interior of exoplanets remains still undetermined. Thus, more exoplanet discoveries such as the ones presented in this paper, are needed to understand and constrain giant planets’ physical properties.
DOI Link: 10.1051/0004-6361/201220520
ISSN: 0004-6361
eISSN: 1432-0746
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © ESO, 2013. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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