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The 0.5MJ transiting exoplanet WASP-13b

By I. Skillen, Don Pollacco, A. Collier Cameron, L. Hebb, E. Simpson, François Bouchy, Damian Joseph Christian, N. P. Gibson, G. Hébrard, Y. C. Joshi, B. Loeillet, Barry Smalley, Eric Stempels, R. A. Street, S. Udry, Richard G. West, D. R. Anderson, S. C. C. Barros, B. Enoch, C. A. Haswell, Coel Hellier, K. Horne, Jonathan Irwin, F. P. Keenan, T. A. Lister, Pierre Maxted, M. Mayor, Claire Moutou, Andrew J. Norton, N. Parley, Didier Queloz, R. Ryans, Ian Todd, P. J. Wheatley and D. M. Wilson


We report the discovery of WASP-13b, a low-mass $ M_{\rm p} = 0.46 ^_~M_J$ transiting exoplanet with an orbital period of 4.35298 $\pm$ 0.00004 days. The transit has a depth of 9 mmag, and although our follow-up photometry does not allow us to constrain the impact parameter well (0 < b < 0.46), with radius in the range $R_{\rm p}$ ~ 1.06-1.21 RJ the location of WASP-13b in the mass-radius plane is nevertheless consistent with H/He-dominated, irradiated, low core mass and core-free theoretical models. The G1V host star is similar to the Sun in mass $(M__ ~M_{\odot})$ and metallicity ([M/H] = 0.0$\pm$0.2), but is possibly older ( $8.5^_{\rm -4.9}$ Gyr)

Topics: QB
Publisher: EDP Sciences
Year: 2009
OAI identifier:

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