The Low Density Transiting Exoplanet WASP-15b
- West, R. G.
- Anderson, D. R.
- Gillon, Michaël
- Hebb, L.
- Hellier, C.
- Maxted, P. F. L.
- Queloz, D.
- Smalley, B.
- Triaud, A H M J
- Wilson, D. M.
- Bentley, S. J.
- Collier Cameron, A.
- Enoch, B.
- Horne, K.
- Irwin, J.
- Lister, T. A.
- Mayor, M.
- Parley, N.
- Pepe, F.
- Pollacco, D.
- Segransan, D.
- Spano, M.
- Udry, S.
- Wheatley, P. J.
DOIAbstract
We report the discovery of a low-density exoplanet transiting an 11th magnitude star in the Southern hemisphere. WASP-15b, which orbits its host star with a period P = 3.7520656 ± 0.0000028 d, has a mass M [SUB]p[/SUB] = 0.542 ± 0.050 M [SUB]J[/SUB] and radius R [SUB]p[/SUB] = 1.428 ± 0.077 R [SUB]J[/SUB], and is therefore one of the least dense transiting exoplanets so far discovered (rho[SUB]p[/SUB] = 0.247 ± 0.035 g cm[SUP]--3[/SUP]). An analysis of the spectrum of the host star shows it to be of spectral type around F5, with an effective temperature T [SUB]eff[/SUB] = 6300 ± 100 K and [Fe/H] = --0.17 ± 0.11
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