The low density transiting exoplanet WASP-15b
R. G. West, D. R. Anderson, M. Gillon, L. Hebb, C. Hellier, P. F. L., Maxted, D. Queloz, B. Smalley, A. H. M. J. Triaud, D. M. Wilson, S. J., Bentley, A. Collier Cameron, B. Enoch, K. Horne, J. Irwin, T. A. Lister, M., Mayor, N. Parley, F. Pepe, D. Pollacco, D. Segransan
TL;DR
This paper reports the discovery and characterization of WASP-15b, a low-density transiting exoplanet with a short orbital period, orbiting an F5 star, highlighting its unusually low density among known transiting exoplanets.
Contribution
The paper presents the discovery and detailed physical characterization of WASP-15b, including its mass, radius, density, and host star properties, adding to the understanding of low-density exoplanets.
Findings
WASP-15b has a density of 0.247 g/cm^3, making it one of the least dense transiting exoplanets.
The host star is an F5 type with T_eff=6300K and metallicity [Fe/H]=-0.17.
The planet orbits its star every 3.75 days with a mass of 0.542 M_J and radius of 1.428 R_J.
Abstract
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+-0.0000028d has a mass M_p=0.542+-0.050M_J and radius R_p=1.428+-0.077R_J, and is therefore the one of least dense transiting exoplanets so far discovered (rho_p=0.247+-0.035g cm^-3). An analysis of the spectrum of the host star shows it to be of spectral type around F5, with an effective temperature T_eff=6300+-100K and [Fe/H]=-0.17+-0.11.
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