WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets

Details WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets

2011-05-16

arxiv.org/abs/1105.3179v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

12 pages, 8 figures, 5 tables. Submitted to MNRAS

Scientific paper

We report the discovery of three extrasolar planets that transit their moderately bright (Vmag = 12-13) host stars. WASP-44b is a 0.89-MJup planet in a 2.42-day orbit around a G8V star. WASP-45b is a 1.03-MJup planet which passes in front of the limb of its K2V host star every 3.13 days. Weak Ca H+K emission seen in the spectra of WASP-45 suggests the star is chromospherically active. WASP-46b is a 2.10-MJup planet in a 1.43-day orbit around a G6V star. Rotational modulation of the light curves of WASP-46 and weak Ca H+K emission in its spectra show the star to be photospherically and chromospherically active. We imposed circular orbits in our analyses as the radial velocity data are consistent with (near-)circular orbits, as could be expected from both empirical and tidal-theory perspectives for such short-period, Jupiter-mass planets. We discuss the impact of fitting for eccentric orbits for these type of planets when not supported by the data. The derived planetary and stellar radii depend on the fitted eccentricity and further studies use these quantities in attempts to understand planet structure, the interdependence of parameters and the relevant physics for extrasolar planets. As such, we recommend exercising caution in fitting the orbits of short period, Jupiter-mass planets with an eccentric orbital model when there is no evidence of non-circularity.

Affiliated with

Also associated with

No associations

Rating

WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-78106