We report the independent discovery of a new extrasolar transiting planet around OGLE-TR-113 , a candidate star from the Optical Gravitational Lensing Experiment .
Small radial-velocity variations have been detected based on observations conducted with the MIKE spectrograph on the Magellan I ( Baade ) telescope at the Las Campanas Observatory ( Chile ) during 2003 .
We have also carried out a light-curve analysis incorporating new photometry and realistic physical parameters for the star .
OGLE-TR-113b has an orbital period of only 1.43 days , a mass of 1.08 \pm 0.28 M _ { Jup } , and a radius of 1.09 \pm 0.10 R _ { Jup } .
Similar parameters have been obtained very recently in an independent study by Bouchy et al. , from observations taken a year later .
The orbital period of OGLE-TR-113b , and also that of the previously announced planet OGLE-TR-56b ( P _ { orb } = 1.21 days ) —the first two found photometrically— are much shorter than the apparent cutoff of close-in giant planets at 3-4-day periods found from high-precision radial velocities surveys .
Along with a third case reported by Bouchy et al .
( OGLE-TR-132b , P _ { orb } = 1.69 days ) , these objects appear to form a new class of “ very hot Jupiters ” that pose very interesting questions for theoretical study .