Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9605j&link_type=abstract
American Astronomical Society Meeting 210, #96.05; Bulletin of the American Astronomical Society, Vol. 39, p.225; Bulletin of th
Mathematics
Logic
1
Scientific paper
We report the discovery of a massive planet (≈12 MJUP) in an eccentric orbit (e ≈ 0.2) around the F6 star XO-3. This planet transits the 10th magnitude star every 3.19 days. This system is unusual for a number of reasons. XO-3b is one of the most massive planets discovered around any star for which the orbital period is less than 10 days. The mass is near the deuterium burning limit of 13 MJUP which is a proposed boundary between planets and brown dwarfs. Burrows et al. (2001) propose that formation in a disk or formation in the interstellar medium in a manner similar to stars is a more logical way to differentiate planets and brown dwarfs. Our current observations are not adequate to address this distinction. XO-3b is also unusual in that its eccentricity is large given its relatively short orbital period. Finally, the star XO-3 is somewhat metal poor, with [Fe/H] ≈ -0.25. We will present our observations leading to this discovery and discuss the implications of this system for models of planet formation.
Bissinger R.
Burke Christopher J.
Fleenor Matthew
Foote Cindy N.
Garcia-Melendo Enrique
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