XO-5b: A Transiting Jupiter-sized Planet With A Four Day Period

Details XO-5b: A Transiting Jupiter-sized Planet With A Four Day Period XO-5b: A Transiting Jupiter-sized Planet With A Four Day Period

2008-05-15

arxiv.org/abs/0805.2399v1

Astronomy and Astrophysics

Astrophysics

10 pages, 9 Figures, Submitted to ApJ

Scientific paper

10.1086/591497

The star XO-5 (GSC 02959-00729, V=12.1, G8V) hosts a Jupiter-sized, Rp=1.15+/-0.12 Rjup, transiting extrasolar planet, XO-5b, with an orbital period of P=4.187732+/-0.00002 days. The planet mass (Mp=1.15+/-0.08 Mjup) and surface gravity (gp=22+/-5 m/s^2) are significantly larger than expected by empirical Mp-P and Mp-P-[Fe/H] relationships. However, the deviation from the Mp-P relationship for XO-5b is not large enough to suggest a distinct type of planet as is suggested for GJ 436b, HAT-P-2b, and XO-3b. By coincidence XO-5 overlies the extreme H I plume that emanates from the interacting galaxy pair NGC 2444/NGC 2445 (Arp 143).

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