Hst Parallax Of XO-3 And Implications For The Structure Of Its Hot Jupiter

Details Hst Parallax Of XO-3 And Implications For The Structure Of Its Hot Jupiter Hst Parallax Of XO-3 And Implications For The Structure Of Its Hot Jupiter

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924517j&link_type=abstract

American Astronomical Society, AAS Meeting #219, #245.17

Astronomy and Astrophysics

Astronomy

Scientific paper

We use HST+FGS to measure the parallax of the transiting planet host star XO-3. Our parallax measurement, with a precision of 0.2 mas, and resulting distance to XO-3 constrains the radius of the star, thereby providing the most accurate radius determination to date for the massive extrasolar planet (XO-3b) in orbit around XO-3. The result allows us to critically test current giant extrasolar planet structure models. The implied radius for XO-3b is smaller than previous determinations, bringing the size of XO-3b more in line with models which include only insolation by the parent star. As a result, their may be no need to invoke heating that may be produced inside XO-3b by tides raised on the planet as it moves through its 3.2 d eccentric (e 0.22) orbit.

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