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Exoplanetary Scratchpad

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HD 97658 is also known as BD+26 2184, it is a nearby (68 ly) Yellow-orange star in Leo with a transiting super Earth in a torch orbit (though further out P = 9.5 d than most transiting planets). When discovered, it was the second brightest star in the sky known to have a transiting planet. It was discovered with dopplar spectrometry. Transits were later reported (leading them to think it had radius 2.9 RE and density of 1.4, giving it a possible Neptune-like extended atmosphere of H, He, and H2O), but later retracted. After expanding the search times, transits were detected at different times. The radius is 2.3 times that of Earth, coupled with a 7.9 Earth masses give a density of 3.4, and surface gravity of 1.6 Earths, suggesting a rocky core surrounded by either liquid volatiles or an extended gas envelope. A preliminary atmosphere probe found it to be featureless, possibly with clouds obscuring it atmospheric composition like in GJ 1214b, but also possibly because the atmosphere lacks hydrogen and is therefor very compact and hard to detect.

HD 97658 System Web Pages[]

HD 97658 System In the News[]

Super-Earth Planet Discovered With Radial Velocity (Nov 2010)[]

Sub-Neptune Transit Detected (Sep 2011)[]

Transit Not Confirmed (2012)[]

New Transits Detected at Unexpected Times (May 2013)[]

Atmosphere Probed (Oct 2014)[]

See also Gliese 1214 System

See Also[]