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Exoplanetary Scratchpad

[SysBP Img]

Star system 120 ly away in Cygnus with the second discovered transiting Super-Neptune and the least massive transiting planet known at the time. Also observed by Kepler and dubbed "Kepler 3b". Orbit unusually eccentric for a Hot Neptune (5 day period) and is inclined 103deg to its orange dwarf star's rotation. Natural radio waves may have been detected coming from the planet. Radial drifts may point to another planet. It was the first smaller planet found to have clear skies (the four previous planets studied were cloudy), which allowed its atmospheric composition to be studied, which was composed primarily of hydrogen and helium with some water (which would be over 1000F).

HAT-P-11 System Web Pages[]

HAT-P-11 System In the News[]

Second Transiting Neptune Discovered (Jan 09)[]

Follow Up Observations (May 2009)[]

High Inclination (2010)[]

Kepler and Ground Based Transits (2011)[]

Radio Emissions From Planet (2013)[]

First Time Water Detected on a Smaller Planet (2014)[]

See Also[]