The host star is a main-sequence star with the
spectral classification F5V and apparent magnitude 9.98, well below the naked-eye visibility limit. It has a mass of 1.386±0.045
M☉, a radius of 1.468±0.054
R☉, and a surface temperature of 6477+13 −15 K.[7][8][5]
History
The planet HAT-P-14b was named Sissi. The name was selected by
Austria as part of the
NameExoWorlds campaign for the 100th anniversary of the
IAU. The planet was named after the character Sissi in the movie Sissi, who is married to Franz. The role is played by the actress
Romy Schneider. The star HAT-P-14 is named Franz.[9][10]
HAT-P-14b was selected as the target object for testing the
James Webb Space Telescope instruments intended for spectroscopic studies of transiting exoplanets. It was chosen because its high surface gravity should produce a very flat spectrum, regardless of the planet's composition.[11]
Orbit
HAT-P-14b is located very close orbit to its star, taking only 4.6
days to complete one orbit. Observations of the
Rossiter–McLaughlin effect with the
Keck telescope show that it orbits in a
retrograde fashion relative to the rotation axes of its parent star,[12] spin-orbit angle equal to -170.9±5.1°.[13]