The Misaligned Polar Atmosphere of Sub-Neptune Exoplanet HD 3167 c
In the constellation Pisces , approximately 149 light-years from Earth, resides a planetary system that has fundamentally challenged models of orbital dynamics and planetary evolution . At the center of this system orbits HD 3167 c , a confirmed sub-Neptune exoplanet that represents one of the most dynamic architectural anomalies discovered in modern observational astronomy. Discovered via the transit method during NASA's K2 mission , HD 3167 c orbits a bright K0V main-sequence star . While sub-Neptunes—defined as planets with radii intermediate between Earth and Neptune—are the most abundant class of planets in the Milky Way, HD 3167 c stands out due to its extreme orbital inclination and dense volatile envelope . With a mass of approximately 9.80 Earth masses and a radius roughly 3.01 times that of Earth, HD 3167 c exhibits a bulk density of roughly 1.97 grams per cubic centimeter. This intermediate density places the planet squarely in the transitional realm between rocky su...