Kepler-36b

Kepler-36b is an exoplanet orbiting the star Kepler-36.^[1] This planet has the closest conjunction to Kepler-36c every 97 days. Its density is similar to that of iron.^[2]

Kepler-36b

Discovery
Discovery date	2012
Detection method	Transit (Kepler Mission)
Orbital characteristics
Semi-major axis	0.1153 AU (17,250,000 km)
Eccentricity	<0.04
Orbital period (sidereal)	13.83989 d
Inclination	~90
Star	Kepler-36 (KOI-277)
Physical characteristics
Mean radius	1.486 R🜨
Mass	4.45 M🜨
Mean density	6.8 g/cm3 (0.25 lb/cu in)
Temperature	978±11 K

During their closest approach, Kepler-36b and Kepler-36c are located only 0.013 AU (about 1,900,000 km) from each other, which causes extreme transit-timing variations for both planets. Transit-timing variations caused by Kepler-36c are strong enough to put narrow constraints on Kepler-36b's mass.^[2] The close proximity of the planet to its host star combined with its relatively low mass caused the planet to lose all or most of its primordial hydrogen/helium envelope.^[3]