Kepler-36b
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Kepler-36b is an exoplanet orbiting the star
Kepler-36 Kepler-36 is a star in the constellation of Cygnus with two known planets. It has an anomalously large radius, meaning that it is a subgiant. Planetary system On June 21, 2012, the discovery of two planets orbiting the star was announced. ...
. This planet has the closest conjunction to Kepler-36c every 97 days. Its density is similar to that of
iron Iron () is a chemical element with Symbol (chemistry), symbol Fe (from la, Wikt:ferrum, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 element, group 8 of the periodic table. It is, Abundanc ...
. 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. 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.


References

Cygnus (constellation) 36b Exoplanets discovered in 2012 {{extrasolar-planet-stub