Kepler-36 (Redirected from Kepler-36c)

Kepler-36
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 25m 00.0431s
Declination +49° 13′ 54.631″
Apparent magnitude (V) 11.9
Characteristics
Spectral type G1IV
Astrometry
Proper motion (μ) RA: 0.970±0.041 mas/yr
Dec.: −8.073±0.043 mas/yr
Parallax (π)1.8654 ± 0.0215 mas
Distance1,750 ± 20 ly
(536 ± 6 pc)
Details
Mass1.071±0.043 M
Radius1.626±0.019 R
Surface gravity (log g)4.1±0.1 cgs
Temperature5911±66 K
Metallicity [Fe/H]−0.2±0.06 dex
Rotation17.20±0.2
Rotational velocity (v sin i)4.9±1.0 km/s
Other designations
Gaia DR2 2129931456691176576, KOI-277, KIC 11401755, 2MASS J19250004+4913545
Database references
SIMBADdata
KICdata

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. The planets, a super-Earth and a "mini-Neptune", are unusual in that they have very close orbits; their semi-major axes differ by only 0.013 AU. The outer planet orbits only 11% further than the inner one. Coupled with masses significantly higher than Earth, their gravitational influence to each other is significant, meaning that their interaction causes extreme transit timing variations for both. Kepler-36b and c have estimated densities of 6.8 and 0.86 g/cm3, respectively. The two planets are close to a 7:6 orbital resonance. The large difference in densities, despite the close proximity of the planets' orbits, is likely due to the large difference in mass. The innermost and less massive planet likely lost most, or all, of the hydrogen/helium envelope acquired during formation.

The Kepler-36 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 3.83+0.11
−0.10
 M🜨
0.1153 13.86821±0.00049 <0.04 90.0° 1.498+0.061
−0.049
 R🜨
c 7.13±0.18 M🜨 0.1283 16.21865±0.00010 <0.04 90.0° 3.679+0.096
−0.091
 R🜨

This page was last updated at 2024-03-12 09:40 UTC. Update now. View original page.

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