From the total of stars known to have

exoplanet An exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first det ...

s (as of ), there are a total of known multiplanetary systems, or stars with at least two confirmed planets, beyond the

Solar System The Solar SystemCapitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Sola ...

. This list includes systems with at least three confirmed planets or two confirmed planets where additional candidates have been proposed. The stars with the most confirmed planets are the

Sun The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light a ...

(the Solar System's star) and

Kepler-90 Kepler-90, also designated 2MASS J18574403+4918185, is a F-type star located about from Earth in the constellation of Draco (constellation), Draco. It is notable for possessing a planetary system with the same number of observed planets ...

, with 8 confirmed planets each, followed by

TRAPPIST-1 , - ! style="background-color: #FFFFC0; text-align: center;" colspan="2", Characteristics , - style="vertical-align:top" ! style="text-align:left" , Evolutionary stage , Main sequence , - style="vertical-align:top" ! style="text-ali ...

with 7 planets. The multiplanetary systems are listed below according to the star's distance from Earth. Proxima Centauri, the closest star to the Solar System, has at least one planet (the confirmed b, along with the candidate d and the disputed c). The nearest system with four or more confirmed planets is

Barnard Star Barnard's Star is a small red dwarf star in the constellation of Ophiuchus. At a distance of from Earth, it is the fourth-nearest-known individual star to the Sun after the three components of the Alpha Centauri system, and is the cl ...

, with four known. The farthest confirmed system with two or more planets is OGLE-2012-BLG-0026L, at away. The table below contains information about the coordinates, spectral and physical properties, and the number of confirmed (unconfirmed) planets for systems with at least 2 planets and 1 not confirmed. The two most important stellar properties are

mass Mass is an Intrinsic and extrinsic properties, intrinsic property of a physical body, body. It was traditionally believed to be related to the physical quantity, quantity of matter in a body, until the discovery of the atom and particle physi ...

and

metallicity In astronomy, metallicity is the Abundance of the chemical elements, abundance of Chemical element, elements present in an object that are heavier than hydrogen and helium. Most of the normal currently detectable (i.e. non-Dark matter, dark) matt ...

because they determine how these

planetary system A planetary system is a set of gravity, gravitationally bound non-stellar Astronomical object, bodies in or out of orbit around a star or star system. Generally speaking, systems with one or more planets constitute a planetary system, although ...

s form. Systems with higher mass and metallicity tend to have more planets and more massive planets. However, although low metallicity stars tend to have fewer massive planets, particularly hot-Jupiters, they also tend to have a larger number of close-in planets, orbiting at less than 1 AU.

Multiplanetary systems

Stars orbited by both planets and brown dwarfs

These are stars orbited by objects on both sides of the ~13

Jupiter mass The Jupiter mass, also called Jovian mass, is the unit of mass equal to the total mass of the planet Jupiter. This value may refer to the mass of the planet alone, or the mass of the entire Jovian system to include the moons of Jupiter. Jupiter ...

dividing line. * 54 Piscium (HD 3651) * HD 168443 *

HD 4113 HD 4113 is a double star system in the southern constellation of Sculptor. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.88. The distance to this star, as estimated by parallax measurements, ...

A *

Epsilon Indi Epsilon Indi, Latinized from ε Indi, is a star system located at a distance of approximately 12 light-years from Earth in the southern constellation of Indus. The star has an orange hue and is faintly visible to the naked eye with an ...

A * HD 82943 * Pi Mensae (TOI-144) * HD 38529 *

HD 245134 TOI-4603 b is a gas giant exoplanet orbiting HD 245134, a F-type star, F-type subgiant star located 731 light-years away, in the constellation of Taurus (constellation), Taurus. It orbits its host star at a distance of , completing one orbit every ...

KMT-2020-BLG-0414L KMT-2020-BLG-0414L is a white dwarf star about 4,000 light-years away in the constellation Sagittarius (constellation), Sagittarius, which is orbited by an Earth-mass exoplanet and a brown dwarf. Discovery This system was discovered via th ...

Notes

References

{{DEFAULTSORT:Multiplanetary systems *List Multiplanetary systems

Multiplanetary systems

Stars orbited by both planets and brown dwarfs

See also

Notes

References