Gamma1 Leonis b
Encyclopedia
Gamma1 Leonis b is an extrasolar planet
located 125.5 light years away in the constellation Leo
, orbiting the giant star
Gamma1 Leonis
.
variations would also hint two strong signals at 8.5 and 1340 days. The former periodicity is likely due to stellar pulsation, whereas the latter could be indicative of the presence of an additional planetary companion with 2.14 Jupiter masses, moderate eccentricity (e=0.13) and located at 2.6 Astronomical Units away from the giant star. Nevertheless the nature of such a signal is still unclear and further investigations are needed to confirm or rule out an additional substellar companion.
masses. The true mass, as with the majority of other extrasolar planets discovered by the radial velocity method, is unknown.
Extrasolar planet
An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...
located 125.5 light years away in the constellation Leo
Leo (constellation)
Leo is one of the constellations of the zodiac. Its name is Latin for lion. Its symbol is . Leo lies between dim Cancer to the west and Virgo to the east.-Stars:...
, orbiting the giant star
Giant star
A giant star is a star with substantially larger radius and luminosity than a main sequence star of the same surface temperature. Typically, giant stars have radii between 10 and 100 solar radii and luminosities between 10 and 1,000 times that of the Sun. Stars still more luminous than giants are...
Gamma1 Leonis
Gamma Leonis
Gamma Leonis is a binary star system in the constellation Leo. It has the traditional name Algieba or Al Gieba.-Name origin and history:...
.
Discovery
On November 6, 2009, a planetary companion around primary star Gamma1 Leonis has been announced . Moreover radial velocityRadial velocity
Radial velocity is the velocity of an object in the direction of the line of sight . In astronomy, radial velocity most commonly refers to the spectroscopic radial velocity...
variations would also hint two strong signals at 8.5 and 1340 days. The former periodicity is likely due to stellar pulsation, whereas the latter could be indicative of the presence of an additional planetary companion with 2.14 Jupiter masses, moderate eccentricity (e=0.13) and located at 2.6 Astronomical Units away from the giant star. Nevertheless the nature of such a signal is still unclear and further investigations are needed to confirm or rule out an additional substellar companion.
Characteristics
The planet has a minimum mass of 8.78 JupiterJupiter
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...
masses. The true mass, as with the majority of other extrasolar planets discovered by the radial velocity method, is unknown.