Exo Planet

An extrasolar planet, or exoplanet, is a planet outside the Solar system.
Discovery of Extrasolar planets :
[source : Wikipedia]

Title Planet Star Year Notes
First extrasolar planet discovered. PSR B1257+12 B
PSR B1257+12 C
PSR B1257+12
1992 First pulsar planets, first super-earths.
• The planet around Gamma Cephei was already suspected in 1988.
• HD 114762 b was discovered in 1989, but was not confirmed as a planet before 1996.
First discovery by a method
First planet discovered via pulsar timing.
PSR B1257+12 B
PSR B1257+12 C
PSR B1257+12
1992 First extrasolar planets discovered, first super-earths.
First planet discovered via radial velocity.
51 Pegasi b
51 Pegasi
1995
First planet discovered via transit.
OGLE-TR-56 b
OGLE-TR-56
2002 • The first extrasolar planet discovered to be transiting was HD 209458 b, which had already been discovered by the radial velocity method.
First planet discovered via gravitational lensing.
OGLE-2003-BLG- 235L b
OGLE-2003-BLG- 235L/MOA- 2003-BLG- 53L
2004
First directly imaged extrasolar planet. (infrared) 2M1207 b
2M1207
2004 May be a sub-brown dwarf instead of a planet, depending on formation mechanism and definitions chosen. If it is a planet, it is the first known planet around a brown dwarf.
First imaged extrasolar planet orbiting a 'normal' star. (infrared) 1RXS J160929.1-210524
2008 First extrasolar planet orbiting a Sun-like star[2]

First extrasolar planet directly imaged by visible light Fomalhaut b
Fomalhaut
2008 First planet orbiting an ABO star.
First discovery by system type
First extrasolar planet discovered in a solitary star system. PSR B1257+12 B
PSR B1257+12 C
PSR B1257+12
1992 First extrasolar planets discovered
• HD 114762 b was discovered in 1989, but was not confirmed as a planet before 1996.
First "free-floating" planet discovered. S Ori J053810.1-023626
(S Ori 70) 2004 Has a mass of 3 MJupiter, needs confirmation.
• Free-floating objects are not usually considered planets.
First planet discovered in a multiple star system. 55 Cancri b
55 Cancri
1996 55 Cnc has distant red dwarf companion.
• The planet around Gamma Cephei was already suspected in 1988.
• Gamma Cephei Ab is the first relatively close binary with a planet.
First planet discovered in a circumbinary orbit. PSR B1620-26 b
PSR B1620-26
1993 Orbits a pulsar and a white dwarf.
First multiple planet extrasolar system discovered. PSR B1257+12 A
PSR B1257+12 B
PSR B1257+12 C
PSR B1257+12
1992 A pulsar planetary system.

First planet discovered in globular cluster. PSR B1620-26 b
PSR B1620-26
1993 Located in Messier 4

First discovery by star type
First pulsar planet discovered. PSR B1257+12 B
PSR B1257+12 C
PSR B1257+12
1992
First known extrasolar planet orbiting a main sequence star. (Sun-like) 51 Pegasi b
51 Pegasi
1995 First hot jupiter.
First known planet orbiting an ABO star. (blue-white star) Fomalhaut b
Fomalhaut
2008 First extrasolar planet discovered by visible light image.
First known planet orbiting a red dwarf.
Gliese 876 b
Gliese 876
1998
First known planet orbiting a giant star.
Iota Draconis b
Iota Draconis
2002 • Aldebaran b was announced in 1997, but has not been confirmed.
First known planet orbiting a white dwarf.
PSR B1620-26 b
PSR B1620-26
1993 • GD 66 b was announced in 2007, but has not been confirmed
First known planet orbiting a brown dwarf.
2M1207 b
2M1207
2004 May in fact be a sub-brown dwarf instead of a planet, depending on formation mechanism and definitions chosen. First directly imaged planet.
First "free-floating" planet discovered. S Ori J053810.1-023626
(S Ori 70) 2004 Has mass of 3 MJupiter, needs confirmation.
• Free-floating objects are not usually considered planets.
Firsts by planet type
First hot jupiter.
51 Pegasi b
51 Pegasi
1995 First planet discovered orbiting a main sequence star.
First extrasolar terrestrial planet orbiting a main sequence star. Mu Arae c
Mu Arae
2004 Terrestrial nature of this planet is not confirmed, as no radius measurements are available so the density is unknown. The minimum mass is comparable to that of Uranus in our own solar system, which is not a terrestrial planet. The first extrasolar planet known to have a density compatible with being a rocky planet is CoRoT-7b.
First super-earth orbiting a main sequence star. Gliese 876 d
Gliese 876
2005 Orbits a red dwarf star.
First icy extrasolar planet orbiting a main sequence star. OGLE-2005-BLG- 390Lb
OGLE-2005-BLG- 390L
2006 Orbits a red dwarf star. The icy nature of this planet is not confirmed, as no radius measurements are available so the density is unknown. The first extrasolar planet known to have a density compatible with being an icy planet is GJ 1214 b, though even for this case there are other possibilities for the composition.
First ocean planet candidate. Gliese 581 d
Gliese 581
2007 Orbits a red dwarf star. This planet orbits a little too far from the star, but the greenhouse effect would be enough to make this planet habitable. The other ocean planet candidate GJ 1214 b was detected by transit in which the density was calculated and determined that this planet is an ocean planet.
Other firsts
First extrasolar transiting planet.
HD 209458 b
HD 209458
1999 • OGLE-TR-56 b is the first planet found by transit method.
First multi-planet extrasolar system directly imaged. HR 8799 b
HR 8799 c
HR 8799 d
HR 8799
2008
First planet discovered with a retrograde orbit.
WASP-17b
WASP-17
2009 The planet HAT-P-7b was discovered before WASP-17b, however its retrograde nature
was announced after that of WASP-17b