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Exoplanetary Scratchpad

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Ross 780 is also known as Gl 876 and the flare star IL Aquarii. Very nearby quadruple planet system and the first Red Dwarf found to have planets. The innermost planet (d, Hot Superterran, rocky-water) was the first found rocky planet around a normal star (the first true Super-Earth, at epistellar distances). The outer three planets c (Warm Saturnian), b (Warm Jovian), and e (Cold Neptunian) are in 1:2:4 (30d/60d/120d) resonance (the exoplanet resonance and first triple-resonant planets discovered). The outermost planet has a Mercury-like orbit. Planet b is second discovered by ELODIE after 51 Peg b and the second to have its mass exactly measured and the first to have done so by astrometry.

Gliese 876 System Web Pages[]

Gliese 876 System In the News[]

Discovery of Planet b (1998)[]

Discovery of the nearest exoplanet to the Sun article

Discovery of Resonant Planet c (2001)[]

A planet in resonance with the earlier detected planet is discovered

3-Body Orbit Solutions (2001-2005)[]

article (2001) article (2001) - mass determination (2001) (2003) (2004)

Evolution and Stability of Resonance Orbits (2001-2005)[] (2001) (2001) (2001) (2002) (2002) article (2002) article (2003) article (2003) (2003) (2003) (2003) (2004) (2005)

Astrometric Mass Estimation (2002)[]

Transit Attempts[]

Habital Zone Studies (2002-2005)[] (2002)

Planet d Discovered (2005)[]

The smallest exoplanet and the first certain rocky planet is discovered

Planet d Must be Dense[]

Calculations show that in order to avoid evaporation by its star, planet d must have a density of greater than 3 g cm^-3 and contain a large fraction of massive elements.

Red Dwarf Studies[] (2002) (2005)

Planet d Studies[] (2005)

Internal Conditions of Planet d Modelled (2006)[]

Planets Coplanar (2008)[]

Planet e discovered, resonates with a and b (2010)[]

See Also[]