Exoplanetary Scratchpad

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A bright orange dwarf star with six known non-transiting super-Earth planets, including one of the most potentially habitable planets known. The star is about the same age as the Sun and is not magnetically active. The first three were announced with 45 other HARPS detected by Swiss team who discovered 51 Pegasus as part of the HARPs project. Early dynamic studies suggested these were smaller versions of Neptune, rather than larger versions of Earth. The next three were found by another team using a new method with existing data that threw out unreliable data. The inner 5 planets range from epistellar distances to half Mercury's distance. The outermost planet g orbits at Venus-like distances and is well within the habitable zone. It has a minimum of 7 times Earth's mass and receives 62% of the radiation Earth does. Liquid water could exist on the surface if it proves to be rocky. Unlike many other potentially habitable planets, it is not tidally locked. It is also by far the nearest potentially habitable planet around a sun-like star. It is a good future target for direct imaging. It was calculated that the planet might still have a magnetic field just barely strong enough to shield it from stellar radiation to protect its ocean.

HD 40307 System Web PagesEdit

HD 40307 System In the NewsEdit

3-Super Earth system announced with 45 super earths (Jun 2008)Edit

Terrestrials or Ice Giants? (Jan 2009)Edit

Potentially Habitable Planet Found (Nov 2012)Edit

Magnetic Field May Survive on g, Protect Potential WaterEdit

See also Gliese 581 System, HD 40307 System, Gliese 667 System

See AlsoEdit

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