Andy's Wiki
Exoplanetary Scratchpad

[SysBP Img]

A system containing a 5.1 ME Hot Super-Earth b (which is hot enough to have emissions on its night side) and one and possibly two other further out Neptunians (c and d [unconfirmed] and possibly a fourth), and a massive Kuiper Belt around a very Sun-like star only 28 light years away. All planets would fit inside Venus' orbit and have high eccentricities, especially the outermost one. This is the closest planetary system around a G-type star, which is one of the only very sun-like stars visible to the naked eye. It is the first non-borderline G-class main sequence star found to have a super-Earth. A lack of a Jovian planet and an unseen further out Neptunian may explain the large amount of cometary debris detected. Systems like this may avoid a heavy bombardment period, but instead undergo a steady rain of occasional cometary impacts for billions of year. Of the six sunlike stars within 10 parsecs, this star would be the one most likely to have an older version of Earth orbiting it. This postulated planet would have only microbes left as its star became hotter.

My Thoughts[]

I was just recently going through nearby single Yellow Dwarf stars. Two nearer ones have super Earths in circular orbits with disks in the outer systems. I'll consider these typical systems. This one is quite untypical, with the high eccentricities and Neptunians present, but it also have a debris disk, presumably with no Jovian present. Why are they postulating the existence of an older Earth-like planet with those highly eccentric interior planets though? Is this really a likely place for an dying Earth? I see that the outermost planet is still unconfirmed, maybe that allows for it? None of these nearby sun-like stars seem likely to have an Earth-like planet without the presence of a Jupiter to ensure the atmospheres in the zones wouldn't be too thick of hydrogen.

61 Virginis System Web Pages[]

61 Virginis System In the News[]

Super-Earth and possibly 2 Other Planets Discovered around Nearby Sunlike star (Dec 2009)[]

Massive Kuipter Belt Observed by Spitzer (Nov 12)[]

Could a Dying Earth Exist Here? (Apr 15)[]

See Also[]