description HD 40307 g Overview
HD 40307 g was reported in 2012 as a super-Earth candidate detected through radial-velocity measurements of the nearby K-type star HD 40307. Its proposed orbit placed it within or near the star's habitable zone, prompting interest in whether temperatures could permit liquid water under suitable atmospheric conditions. Later analyses have questioned the signal, so its existence and planetary status are not regarded as securely established.
help HD 40307 g FAQ
Is HD 40307 g a confirmed planet?
HD 40307 g was reported in 2012 as a super-Earth candidate found through radial-velocity measurements. Its planetary status and exact properties have been debated, so it should not be described as an unquestioned Earth twin.
Why did HD 40307 g attract attention?
Its proposed orbit placed it within or near the habitable zone of the nearby K-type star HD 40307. That led to interest in whether its temperatures could allow liquid water.
How was HD 40307 g detected?
Researchers looked for the small periodic motion of HD 40307 caused by an orbiting body. The candidate was inferred from radial-velocity data rather than a confirmed transit.
Is HD 40307 g like Earth?
It was described as a super-Earth candidate, but that does not establish an Earth-like surface or atmosphere. Its possible habitable-zone orbit was the main reason for comparisons with Earth.
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