 | |
| Discovery | |
|---|---|
| Discovered by | Mikko Tuomi et al. |
| Discovery site | La Silla Observatory,Chile |
| Discovery date | October 28, 2012 |
| radial velocity, usingHARPS | |
| Orbital characteristics | |
| 0.1886 [0.1782, 0.1969]AU | |
| Eccentricity | 0.06 [0, 0.18][1] |
| 34.62 [34.42, 34.83][1]d | |
| Semi-amplitude | 0.84 [0.53, 1.16][1] |
| Star | HD 40307 |
HD 40307 e is anextrasolar planet candidate suspected to be orbiting the starHD 40307. It is located 42light-years away in the direction of the southern constellationPictor. The planet was discovered by theradial velocity method, using theEuropean Southern Observatory'sHARPS apparatus[1][2][3] by a team of astronomers led by Mikko Tuomi at the University of Hertfordshire and Guillem Anglada-Escude of theUniversity of Göttingen,Germany.[4]
The existence of the planet was disputed in 2015, as moreDoppler spectroscopy data has become available.[5]
Its minimum mass is 3.5 that of Earth - the smallest - and dynamical models suggest it cannot be much more (and so is measured close to edge-on).[1] It further gets roughly the same insolation from its star as Mercury gets from the Sun.[6] Planets like this in that system have been presumed "super-Earth".[7]
However planets b, c, and d are presumed to have migrated in from outer orbits; and planet b is predicted a sub-Neptune.[8] It is likely that this planet formed even further out. Whether it is a sub-Neptune, a super-Venus or even a super-Mercury is unknown.
2012 in space | ||
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Space probe launches |
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| Impact events | ||
| SelectedNEOs | ||
| Exoplanets |
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| Discoveries | ||
| Comets | ||
| Space exploration | ||
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