HD 40307 e
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 40307 | |
| Constellation | Pictor | |
| Right ascension | (α) | 05h 54m 04.2409s[1] |
| Declination | (δ) | −60° 01′ 24.498″[1] |
| Apparent magnitude | (mV) | 7.17[1] |
| Distance | 41.8 ± 0.3 ly (12.83 ± 0.09[1] pc) |
|
| Spectral type | K2.5V[1] | |
| Radius | (r) | 0.716 ± 0.010[2] R☉ |
| Temperature | (T) | 4977 ± 59[3] K |
| Metallicity | [Fe/H] | −0.31 ± 0.03[3] |
| Age | 1.2 (≥ 0.2)[4] Gyr | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.1886 [0.1782, 0.1969][5] AU |
| Eccentricity | (e) | 0.06 [0, 0.18][5] |
| Orbital period | (P) | 34.62 [34.42, 34.83][5] d |
| Semi-amplitude | (K) | 0.84 [0.53, 1.16][5] m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 3.5 [2.1, 4.9][5] M⊕ |
| Discovery information | ||
| Discovery date | October 28, 2012 | |
| Discoverer(s) | Mikko Tuomi et al. | |
| Discovery method | radial velocity, using HARPS | |
| Discovery site | La Silla Observatory, Chile | |
| Discovery status | Announced[5] | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 40307 e is an extrasolar planet orbiting the star HD 40307. It is located 42 light-years away in the direction of the southern constellation Pictor. The planet was discovered by the radial velocity method, using the European Southern Obervatory's HARPS apparatus[5][6][7] by a team of astronomers led by Mikko Tuomi at the University of Hertfordshire and Guillem Anglada-Escude of the University of Goettingen, Germany.[7]
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).[5] It further gets roughly the same insolation from its star as Mercury gets from the Sun.[8] Planets like this in that system have been presumed "super-Earth".[3]
However planets b, c, and d are presumed to have migrated in from outer orbits; and planet b is predicted a sub-Neptune.[9] 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.
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References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ HD 40307, entry, CDS database J/A+A/450/735; described in Effective temperature scale and bolometric corrections from 2MASS photometry, E. Masana, C. Jordi, and I. Ribas, Astronomy and Astrophysics 450, #2 (May 2006), pp. 735–746. Bibcode: 2006A&A...450..735M. doi:10.1051/0004-6361:20054021.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ HD 40307, database entry, Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS database V/117A, accessed November 19, 2008; described in The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs, B. Nordström, M. Mayor, J. Andersen, J. Holmberg, F. Pont, B. R. Jørgensen, E. H. Olsen, S. Udry, and N. Mowlavi, Astronomy and Astrophysics 418 (May 2004), pp. 989–1019, Bibcode: 2004A&A...418..989N, doi:10.1051/0004-6361:20035959.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found. Cite error: Invalid
<ref>tag; name "Space-20121107b" defined multiple times with different content - ↑ Tuomi, Fig. 17
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Lua error in package.lua at line 80: module 'strict' not found.
Coordinates: 
05h 54m 04.2409s, −60° 01′ 24.498″
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