HD 10180: Difference between revisions
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==See also== |
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*[[Gliese 581]] |
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==Notes== |
==Notes== |
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Revision as of 06:28, 29 November 2010
 View of the sky around the star HD 10180 Credit: ESO | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydrus |
| Right ascension | 01h 37m 53.5763s[1] |
| Declination | −60° 30′ 41.499″[1] |
| Apparent magnitude (V) | 7.33[2] |
| Characteristics | |
| Spectral type | G1V[3] |
| Astrometry | |
| Radial velocity (Rv) | +35.2 km/s |
| Proper motion (μ) | RA: -14.92[1] mas/yr Dec.: 6.17[1] mas/yr |
| Parallax (π) | 25.39 ± 0.62 mas[1] |
| Distance | 128 ± 3 ly (39.4 ± 1.0 pc) |
| Details | |
| Mass | 1.062 ± 0.017[4] M☉ |
| Radius | 1.20 ± 0.318[4] R☉ |
| Surface gravity (log g) | 4.39[5] cgs |
| Temperature | 5,911[5] K |
| Metallicity | [5] |
| Age | 7.3[6] Gyr |
| Other designations | |
![{\displaystyle {\begin{smallmatrix}\left[{\frac {Fe}{H}}\right]\ =\ 0.08\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/6839ffdc488d7b290339549986c1c3cf06a56f64)
HD 10180 is a solar-type star. A research team led by Christophe Lovis of the University of Geneva discovered that the star has at least five planets, and possibly as many as seven.[7][8] It is 127 light-years away, in the southern constellation of Hydrus.[9] The mass and metallicity of HD 10180 are 6% and 20% greater than the values of the Sun.
The system contains five planets with minimum masses from 12 to 25 times Earth's (comparable to the mass of the ice giant planets Uranus and Neptune in our Solar System) at orbital radii of 0.06, 0.13, 0.27, 0.49 and 1.42 AU. The false detection probabilities for these five planets are all much less than 0.1%.[8] In addition, there is a possible Earth-sized planet located at 0.02 AU (minimum mass 1.4 times Earth's; spurious detection probability 1.4%), and a possible Saturn-sized giant planet at 3.4 AU (minimum mass 65 times Earth's; spurious detection probability 0.6%). This represents the largest number of planets detected in an extrasolar planetary system (the previous record holder, the 55 Cancri system, has five).[8]
HD 10180's five Neptune-sized planets have orbital radii ranging from one sixth that of Mercury to just short of that of Mars. The innermost planet, while Earth-like in diameter, has an orbital radius about one-seventeenth that of Mercury, and would be correspondingly hotter.[10] The outermost planet revolves at a distance from HD 10180 comparable to the distance of the outer part of the main asteroid belt from our Sun.
Credit: ESO |
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The planetary system contains no planets in mean motion resonances, although it has a number of near resonances.[8] The approximate ratios of periods of adjacent orbits are (proceeding outward): 1:5, 1:3, 1:3, 2:5, 1:5, 3:11.
The planets were detected using the HARPS spectrograph, in conjunction with the ESO's 3.6 m telescope at La Silla Observatory in Chile, using Doppler spectroscopy. Since the inclination of the planets' orbits is unknown, only minimum planetary masses can presently be obtained. Dynamical simulations suggest that the system cannot be stable if the true masses of the planets exceed the minimum masses by a factor of greater than three (corresponding to an inclination of less than 20°, where 90° is edge-on).[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | >1.35 ± 0.23 M🜨 | 0.02225 ± 0.00035 | 1.17768 ± 0.00010 | 0.0000 ± 0.0025 | — | — |
| c | >13.10 ± 0.54 M🜨 | 0.0641 ± 0.0010 | 5.75979 ± 0.00062 | 0.045 ± 0.026 | — | — |
| d | >11.75 ± 0.65 M🜨 | 0.1286 ± 0.0020 | 16.3579 ± 0.0038 | 0.088 ± 0.041 | — | — |
| e | >25.1 ± 1.2 M🜨 | 0.2699 ± 0.0042 | 49.745 ± 0.022 | 0.026 ± 0.036 | — | — |
| f | >23.9 ± 1.4 M🜨 | 0.4929 ± 0.0078 | 122.76 ± 0.17 | 0.135 ± 0.046 | — | — |
| g | >21.4 ± 3.4 M🜨 | 1.422 ± 0.026 | 601.2 ± 8.1 | 0.19 ± 0.14 | — | — |
| h | >64.4 ± 4.6 M🜨 | 3.40 ± 0.11 | 2222 ± 91 | 0.080 ± 0.070 | — | — |
See also
Notes
References
- ^ a b c d e Perryman, M. A. C. (1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|month=ignored (help) - ^ a b "HD 10180 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-08-24.
- ^ Nordström, B. (2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs". Astronomy and Astrophysics. 418: 989–1019. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|month=ignored (help) - ^ a b Takeda, G. (2008). "Stellar parameters of nearby cool stars (Takeda+, 2007)". VizieR On-line Data Catalog: J/ApJS/168/297. Bibcode:2008yCat..21680297T.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|month=ignored (help) - ^ a b c Sousa, S. G. (2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes". Astronomy and Astrophysics. 487 (1): 373–381. Bibcode:2008A&A...487..373S. doi:10.1051/0004-6361:200809698.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|month=ignored (help) - ^ Holmberg, J.; Nordström, B.; Andersen, J. (2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics, Supplement Series. 501 (3): 941−947. doi:10.1051/0004-6361/200811191.
{{cite journal}}: Unknown parameter|month=ignored (help)CS1 maint: multiple names: authors list (link) Note: see VizieR catalogue V/130. - ^ "Richest Planetary System Discovered: Up to seven planets orbiting a Sun-like star" (Press release). European Southern Observatory. 2010-08-24. Retrieved 2010-08-24.
- ^ a b c d e f Lovis, C (2010-08-12). "The HARPS search for southern extra-solar planets XXVII. Up to seven planets orbiting HD 10180: probing the architecture of low-mass planetary systems" (PDF). Submitted to Astronomy & Astrophysics. Retrieved 2010-08-24.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); line feed character in|coauthors=at position 93 (help) - ^ Gill, Victoria (August 24, 2010). "Rich exoplanet system discovered". BBC News. BBC. Retrieved August 24, 2010.
- ^ Chang, Kenneth. "Kepler Telescope Detects Possible Earth-Size Planet", The New York Times, August 26, 2010. Accessed August 26, 2010.
External links
- Nemiroff, Robert (2010-08-25). "HD 10180: Richest Yet Planetary System Discovered". Astronomy Picture of the Day. NASA. Retrieved 2010-08-25.
{{cite web}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - Marchis, Franck (2010-08-24). "Discovery of 7 exoplanets around a Sun-like star". NASA's blog at Cosmic Diary. International Year of Astronomy. Retrieved 2010-08-24.