An abundance of small exoplanets around stars with a wide range of metallicities

@article{Buchhave2012AnAO,
  title={An abundance of small exoplanets around stars with a wide range of metallicities},
  author={Lars A. Buchhave and David W. Latham and Anders Johansen and Martin Bizzarro and Guillermo Torres and Jason F. Rowe and Natalie M. Batalha and William J. Borucki and Erik J. Brugamyer and Caroline Caldwell and Stephen T. Bryson and David R. Ciardi and William D. Cochran and Michael Endl and Gilbert A. Esquerdo and Eric B. Ford and John Charles Geary and Ronald L. Gilliland and Terese T. Hansen and Howard T. Isaacson and John B. Laird and Philip W. Lucas and Geoffrey W. Marcy and Jon A. Morse and Paul Robertson and Avi Shporer and Robert P. Stefanik and Martin D. Still and Samuel N. Quinn},
  journal={Nature},
  year={2012},
  volume={486},
  pages={375-377}
}
The abundance of heavy elements (metallicity) in the photospheres of stars similar to the Sun provides a ‘fossil’ record of the chemical composition of the initial protoplanetary disk. Metal-rich stars are much more likely to harbour gas giant planets, supporting the model that planets form by accumulation of dust and ice particles. Recent ground-based surveys suggest that this correlation is weakened for Neptunian-sized planets. However, how the relationship between size and metallicity… Expand

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References

SHOWING 1-10 OF 37 REFERENCES
Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
Correlations between stellar properties and the occurrence rate of exoplanets can be used to inform the target selection of future planet-search efforts and provide valuable clues about theExpand
STELLAR PARAMETERS AND METALLICITIES OF STARS HOSTING JOVIAN AND NEPTUNIAN MASS PLANETS: A POSSIBLE DEPENDENCE OF PLANETARY MASS ON METALLICITY
The metal content of planet-hosting stars is an important ingredient that may affect the formation and evolution of planetary systems. Accurate stellar abundances require the determinations ofExpand
The Lifetime of Protoplanetary Disks in a Low-metallicity Environment
The extreme outer Galaxy (EOG), the region with a Galactic radius of more than 18 kpc, is known to have a very low metallicity, about one-tenth that of the solar neighborhood. We obtained the deepExpand
Kepler Exoplanet Candidate Host Stars Are Preferentially Metal Rich
We find that Kepler exoplanet candidate (EC) host stars are preferentially metal rich, including the low-mass stellar hosts of small-radius ECs. The last observation confirms a tentative hint thatExpand
Kepler Planet-Detection Mission: Introduction and First Results
TLDR
The planetary findings derived from the first six weeks of observations with the Kepler mission are summarized, which include the detection of five new exoplanets, which confirm the existence of planets with densities substantially lower than those predicted for gas giant planets. Expand
Toward a Deterministic Model of Planetary Formation. II. The Formation and Retention of Gas Giant Planets around Stars with a Range of Metallicities
The apparent dependence of detection frequency of extrasolar planets on the metallicity of their host stars is investigated with Monte Carlo simulations using a deterministic core-accretion planetExpand
Orbital migration of the planetary companion of 51 Pegasi to its present location
THE recent discovery1 and confirmation2 of a possible planetary companion orbiting the solar-type star 51 Pegasi represent a breakthrough in the search for extrasolar planetary systems. Analysis ofExpand
The Planet-Metallicity Correlation
We have recently carried out spectral synthesis modeling to determine Teff, log g, v sin i, and [Fe/H] for 1040 FGK-type stars on the Keck, Lick, and Anglo-Australian Telescope planet searchExpand
The HARPS search for southern extra-solar planets - V. A 14 Earth-masses planet orbiting HD 4308
We present here the discovery and characterisation of a very light planet around HD4308. The planet orbits its star in 15.56 days. The circular radial-velocity variation presents a tinyExpand
A closely packed system of low-mass, low-density planets transiting Kepler-11
TLDR
Kepler spacecraft observations of a single Sun-like star are reported that reveal six transiting planets, five with orbital periods between 10 and 47 days and a sixth planet with a longer period, among the smallest for which mass and size have both been measured. Expand
...
1
2
3
4
...