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Table 1
Average abundance ratios [X/Fe] for stars without planets, with giant planets, and stars that exclusively host Neptunians, along with their rms dispersion, the number of stars used in their determination, and the difference of averages between Neptunian and Jovian hosts and stars without planets.
| Species | Jovian hosts | Neptunian hosts | Without planets | Difference of averages | |||||||
| X | ⟨[X/Fe]⟩ | σ | N | ⟨[X/Fe]⟩ | σ | N | ⟨[X/Fe]⟩ | σ | N | Jovian – | Neptunian – |
| Non-hosts | Non-hosts | ||||||||||
|
|
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| Na | 0.054 | 0.076 | 109 | 0.061 | 0.069 | 26 | 0.031 | 0.098 | 975 | 0.023 | 0.030 |
| Mg | 0.031 | 0.083 | 109 | 0.100 | 0.083 | 26 | 0.048 | 0.103 | 976 | –0.017 | 0.052 |
| Al | 0.037 | 0.066 | 109 | 0.084 | 0.097 | 26 | 0.044 | 0.104 | 969 | –0.007 | 0.040 |
| Si | 0.030 | 0.041 | 109 | 0.050 | 0.059 | 26 | 0.034 | 0.066 | 976 | –0.004 | 0.016 |
| Ca | 0.013 | 0.058 | 109 | 0.075 | 0.082 | 26 | 0.062 | 0.083 | 976 | –0.049 | 0.013 |
| Sc | 0.056 | 0.073 | 109 | 0.085 | 0.060 | 26 | 0.047 | 0.085 | 947 | 0.009 | 0.038 |
| Ti | 0.037 | 0.055 | 109 | 0.075 | 0.090 | 26 | 0.062 | 0.085 | 976 | –0.025 | 0.013 |
| V | 0.059 | 0.075 | 109 | 0.064 | 0.076 | 26 | 0.041 | 0.084 | 973 | 0.018 | 0.023 |
| Cr | –0.003 | 0.023 | 109 | 0.009 | 0.027 | 26 | 0.014 | 0.039 | 976 | –0.017 | –0.005 |
| Mn | 0.011 | 0.073 | 109 | –0.043 | 0.100 | 26 | –0.047 | 0.096 | 976 | 0.058 | 0.004 |
| Co | 0.065 | 0.073 | 109 | 0.066 | 0.054 | 26 | 0.048 | 0.078 | 975 | 0.017 | 0.018 |
| Ni | 0.019 | 0.042 | 109 | 0.019 | 0.028 | 26 | 0.000 | 0.039 | 976 | 0.019 | 0.019 |
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