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Table 6

Average abundances [X/H] 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 Non-planet hosts Difference of Averages
X  ⟨ [X/H] ⟩  σ N  ⟨ [X/H] ⟩  σ N  ⟨ [X/H] ⟩  σ N Jovian – Neptunian –
Non-hosts Non-hosts

NaI 0.12 0.23 109 –0.06 0.21 26 –0.12 0.30 975 0.24 0.06
MgI 0.10 0.18 109 –0.02 0.14 26 –0.11 0.23 976 0.21 0.09
AlI 0.10 0.19 109 –0.04 0.16 26 –0.11 0.25 969 0.21 0.07
SiI 0.10 0.18 109 –0.07 0.17 26 –0.12 0.24 976 0.22 0.05
CaI 0.08 0.15 109 –0.05 0.15 26 –0.09 0.21 976 0.17 0.04
ScI 0.14 0.21 109 –0.01 0.18 26 –0.08 0.25 947 0.22 0.07
ScII 0.11 0.20 109 –0.06 0.19 26 –0.12 0.27 976 0.23 0.06
TiI 0.11 0.17 109 –0.03 0.14 26 –0.08 0.22 976 0.19 0.05
TiII 0.10 0.18 109 –0.07 0.16 26 –0.11 0.23 976 0.21 0.04
VI 0.13 0.22 109 –0.06 0.19 26 –0.11 0.28 973 0.24 0.05
CrI 0.08 0.19 109 –0.09 0.18 26 –0.13 0.26 976 0.21 0.04
CrII 0.05 0.18 109 –0.14 0.18 26 –0.15 0.26 976 0.20 0.01
MnI 0.08 0.25 109 –0.17 0.27 26 –0.20 0.35 976 0.28 0.03
CoI 0.13 0.23 109 –0.06 0.20 26 –0.11 0.28 975 0.24 0.05
NiI 0.09 0.21 109 –0.10 0.21 26 –0.16 0.30 976 0.25 0.06
FeI 0.07 0.19 109 –0.12 0.2 26 –0.16 0.27 976 0.23 0.04

log g 4.37 0.14 109 4.39 0.08 26 4.41 0.15 976 –0.04 –0.02
ξt 1.01 0.25 109 0.81 0.23 26 0.88 0.37 976 0.13 –0.07
Teff 5656 412 109 5442 359 26 5490 502 976 166 –48

Notes. The four bottom rows list the average stellar parameters of the three aforementioned groups, taken from Sousa et al. (2008, 2011a,b).

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