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| Paper: |
Chemical Abundances of Volatiles and Refractories in
Solar Analogs with and without Planets:
No Relation with Terrestial Planets |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
879 |
| Authors: |
González Hernández, J. I.; Israelian, G.; Santos, N. C.; Sousa, S.; Delgado-Mena, E.; Neves, V.; Udry, S. |
| Abstract: |
We present the abundances of volatile and refractory elements in
the atmospheres of 95 solar analogs, 24 planet hosts and 71
“single” stars, to investigate its possible connection with
terrestial planets, using very high-quality HARPS and UVES spectra.
The whole sample of stars with and without planets show almost
the same mean abundance pattern. In particular, this sample contains
seven solar twins which provide very similar
mean abundance ratios for both stars with and without planets.
In addition, we select sub-sample of 28 solar analogs, with
14 stars with and 14 without planets, at super-solar metallicity,
and again we do not find any significant difference.
For this sub-sample of stars we derive the slopes of
the [X/Fe] abundance ratios as a function of the
condensation temperature, TC. Most of them have the
opposite sign as that expected from a possible signature
of terrestial planets.
Two metal-rich stars of this sub-sample which host each of them
a super-Earth-like planet, show an abundance pattern which would
not suggest the existence of any terrestial planet.
We demonstrate that these slopes get almost null values when
removing the Galactic chemical evolution trends, which
may indicate that any possible difference in volatile-to-refratory
abundance ratios is probably not related to the presence of
terrestial planets. |
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