Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Planet signatures and effect of the chemical evolution of the Galactic
  thin-disk stars   Context: Studies based on high-precision abundance determinations revealed
that chemical patterns of solar twins are characterised by the correlation
between the differential abundances relative to the Sun and the condensation
temperatures (Tc) of the elements. It has been suggested that the origin of
this relation is related to the chemical evolution of the Galactic disk, but
other processes, associated with the presence of planets around stars, might
also be involved.
  Aims: We analyse HIRES spectra of 14 solar twins and the Sun to provide new
insights on the mechanisms that can determine the relation between [X/H] and
Tc.
  Methods: Our spectroscopic analysis produced stellar parameters (Teff, log g,
[Fe/H], and $\xi$), ages, masses, and abundances of 22 elements (C, O, Na, Mg,
Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, and Ba). We
used these determinations to place new constraints on the chemical evolution of
the Galactic disk and to verify whether this process alone can explain the
different [X/H]-Tc slopes observed so far.
  Results: We confirm that the [X/Fe] ratios of all the species correlate with
age. The slopes of these relations allow us to describe the effect that the
chemical evolution of the Galactic disk has on the chemical patterns of the
solar twins. After subtracting the chemical evolution effect, we find that the
unevolved [X/H]-Tc slope values do not depend on the stellar ages anymore.
However, the wide diversity among these [X/H]-Tc slopes, covering a range of
$\pm$4~10$^{-5}$ dex K$^{-1}$, indicates that processes in addition to the
chemical evolution may affect the [X/H]-Tc slopes.
  Conclusions: The wide range of unevolved [X/H]-Tc slope values spanned at all
ages by our sample could reflect the wide diversity among exo-planetary systems
observed so far and the variety of fates that the matter in circumstellar disks
can experience.

12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom