J/A+A/688/A193 Ariel homogeneous stellar C, N, O abundances (da Silva+, 2024)
Ariel stellar characterisation. II. Chemical abundances of carbon, nitrogen, and
oxygen for 181 planet-host FGK dwarf stars.
da Silva R., Danielski C., Delgado Mena E., Magrini L, Turrini D, Biazzo K.,
Tsantaki M. Rainer M., Helminiak K.G.8, Benatti S., Adibekyan V, Sanna N,
Sousa S, Casali G., Van der Swaelmen, M.
<Astron. Astrophys. 688, A193 (2024)>
=2024A&A...688A.193D 2024A&A...688A.193D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Stars, F-type ; Stars, G-type ; Stars, K-type ;
Abundances ; Milky Way ; Spectroscopy ; Optical
Keywords: planets and satellites: composition - stars: abundances -
planetary systems - Galaxy: disk - Galaxy: evolution -
solar neighborhood
Abstract:
One of the ultimate goals of the ESA Ariel space mission is to shed
light on the formation pathways and evolution of planetary systems in
the Solar neighbourhood. Such an endeavour is only possible by
performing a large chemical survey of not only the planets, but also
their host stars, inasmuch as stellar elemental abundances are the
cipher key to decode the planetary compositional signatures. This work
aims at providing homogeneous chemical abundances of C, N, and O of a
sample of 181 stars belonging to the Tier 1 of the Ariel Mission
Candidate Sample. We applied the spectral synthesis and the equivalent
width methods to a variety of atomic and molecular indicators (the CI
lines at 5052 and 5380.3Å, the [OI] forbidden line at 6300.3Å,
the C2 bands at 5128 and 5165Å, and the CN band at 4215Åusing
high-resolution and high signal-to-noise spectra collected with
several spectrographs. We provide carbon abundances for 180 stars,
nitrogen abundances for 105 stars, and oxygen abundances for 89 stars.
We analyse the results in the light of the Galactic chemical
evolution, and in terms of the planetary companions properties. Our
sample basically follows the typical trends with metallicity expected
for the [C/Fe], [N/Fe], and [O/Fe] abundance ratios. The fraction
between carbon and oxygen abundances, both yields of primary
production, is consistent with a constant ratio as [O/H] increases,
whereas the abundance of nitrogen tends to increase with the
increasing of the oxygen abundance, supporting the theoretical
assumption of a secondary production of nitrogen. The [C/N], [C/O],
and [N/O] abundance ratios are also correlated with [Fe/H], which
might introduce biases in the interpretation of the planetary
compositions and formation histories if host stars of different
metallicity are compared. We provide relations that can be used to
qualitatively estimate whether the atmospheric composition of planets
is enriched or not with respect to the host stars.
Description:
The abundances of carbon, nitrogen, and oxygen for sample of 181
planet-host FGK dwarf stars are presented. We applied the spectral
synthesis and/or the equivalent width methods to high-resolution and
high signal-to-noise spectra collected with several instruments
(ESO/HARPS, TNG/HARPS-N, VLT/UVES, ESO/FEROS, OHP/SOPHIE, NOT/FIES,
LBT/PEPSI, Keck/HIRES, and/or TBL/NARVAL). The carbon abundances are a
mean of atomic and molecular indicators whereas the nitrogen
abundances are derived from one CN molecular band indicator, and the
oxygen abundances are derived from the [OI] forbidden line indicator.
The [C/Fe], [N/Fe], and [O/Fe] abundance ratios are scaled to the
solar standard abundances taken from Asplund et al.
(2009ARA&A..47..481A 2009ARA&A..47..481A), except iron, for which we adopted a value of
7.47 in a logarithmic scale in which hydrogen has a value of 12. The
uncertainties estimated for each star and from each indicator are also
presented. Finally, we defined a parameter that we named Vbroad, which
is a combined contribution of the stellar projected equatorial
velocity and the stellar macroturbulence, both used to estimate the
spectral line broadening.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 121 181 Composite of velocity fields (mean values),
C (individual and mean values), N, and O
abundances for our sample of 181 stars
--------------------------------------------------------------------------------
See also:
J/A+A/663/A161 : 187 FGK planet host stars parameters (Magrini+, 2022)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Name Star name
14- 17 F4.1 km/s Vbroad Composite of velocity fields
20- 24 F5.2 --- [C/Fe]5128 ? Carbon abundance from
the 5128Å C2 band [C/Fe]
27- 30 F4.2 --- e_[C/Fe]5128 ? Error in the C2 (5128) abundance
33- 37 F5.2 --- [C/Fe]5165 ? Carbon abundance from
the 5165Å C2 band [C/Fe]
40- 43 F4.2 --- e_[C/Fe]5165 ? Error in the C2 (5165) abundance
46- 50 F5.2 --- [C/Fe]5380 ? Carbon abundance from
the 5380Å CI line [C/Fe]
53- 56 F4.2 --- e_[C/Fe]5380 ? Error in the CI (5380) abundance
59- 63 F5.2 --- [C/Fe]5052ew ? Carbon abundance from
5052Å (using EW) [C/Fe]
66- 69 F4.2 --- e_[C/Fe]5052ew ? Error in the CI (5052 EW) abundance
72- 76 F5.2 --- [C/Fe]5380ew ? Carbon abundance from
5380Å (using EW) [C/Fe]
79- 82 F4.2 --- e_[C/Fe]5380ew ? Error in the CI (5380 EW) abundance
85- 89 F5.2 --- [C/Fe] ? Mean carbon abundance from
C features [C/Fe]
92- 95 F4.2 --- e_[C/Fe] ? Error in the mean [C/Fe] abundance
98-102 F5.2 --- [N/Fe]4215 ? Nitrogen abundance from
the 4215Å CN [N/Fe]
105-108 F4.2 --- e_[N/Fe]4215 ? Error in the [N/Fe] abundance
111-115 F5.2 --- [O/Fe]6300 ? Oxygen abundance from
the 6300Å OI line [O/Fe]
118-121 F4.2 --- e_[O/Fe]6300 ? Error in the [O/Fe] abundance
--------------------------------------------------------------------------------
Acknowledgements:
Ronaldo Oliveira da Silva,
References:
Magrini et al., Paper I 2022A&A...663A.161M 2022A&A...663A.161M, Cat. J/A+A/663/A161
(End) Patricia Vannier [CDS] 24-Jun-2024