J/A+A/691/A160 Chemical composition of planetary hosts (Sharma+, 2024)
Chemical composition of planetary hosts. C, N and alpha-element abundances.
Sharma A., Stonkute E., Drazdauskas A., Minkeviciute R., Mikolaitis S.,
Tautvaisiene G., Narbuntas T.
<Astron. Astrophys. 691, A160 (2024)>
=2024A&A...691A.160S 2024A&A...691A.160S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Spectroscopy ;
Abundances
Keywords: techniques: spectroscopic - stars: abundances -
stars: fundamental parameters - planetary systems -
stars: solar-type - Galaxy: evolution
Abstract:
Accurate atmospheric parameters and chemical composition of planet
hosts play a major role in characterizing exoplanets and understanding
their formation and evolution.
Our objective is to uniformly determine atmospheric parameters and
chemical abundances of carbon (C), nitrogen (N), oxygen(O) and
alpha-elements-magnesium (Mg) and silicon (Si), together with C/O,
N/O and Mg/Si abundance ratios for planet-hosting stars. Through this
analysis, we aim to investigate the potential connections between
stellar chemistry and the presence of planets.
Our analysis is based on high-resolution spectra of 149 F, G and K
dwarf and giant stars hosting planets or planetary systems. The
spectra were obtained with the Vilnius University Echelle Spectrograph
(VUES) on the 1.65 m Moletai Observatory telescope. The determination
of stellar parameters is based on a standard analysis using equivalent
widths and one-dimensional, plane-parallel model atmospheres
calculated under the assumption of local thermodynamical equilibrium.
The differential synthetic spectrum method was used to uniformly
determine the carbon C(C2), nitrogen N(CN), oxygen [OI], magnesium MgI,
and silicon SiI elemental abundances as well as the C/O, N/O and
Mg/Si ratios.
We analysed elemental abundances and ratios in dwarf and giant stars,
finding that [C/Fe], [O/Fe], and [Mg/Fe] are lower in metal-rich dwarf
hosts while [N/Fe] is close to the Solar ratio. Giants show smaller
scatter in [C/Fe] and [O/Fe] and lower than the Solar average [C/Fe]
and C/O ratios. The (C+N+O) abundances increase with [Fe/H] in giant
stars, with a minimal scatter. We also noted an overabundance of Mg
and Si in planet-hosting stars, particularly at lower metallicities,
and a lower Mg/Si ratio in stars with planets. In giants hosting
high-mass planets, nitrogen shows a moderate positive relationship
with planet mass. C/O and N/O ratios show moderate negative and
positive slopes in giant stars, respectively. Mg/Si ratio shows a
negative correlation with planet mass across the entire stellar
sample.
Description:
High resolution spectroscopic analysis of 124 FGK type stars in the
northern hemisphere are presented. The observations are collected with
the 1.65m telescope and VUES spectrograph at the Moletai
Astronomical Observatory of Institute of Theoretical Physics and
Astronomy, Vilnius University. This spectrograph has a wavelength
coverage from 400 to 900nm and R∼36000, ∼51000, and ∼68000 resolution
modes. We used the R∼68000 mode for this work. Stellar kinematic and
atmospheric parameters along with C, N, O and Mg, Si abundances are
derived to analyse star-planet connection.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 290 124 Stellar physical and chemical properties
(corrected version, 25-Feb-2025)
tableb2.dat 115 172 Planetary parameters
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
Byte-by-byte Description of file: tableb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Host Host Tycho-2 catalogue identification
13- 16 I4 K Teff Effective temperature
18- 20 I3 K e_Teff Error in effective temperature
22- 25 F4.2 [cm/s2] logg Surface gravity
27- 30 F4.2 [cm/s2] e_logg Error in surface gravity
32- 36 F5.2 [-] [Fe/H] Metallicity
38- 41 F4.2 [-] e_[Fe/H] Error in metallicity
43- 46 F4.2 [km/s] Vt Microturbulence velocity
48- 51 F4.2 [km/s] e_Vt Error in microturbulence velocity
53- 59 F7.3 [km/s] RV Radial velocity
61- 66 F6.4 [km/s] e_RV Error in radial velocity
68- 72 F5.2 Gyr Age ? Stellar Age
74- 78 F5.2 Gyr e_Age ? Error in stellar age
80- 89 F10.6 [km/s] U Heliocentric space velocity U
91- 98 F8.6 [km/s] e_U Error in heliocentric space velocity U
100-109 F10.6 [km/s] V Heliocentric space velocity V
111-118 F8.6 [km/s] e_V Error in heliocentric space velocity V
120-129 F10.6 [km/s] W Heliocentric space velocity W
131-138 F8.6 [km/s] e_W Error in heliocentric space velocity W
140-147 F8.6 kpc d Stellar distance
149-156 F8.6 kpc Rmean Mean Galactocentric distance
158-165 F8.6 kpc e_Rmean Error in mean Galactocentric distance
167-174 F8.6 --- e Orbital Eccentricity
176-183 F8.6 --- e_e Error in orbital eccentricity
185-192 F8.6 kpc zmax Maximum height from Galactic plane
194-201 F8.6 kpc e_zmax Error in maximum height from Galactic plane
203-207 F5.2 [-] [C/H] ? Carbon abundance
209-213 F5.2 [-] e_[C/H] ? Error in carbon abundance
215-219 F5.2 [-] [N/H] ? Nitrogen abundance
221-225 F5.2 [-] e_[N/H] ? Error in nitrogen abundance
227-231 F5.2 [-] [O/H] ? Oxygen abundance
233-237 F5.2 [-] e_[O/H] ? Error in oxygen abundance
239-243 F5.2 [-] [Mg/H] ? Magnesium abundance
245-249 F5.2 [-] e_[Mg/H] ? Error in magnesium abundance
251-255 F5.2 [-] [Si/H] ? Silicon abundance
257-261 F5.2 [-] e_[Si/H] ? Error in silicon abundance
263-267 F5.2 [-] C/O ? Absolute Carbon-to-Oxygen abundance ratio
269-273 F5.2 [-] N/O ? Absolute Nitrogen-to-Oxygen abundance ratio
275-279 F5.2 [-] Mg/Si ? Absolute Magnesium-to-Silicon abundance ratio
281-288 F8.3 --- TD/D Thick disk-to-thin disk probability ratio
290 I1 --- Group [0/2] Chemical attribution to the Galactic
subcomponent (1)
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Note (1): Group as follows:
0 = thin disk (109 occurrences)
1 = thick disk (7 occurrences)
2 = in-between (8 occurrences)
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Byte-by-byte Description of file: tableb2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Host Host Tycho-2 catalogue identification
13- 25 A13 --- Planet Associate Planet
27- 39 F13.6 Mgeo Mp ? Planetary Mass (Earth Mass)
41- 54 F14.7 d Porb ? Orbital Period
56- 69 F14.9 au a ? Semi Major Axis
71- 75 F5.2 [-] C/O ? Absolute Carbon-to-Oxygen abundance ratio
77- 81 F5.2 [-] N/O ? Absolute Nitrogen-to-Oxygen abundance ratio
83- 87 F5.2 [-] Mg/Si ? Absolute Magnesium-to-Silicon abundance ratio
89-115 A27 --- Ref Planetary parameter references (1)
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Note (1): References as follows:
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Kuzuharaetal._2013 = 2013ApJ...774...11K 2013ApJ...774...11K
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Orell-Miqueletal._2022 = 2023A&A...669A..40O 2023A&A...669A..40O
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History:
08-Nov-2024: From Ashutosh Sharma, ashutosh.sharma(at)ff.stud.vu.lt
25-Feb-2025: Values of zmax and e where interverted,
now correctly indicating
Acknowledgements:
We thank the referee, Tamara Mishenina, for insightful comments and
very helpful suggestions. E.S., A.D., R.M., S.M. and G.T. acknowledge
funding from the Research Council of Lithuania (LMTLT, grant No.
P-MIP-23-24). This research has made use of the NASA Exoplanet
Archive, which is operated by the California Institute of Technology,
under contract with the National Aeronautics and Space Administration
under the Exoplanet Exploration Program. We also acknowledge the use
of the SIMBAD database, operated at CDS, Strasbourg, France.
Additionally, we appreciate Vilnius University's Moletai
Astronomical Observatory for allocating us an observation time for
this project. The observing time was partially funded by the
Europlanet Telescope Network program of the Europlanet 2024 Research
Infrastructure project. Europlanet 2024 RI has received funding from
the European Union;s Horizon 2020 research and innovation program
under grant agreement No 871149.
(End) Patricia Vannier [CDS] 27-Sep-2024