J/ApJ/736/87 Abundances in G-type stars with exoplanets (Kang+, 2011)
Abundances of refractory elements for G-type stars with extrasolar planets.
Kang W., Lee S.-G., Kim K.-M.
<Astrophys. J., 736, 87 (2011)>
=2011ApJ...736...87K 2011ApJ...736...87K
ADC_Keywords: Abundances ; Stars, G-type ; Planets ; Stars, double and multiple
Keywords: planetary systems - stars: abundances - stars: fundamental parameters
Abstract:
We confirm the difference in chemical abundance between stars with
and without exoplanets and present the relation between chemical
abundances and physical properties of exoplanets, such as planetary
mass and the semimajor axis of planetary orbit. We obtained the
spectra of 52 G-type stars from the Bohyunsan Optical Astronomy
Observatory (BOAO) Echelle Spectrograph and carried out abundance
analyses for 12 elements: Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co,
and Ni. We first found that the [Mn/Fe] ratios of planet-host stars
are higher than those of comparison stars over the entire metallicity
range, and we then found that in metal-poor stars of [Fe/H]←0.4 the
abundance difference was larger than in metal-rich samples, especially
for the elements of Mg, Al, Sc, Ti, V, and Co. After examining the
relation between planet properties and metallicities of planet-host
stars, we observed that planet-host stars with low metallicities tend
to have several low-mass planets (<MJ) instead of a massive
gas-giant planet.
Description:
The observations were carried out with the 1.8m telescope at BOAO
(Bohyunsan Optical Astronomy Observatory) in 2008 and 2009. The
observed spectra have a spectral resolution of R either about 30000
(using 300um fiber) or 45000 (using 200um fiber), and S/Ns higher than
150 at 6070Å. The wavelength range of the spectra is from 3800Å
to 8800Å, covering the full optical region.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 91 52 Atmopsheric parameters of the target stars
table2.dat 35 223 Line list for equivalent widths measurements
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See also:
III/231 : The Tycho-2 Spectral Type Catalog (Wright+, 2003)
J/A+A/541/A40 : Metallicity of solar-type stars (Maldonado+, 2012)
J/ApJ/720/1592 : Abundances of solar analogs with planets (Hernandez+, 2010)
J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)
J/ApJS/169/430 : Atmospheric parameters of metal-rich stars (Robinson+, 2007)
J/A+A/458/873 : Stellar parameters of solar-type stars (Sousa+, 2006)
J/MNRAS/370/163 : Abundance distribution of stars with planets (Bond+, 2006)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
J/PASJ/57/109 : Late-G giants abundances (Takeda+, 2005)
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
http://exoplanet.eu/ : The Extrasolar Planets Encyclopaedia home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_Star [P ] P: planet-host star
3- 11 A9 --- Star Star name
13- 23 A11 "YYYY/MMM/DD" Date Observation date
25- 28 I4 s Exp Exposure time
30- 32 I3 --- S/N Signal to noise ratio at 6070Å
34- 38 F5.1 km/s RV Radial velocity (1)
40- 42 F3.1 km/s e_RV RV uncertainty
44- 47 I4 K Teff Effective temperature
49- 51 I3 K e_Teff Teff uncertainty
53- 56 F4.2 [cm/s2] logg Log of surface gravity
58- 61 F4.2 [cm/s2] e_logg logg uncertainty
63- 67 F5.2 [-] [Fe/H] Abundance [Fe/H]
69- 72 F4.2 [-] e_[Fe/H] Error on [Fe/H]
74- 77 F4.2 km/s Vt Microturbulence velocity
79- 82 F4.2 km/s e_Vt Vt uncertainty
84- 91 A8 --- SpT SIMBAD MK spectral type
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Note (1): Radial velocities that were obtained from center wavelengths via the
measurements of equivalent widths.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ion Ion identification
7- 13 F7.2 0.1nm lambda Line wavelength (Å)
15- 18 F4.2 eV ExPot Excitation potential
20- 24 F5.2 [-] log(gf) Log of the oscillator strength
26- 30 F5.1 0.1pm EW Equivalent width of the Sun (mÅ)
32- 35 F4.2 [-] log(eps) Log abundance of the ion (ε(H)=12)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Dec-2012