J/ApJ/720/1592 Abundances of solar analogs with planets (Hernandez+, 2010)
Searching for the signatures of terrestrial planets in solar analogs.
Hernandez J.I.G., Israelian G., Santos N.C., Sousa S., Delgado-Mena E.,
Neves V., Udry S.
<Astrophys. J., 720, 1592-1602 (2010)>
=2010ApJ...720.1592H 2010ApJ...720.1592H
ADC_Keywords: Abundances ; Planets ; Stars, G-type ; Stars, double and multiple
Keywords: planetary systems - stars: abundances - stars: atmospheres -
stars: formation - stars: fundamental parameters
Abstract:
We present a fully differential chemical abundance analysis using very
high resolution (λ/δλ≳85000) and very high
signal-to-noise (S/N∼800 on average) HARPS and UVES spectra of 7 solar
twins and 95 solar analogs, of which 24 are planet hosts and 71 are
stars without detected planets. The whole sample of solar analogs
provides very accurate Galactic chemical evolution trends in the
metallicity range -0.3<[Fe/H]<0.5. Solar twins with and without
planets show similar mean abundance ratios. We have also analyzed a
sub-sample of 28 solar analogs, 14 planet hosts, and 14 stars without
known planets, with spectra at S/N∼850 on average, in the metallicity
range 0.14<[Fe/H]<0.36, and find the same abundance pattern for both
samples of stars with and without planets. This result does not depend
on either the planet mass, from 7 Earth masses to 17.4 Jupiter masses,
or the orbital period of the planets, from 3 to 4300 days. In
addition, we have derived the slope of the abundance ratios as a
function of the condensation temperature for each star and again find
similar distributions of the slopes for both stars with and without
planets. In particular, the peaks of these two distributions are
placed at a similar value but with the opposite sign to that expected
from a possible signature of terrestrial planets. In particular, two
of the planetary systems in this sample, each of them containing a
super-Earth-like planet, show slope values very close to these peaks,
which may suggest that these abundance patterns are not related to the
presence of terrestrial planets.
Description:
High-resolution spectroscopic data have been obtained with three
different telescopes and instruments: the 3.6m telescope equipped
with HARPS at the Observatorio de La Silla in Chile, the 8.2m Kueyen
VLT (UT2) telescope equipped with UVES at the Observatorio Cerro
Paranal in Chile, and the 4.2m WHT telescope equipped with UES at the
Observatorio del Roque de los Muchachos in La Palma, Spain.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 30 95 Star sample (solar analogs)
table4.dat 27 2280 Abundance ratios [X/Fe] of solar analogs with
and without known planets
--------------------------------------------------------------------------------
See also:
J/A+A/541/A40 : Metallicity of solar-type stars (Maldonado+, 2012)
J/ApJ/715/1050 : Predicted abundances for extrasolar planets. I. (Bond+, 2010)
J/ApJ/720/1290 : Abundances of stars hosting planets (Ghezzi+, 2010)
J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)
J/MNRAS/370/163 : Abundance distribution of stars with planets (Bond+, 2006)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number
8- 9 I2 h RAh SIMBAD hour of right ascension (J2000)
11- 12 I2 min RAm SIMBAD minute of right ascension (J2000)
14- 18 F5.2 s RAs SIMBAD second of right ascension (J2000)
20 A1 --- DE- SIMBAD sign of declination (J2000)
21- 22 I2 deg DEd SIMBAD degree of declination (J2000)
24- 25 I2 arcmin DEm SIMBAD arcminute of declination (J2000)
27- 30 F4.1 arcsec DEs SIMBAD arcsecond of declination (J2000)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number
8 A1 --- --- [[]
9- 10 A2 --- X Element identification
11- 14 A4 --- --- []/Fe]
16- 21 F6.3 [-] [X/Fe] ? The [X/Fe] number abundance ratio (1)
23- 27 F5.3 [-] e_[X/Fe] ? Uncertainty in [X/Fe] (2)
--------------------------------------------------------------------------------
Note (1): For stars whose spectral line or lines of a given element, X, could
not be accurately measured, no value of the abundance ratio, [X/Fe],
is provided.
Note (2): The uncertainty on the element abundance ratio only includes the
dispersion of the measurements from different spectral lines. We
adopt an uncertainty of 0.07 dex when only one spectral line was
available.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 03-Jul-2012