J/ApJ/697/544 Planets orbiting metal-poor dwarfs. II. (Sozzetti+, 2009)
A Keck HIRES Doppler search for planets orbiting metal-poor dwarfs.
II. On the frequency of giant planets in the metal-poor regime.
Sozzetti A., Torres G., Latham D.W., Stefanik R.P., Korzennik S.G.,
Boss A.P., Carney B.W., Laird J.B.
<Astrophys. J., 697, 544-556 (2009)>
=2009ApJ...697..544S 2009ApJ...697..544S
ADC_Keywords: Stars, metal-deficient ; Radial velocities ; Abundances, [Fe/H] ;
Spectroscopy ; Planets
Keywords: planetary systems: formation - stars: abundances - stars: statistics -
techniques: radial velocities
Abstract:
We present an analysis of three years of precision radial velocity
(RV) measurements of 160 metal-poor stars observed with HIRES on the
Keck 1 telescope. We report on variability and long-term velocity
trends for each star in our sample. We identify several long-term,
low-amplitude RV variables worthy of followup with direct imaging
techniques. We place lower limits on the detectable companion mass as
a function of orbital period. Our survey would have detected, with a
99.5% confidence level, over 95% of all companions on low-eccentricity
orbits with velocity semiamplitude K≳100m/s, or
Mpsini≳3.0MJ(P/yr)(1/3), for orbital periods P≲3yr. None of
the stars in our sample exhibits RV variations compatible with the
presence of Jovian planets with periods shorter than the survey
duration.
Description:
Table 1 lists 160 metal-deficient stars observed at least twice during
our three-year long observing campaign with HIRES on the Keck 1
telescope in 2003-2005. About 10% of the targets in Table 1 are also
in the list of southern metal-poor stars observed with HARPS (Mayor
et al. 2003Msngr.114...20M 2003Msngr.114...20M).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 91 160 Target list of the Keck HIRES metal-poor planet
survey
table2.dat 31 160 Radial-velocity results for all stars
table3.dat 57 160 Variability analysis for the sample
table4.dat 72 153 Test for long-term trends
table5.dat 36 766 Radial velocity measurements for stars with
σrms/σint≲3.0
table6.dat 36 52 Radial velocity measurements for stars with
linear trends
table7.dat 36 21 Radial velocity measurements for stars with
non-linear trends
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See also:
J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)
J/A+A/527/A63 : Radial velocities of 7 new HARPS planetary systems (Moutou+,
2011)
J/A+A/523/A15 : HARPS XXIII: RV data for the 8 targets (Naef+, 2010)
J/A+A/524/A25 : Radial Velocities on 6 exoplanet host stars (Triaud+, 2010)
J/A+A/512/A47 : Radial velocities of 3 stars with giant planets (Santos+,
2010)
J/A+A/496/513 : RV of 6 stars with long-period giant planets (Moutou+, 2009)
J/ApJ/652/1585 : Bright metal-poor stars from HES survey (Frebel+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star Name
12- 21 A10 --- AName Alternative name; HD/HIP
23- 24 I2 h RAh Hour of Right Ascension (J2000)
26- 27 I2 min RAm Minute of Right Ascension (J2000)
29- 33 F5.2 s RAs Second of Right Ascension (J2000)
35 A1 --- DE- Sign of the Declination (J2000)
36- 37 I2 deg DEd Degree of Declination (J2000)
39- 40 I2 arcmin DEm Arcminute of Declination (J2000)
42- 45 F4.1 arcsec DEs Arcsecond of Declination (J2000)
47- 51 F5.2 mag Vmag The visual magnitude
53- 56 I4 K Teff Effective temperature
58- 62 F5.2 [Sun] [Fe/H] Metallicity
64- 67 F4.2 Msun Mass Mass of star
69- 72 F4.2 mag B-V The (B-V) color index
74- 77 F4.2 mag V-K The (V-K) color index
79- 82 F4.2 [cm/s2] log(g) Log of the surface gravity
84- 86 I3 pc Dph ? Photometric distance estimate
88- 91 I4 pc Dhip ? Hipparcos parallax distance
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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- 10 A10 --- Name Star name (1)
12- 13 I2 --- N Total number of spectra collected
15- 19 F5.1 m/s sig-rms Total radial velocity scatter
21- 24 F4.1 m/s sig-int Average internal measurement error
26- 31 F6.1 d DelT Time-span of the observations
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Note (1): Radial-velocity results for all stars observed at least twice
during the survey.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 13 I2 --- N Total number of spectra collected
15- 20 F6.3 --- Ratio Ratio of σrms to σint
22- 33 E12.6 --- P(chi2) χ2-test probability (2)
35- 45 E11.5 --- P(Ku) ? Kuper's Ku-test probability (2)
47- 57 E11.5 --- P(F) F-test probability (2)
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Note (2): false alarm probability of velocity variation: a probability
less than 0.005 means the velocity is variable
(at a 99.5% confidence level)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 13 I2 --- N Total number of spectra collected
15- 19 F5.2 --- Ratio Ratio of (σrms to
σint)_constant
21- 27 F7.2 m/s/yr Slope Slope
29- 34 F6.2 m/s/yr e_Slope Uncertainty in Slope
36- 41 F6.1 --- F-test F-test
43- 53 E11.5 --- P(F) F-test probability of non-significant slope
55- 60 F6.3 --- Lin Ratio of (σrms to σint)_linear
62- 72 E11.5 --- P(chi2) The χ2-test probability on post-fit
residuals (slope taken into account)
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Byte-by-byte Description of file: table[567].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star identification
12- 24 F13.5 d BJD Baricentric Julian Date
26- 31 F6.1 m/s HRV Heliocentric radial velocity
33- 36 F4.1 m/s e_HRV The 1σ uncertainty in HRV
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History:
* 30-May-2011: From electronic version of the journal
* 10-Jul-2011: in tables 4-7, the following Names have been
corrected to match the star names in tables 1-3:
G 142-2 corrected into G 142-21
G 169-5 corrected into G 169-45
References:
Sozzetti et al. Paper I. 2006ApJ...649..428S 2006ApJ...649..428S
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 30-May-2011