J/ApJ/757/161 Spectroscopy of 56 exoplanet host stars (Torres+, 2012)
Improved spectroscopic parameters for transiting planet hosts.
Torres G., Fischer D.A., Sozzetti A., Buchhave L.A., Winn J.N.,
Holman M.J., Carter J.A.
<Astrophys. J., 757, 161 (2012)>
=2012ApJ...757..161T 2012ApJ...757..161T
ADC_Keywords: Abundances, [Fe/H] ; Effective temperatures ; Spectroscopy
Rotational velocities ; Stars, double and multiple
Keywords: planetary systems; stars: abundances; stars: fundamental parameters;
techniques: spectroscopic
Abstract:
We report homogeneous spectroscopic determinations of the effective
temperature, metallicity, and projected rotational velocity for the
host stars of 56 transiting planets. Our analysis is based primarily
on the stellar parameter classification (SPC) technique. We
investigate systematic errors by examining subsets of the data with
two other methods that have often been used in previous studies
(Spectroscopy Made Easy (SME) and MOOG). The SPC and SME results, both
based on comparisons between synthetic spectra and actual spectra,
show strong correlations between Teff, [Fe/H], and log g when
solving for all three quantities simultaneously. In contrast the MOOG
results, based on a more traditional curve-of-growth approach, show no
such correlations. To combat the correlations and improve the accuracy
of the temperatures and metallicities, we repeat the SPC analysis with
a constraint on log g based on the mean stellar density that can be
derived from the analysis of the transit light curves. Previous
studies that have not taken advantage of this constraint have been
subject to systematic errors in the stellar masses and radii of up to
20% and 10%, respectively, which can be larger than other
observational uncertainties, and which also cause systematic errors in
the planetary mass and radius.
Description:
For this work, we have relied in part on new spectra collected with
the TRES instrument (for 22 stars, λ∼3860-9100Å, R∼48000) on
the 1.5m Tillinghast reflector at the F. L. Whipple Observatory (Mount
Hopkins, AZ), and also on publicly available spectra obtained with the
HIRES instrument on the Keck I telescope (Mauna Kea, HI; R∼68000 or
51000) and with the FIES instrument on the 2.5m Nordic Optical
Telescope (La Palma, Spain; R∼46000).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 89 92 Spectroscopic results using the external constraint
of log(g) from photometry (constrained analysis)
table7.dat 55 56 Final spectroscopic results (average of all new
determinations)
refs.dat 71 46 References
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See also:
J/MNRAS/428/3164 : Spectroscopy of WASP planet host stars (Doyle+, 2013)
J/A+A/556/A150 : SWEETCat I. Stellar parameters for host stars (Santos+, 2013)
J/ApJ/749/134 : HAT-P-17 radial velocities and light curves (Howard+, 2012)
J/ApJ/745/80 : HAT-P-25 differential photometry (Quinn+, 2012)
J/A+A/531/A60 : WASP-31b photometry and radial velocities (Anderson+, 2011)
J/A+A/525/A54 : Transits of WASP-38b (Barros+, 2011)
J/ApJ/742/116 : Phot. of four massive transiting exoplanets (Bakos+, 2011)
J/ApJ/733/116 : HAT-P-28 and HAT-P-29 photometry (Buchhave+, 2011)
J/ApJ/728/138 : Follow-up photometry of HAT-P-26 (Hartman+, 2011)
J/ApJ/726/52 : HAT-P-18 and HAT-P-19 follow-up (Hartman+, 2011)
J/ApJ/725/2017 : Sloan i-band light curve of HAT-P-24 (Kipping+, 2010)
J/A+A/516/A95 : Photometry and spectroscopy of HD 80606b (Hebrard+, 2010)
J/A+A/511/A3 : Light curves of CoRoT-2 in z-band, 4.5um & 8um (Gillon+, 2010)
J/ApJ/724/866 : Follow-up observations of HAT-P-15 (Kovacs+, 2010)
J/ApJ/715/458 : Differential photometry of HAT-P-14 (Torres+, 2010)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
J/MNRAS/403/1368 : Abundances + vsini for star-planet systems (Gonzalez+, 2010)
J/ApJ/707/446 : HAT-P-13 photometry follow-up (Bakos+, 2009)
J/ApJ/704/1107 : Transiting planet cand. in HATNet field 205 (Latham+, 2009)
J/ApJ/692/L9 : Tansiting extrasolar planets tidal evolution (Levrard+, 2009)
J/ApJ/691/1145 : Spectrophotometry of TrES-3 and TrES-4 (Sozzetti+, 2009)
J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)
J/AJ/137/4911 : Six transits of the exoplanet XO-2b (Fernandez+, 2009)
J/ApJ/683/1076 : Transits of exoplanet XO-3b (Winn+, 2008)
J/AJ/133/1828 : Transit light curves of HD 189733 (Winn+, 2007)
J/A+A/458/997 : Abundances for 6 transiting planet host stars (Santos+, 2006)
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)
http://www.as.utexas.edu/~chris/moog.html : MOOG home page
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
11- 14 I4 K Teff1 [4629/6827] Effective temperature with SPC (2)
16- 18 I3 K e_Teff1 Uncertainty in Teff1
20- 24 F5.2 [Sun] [Fe/H]1 [-0.3/0.5] Metallicity with SPC (2)
26- 29 F4.2 [Sun] e_[Fe/H]1 Uncertainty in [Fe/H]1
31- 34 F4.1 km/s vsini1 [0/25] SPC Projected rotational velocity (2)
36- 38 F3.1 km/s e_vsini1 Uncertainty in vsini1
40- 43 I4 K Teff2 [4780/6690]? Effective temperature with SME (2)
45- 47 I3 K e_Teff2 ? Uncertainty in Teff2
49- 53 F5.2 [Sun] [Fe/H]2 [-0.2/0.5]? Metallicity with SME (2)
55- 58 F4.2 [Sun] e_[Fe/H]2 ? Uncertainty in [Fe/H]2
60- 63 F4.1 km/s vsini2 [0/19]? SME projected rotational velocity (2)
65- 67 F3.1 km/s e_vsini2 ? Uncertainty in vsini2
69- 72 I4 K Teff3 [4600/6550]? Effective temperature with MOOG (2)
74- 76 I3 K e_Teff3 ? Uncertainty in Teff3
78- 82 F5.2 [Sun] [Fe/H]3 [-0.4/0.3]? Metallicity with MOOG (2)
84- 87 F4.2 [Sun] e_[Fe/H]3 ? Uncertainty in [Fe/H]3
89 A1 --- Tel Telescope code (1)
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Note (1): Telescope as follows:
H = Keck/HIRES (High Resolution Echelle Spectrometer)
F = NOT/FIES (Nordic Optical Telescope, La Palma;
high-resolution FIbre-fed Echelle Spectrograph)
T = FLWO/TRES (Fred Lawrence Whipple Observatory, AZ;
Tillinghast Reflector Echelle Spectrograph)
Note (2): Analysis methods are:
SPC = Stellar Parameter Classification, introduced by Buchhave et al.
(2012Natur.486..375B 2012Natur.486..375B)
SME = Spectroscopy Made Easy, introduced by Valenti & Piskunov
(1996A&AS..118..595V 1996A&AS..118..595V)
MOOG = code of LTE line analysis, introduced by Sneden (PhD Thesis 1973,
Univ. Austin, Texas) see http://www.as.utexas.edu/~chris/moog.html
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
11- 14 I4 K Teff [4619/6759]? Effective temperature
16- 18 I3 K e_Teff Uncertainty in Teff
20- 24 F5.2 [Sun] [Fe/H] [-0.3/0.5] Metallicity
26- 29 F4.2 [Sun] e_[Fe/H] Uncertainty in [Fe/H]
31- 34 F4.1 km/s vsini [0.5/23] Projected rotational velocity
36- 38 F3.1 km/s e_vsini Uncertainty in vsini
40 I1 --- N1 Number of Teff and Fe/H determinations (1)
41 A1 --- --- [,]
42 I1 --- Nv Number of vsini determinations
44- 47 F4.2 [cm/s2] log(g) [4/4.7] Log of the external surface gravity
49- 52 F4.2 [cm/s2] e_log(g) Uncertainty in log(g)
54- 55 I2 --- r_log(g) Source code (2)
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Note (1): Number of determinations for Teff and [Fe/H] (based on spectra from
different telescopes, or derived with different methodologies).
Note (2): Sources for the external logg constraint (either reported directly in
these studies, or inferred from M* and R* as reported there, or
based on the reported a/R* values and our own stellar evolution
modeling using isochrones from Yi et al. 2001ApJS..136..417Y 2001ApJS..136..417Y).
See refs.dat file.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode
24- 51 A28 --- Aut Author's name(s)
53- 71 A19 --- Cat VizieR catalog reference
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Jun-2014