J/A+A/593/A5 Radial velocity fitting challenge dataset (Dumusque, 2016)
The radial velocity fitting challenge.
I. Simulating the data set including realistic stellar radial-velocity signals.
Dumusque X.,
<Astron. Astrophys. 593, A5 (2016)>
=2016A&A...593A...5D 2016A&A...593A...5D (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Stars, double and multiple ; Planets ; Radial velocities
Keywords: techniques: radial velocities - stars: oscillations -
stars: activity - Sun: activity - Sun: faculae, plages - sunspots
Abstract:
Stellar signals are the main limitation for precise radial-velocity
(RV) measurements. These signals arise from the photosphere of the
stars. The m/s perturbation created by these signals prevents the
detection and mass characterization of small-mass planetary candidates
such as Earth-twins. Several methods have been proposed to mitigate
stellar signals in RV measurements. However, without precisely knowing
the stellar and planetary signals in real observations, it is
extremely difficult to test the efficiency of these methods. The goal
of the RV fitting challenge is to generate simulated RV data including
stellar and planetary signals and to perform a blind test within the
community to test the efficiency of the different methods proposed to
recover planetary signals despite stellar signals. In this first
paper, we describe the simulation used to model the measurements of
the RV fitting challenge. Each simulated planetary system includes the
signals from instrumental noise, stellar oscillations, granulation,
supergranulation, stellar activity, and observed and simulated
planetary systems. In addition to RV variations, this simulation also
models the effects of instrumental noise and stellar signals on
activity observables obtained by HARPS-type high-resolution
spectrographs, that is, the calcium activity index log(R'HK),and the
bisector span and full width at half maximum of the cross-correlation
function. We publish the 15 systems used for the RV fitting challenge
including the details about the planetary systems that were injected
into each of them.
Description:
Data set of the radial velocity challenge. In total 15 planetary
systems are present in this data set. System 6 has been removed from
the data for reasons explained in paper. Systems 1, 2, 3, 4, 5, 7, 8,
12, 13 and 15 are simulated datasets, using our model of stellar
signals described in the paper. Systems 9, 10, 11 and 14 are real
HARPS measurements, into which fake planetary signals have been added
for the purpose of the challenge. For each system, two version of the
data exist, one with only the minimum information that were given to
the different teams to perform the data analysis, and one which
describes all the signals that have been injected: different stellar
signals and planetary signals.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sys1.dat 188 492 Data with minimum info, used for the blind test
sys2.dat 188 492 Data with minimum info, used for the blind test
sys3.dat 188 492 Data with minimum info, used for the blind test
sys4.dat 188 492 Data with minimum info, used for the blind test
sys5.dat 188 527 Data with minimum info, used for the blind test
sys7.dat 188 527 Data with minimum info, used for the blind test
sys8.dat 188 527 Data with minimum info, used for the blind test
sys9.dat 188 433 Data with minimum info, used for the blind test
sys10.dat 188 433 Data with minimum info, used for the blind test
sys11.dat 188 433 Data with minimum info, used for the blind test
sys12.dat 188 433 Data with minimum info, used for the blind test
sys13.dat 188 433 Data with minimum info, used for the blind test
sys14.dat 188 170 Data with minimum info, used for the blind test
sys15.dat 188 170 Data with minimum info, used for the blind test
sys9all.dat 188 433 *Data with all the info about planets and
stellar signal
sys10all.dat 188 433 *Data with all the info about planets and
stellar signal
sys11all.dat 188 433 *Data with all the info about planets and
stellar signal
sys14all.dat 188 170 *Data with all the info about planets and
stellar signal
sys1all.dat 345 492 Data with all the info about planets and
stellar signal
sys2all.dat 345 492 Data with all the info about planets and
stellar signal
sys3all.dat 345 492 Data with all the info about planets and
stellar signal
sys4all.dat 345 492 Data with all the info about planets and
stellar signal
sys5all.dat 345 527 Data with all the info about planets and
stellar signal
sys7all.dat 345 527 Data with all the info about planets and
stellar signal
sys8all.dat 345 527 Data with all the info about planets and
stellar signal
sys12all.dat 345 433 Data with all the info about planets and
stellar signal
sys13all.dat 345 433 Data with all the info about planets and
stellar signal
sys15all.dat 345 170 Data with all the info about planets and
stellar signal
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Note on sys9all.dat sys10all.dat sys11all.dat sys14all.dat:
Systems 9, 10, 11 and 14 are real HARPS measurements, into which fake planetary
signals have been added for the purpose of the challenge.
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Byte-by-byte Description of file (#): sys?.dat sys1?.dat *9a*.dat *1[014]a*.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian Date (BJD-2400000)
17- 25 F9.6 km/s RV Radial velocity
33- 40 F8.6 km/s e_RV Uncertainty on radial velocity
(photon + instrument)
49- 57 F9.6 km/s FWHM FWHM span of the CCF
65- 72 F8.6 km/s Contrast [0] Contrast span of the CCF
81- 89 F9.6 km/s BisSpan Bisector span of the CCF
97-104 F8.6 km/s noise Uncertainty on radial velocity
(only photon noise)
113-120 F8.6 --- SMW [0] Calcium index S Mount Wilson
129-136 F8.6 --- e_SMW [0] Uncertainty on S Mount Wilson
145-151 F7.4 --- logRHK Calcium index log(R'HK)
153-158 F6.4 --- e_logRHK Uncertainty on log(R'HK)
161-164 F4.2 --- snCaII Signal to noise in the order of the
calcium index
169-172 F4.2 --- sn10 Signal to noise in order 10
177-180 F4.2 --- sn50 Signal to noise in order 50
185-188 F4.2 --- sn60 Signal to noise in order 60
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Byte-by-byte Description of file (#): sys[12345678]all.dat sys1[235]all.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian Date (BJD-2400000)
17- 25 F9.6 km/s RV Radial velocity (RV)
33- 40 F8.6 km/s e_RV Uncertainty on RV (photon + inst.)
50- 58 F9.6 km/s FWHM FWHM span of the CCF
65- 72 F8.6 km/s e_FWHM Uncertainty on FWHM
82- 90 F9.6 km/s BisSpan Bisector span of the CCF
97-104 F8.6 km/s e_BisSpan Uncertainty on Bisector span
113-121 F9.6 --- logRHK Calcium index log(R'HK)
129-136 F8.6 --- e_logRHK Uncertainty on log(R'HK)
145-153 F9.6 km/s RVo+g Radial velocity oscillation + granulation
(rvoscand_gran)
161-168 F8.6 km/s RVact Radial velocity activity (rv_activity)
177-186 F10.6 km/s RVplan Radial velocity Planet (rv_planet)
193-201 F9.6 km/s RVInstn Radial velocity instrument noise
(rvinstnoise)
209-217 F9.6 km/s FWHMo+g FWHM oscillation + granulation
(fwhmoscand_gran)
225-232 F8.6 km/s FWHMact FWHM activity (fwhm_activity)
243-251 F9.6 km/s FWHMInstn FWHM instrument noise (fwhminstnoise)
257-265 F9.6 km/s BisSpano+g Bisector span oscillation + granulation
(bisspanoscandgran)
274-282 F9.6 km/s BisSpanact Bisector span activity (bisspanactivity)
289-297 F9.6 km/s BisSpanInstn Bisector span instrument noise
(bisspaninst_noise)
305-313 F9.6 --- logRHKo+g log(R'HK) oscillation + granulation
(rhkoscand_gran)
322-330 F9.6 --- logRHKact log(R'HK) activity (rhk_activity)
337-345 F9.6 --- logRHKInstn log(R'HK) instrument noise (rhkinstnoise)
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Acknowledgements:
Xavier Dumusque, x.dumusque(at)gmail.com
(End) X. Dumusque [Obs. Geneva, Switzerland], P. Vannier [CDS] 22-Jul-2016