J/A+A/511/A55 Radial velocities with CRIRES (Figueira+, 2010)
Radial velocities with CRIRES: Pushing precision down to 5-10 m/s.
Figueira P., Pepe F., Melo C.H.F., Santos N.C., Lovis C., Mayor M.,
Queloz D., Smette A., Udry S.
<Astron. Astrophys. 511, A55 (2010)>
=2010A&A...511A..55F 2010A&A...511A..55F
ADC_Keywords: Stars, pre-main sequence ; Radial velocities
Keywords: stars: planetary systems - infrared: stars -
instrumentation: spectrographs - methods: observational -
techniques: radial velocities
Abstract:
With the advent of high-resolution infrared spectrographs, radial
velocity (RV) searches enter into a new domain. As of today, the most
important technical question to address is which wavelength reference
is the most suitable for high-precision RV measurements. In this work
we use atmospheric absorption features as wavelength reference on
CRIRES data obtained on two programs and three different targets. We
analyzed the data from the TW Hya campaign again, reaching a
dispersion of about 6m/s on the RV standard on a time scale of
roughly 1 week. We confirm that there is a low-amplitude RV signal on
TW Hya itself, with an amplitude roughly 3 times smaller than the one
reported at visible wavelengths. We present RV measurements of Gl 86
as well, showing that our approach is capable of detecting the signal
induced by a planet and correctly quantifying it. Our data show that
CRIRES is capable of reaching an RV precision of less than 10m/s on a
time scale of one week. The limitations of this particular approach
are discussed, along with the limiting factors on RV precision in the
IR in a general way. The implications of this work on the design of
future dedicated IR spectrographs are addressed as well.
Description:
The tables contain the CRIRES radial velocity data for the three stars
in the paper. Table 2 contains the data on the RV standard and on
TW Hya. Table 3 contains the data on Gl 86.
Objects:
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RA (2000) DE Designation(s)
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11 01 51.9 -34 42 17 TW Hya = HIP 53911
02 10 25.9 -50 49 25 Gl 86 = HD 13445
12 26 48.1 -48 54 47 RV std = HD 108309
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 20 Radial velocity of RV std (HD108309) and TW Hya
table3.dat 27 24 Radial velocity of Gl86
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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- 14 F14.6 d BJ1 Barycentric Julian date : RV std (HD108309)
16- 22 F7.4 km/s RV1 Barycentric radial velocity : RV std (HD108309)
24- 27 F4.1 m/s noise1 Photon noise uncertainty : RV std (HD108309)
29- 42 F14.6 d BJ2 Barycentric Julian date : TW Hya
44- 50 F7.4 km/s RV2 Barycentric radial velocity : TW Hya
52- 55 F4.1 m/s noise2 Photon noise uncertainty : TW Hya
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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- 14 F14.6 d BJ3 Barycentric Julian date: Gl 86
16- 22 F7.4 km/s RV3 Barycentric radial velocity : Gl 86
24- 27 F4.1 m/s noise3 Photon noise uncertainty: Gl 86
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Acknowledgements:
Pedro Figueira, Pedro.Figueira(at)unige.ch
(End) Patricia Vannier [CDS] 07-Jan-2010