J/A+A/576/A134 Radial velocities of 51 Peg (Martins+, 2015)
Evidence for a spectroscopic direct detection of reflected light from 51 Peg b.
Martins J.H.C., Santos N.C., Figueira P., Faria J.P., Montalto M.,
Boisse I., Ehrenreich D., Lovis C., Mayor M., Melo C., Pepe F., Sousa S.,
Udry S., Cunha D.
<Astron. Astrophys. 576, A134 (2015)>
=2015A&A...576A.134M 2015A&A...576A.134M
ADC_Keywords: Stars, double and multiple ; Radial velocities
Keywords: planetary systems - planets and satellites: detection -
techniques: spectroscopy - techniques: radial velocities
Abstract:
The detection of reflected light from an exoplanet is a difficult
technical challenge at optical wavelengths. Even though this signal is
expected to replicate the stellar signal, not only is it several
orders of magnitude fainter, but it is also hidden among the stellar
noise.
We apply a variant of the cross-correlation technique to HARPS
observations of 51 Peg to detect the reflected signal from planet
51 Peg b.
Our method makes use of the cross-correlation function (CCF) of a
binary mask with high-resolution spectra to amplify the minute
planetary signal that is present in the spectra by a factor
proportional to the number of spectral lines when performing the cross
correlation. The resulting cross-correlation functions are then
normalized by a stellar template to remove the stellar signal.
Carefully selected sections of the resulting normalized CCFs are
stacked to increase the planetary signal further. The recovered signal
allows probing several of the planetary properties, including its real
mass and albedo.
Description:
The table contains the radial velocity data for HARPS observations of
51 Peg. This data was collected with the HARPS spectrograph at ESO's
3.6-m Telescope at La Silla-Paranal Observatory, as part of ESO
programme 091.C-0271. It consists of 91 spectra observed in seven
different nights (2013-06-08, 2013-06-25, 2013-08-02, 2013-08-04,
2013-09-05, 2013-09-09 and 2013-09-30) totalling around 12.5h of
observing time. The obtained spectra have a S/N on the 50th order
(∼5560Å) that varies between 122 and 388. The spectra cover the
wavelengths range from roughly 3781Å to 6910Å.
Objects:
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RA (2000) DE Designation(s)
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22 57 27.98 +20 46 07.8 51 Peg = HR 8729
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
51pegrv.dat 30 90 List of radial velocities for the observations of
star 51 Peg collected under ESO program 091.C-0271
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Byte-by-byte Description of file: 51pegrv.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d JD [56451/56566] Julian Date (JD-2400000)
14- 22 F9.5 km/s RV [-32.2/-33.1] Radial velocity
24- 30 F7.5 km/s e_RV [0.00051/0.00084] rms uncertainty on RV
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Acknowledgements:
Jorge Martins, jmartins(at)eso.org
(End) Patricia Vannier [CDS] 06-Apr-2015