J/A+A/534/A58 HD20794, HD85512, HD192310 HARPS radial velocities (Pepe+, 2011)
The HARPS search for Earth-like planets in the habitable zone.
I. Very low-mass planets around HD 20794, HD 85512 and HD 192310.
Pepe F., Lovis C., Segransan D., Benz W., Bouchy F., Dumusque X., Mayor M.,
Queloz D., Santos N.C., Udry S.
<Astron. Astrophys. 534, A58 (2011)>
=2011A&A...534A..58P 2011A&A...534A..58P
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: planetary systems - instrumentation: spectrographs -
techniques: radial velocities - stars: individual: HD 20794 -
stars: individual: HD 85512 - stars: individual: HD 192310
Abstract:
In 2009 we started, within the dedicated HARPS-Upgrade GTO program, an
intense radial-velocity monitoring of a few nearby, slowly-rotating
and quiet solar-type stars. The goal of this campaign is to gather,
with high cadence and continuity, very-precise radial-velocity data in
order to detect tiny signatures of very-low-mass stars potentially in
the habitable zone of their parent stars. 10 stars have been selected
among the most stable stars of the original HARPS high-precision
program, uniformly spread in hour angle, such that three to four of
them are observable at any time of the year. For each star we record
50 data points spread over the observing season. The data point
consists of three nightly observations of a total integration time of
10 minutes each and separated by 2 hours. This is an observational
strategy adopted to minimize stellar pulsation and granulation noise.
In this paper we present the first results of this ambitious program.
The radial-velocity data and the orbital parameters of five new and
one confirmed low-mass planets around the stars HD 20794, HD 85512 and
HD 192310, respectively, are reported and discussed, among which a
system of three super-Earths and one harboring a 3.6-Earth-mass planet
at the inner edge of the habitable zone. This result already confirms
previous indications that low-mass planets seem to be very frequent
around solar-type stars and that this occurrence frequency may be
higher than 30%.
Description:
HARPS radial velocities, CCF FWHM, bisector span and log(R'HK)
measurements for HD 20794, HD 85512 and HD 192310 and corresponding
internal errors are provided in three separate tables. The radial
velocities are corrected from the Earth barycentric motion and are
given as nightly averages of several shorter measurements. Radial
velocities, line width (FWHM) and line bisector are all computed on
the cross-correlation function (CCF), which represents a sort of
average spectral line. The log(R'HK) values are provided by the online
HARPS data pipeline.
Objects:
----------------------------------------------------------------------
RA (2000) DE Designation(s) (files)
----------------------------------------------------------------------
03 19 55.7 -43 04 11 HD 20794 = HIP 15510 = GJ 139 (table1.dat)
09 51 07.1 -43 30 10 HD 85512 = HIP 48331 = GJ 370 (table2.dat)
20 15 17.4 -27 01 58 HD 192310 = HIP 99825 = GJ 785 (table3.dat)
----------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 80 187 HD 20794 HARPS data
table2.dat 80 185 HD 85512 HARPS data
table3.dat 80 142 HD 192310 HARPS data
--------------------------------------------------------------------------------
See also:
J/A+A/474/293 : Radial velocities of GJ 674 (Bonfils+, 2007)
J/A+A/469/L43 : Radial velocities of Gl 581 (Udry+, 2007)
J/A+A/496/513 : RV of 6 stars with long-period giant planets (Moutou+, 2009)
J/A+A/496/521 : Radial velocities of HD 45364 (Correia+, 2009)
J/A+A/496/527 : Radial velocity of HD 47186 and HD 181433 (Bouchy+, 2009)
J/A+A/507/487 : GJ 581 radial velocity curve (Mayor+, 2009)
J/A+A/512/A46 : Radial velocities of BD-08 2823 (Hebrard+, 2010)
J/A+A/512/A47 : Radial velocities of 3 stars with giant planets (Santos+ 2010)
J/A+A/512/A48 : HD125612, HD215497, HIP5158 HARPS RV curves (Lo Curto+, 2010)
J/A+A/523/A15 : RV data for the 8 targets (Naef+, 2010)
J/A+A/526/A111 : HD 85390, 90156 and 103197 radial velocity (Mordasini+, 2011)
J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+ 2011)
J/A+A/526/A141 : HIP 85647 & Gl 676A radial velocities (Forveille+, 2011)
J/A+A/527/L11 : HAT-P-6 radial velocity curve (Hebrard+, 2011)
J/A+A/527/A63 : 7 new HARPS planetary systems radial velocities (Moutou+ 2011)
J/A+A/528/A111 : GJ3634 radial velocity and 4.5um flux (Bonfils+, 2011)
J/A+A/528/A112 : Radial velocities of HD 10180 (Lovis+, 2011)
J/A+A/531/A24 : WASP-23 photometric and radial velocity data (Triaud+, 2011)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d BJD Barycentric Julian Date
16- 24 F9.5 km/s RV Radial velocity
26- 32 F7.5 km/s e_RV rms uncertainty on radial velocity
34- 40 F7.5 km/s FWHM Cross-correlation function (CCF) FWHM
42- 48 F7.5 km/s e_FWHM rms uncertainty on CCF FWHM
50- 57 F8.5 km/s Span Bisector span of the cross-correlation function
59- 65 F7.5 km/s e_Span rms uncertainty on bisector span
67- 73 F7.4 [-] logR'(HK) Activity index logR'(HK)
75- 80 F6.4 [-] e_logR'(HK) rms uncertainty on logR'(HK)
--------------------------------------------------------------------------------
Acknowledgements:
Christophe Lovis, christophe.lovis(at)unige.ch
Francesco Pepe, Francesco.Pepe(at)unige.ch
(End) Patricia Vannier [CDS] 25-Aug-2011