J/A+A/585/A134 HD1461, HD40307, and HD204313 radial velocities (Diaz+, 2016)
The HARPS search for southern extra-solar planets.
XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed
signals, and magnetic cycles.
Diaz R.F., Segransan D., Udry S., Lovis C., Pepe F., Dumusque X.,
Marmier M., Alonso R., Benz W., Bouchy F., Coffinet A., Collier Cameron A.,
Deleuil M., Figueira P., Gillon M., Lo Curto G., Mayor M., Mordasini C.,
Motalebi F., Moutou C., Pollacco D., Pompei E., Queloz D., Santos N.,
Wyttenbach A.
<Astron. Astrophys. 585, A134 (2016)>
=2016A&A...585A.134D 2016A&A...585A.134D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: techniques: radial velocities - methods: data analysis -
methods: statistical - planetary systems
Abstract:
We present the analysis of the entire HARPS observations of three
stars that host planetary systems: HD1461, HD40307, and HD204313. The
data set spans eight years and contains more than 200 nightly averaged
velocity measurements for each star. This means that it is sensitive
to both long-period and low-mass planets and also to the e ects
induced by stellar activity cycles. We modelled the data using
Keplerian functions that correspond to planetary candidates and
included the short- and long-term effects of magnetic activity. A
Bayesian approach was taken both for the data modelling, which allowed
us to include information from activity proxies such as log(R'HK)
in the velocity modelling, and for the model selection, which
permitted determining the number of significant signals in the system.
The Bayesian model comparison overcomes the limitations inherent to
the traditional periodogram analysis. We report an additional
super-Earth planet in the HD1461 system. Four out of the six planets
previously reported for HD40307 are confirmed and characterised. We
discuss the remaining two proposed signals. In particular, we show
that when the systematic uncertainty associated with the techniques
for estimating model probabilities are taken into account, the current
data are not conclusive concerning the existence of the habitable-zone
candidate HD40307 g. We also fully characterise the Neptune-mass
planet that orbits HD204313 in 34.9 days.
Description:
Each file contains the radial velocity and ancillary measurements
(bisector velocity span, full-width at half-maximum, and activity
indicator) for a star. Measurements were obtained with the HARPS
spectrograph installed at the 3.6-m telescope at La Silla observatory.
For HD204313 additional measurements done with the CORALIE
spectrograph at the Swiss Euler telescope are also reported.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 3 Basic characteristics of the HARPS observations
of the three target stars and rotational periods
hd1461.dat 61 248 HARPS measurements for HD1461
hd40307.dat 61 226 HARPS measurements for HD40307
hd204313.dat 65 193 HARPS and CORALIE measurements for HD204313
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See also:
J/A+A/469/L43 : Radial velocities of Gl 581 (Udry+, 2007)
J/A+A/474/293 : Radial velocities of GJ 674 (Bonfils+, 2007)
J/A+A/493/639 : Velocity curves of HD 40307 (Mayor+, 2009)
J/A+A/493/645 : Gl 176 radial velocities (Forveille+, 2009)
J/A+A/496/513 : RV of 6 stars with long-period giant planets (Moutou+, 2009)
J/A+A/496/521 : Radial velocities of HD45364 (Correia+, 2009)
J/A+A/496/527 : Radial velocity curves of HD 47186 & HD 181433 (Bouchy+, 2009)
J/A+A/507/487 : GJ 581 radial velocity curve (Mayor+, 2009)
J/A+A/511/A21 : Radial velocities of GJ876 planetary system (Correia+, 2010)
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 : HARPS XXIII: RV data for the 8 targets (Naef+, 2010)
J/A+A/526/A111 : Radial velocity of HD 85390, 90156, 103197 (Mordasini+, 2011)
J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)
J/A+A/526/A141 : Velocity monitoring of Gl 676A and HIP 12961 (Forveille+ 2011)
J/A+A/527/A63 : 7 new HARPS planetary systems RV (Moutou+, 2011)
J/A+A/528/A112 : Radial velocities of HD 10180 (Lovis+, 2011)
J/A+A/551/A59 : HD103774, HD109271 and BD-061339 RV curves (Lo Curto+, 2013)
J/A+A/556/A110 : HARPS radial velocities of GJ 163 (Bonfils+, 2013)
J/A+A/566/A35 : Radial velocities of HD 41248 (Santos+, 2014)
J/A+A/575/A119 : 3 HARPS M dwarfs RV and stellar activity
(Astudillo-Defru+, 2015)
J/A+A/576/A48 : Radial velocity monitoring for 6 stars (Moutou+, 2015)
J/A+A/585/A135 : HD175607 RV, logRHK and Halpha index (Mortier+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 12 I3 --- N Total number of spectra
14- 16 I3 --- Nnights Total number of nights on which the target
was observed
18- 27 A10 "date" Obs.start Starting date of observation
29- 38 A10 "date" Obs.end Ending date of observation
40- 43 F4.1 yr Span Time span
45- 47 I3 --- <S/N> Average signal-to-noise ratio computed over
the nightly average spectra at 550nm
49- 52 F4.1 d Prot Rotational period estimated from log(R'HK)
using the relationship by Mamajek &
Hillenbrand (2008, Cat. J/ApJ/687/1264)
54- 56 F3.1 d e_Prot rms uncertainty on Prot
58- 69 A12 --- FileName Name of the file with radial velocity curve
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Byte-by-byte Description of file: hd1461.dat hd204313.dat hd40307.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d BJD Barycentric Julian Date of observation
(BJD-2450000)
12- 19 F8.4 km/s RV Radial velocity
21- 26 F6.4 km/s e_RV Radial velocity uncertainty
28- 33 F6.2 m/s BIS Bisector velocity span of the
cross-correlation function (CCF)
35- 40 F6.4 km/s FWHM Full width at half-maximum of the CCF
42- 48 F7.4 --- logRhk ?=- Activity indicator based on CaII HK
50- 55 F6.4 --- e_logRhk ?=- Uncertainty in the log(R'hk) measurement
57- 65 A9 --- Instr Instrument (HARPS, CORALIE98, or CORALIE07)
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Acknowledgements:
Rodrigo Diaz, rodrigo.diaz(at)unige.ch
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Santos et al., Paper II 2004A&A...426L..19S 2004A&A...426L..19S
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Astudillo-Defru et al., Paper XXXVI 2015A&A...575A.119A 2015A&A...575A.119A, Cat. J/A+A/575/A119
Moutou et al., Paper XXXVII 2015A&A...576A..48M 2015A&A...576A..48M, Cat. J/A+A/576/A48
Mortier et al., Paper XXXIX 2016A&A...585A.135M 2016A&A...585A.135M, Cat. J/A+A/585/A135
(End) Patricia Vannier [CDS] 01-Dec-2015