J/A+A/712/A143 HD 125136, HD 127195, and HD 220218 RV curves (Figueira+, 2026)
CORALIE radial-velocity search for companions around evolved stars (CASCADES).
V. Three planetary companions and achievable precision.
Figueira P., Fontanet E., Faria J. P., Esseldeurs M., Friden E.,
Leleu, A., Luque R., Ottoni G., Segransan D., Stalport M., Tavella S.,
Udry S.
<Astron. Astrophys. 712, A143 (2026)>
=2026A&A...712A.143F 2026A&A...712A.143F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: instrumentation: spectrographs - techniques: radial velocities -
planets and satellites: detection -
planets and satellites: gaseous planets
Abstract:
We extend the planetary census around massive stellar hosts through a
long-term campaign of high-precision radial velocity (RV) measurements
on evolved stars.
We analyse data acquired with the CORALIE spectrograph covering 15-18
years on HD 125136, HD 127195, and HD 220218. Stellar parameters are
derived through different methods for a comprehensive characterization
of each star. We then evaluate the presence of planetary signals in
the RV time series using the Bayesian inference tool kima. Finally, we
design an observing strategy aimed at mitigating the impact of
pulsations on evolved stars and test its effectiveness on the
low-luminosity red giant HD 127195.
We detect signals that are accurately modelled by Keplerian curves in
the RV data of the three stars: one on HD 125136, two on HD 127195,
and one on HD 220218. While the signals on the first two stars seem to
be of planetary origin, the signal on the third one shows several
signs of stellar activity. We therefore identify a planetary companion
around HD 125136 with a minimum mass of 2.26MJup on an 850d orbit,
and on HD 127195 we identify a system composed of planets with
0.66MJup and 0.78 MJup with orbital periods of 535d and 834d,
respectively.
We detect three massive planets around two low-luminosity red giant
stars in a region of the parameter space that is poorly populated in
both stellar mass and planetary orbital periods. The dedicated
observing campaign on HD 127195 showcases how stellar pulsations can
be efficiently averaged out to below 5m/s in low-luminosity giant
stars.
Description:
CORALIE radial velocities for the three stars HD 125136, HD 127195,
and HD 220218. The measurements are divided into the instrumental
datasets COR98, COR07, COR14, and COR24. For HD 127195 we additionally
provide radial velocities obtained during the pulsation-averaged
observing campaign COR25.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
14 21 28.66 -72 19 03.1 HD 125136 = HIP 70175
14 31 29.21 -47 43 46.4 HD 127195 = HIP 71018
23 22 41.52 -61 25 31.1 HD 220218 = HIP 115409
-------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 128 15 List of velocity curve files
rv1/* . 10 Individual velocity curves and indices
rv2/* . 5 Individual velocity curves
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 44 A44 --- FileName Name of the velocity curve file
with subdirectory
46-128 A83 --- Title Title of the file
--------------------------------------------------------------------------------
Byte-by-byte Description of file: rv1/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 F18.12 d BJD Barycentric Julian Date (BJD-2400000)
20- 41 F22.18 m/s RV Radial velocity
43- 61 F19.15 m/s e_RV Uncertainty on RV
63- 83 F21.17 km/s FWHM CCF full width at half maximum
85-102 F18.15 km/s e_FWHM Uncertainty on FWHM
104-125 F22.18 km/s BIS Bisector Inverse Slope
127-145 F19.16 km/s e_BIS Uncertainty on Bisector Inverse Slope
147-162 F16.13 % Contrast CCF contrast
164-168 E5.1 % e_Contrast Uncertainty on contrast
170-187 F18.16 -- Haindex Halpha index
189-208 F20.18 -- e_Haindex Uncertainty on Halpha index
210-228 F19.15 km/s BERV Barycentric Earth Radial velocity
--------------------------------------------------------------------------------
Byte-by-byte Description of file: rv2/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 F18.12 d BJD Barycentric Julian Date (BJD-2400000)
20- 41 F22.18 m/s RV Radial Velocity (average-value subtracted)
43- 61 F19.16 m/s e_RV Radial Velocity uncertainty
--------------------------------------------------------------------------------
Acknowledgements:
Pedro Figueira, Pedro.Figueira(at)iaa.es
License: CC-BY-4.0
(End) Patricia Vannier [CDS] 30-Jun-2026