J/A+A/693/A4 Radial velocities of 51 exoplanets (Osborne+, 2025)
Homogeneous planet masses. I. Reanalysis of archival HARPS radial velocities.
Osborne H.L.M., Nielsen L.D., Van Eylen V., Barragan O.
<Astron. Astrophys. 693, A4 (2025)>
=2025A&A...693A...4O 2025A&A...693A...4O (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: techniques: radial velocities - planets and satellites: detection -
planets and satellites: terrestrial planets
Abstract:
Empirical exoplanet mass-radius relations have been used to study the
demographics and compositions of small exoplanets for many
years. However, the heterogeneous nature of these measurements hinders
robust statistical analysis of this population, particularly with
regard to the masses of planets. For this reason, we perform a
homogeneous and consistent re-analysis of the radial velocity (RV)
observations of 87 small exoplanets using publicly available HARPS RV
data and the fitting toolkit Pyaneti. For the entire sample, we run 12
different models to investigate the impact of modelling choices,
including the use of multi-dimensional Gaussian Processes (GPs) to
mitigate stellar activity. We find that the way orbital eccentricity
is modelled can significantly impact the RV amplitude found in some
cases. We also find that the addition of a GP to mitigate stellar
activity does impact the RV amplitude found - though if the GP is
modelled on activity indicators as well as the RVs the results are
more robust. The RV amplitude found for every planet in our sample
using all the models is made available for other groups to perform
demographics studies. Finally, we provide a list of recommendations
for the RV community moving forward.
Description:
The full HARPS data required to complete the analysis of all targets,
all publicly available on the ESO archive.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
targets.dat 95 51 List of targets
data.dat 176 7502 Full HARPS data
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Byte-by-byte Description of file: targets.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star identifier from Simbad
13- 14 I2 h RAh Simbad right ascension (J2000)
16- 17 I2 min RAm Simbad right ascension (J2000)
19- 23 F5.2 s RAs Simbad right ascension (J2000)
25 A1 --- DE- Simbad declination sign (J2000)
26- 27 I2 deg DEd Simbad declination (J2000)
29- 30 I2 arcmin DEm Simbad declination (J2000)
32- 35 F4.1 arcsec DEs Simbad declination (J2000)
37- 39 A3 --- --- [TIC]
41- 49 I9 --- TIC Star identifier from TESS input catalogue
51- 58 A8 --- --- [Gaia DR2]
60- 78 I19 --- GaiaDR2 Star identifier from Gaia DR2 catalogue
80- 95 A16 --- Planet Planet identifier from NASA Exoplanet Archive
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Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star identifier from Simbad
13- 28 F16.8 d BJD Time, barycentric Julian date
30- 49 F20.16 km/s RV Radial velocity from CCF
51- 70 F20.18 km/s e_RV Radial velocity error
72- 93 F22.20 --- FWHM Full width at half maximum
95-116 F22.20 --- BIS Bisector inverse slope
118-120 A3 --- --- [TIC]
122-130 I9 --- TIC Star identifier from TESS input catalogue
132-139 A8 --- --- [Gaia DR2]
141-159 I19 --- GaiaDR2 Star identifier from GAIA catalogue
161-176 A16 --- Planet Planet identifier from NASA Exoplanet Archive
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Acknowledgements:
Hanna Osborne, hannah.osborne.19(at)ucl.ac.uk
(End) Patricia Vannier [CDS] 18-Nov-2024