J/A+A/664/A53 Radial velocities of HD45364 (Stalport+, 2022)
A general stability-driven approach for the refinement of multi-planet systems.
Stalport M., Delisle J.-B., Udry S., Matthews E., Bourrier V., Leleu A.
<Astron. Astrophys. 664, A53 (2022)>
=2022A&A...664A..53S 2022A&A...664A..53S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: planets and satellites: dynamical evolution and stability -
methods: numerical - techniques: radial velocities -
celestial mechanics
Abstract:
Over the past years, the amount of detected multi-planet systems
significantly grew, an important sub-class of which being the compact
configurations. A precise knowledge of them is crucial to understand
the conditions with which planetary systems form and evolve. However,
observations often leave these systems with large uncertainties,
notably on the orbital eccentricities. This is especially prominent
for systems with low-mass planets detected with Radial Velocities
(RV), the amount of which is more and more important in the exoplanet
population. It is becoming a common approach to refine these
parameters with the help of orbital stability arguments.
Such dynamical techniques can be computationally expensive. In this
work we use an alternative procedure faster by orders of magnitude
than classical N-body integration approaches, and with the potential
to narrow down the parameters uncertainties.
We couple a reliable exploration of the parameter space with the
precision of the Numerical Analysis of Fundamental Frequencies (NAFF,
Laskar, 1990, Icarus, 88, 266) fast chaos indicator. We also propose a
general procedure to calibrate the NAFF indicator on any multi-planet
system without additional computational cost. This calibration
strategy is illustrated on HD 45364, in addition to yet-unpublished
measurements obtained with the HARPS and CORALIE high-resolution
spectrographs. We validate the calibration approach by a comparison
with long integrations performed on HD 202696. We test the
performances of this stability-driven approach on two systems with
different architectures. First we study HD 37124, a 3-planet system
composed of planets in the Jovian regime. Then, we analyse the
stability constraints on HD 215152, a compact system of four low-mass
planets.
We revise the planetary parameters in HD 45364, HD 202696, HD 37124
and HD 215152, and provide a comprehensive view of the dynamical state
these systems are in.
We demonstrate the potential of the NAFF stability-driven approach to
refine the orbital parameters and planetary masses. We stress the
importance of undertaking systematic global dynamical analyses on
every new multi-planet system discovered.
Description:
HD45364 radial velocity (RV) measurements obtained with the HARPS
spectrograph installed at the 3.6-m telescope at La Silla observatory,
and with the CORALIE spectrograph installed at the Euler telescope at
the same observatory. These datasets are separated according to
different instrument upgrades (harps03 and harps15 for HARPS, cor98,
cor07 and cor14 for CORALIE). The COR98 RV data are accompanied with
the bissector span (Biss) measurements, and their uncertainties.
Objects:
-----------------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------------
06 25 38.5 -31 28 51 HD 45364 = HIP 30579
-----------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
cor98.dat 41 45 RV and bissector span taken with CORALIE
spectrograph
cor07.dat 28 8 RV data taken with CORALIE spectrograph
cor14.dat 28 15 RV data taken with CORALIE spectrograph
harps03.dat 28 38 RV data taken with HARPS spectrograph
harps15.dat 28 19 RV data taken with HARPS spectrograph
--------------------------------------------------------------------------------
Byte-by-byte Description of file: cor98.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.6 d BJD Barycentric Julian Date of observation
(BJD-2400000)
15- 22 F8.2 m/s RV Radial velocity
25- 28 F4.2 m/s e_RV Radial velocity uncertainty
31- 35 F5.1 m/s BIS Bissector span
37- 41 F5.2 m/s e_BIS Bissector span uncertainty
--------------------------------------------------------------------------------
Byte-by-byte Description of file: cor07.dat cor14.dat harps03.dat harps15.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.6 d BJD Barycentric Julian Date of observation
(BJD-2400000)
15- 22 F8.2 m/s RV Radial velocity
24- 28 F5.2 m/s e_RV Radial velocity uncertainty
--------------------------------------------------------------------------------
Acknowledgements:
Manu Stalport, manu.stalport(at)unige.ch
(End) Patricia Vannier [CDS] 20-May-2022