J/MNRAS/518/2068 Chaos indicators of exoplanetary systems (Gajdos+, 2023)
Chaos in multiplanetary extrasolar systems.
Gajdos P., Vanko M.
<Mon. Not. R. Astron. Soc. 518, 2068-2075 (2023)>
=2023MNRAS.518.2068G 2023MNRAS.518.2068G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Models
Keywords: methods: numerical -
planets and satellites: dynamical evolution and stability -
stars: planetary systems
Abstract:
Here we present an initial look at the dynamics and stability of 178
multiplanetary systems which are already confirmed and listed in the
NASA Exoplanet Archive. To distinguish between the chaotic and regular
nature of a system, the value of the MEGNO indicator for each system
was determined. Almost three-quarters of them could be labelled as
long-term stable. Only 45 studied systems show chaotic behaviour. We
consequently investigated the effects of the number of planets and
their parameters on the system stability. A comparison of results
obtained using the MEGNO indicator and machine-learning algorithm
SPOCK suggests that the SPOCK could be used as an effective tool for
reviewing the stability of multiplanetary systems. A similar study was
already published by Laskar and Petit. We compared their analysis
based on the AMD criterion with our results. The possible
discrepancies are discussed.
Description:
Chaos indicator MEGNO and Lyapunov time as a result of the simulation
of individual systems and probability of stability based on SPOCK
classifier (Tamayo et al., 2020, Proc. Natl. Acad. Sci., 117, 18194).
For each system, the number of planets is given. Lyapunov-time scale
is expressed in years and the orbital periods of the outer-most
planet.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 79 178 Chaos indicator MEGNO and Lyapunov time as a
result of the simulation of individual systems
and probability of stability based on SPOCK
classifier
--------------------------------------------------------------------------------
See also:
J/A+A/605/A72 : Planetary systems AMD-stability (Laskar+, 2017)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Name Name of the system
19 I1 --- Npl Number of planets
22- 32 F11.8 --- MEGNO Value of MEGNO indicator
36- 47 E12.7 yr LyaTime Lyapunov time in years
52- 63 E12.7 --- LyaTime-P Lyapunov time in orbital periods
68- 79 F12.10 --- SPOCK [0/1]? SPOCK probability
--------------------------------------------------------------------------------
Acknowledgements:
Pavol Gajdos, pavol.gajdos(at)upjs.sk
(End) Patricia Vannier [CDS] 28-Nov-2022