2014/10/08 by M. C. Ghilea, Ghilea, Marian C.
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Scientific Research and Discoveries #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.1410.2478
openalex publication_date 2014/10/08 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
The orbits of the confirmed exoplanets from all multiple systems known to\ndate are investigated. Observational data from 1890 objects, of which 1176 are\nfound in multiplanetary systems, are compiled and analyzed. Mean motion\nresonances and near-resonances up to the outer/inner orbital period ratio's\nvalue of 5 and the denominator 4 are tested for all adjacent exoplanet orbits.\nEach host star's snow line is calculated using a simple algorithm. The planets\nare reclassified into categories as a function of the semimajor axis size\nrelative to the snow line location and the semimajor axis vs mass distribution.\nThe fraction of planets in/near resonance is then plotted as a function of both\nresonance number and resonance order for all the exoplanet population and,\nseparately, for each planet type. In the resonance number plot it appears that\nthe 2/1 and 3/2 resonances and near-resonances are dominant overall and for the\ngiant planets, but the observed distribution profile changes significantly with\neach planet category, with terrestrial planets, neptunes and mini-neptunes\nshowing the largest variation. Resonances/near resonances around the value 5/3\nwere dominant for mini neptunes and terrestrial planets. In the order-based\nresonance/near-resonance plot, the observed distribution appears to follow an\nexponential decay for the general population and its profile appears to be\ninfluenced by the planet type. Approximate methods to estimate resonance/near\nresonance distributions are also attempted for the systems with unknown planet\nmass or with unknown star and/or planet mass and compared with the distribution\nof the planets with all the parameters known. A separate study of the\nresonance/near resonance fraction distribution as a function of mass is also\nattempted, but the low statistical data at very high planetary masses prevent\nthe finding of an accurate equation to describe such a dependency.\n