# New Solutions for the Planetary Dynamics in HD160691 using a Newtonian Model and Latest Data - Astrophysics

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Abstract: In this letter we present several new three and four-planet solutions basedon the most current available radial velocity data for HD160691 $\mu$Ara.These solutions are optimised using the Planetary Orbit Fitting Process POFPwhich is programmed and executed in MATLAB. POFP is based on a full integrationof the system-s multiple-body Newtonian equations of motion and on a multilevel optimisation utilizing a variety of algorithms. The POFP solutions arepresented in the context of the Keplerian-based solutions already appearing inthe literature which we have reproduced here for comparison. The differentsolutions and their properties are compared over all data sets separately andcombined. The new solutions do not seem to exhibit instabilities and are bothco-planar and three-dimensional. We also provide a comparative prediction ofthe published and new solutions showing their diversion in the near future. Inthe short term, this projection will allow to choose between the variety ofsolutions as further observations are made.

Autor: D. Short, G. Windmiller, J. A. Orosz

Fuente: https://arxiv.org/