Orbital parameters and stability map analysis of HD 73344 multiplanetary system

Aster Niel Abellano¹, Bjorn Jasper Raquel¹, Alphagen Pajo^2*, Ruby-Ann Dela Cruz^1,2

¹College of Arts and Sciences, Rizal Technological University, Mandaluyong City, Philippines
²Office of the Vice President for Research, Innovation, and Extension Services, Rizal Technological University, Mandaluyong City, Philippines

* Presenter:Alphagen Pajo, email:alphagenpajo@gmail.com

We study the dynamical stability of the HD 73344 system and tests whether an “amalgam” model—combining strongly coupled planets b and c into one body—can reproduce the stability behavior of HD 73344 while simplifying the setup. We ran MEGNO simulations over the published orbital ranges for two cases: the full three-planet system and the amalgam case. To define the amalgam planet, we used as reference the configuration with MEGNO closest to 2.0, consistent with regular, quasi-periodic motion. All tested three-planet configurations were stable (⟨𝑌⟩ ≈ 2). The amalgam setup resulted in stability and produced stable zones and map that closely matched the full model, with small differences, indicating that the method is useful for simplifying numerical simulations on orbital parameters. Future work should test other compact systems, run longer integrations, and refine the model to better capture resonance effects.

Keywords: MEGNO, Stability Map, Amalgam