A new method based on Markov chains for deriving SB2 orbits directly from their spectra

TL;DR

This paper introduces a novel Markov chain-based method to directly derive orbital elements of SB2 binary stars from their spectra, aiming for high-precision mass measurements without relying on templates.

Contribution

The paper presents a new spectral disentangling technique combined with Markov chains to determine SB2 orbital parameters directly from spectra, improving accuracy and efficiency.

Findings

Achieved orbital parameter estimation with better than 1% precision.

Demonstrated the method on simulated and real SB2 spectra.

Enhanced spectral disentangling without templates.

Abstract

We present a new method to derive orbital elements of double-lined spectroscopic binaries (SB2). The aim is to have accurate orbital parameters of a selection of SB2 in order to prepare the exploitation of astrometric Gaia observations. Combined with our results, they should allow one to measure the mass of each star with a precision of better than 1%. The new method presented here consists of using the spectra at all epochs simultaneously to derive the orbital elements without templates. It is based on a Markov chain including a new method for disentangling the spectra.