A Sample of Compact Object Candidates in Single-lined Spectroscopic Binaries from LAMOST Medium Resolution Survey

TL;DR

This study utilizes LAMOST medium resolution spectra to identify 89 single-lined spectroscopic binary candidates, revealing potential compact objects through radial velocity analysis and light curve examination, contributing to the search for unseen stellar remnants.

Contribution

The paper presents a new catalog of 89 single-lined spectroscopic binary candidates with well-constrained mass functions, highlighting potential compact object hosts using large-scale survey data.

Findings

89 binary candidates identified with well-constrained radial velocity curves.

26 systems have mass functions exceeding 0.1 solar masses, indicating possible compact objects.

18 systems exhibit ellipsoidal light curves, supporting the presence of unseen companions.

Abstract

The stellar spectra from LAMOST Medium Resolution Survey can be used to search for compact objects in binaries. The LAMOST DR10 catalog includes > 980, 000 targets with multiple medium resolution spectra. We select the targets with large or rapid radial velocity variation, and obtained an input-sample of 1822 sources. We use light curves and spectra to identify and exclude eclipsing binaries and double-lined spectroscopic binaries in the input-sample. We finally derive a catalog of 89 candidates with well-folded radial velocity, which are all single-lined spectroscopic binaries, indicating an unseen companion residing in each system. The mass function of each system can be well constrained based on the radial velocity curve. In our sample, 26 sources have mass function higher than 0.1 $M_{\odot}$, among which 18 sources have ellipsoidal type light curves. In our opinion, compact objects are likely existent in all these 26 binaries, which are worth follow-up identification.