Compact object candidates with K/M-dwarf companions from LAMOST low-resolution survey

Searching for compact objects (black holes, neutron stars, or white dwarfs) in the Milky Way is essential understanding stellar evolution history, physics of objects, and structure our Galaxy. Compact binaries with a luminous companion are perfect targets optical observations. Candidate can be achieved by monitoring radial velocities star. However, most spectroscopic telescopes usually obtain spectra at relatively low efficiency, which makes sky survey millions stars practically impossible. The efficiency large-scale survey, Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST), presents specific opportunity to search object candidates, i.e., simply from Late-type K/M abundant populations Owing large Keplerian close K/M-dwarf companion, hidden could discovered followed-up more easily. In this study, candidates companions investigated LAMOST low-resolution spectra. Based on Data Release 5, we obtained sample $56$ binaries, each containing velocity variation $\Delta V_{\rm R} > 150~{\rm km~s}^{-1}$. Complemented photometric information Transiting Exoplanet Survey Satellite, derived $35$ among which, orbital periods $16$ sources were revealed light curves. Considering two as examples, confirmed that existed systems fitting curve. This study demonstrates principle power searching through LAMOST.