Identification of false positive double-lined spectroscopic binaries in LAMOST-MRS data due to moonlight contamination

Abstract

We present a method for identifying false positive double-lined spectroscopic binary (SB2) candidates by analysing medium-resolution survey spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR10. Specifically, we focus on spectra contaminated by moonlight, which exhibit near-zero radial velocity (RV) and solar-like spectral lines from the secondary component. By applying strict constraints on the contamination parameters and fitting the contaminated spectra, we ultimately confirmed that 126 false positive binaries are single stars contaminated by moonlight. Additionally, we identify several key factors contributing to moonlight contamination: the lunar phase during observation, the G-band magnitude of the star, and the angular distance between the star and the moon. Notably, artificial satellites in low-orbital can also introduce contamination from solar-like spectral components, but they typically display significantly higher transverse velocities. In a follow-up study, we will expand our analysis to identify additional false positive SB2 systems and systematically classify them according to their contamination sources.

Published in MNRAS

References in corpus (31)

• The Gaia mission
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Gaia Data Release 3: Summary of the content and survey properties
• Gaia Data Release 2: The astrometric solution
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
• The Geneva-Copenhagen Survey of the Solar neighbourhood III. Improved distances, ages, and kinematics
• Kepler Eclipsing Binary Stars. II. 2165 Eclipsing Binaries in the Second Data Release
• The Zwicky Transient Facility Catalog of Periodic Variable Stars
• TESS Eclipsing Binary Stars. I. Short cadence observations of 4584 eclipsing binaries in Sectors 1-26
• A wide star-black-hole binary system from radial-velocity measurements
• Gravitational waves from cosmological compact binaries
• Discovery and Characterization of 3000+ Main-Sequence Binaries from APOGEE Spectra
• Binary Population Synthesis
• Signatures of unresolved binaries in stellar spectra: implications for spectral fitting
• The Galah Survey: Classification and diagnostics with t-SNE reduction of spectral information
• The Gaia-ESO Survey: double, triple and quadruple-line spectroscopic binary candidates
• Double-lined Spectroscopic Binary Stars in the Radial Velocity Experiment Survey
• An all-sky sample of intermediate- to high-mass OBA-type eclipsing binaries observed by TESS
• Double-, triple-line spectroscopic candidates in the LAMOST Medium-Resolution Spectroscopic Survey
• LAMOST Medium-Resolution Spectroscopic Survey (LAMOST-MRS): Scientific goals and survey plan
• The Spectroscopic Binaries from LAMOST Medium-Resolution Survey (MRS). I. Searching for Double-lined Spectroscopic Binaries (SB2s) with Convolutional Neural Network
• IN-SYNC VI. Identification and Radial Velocity Extraction for 100+ Double-Lined Spectroscopic Binaries in the APOGEE/IN-SYNC Fields
• Detection of 2460 SB2 candidates in the LAMOST-MRS, using projected rotational velocities and a binary spectral model
• Single-lined Spectroscopic Binary Star Candidates in the RAVE Survey
• The Value-Added Catalog of ASAS-SN Eclipsing Binaries: Parameters of Thirty Thousand Detached Systems
• The statistical properties of early-type stars from LAMOST DR8
• Stellar adiabatic mass loss model and applications
• The Value-Added Catalog of ASAS-SN Eclipsing Binaries III: Masses and Radii of Gaia Spectroscopic Binaries
• The Value-Added Catalog of ASAS-SN Eclipsing Binaries II: Properties of Extra-Physics Systems