Minute-cadence Observations of the LAMOST Fields with the TMTS: I. Methodology of Detecting Short-period Variables and Results from the first-year Survey

Abstract

Tsinghua University-Ma Huateng Telescopes for Survey (TMTS), located at Xinglong Station of NAOC, has a field of view upto 18 deg^2. The TMTS has started to monitor the LAMOST sky areas since 2020, with the uninterrupted observations lasting for about 6 hours on average for each sky area and a cadence of about 1 minute. Here we introduce the data analysis and preliminary scientific results for the first-year observations, which covered 188 LAMOST plates ( about 1970 deg^2). These observations have generated over 4.9 million uninterrupted light curves, with at least 100 epochs for each of them. These light curves correspond to 4.26 million Gaia-DR2 sources, among which 285 thousand sources are found to have multi-epoch spectra from the LAMOST. By analysing these light curves with the Lomb-Scargle periodograms, we identify more than 3700 periodic variable star candidates with periods below 7.5 hours, primarily consisting of eclipsing binaries and Delta Scuti stars. Those short-period binaries will provide important constraints on theories of binary evolution and possible sources for space gravitational wave experiments in the future. Moreover, we also identified 42 flare stars by searching rapidly-evolving signals in the light curves. The densely-sampled light curves from the TMTS allow us to better quantify the shapes and durations for these flares.

arXiv comment16 pages, 20 figures, accepted for publication in MNRAS

References in corpus (54)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• A method for optimal image subtraction
• First Results from the Catalina Real-time Transient Survey
• Understanding the Lomb-Scargle Periodogram
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• The Palomar Transient Factory: System Overview, Performance and First Results
• Exploring the Optical Transient Sky with the Palomar Transient Factory
• Correcting systematic effects in a large set of photometric lightcurves
• The Catalina Surveys Periodic Variable Star Catalog
• A $Gaia$ Data Release 2 catalogue of white dwarfs and a comparison with SDSS
• Assessing statistical significance of periodogram peaks
• Discovery of a Candidate Black Hole - Giant Star Binary System in the Galactic Field
• A Catalog and Atlas of Cataclysmic Variables - The Living Edition
• Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys
• A wide star-black-hole binary system from radial-velocity measurements
• A Volume Limited Sample of Cataclysmic Variables from $Gaia$ DR2: Space Density and Population Properties
• {\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip
• PPM-Extended (PPMX) - a catalogue of positions and proper motions
• Controlling the False Discovery Rate in Astrophysical Data Analysis
• General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system
• A White Dwarf catalogue from Gaia-DR2 and the Virtual Observatory
• The population of hot subdwarf stars studied with Gaia II. The Gaia DR2 catalogue of hot subluminous stars
• Cataclysmic Variables from the Catalina Real-time Transient Survey
• Comparative performance of selected variability detection techniques in photometric time series
• The Deep Lens Survey Transient Search I : Short Timescale and Astrometric Variability
• The ultracompact nature of the black hole candidate X-ray binary 47 Tuc X9
• Population of hot subdwarf stars studied with Gaia III. Catalogue of known hot subdwarf stars: Data Release 2
• A Package for the Automated Classification of Periodic Variable Stars
• Blue large-amplitude pulsators as a new class of variable stars
• The Photometric System of Tsinghua-NAOC 80-cm Telescope at NAOC Xinglong Observatory
• Gaia Data Release 2 Catalogue of Extremely-low Mass White Dwarf Candidates
• Using electromagnetic observations to aid gravitational-wave parameter estimation of compact binaries observed with LISA
• The SARS algorithm: detrending CoRoT light curves with Sysrem using simultaneous external parameters
• A Population of Faint Non-Transient Low Mass Black Hole Binaries
• The nature of the DLS fast transients
• LAMOST Medium-Resolution Spectroscopic Survey (LAMOST-MRS): Scientific goals and survey plan
• Black Holes in Short Period X-ray Binaries and the Transition to Radiatively Inefficient Accretion
• The Tsinghua University-Ma Huateng Telescopes for Survey: Overview and Performance of the System
• Search for Dormant Black Holes in Ellipsoidal Variables I. Revisiting the Expected Amplitudes of the Photometric Modulation
• The OmegaWhite Survey for Short-Period Variable Stars I: Overview and First Results
• RApid Temporal Survey - RATS I: Overview and first results
• The Faint Sky Variability Survey I: Goals and data reduction process
• $K2$ Ultracool Dwarfs Survey. VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs
• Robust, open-source removal of systematics in Kepler data
• DRAFTS: A Deep, Rapid Archival Flare Transient Search in the Galactic Bulge
• A catalog of over ten million variable source candidates in ZTF data release 1
• Classification of Periodic Variable Stars with Novel Cyclic-Permutation Invariant Neural Networks
• Search for Dormant Black Holes in Ellipsoidal Variables III. The OGLE BULGE Short-Period Sample
• Search for Dormant Black Holes in Ellipsoidal Variables II. A Binary Modified Minimum Mass Ratio
• Using radial velocities to reveal black holes in binaries: a test case

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• Minute-Cadence Observations of the LAMOST Fields with the TMTS: II. Catalogues of Short-Period Variable Stars from the First Two-Year Surveys
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