Survey for Distant Solar Twins (SDST) -- II. Design, observations and data

Abstract

Studies of solar twins have key impacts on the astronomical community, but only $\sim$100--200 nearby solar twins ($<$ 1 kpc) have been reliably identified over the last few decades. The aim of our survey (SDST) is to identify $\sim$150--200 distant solar twins and analogues (up to $\lesssim$ 4 kpc) closer to the Galactic Centre. We took advantage of the precise Gaia and Skymapper surveys to select Sun-like candidates in a 2-degree field, which were observed with the HERMES spectrograph on the Anglo-Australian Telescope. We successfully built up the required signal-to-noise ratio (25-per-pixel in the HERMES red band) for most targets as faint as Gaia G of 17.4 mag. The stellar photometric/astrometric parameters (e.g., \teff, \logg, mass) of our candidates are derived in this paper, while the spectroscopic parameters will be presented in the third paper in this SDST series. The selection success rate - the fraction of targets which belong to solar twins or analogues - was estimated from simulated survey data and the Besançon stellar population model, and compared with the actual success rate of the survey. We find that expected and actual success rates agree well, indicating that the numbers of solar twins and analogues we discover in SDST are consistent with expectations, affirming the survey approach. These distant solar analogues are prime targets for testing for any variation in the strength of electromagnetism in regions of higher dark matter density, and can make additional contributions to our understanding of, e.g., Galactic chemical evolution in the inner Milky Way.

arXiv comment15 pages, 13 figures. Accepted by MNRAS

References in corpus (72)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Gaia mission
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• New Measurement of the Electron Magnetic Moment and the Fine Structure Constant
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• The GALAH Survey: Scientific Motivation
• Gaia Early Data Release 3: Photometric content and validation
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• The GALAH+ Survey: Third Data Release
• SkyMapper and the Southern Sky Survey
• ESPRESSO@VLT -- On-sky performance and first results
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• The peculiar solar composition and its possible relation to planet formation
• Nominal values for selected solar and planetary quantities: IAU 2015 Resolution B3
• The Anglo-Australian Observatory's 2dF Facility
• On the use of Gaia magnitudes and new tables of bolometric corrections
• High-precision abundances of elements in solar twin stars: Trends with stellar age and elemental condensation temperature
• Can dark matter induce cosmological evolution of the fundamental constants of Nature?
• Stellar populations in the Milky Way bulge region : Towards solving the Galactic bulge and bar shapes using 2MASS data
• SkyMapper Southern Survey: Second Data Release (DR2)
• The colours of the Sun
• Improved limits for violations of local position invariance from atomic clock comparisons
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. VI. Age and abundance structure of the stellar populations in the central sub-kpc of the Milky Way
• The Solar Twin Planet Search. I. Fundamental parameters of the stellar sample
• The Chemical Homogeneity of Sun-like Stars in the Solar Neighborhood
• Evolution of the Fine Structure Constant Driven by Dark Matter and the Cosmological Constant
• Tenth-Order Electron Anomalous Magnetic Moment --- Contribution of Diagrams without Closed Lepton Loops
• Lithium depletion in solar-like stars: no planet connection
• The Besancon Galaxy model renewed I. Constraints on the local star formation history from Tycho data
• High-precision abundances of elements in solar-type stars. Evidence of two distinct sequences in abundance-age relations
• The Solar Twin Planet Search: The age - chromospheric activity relation
• 18 Sco: a solar twin rich in refractory and neutron-capture elements. Implications for chemical tagging
• The nucleosynthetic history of elements in the Galactic disk: [X/Fe] - age relations from high-precision spectroscopy
• The temporal evolution of neutron-capture elements in the Galactic discs
• Solar twins in M67
• The GALAH survey: effective temperature calibration from the InfraRed Flux Method in the Gaia system
• M67-1194, an unusually Sun-like solar twin in M67
• A possible signature of terrestrial planet formation in the chemical composition of solar analogs
• Correlation between lithium abundances and ages of solar twin stars
• HIP 56948: A Solar Twin With a Low Lithium Abundance
• The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc
• The UBV(RI)c colors of the Sun
• The chemical compositions of solar twins in the open cluster M67
• The GALAH survey: The data reduction pipeline
• HD 98618: A Star Closely Resembling our Sun
• The Li-age correlation: the Sun is unusually Li deficient for its age
• Optimal Extraction of Fibre Optic Spectroscopy
• Enhanced constraints on the interior composition and structure of terrestrial exoplanets
• SkyMapper stellar parameters for Galactic Archaeology on a grand-scale
• Search for a Variation of the Fine Structure around the Supermassive Black Hole in Our Galactic Center
• A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun: I. Atmospheric parameters and color similarity to the Sun
• Subaru Telescope limits on cosmological variations in the fine-structure constant
• Quantum-gravity predictions for the fine-structure constant
• Fundamental physics with ESPRESSO: Precise limit on variations in the fine-structure constant towards the bright quasar HE 0515$-$4414
• Detailed chemical compositions of planet hosting stars: I. Exploration of possible planet signatures
• HIP 114328: a new refractory-poor and Li-poor solar twin
• High precision analysis of the solar twin HIP 100963
• Keck/HIRES Spectroscopy of Four Candidate Solar Twins
• New solar twins and the metallicity and temperature scales of the Geneva Copenhagen Survey
• Spectroscopic study of solar twins and analogues
• Solar analogues and Solar twins in the HARPS archive
• Carbon, isotopic ratio ${}^{12}$C/${}^{13}$C and nitrogen in solar twins: constraints for the chemical evolution of the local disc
• Searching for new solar twins: The Inti survey for the Northern Sky
• Variation of $\alpha$ from a Dark Matter Force
• Dust cleansing of star-forming gas I: Did radiation from bright stars affect the chemical composition of the Sun and of M67?
• Survey for Distant Solar Twins (SDST) -- I. EPIC method for stellar parameter measurement

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• Survey for Distant Solar Twins (SDST) -- III. Identification of new solar twin and solar analogue stars
• A revised comparison of distant and nearby solar twins