Deep Drilling in the Time Domain with DECam: Survey Characterization

Abstract

This paper presents a new optical imaging survey of four deep drilling fields (DDFs), two Galactic and two extragalactic, with the Dark Energy Camera (DECam) on the 4 meter Blanco telescope at the Cerro Tololo Inter-American Observatory (CTIO). During the first year of observations in 2021, $>$4000 images covering 21 square degrees (7 DECam pointings), with $\sim$40 epochs (nights) per field and 5 to 6 images per night per filter in $g$, $r$, $i$, and/or $z$, have become publicly available (the proprietary period for this program is waived). We describe the real-time difference-image pipeline and how alerts are distributed to brokers via the same distribution system as the Zwicky Transient Facility (ZTF). In this paper, we focus on the two extragalactic deep fields (COSMOS and ELAIS-S1), characterizing the detected sources and demonstrating that the survey design is effective for probing the discovery space of faint and fast variable and transient sources. We describe and make publicly available 4413 calibrated light curves based on difference-image detection photometry of transients and variables in the extragalactic fields. We also present preliminary scientific analysis regarding Solar System small bodies, stellar flares and variables, Galactic anomaly detection, fast-rising transients and variables, supernovae, and active galactic nuclei.

arXiv comment22 pages, 17 figures, 2 tables. Accepted to MNRAS

References in corpus (45)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Gaia Data Release 2. Summary of the contents and survey properties
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• The SIMBAD astronomical database
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Cosmic Evolution Survey (COSMOS) -- Overview
• Overview of the DESI Legacy Imaging Surveys
• The VizieR database of Astronomical Catalogues
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• The Zwicky Transient Facility: Science Objectives
• Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS
• astroquery: An Astronomical Web-Querying Package in Python
• Active Galactic Nuclei: what's in a name?
• The Zwicky Transient Facility: Surveys and Scheduler
• Cosmological Constraints from Measurements of Type Ia Supernovae discovered during the first 1.5 years of the Pan-STARRS1 Survey
• The Dark Energy Survey Data Release 2
• K-corrections and Extinction Corrections for Type Ia Supernovae
• A Catalog and Atlas of Cataclysmic Variables - The Living Edition
• Proper image subtraction - optimal transient detection, photometry and hypothesis testing
• The DESI Experiment Part II: Instrument Design
• The European Large Area ISO Survey I: Goals, Definition and Observation
• Testing LMC Microlensing Scenarios: The Discrimination Power of the SuperMACHO Microlensing Survey
• The Automatic Learning for the Rapid Classification of Events (ALeRCE) Alert Broker
• The DECam Plane Survey: Optical photometry of two billion objects in the southern Galactic plane
• Automated Transient Identification in the Dark Energy Survey
• The Zwicky Transient Facility Alert Distribution System
• Uncloaking globular clusters in the inner Galaxy
• Fink, a new generation of broker for the LSST community
• Transient processing and analysis using $\text{AMPEL}$: Alert Management, Photometry and Evaluation of Lightcurves
• The Evolution of Flare Activity with Stellar Age
• The Advanced Camera for Surveys General Catalog: Structural Parameters for Approximately Half a Million Galaxies
• The ANTARES Astronomical Time-Domain Event Broker
• First Cosmology Results Using Type Ia Supernovae From the Dark Energy Survey: Survey Overview and Supernova Spectroscopy
• The ESO-Spitzer Imaging extragalactic Survey (ESIS) I: WFI B,V,R deep observations of ELAIS-S1 and comparison to Spitzer and GALEX data
• GROWTH on S190426c. II. Real-Time Search for a Counterpart to the Probable Neutron Star-Black Hole Merger using an Automated Difference Imaging Pipeline for DECam
• Optically variable active galactic nuclei in the 3 yr VST survey of the COSMOS field
• Mapping the Interstellar Reddening and Extinction towards Baade's Window Using Minimum Light Colors of ab-type RR Lyrae Stars. Revelations from the De-reddened Color-Magnitude Diagrams
• Fast algorithms for slow moving asteroids: constraints on the distribution of Kuiper Belt Objects
• A classification algorithm for time-domain novelties in preparation for LSST alerts: Application to variable stars and transients detected with DECam in the Galactic Bulge
• Flare Activity of Wide Binary Stars with Kepler
• Identifying Transients in the Dark Energy Survey using Convolutional Neural Networks

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• High-cadence stellar variability studies of RR Lyrae stars with DECam: New multi-band templates