A Minute-Cadence Deep Bulge Survey: First Data Release of DREAMS

Abstract

The DECam Rogue Earths and Mars Survey (DREAMS), a NOIRLab survey program, has been conducting a three-year survey covering a 5 deg${}^2$ area in the Galactic bulge (roughly spanning $-1.2^{\circ }\lesssim \ell \lesssim +2.1^{\circ }$ and $-2.8^{\circ }\lesssim b\lesssim -0.6^{\circ }$) since 2025 June. Its primary science goal is to detect low-mass free-floating planets through microlensing, while its minute-level cadence ($20-40{\mathrm{hr}}^{-1}$ in $z$ band and $4-8{\mathrm{hr}}^{-1}$ in $r$ band) also enables the detection and characterization of rapid phenomena on timescales of minutes to hours such as stellar flares and pulsating stars. The survey reaches a single-exposure depth of $z_{\mathrm{AB}}\sim 22$ mag, about two magnitudes deeper than previous bulge time-domain surveys. We present the data reduction and calibration of the DREAMS observations obtained in 2025 and introduce the first DREAMS data release (DR1). DR1 includes 1,856 $z$-band observations and 325 $r$-band observations for 59,372,789 stars. The DREAMS DR1 catalog contains about twice as many stars as previous catalog covering the same 5 deg${}^2$ area. We present DREAMS light curves for a known blue large-amplitude pulsator (BLAP) and a known low-amplitude transiting system to demonstrate the survey's capabilities. We also perform a pilot search for short-duration variables over about 0.4% of the DR1 sample, identifying one new short microlensing event, two stellar flares, and 24 new short variables. This suggests that DREAMS DR1 may contain hundreds of stellar flares and thousands of previously unknown short variables.

arXiv commentAccepted for publication in ApJS. Data release portal: https://astro.westlake.edu.cn/dreams/

References in corpus (55)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Gaia Data Release 3: Summary of the content and survey properties
• The Transiting Exoplanet Survey Satellite
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• A method for optimal image subtraction
• ATLAS: A High-Cadence All-Sky Survey System
• Las Cumbres Observatory Global Telescope Network
• The Palomar Transient Factory: System Overview, Performance and First Results
• The Dark Energy Camera
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• Kepler Eclipsing Binary Stars. I. Catalog and Principal Characterization of 1879 Eclipsing Binaries in the First Data Release
• Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
• Supernova 2011fe from an Exploding Carbon-Oxygen White Dwarf Star
• An ultraviolet-optical flare from the tidal disruption of a helium-rich stellar core
• VVV DR1: The First Data Release of the Milky Way Bulge and Southern Plane from the Near-Infrared ESO Public Survey VISTA Variables in the Via Lactea
• Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
• No large population of unbound or wide-orbit Jupiter-mass planets
• Kepler Flares II: The Temporal Morphology of White-Light Flares on GJ 1243
• Predictions of the WFIRST Microlensing Survey I: Bound Planet Detection Rates
• Expanding the Realm of Microlensing Surveys with Difference Image Photometry
• Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
• A New Algorithm For Difference Image Analysis
• Optical-Ultraviolet Tidal Disruption Events
• MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand
• The 1995 Pilot Campaign of PLANET: Searching for Microlensing Anomalies through Precise, Rapid, Round-the-Clock Monitoring
• Doppler follow-up of OGLE transiting companions in the Galactic bulge
• The DECam Plane Survey: Optical photometry of two billion objects in the southern Galactic plane
• Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey II: Free-Floating Planet Detection Rates
• Microlensing optical depth and event rate toward the Galactic bulge from 8 yr of OGLE-IV observations
• Blue large-amplitude pulsators as a new class of variable stars
• The Dark Energy Camera Plane Survey 2 (DECaPS2): More Sky, Less Bias, and Better Uncertainties
• Systematic Reanalysis of KMTNet microlensing events, Paper I: Updates of the Photometry Pipeline and a New Planet Candidate
• Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
• The OGLE Collection of Variable Stars. Classical, Type II, and Anomalous Cepheids toward the Galactic Center
• Pulsation in faint blue stars
• Post-common-envelope binary stars, radiative levitation, and blue large-amplitude pulsators
• On the evolutionary status and pulsations of the recently discovered Blue Large-Amplitude Pulsators (BLAPs)
• Which evolutionary status does the Blue Large-Amplitude Pulsators stay at?
• Masses for Free-Floating Planets and Dwarf Planets
• Binary evolution pathways of Blue Large-Amplitude Pulsators
• Prediction of Planet Yields by the PRime-focus Infrared Microlensing Experiment Microlensing Survey
• VIRAC2: NIR Astrometry and Time Series Photometry for 500M+ Stars from the VVV and VVVX Surveys
• Shell helium-burning hot subdwarf B stars as candidates for blue large-amplitude pulsators
• An 18.9-minute Blue Large-Amplitude Pulsator Crossing the 'Hertzsprung Gap' of Hot Subdwarfs
• Photometric Analysis of the OGLE Heartbeat Stars
• The OGLE Collection of Variable Stars. One Thousand Heartbeat Stars in the Galactic Bulge and Magellanic Clouds
• The Prime Focus Infrared Microlensing Experiment (PRIME): First Results
• Systematic Reanalysis of KMTNet Microlensing Events, Paper II: Two New Planets in Giant-Source Events
• Additional Galactic Cepheids from the OGLE Survey
• Observational Parameters of Blue Large-amplitude Pulsators
• How Rare are TESS Free-Floating Planets?
• Over 24 000 Delta Scuti Stars in the Galactic Bulge and Disk from the OGLE Survey
• KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS