Discovery and spectroscopic confirmation of DELVE 8/Gemini I as an ultra-faint compact Milky Way satellite at 120 kpc with low metallicity upper limit.
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JWST observations of ERQs show stratified gas kinematics via deblended optical emission lines, with UV lines dominated by scattered light and optical lines mixing scattered and obscured emission.
300S stellar stream exhibits three density peaks, smooth width variations, a possible 4.7 degree gap, and a kink modeled as resulting from Large Magellanic Cloud interaction across its full known footprint.
DESI's instrumentation, including a 3.2-degree prime-focus corrector, 5020 fiber positioners across ten petals, and ten three-channel spectrographs, has been successfully installed and meets all performance goals for a five-year survey of 40 million galaxies and quasars.
Pantheon+ delivers tighter SN Ia constraints on Ω_M, w0, wa, and H0 from 1550 events, consistent with a cosmological constant, with SN systematics contributing less than one third to H0 uncertainty.
The DECam Shadow Survey has detected variable LBV eruptions in AT2017des with peaks brightening by ~0.05 mag per year, reaching luminosities similar to extreme SN impostors.
The MAGIC survey provides photometric metallicities for RGB stars over ~3000 deg² using CaHK narrow-band imaging plus DELVE g,r,i data, recovering 13/14 known ultra-faint dwarfs and confirming a distant Reticulum II member.
No kilonova detected from sub-solar GW candidate S251112cm, but coincident IIb supernova SN 2025adtq yields suggestive evidence for the superkilonova channel, though inconclusive after accounting for chance coincidence.
YOSO applies a Gaussian Motion Filter to detect faint slow-moving Solar System objects in wide-field images, recovering known targets and identifying new ones with very low false positives.
BayeSN analysis of ZTF Type Ia supernovae confirms a ~0.1 mag intrinsic environmental step in standardized brightness that is not explained by differences in dust extinction properties.
Non-detection of kilonova from S250206dm excludes AT 2017gfo-like events and disfavors NS-BH mergers with mass ratio Q >= 3.2, reaching GW-comparable precision on the mass gap candidate.
Composite cluster stellar mass functions show marginal M* evolution at high z and a factor of 2.5 growth in stellar mass fraction from z=0.8 to 0.2 after accounting for halo mass growth.
Sextans dSph is a composite system from a minor merger 13 Gyr ago, with metal-poor core and more evolved accreted envelope showing inverse metallicity gradient.
Multi-wavelength analysis of 966 low surface brightness galaxies finds short star formation episodes, mass-dependent quenching, and a marginal 8% size increase linked to star formation.
MUST is a new 6.5 m telescope designed to deliver simultaneous optical spectra for over 20,000 targets across a 5 deg² field, enabling the largest 3D spectroscopic map of the Universe with redshifts for more than 100 million objects over an 8-year survey.
Three new planets detected via 2023 KMTNet microlensing with mass ratios log q ~ -1.9, -2.0, -2.6; overall 2023 sample of 25 planets matches prior mass-ratio distribution.
Photometric metallicities from DECam identify 213 Jet stream candidates and detect fanning in the stream morphology.
Larger TNO sample with phase corrections shows color-phase angle correlations but no strong bimodality or orbital links, plus first Rubin photometric measurements for eight objects.
Rubin Observatory delivers the earliest large-telescope astrometry and grizy photometry of interstellar comet 3I/ATLAS, including colors and a dust-to-nucleus cross-section ratio lower limit.
DES BAO and supernova data combined with CMB favor evolving dark energy at about 3 sigma, challenging the cosmological constant model.
citing papers explorer
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Discovery and Spectroscopic Characterization of a Distant, Compact Milky Way Satellite in Gemini
Discovery and spectroscopic confirmation of DELVE 8/Gemini I as an ultra-faint compact Milky Way satellite at 120 kpc with low metallicity upper limit.
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Kinematic Stratification in Extremely Red Quasars Revealed by JWST
JWST observations of ERQs show stratified gas kinematics via deblended optical emission lines, with UV lines dominated by scattered light and optical lines mixing scattered and obscured emission.
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Sifting for a Stream: The Morphology of the $300S$ Stellar Stream
300S stellar stream exhibits three density peaks, smooth width variations, a possible 4.7 degree gap, and a kink modeled as resulting from Large Magellanic Cloud interaction across its full known footprint.
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Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
DESI's instrumentation, including a 3.2-degree prime-focus corrector, 5020 fiber positioners across ten petals, and ten three-channel spectrographs, has been successfully installed and meets all performance goals for a five-year survey of 40 million galaxies and quasars.
-
The Pantheon+ Analysis: Cosmological Constraints
Pantheon+ delivers tighter SN Ia constraints on Ω_M, w0, wa, and H0 from 1550 events, consistent with a cosmological constant, with SN systematics contributing less than one third to H0 uncertainty.
-
First Results from the LSST Shadow Survey: The Restless Luminous Blue Variable AT2017des in the Virgo-Cluster Galaxy, NGC4532
The DECam Shadow Survey has detected variable LBV eruptions in AT2017des with peaks brightening by ~0.05 mag per year, reaching luminosities similar to extreme SN impostors.
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The DECam MAGIC Survey $-$ Mapping the Ancient Galaxy in CaHK: Overview and Summary of Early Science
The MAGIC survey provides photometric metallicities for RGB stars over ~3000 deg² using CaHK narrow-band imaging plus DELVE g,r,i data, recovering 13/14 known ultra-faint dwarfs and confirming a distant Reticulum II member.
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Electromagnetic Follow-up of the Sub-Solar Mass Gravitational Wave Candidate S251112cm: Kilonova Constraints and a Coincident IIb Supernova
No kilonova detected from sub-solar GW candidate S251112cm, but coincident IIb supernova SN 2025adtq yields suggestive evidence for the superkilonova channel, though inconclusive after accounting for chance coincidence.
-
You Only Stack Once (YOSO): A Motion-Filtered, Deep-Learning Framework for Detecting Faint Moving Sources
YOSO applies a Gaussian Motion Filter to detect faint slow-moving Solar System objects in wide-field images, recovering known targets and identifying new ones with very low false positives.
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On the origin of the environmental step: A BayeSN view of the ZTF SN Ia DR2
BayeSN analysis of ZTF Type Ia supernovae confirms a ~0.1 mag intrinsic environmental step in standardized brightness that is not explained by differences in dust extinction properties.
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Illuminating the Mass Gap Through Deep Optical Constraint on a Neutron Star Merger Candidate S250206dm
Non-detection of kilonova from S250206dm excludes AT 2017gfo-like events and disfavors NS-BH mergers with mass ratio Q >= 3.2, reaching GW-comparable precision on the mass gap candidate.
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The Atacama Cosmology Telescope: stellar mass growth in massive galaxy clusters from DR5 over the past 7 billion years
Composite cluster stellar mass functions show marginal M* evolution at high z and a factor of 2.5 growth in stellar mass fraction from z=0.8 to 0.2 after accounting for halo mass growth.
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Spatially resolved star formation history of Sextans dSph
Sextans dSph is a composite system from a minor merger 13 Gyr ago, with metal-poor core and more evolved accreted envelope showing inverse metallicity gradient.
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Systematically Measuring Ultra-Diffuse Galaxies. IX. A Gyr in the Life of Nearby Low Surface Brightness Galaxies
Multi-wavelength analysis of 966 low surface brightness galaxies finds short star formation episodes, mass-dependent quenching, and a marginal 8% size increase linked to star formation.
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From Large Telescopes to the MUltiplexed Survey Telescope (MUST)
MUST is a new 6.5 m telescope designed to deliver simultaneous optical spectra for over 20,000 targets across a 5 deg² field, enabling the largest 3D spectroscopic map of the Universe with redshifts for more than 100 million objects over an 8-year survey.
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Mass Production of 2023 KMTNet Microlensing Planets. III: Three Planets from the Subprime Field
Three new planets detected via 2023 KMTNet microlensing with mass ratios log q ~ -1.9, -2.0, -2.6; overall 2023 sample of 25 planets matches prior mass-ratio distribution.
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The DECam MAGIC Survey: Investigating the Jet Stellar Stream with Photometric Metallicities
Photometric metallicities from DECam identify 213 Jet stream candidates and detect fanning in the stream morphology.
-
Historical Surveys to Rubin First Look: Absolute Colors of trans-Neptunian objects
Larger TNO sample with phase corrections shows color-phase angle correlations but no strong bimodality or orbital links, plus first Rubin photometric measurements for eight objects.
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NSF-DOE Vera C. Rubin Observatory Observations of Interstellar Comet 3I/ATLAS (C/2025 N1)
Rubin Observatory delivers the earliest large-telescope astrometry and grizy photometry of interstellar comet 3I/ATLAS, including colors and a dust-to-nucleus cross-section ratio lower limit.
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Challenges to the cosmological constant model following results from the Dark Energy Survey
DES BAO and supernova data combined with CMB favor evolving dark energy at about 3 sigma, challenging the cosmological constant model.