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High-Redshift Cosmology in the JWST Era: ΛCDM Tension, Early Massive Galaxies, and the 21 cm Frontier
Abstract: Tracing the Universe’s Origins High-redshift cosmology (z≳6), spanning the Cosmic Dawn and the Epoch of Reionization (EoR), currently stands as the central frontier of astrophysics. This review synthesizes recent findings, particularly those enabled by the James Webb Space Telescope (JWST), against the backdrop of the standard ΛCDM cosmological model. JWST has fundamentally altered the…
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The 9:1 Battle for Time: The Operational Framework and the Dual-Anonymous System that Selects the Universe’s Next Great Discoveries
Summary, Step-by-Step Guide to JWST Proposal Success, and Comprehensive Proposal Checklist The James Webb Space Telescope (JWST) was designed with multiple, complementary access policies—primarily the General Observer (GO) program (open competition), the Guaranteed Time Observations (GTO) (rewarding instrument developers with about 16% of the first three cycles), and Director’s Discretionary Time (DDT) (reserved for time-critical…
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The Mysterious Discovery of JWST That No One Saw Coming
Are We Inside a Cosmic Whirlpool? Recent JWST Advanced Deep Extragalactic Survey (JADES) observations of mysterious cosmological anomalies in the rotational patterns of galaxies challenge our understanding of the universe and reveal surprising connections to natural growth patterns. The rotation of 263 galaxies has been studied by Lior Shamir of Kansas State University, with 158…
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Protoplanetary Disc Oph163131 – Surface Layers Lack Grains Larger than 1 µm
JWST imaging of edge-on protoplanetary disks. III. Drastic morphological transformation across the mid-infrared in Oph163131. Marion Villenave et. al. https://t.co/aMCnahCjLs pic.twitter.com/NZDlPOVrjK — AstroArxiv (@AstroArxiv) October 2, 2024 https://platform.twitter.com/widgets.js “The lack of sharp-edged structures in the extended patchy emission argues against the presence of shocks and suggests photoexcitation or stochastic heating of material smoothly flowing away…
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Detect Water in Protoplanetary Discs with JWST-MIRI Tools
“The analysis suggests that all nascent planetary systems may have the same water resources that we did.”
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Impact of Circumstellar Debris Disk on the Atmosphere of Exoplanet WASP-39b
Even faint debris disks can contaminate MIRI exoplanet spectra. WASP-39b is a gas giant exoplanet orbiting a G-type star, located about 700 light-years away in the constellation Virgo. It has a mass of approximately 0.28 times that of Jupiter and a radius 1.27 times that of Jupiter. The planet orbits its star every 4.1 days…
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Surprise – Comets Are Showing A Range of Icy Structures
Using its Near Infrared Camera (NIRCam) the James Webb Space Telescope (JWST) has the capability to measure the structure of ice. Likely a new challenge for the accretion model. Expected was either crystalline or amorphous ice in comets depending on the temperature in the protoplanetary disk.
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HH 48 NE Protoplanetary Disk Ices at High Disk Altitudes
“To explain the presence of ices at high disk altitudes, we propose two possible scenarios: a disk wind that entrains sufficient amounts of dust, thus blocking part of the stellar UV radiation, or vertical mixing that cycles enough ices into the upper disk layers to balance ice photodesorption.” HH 48 NE is a protostar located…
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Formalhaut A with First Asteroid Belt Seen Outside Solar System
Fomalhaut A is a bright star and was known to the Persian and Arabic Astronomers. The name of the star is Arabic and means “mouth of the fish”. It belongs to a Tripple Star System 25 light-years away from earth. Formalhaut A has several notable characteristics: Fomalhaut Dusty Debris Disk (MIRI Image), James Webb Telescope…
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HL Tau Protoplanetary Disk Contains More Water Than Earth
The observations show that there is at least three times more water in the inner disc of the young Sun-like star HL Tauri than in all of Earth’s oceans combined. HL Tau also called HL Tauri is a young T Tauri star located approximately 450 light-years away from earth in the Taurus Molecular Cloud. It…
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Circular Astronomy 