Tag: #astronomy

NASA Says Roman Telescope Could Detect Around 100,000 Exoplanets

NASA projects its Nancy Grace Roman Space Telescope could detect about 100,000 exoplanets via transits and 1,000+ more by microlensing.

#astronomy, #exoplanets, #nasa, #space-telescope

Webb Measures Massive Black Hole in Tiny Galaxy 700 Million Years After Big Bang

Webb's NIRSpec mapped gas in a z=7.04 'Little Red Dot', finding a 10^7–10^8 solar-mass black hole that may outweigh its primitive host.

#astronomy, #blackhole, #jameswebb, #cosmology, #earlyuniverse

LIGO-Virgo-KAGRA releases GWTC-5.0, expanding gravitational-wave catalog to 390 events

LVK's GWTC-5.0 adds 150 compact-binary candidates from O4b, raising the catalog to 390 events and improving population studies, Hubble estimates and GR tests.

#gravitational-waves, #ligo, #astronomy, #cosmology

JADES releases uniformly modeled catalog of about 500,000 galaxies in GOODS deep fields

JADES DR5 offers a uniform Bayesian catalog of stellar mass, SFR, metallicity and AGN contribution for about 500,000 sources in GOODS-N and GOODS-S.

#jwst, #jades, #galaxies, #astronomy

Fermi Detects Delayed Gamma Rays from Superluminous Supernova SN 2017egm, Supporting Magnetar Power Source

Fermi's LAT saw months-delayed GeV gamma rays from SN 2017egm, offering rare evidence the explosion was powered by a newborn magnetar.

#astronomy, #supernova, #gammarays, #magnetar

CHIME/FRB Finds 30 New Repeating Fast Radio Bursts and No Clear Split Between Repeaters and One‑Offs

CHIME/FRB reports 30 new repeating fast radio burst sources and statistical evidence that repeaters and apparent one‑offs may form a single population.

#frb, #chime, #astronomy, #radioastronomy

Preprint: DESI spectra identify 10,000+ candidate cold gas inflows into galaxies

An arXiv preprint using DESI DR2 spectra reports more than 10,000 candidate cold-gas inflows in z<0.6 galaxies, offering a large but preliminary sample.

#astronomy, #desi, #galaxies, #arxiv

Reanalysis finds no evidence of planetary‑mass primordial black holes in Andromeda data

Independent reanalysis finds 12 short events in Subaru observations of M31 are ordinary stellar variability, not planetary‑mass primordial black holes.

#darkmatter, #primordialblackholes, #astronomy, #andromeda

Study: Possible Thin Atmosphere Detected Around Small Trans‑Neptunian Object 2002 XV93

A May 4 Nature Astronomy paper reports a tenuous atmosphere around plutino (612533) 2002 XV93 based on a single 2024 occultation; independent verification needed.

#transneptunian, #astronomy, #occultation, #pluto

JWST Mid‑Infrared Spectrum Indicates Basaltic Surface, Little Atmosphere on Rocky Exoplanet LHS 3844 b

JWST mid-infrared observations of LHS 3844 b point to a dark, low-silica (basaltic) surface and rule out a thick CO2 or SO2 atmosphere.

#astronomy, #exoplanets, #jwst, #surfacecomposition

JWST and Lensing Reveal Abundant Ultra-Faint Galaxies, Bolstering the Case They Powered Reionization

JWST + lensing study finds abundant ultra-faint galaxies at z≈6–9 with no turnover down to MUV≈−12, bolstering the case that faint galaxies powered reionization.

#astronomy, #jwst, #reionization, #galaxies

Wide JWST Survey Finds Fewer Galaxies at z≈10, Bringing Counts Closer to Spectroscopy

A 36-sightline JWST NIRCam survey reports lower galaxy counts near redshift 10 than earlier photometric studies, aligning better with spectroscopic results.

#jwst, #astronomy, #galaxies, #cosmology

DESI completes five-year survey; will continue through 2028 to probe dark energy

The Dark Energy Spectroscopic Instrument finished its original five‑year survey, mapping 47M+ objects. DESI will continue through 2028 to test whether dark energy evolves.

#astronomy, #darkenergy, #cosmology, #desi

SPHEREx maps vast interstellar ices and carbon-rich dust across Cygnus X and North American Nebula

NASA’s SPHEREx produced large near-infrared spectral maps revealing water, CO2 and PAH distributions across star-forming regions like Cygnus X.

#astronomy, #spherex, #interstellarice, #milkyway

Astronomers Report Possible Direct Detection of Ionizing UV from Faint Galaxies at Redshift 6

A new arXiv preprint reports stacked detections of extreme‑UV photons from faint galaxies at z≈6, implying high escape fractions if confirmed.

#astronomy, #reionization, #astrosat, #hubble