Astronomy
Amateur Telescopes Uncover Ancient Faint Planetary Nebulae
Modern amateur telescopes with long-integration narrow-band imaging at dark-sky sites detect evolved 'ghost' planetary nebulae that have faded into the interstellar medium. Three new candidates (JAM 2, JAM 3, JAM 4), each several arcminutes across with [O III] surface brightness ~30 mag arcsec^{-2},…
SVOM and GOTO Collaboration Reveals Luminous GRB Afterglow with Ambiguous Host Association
The coordinated efforts of SVOM and GOTO enabled rapid localization and multi-wavelength follow-up of GRB 250818B. Analysis of broadband light curves and spectral energy distributions revealed an unusually luminous afterglow, even for a short GRB, indicating refreshed emission. Despite detailed obse…
JWST Detects Carbon Disulfide and Chemical Coupling in a Warm Giant Exoplanet Atmosphere
JWST transmission spectroscopy of exoplanet WASP-80 b reveals the presence of CS2, H2O, CH4, CO2, and NH3. The detected CS2 abundance is significantly higher than previously predicted, supporting recent chemical models that incorporate efficient carbon-sulfur coupling via CH2S. This finding provides…
Methanol Maser Ring Expands at 0.01c, Tracing Explosive Heat Wave from Massive Protostar Outburst
ALMA imaging reveals a circular millimeter methanol maser ring around the outbursting massive protostar G358.93-0.03 MM1, with diameter expanding from ~1100 to ~1800 au over 200 days at ~0.01c. The ring's angular extent follows a power law R ∝ t^{0.39±0.06}, matching the t^{2/5} prediction of the Ta…
BCG Ellipticity as a Biased Proxy for Cluster Halo Orientation
This study evaluates the utility of Brightest Cluster Galaxy (BCG) ellipticity as a proxy for galaxy cluster orientation in SZ-selected samples. While BCG shape correlates with optical richness due to projection effects, it fails to predict 1-halo density profiles and produces 2-halo results that co…
Saros Series 145: A Millennium of Solar Eclipses
Saros Series 145 is a comprehensive solar eclipse cycle spanning from 1639 to 3009. This series comprises 77 eclipses, with 43 being umbral, categorized into annular, hybrid, and total types. The series demonstrates a clear progression from partial to total eclipses, with a peak duration in member 5…