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A planetary collision afterglow and transit of the resultant debris cloud

Planets grow in rotating disks of dust and gas around forming stars, some of which can subsequently collide in giant impacts after the gas component is removed from the disk1–3. Monitoring programmes with the warm Spitzer mission have recorded substantial and rapid changes in mid-infrared output for several stars, interpreted as variations in the surface area of warm, dusty material ejected by planetary-scale collisions and heated by the central star: for example, NGC 2354–ID8 (refs. 4,5), HD 166191 (ref. 6) and V488 Persei7. Here we report combined observations of the young (about 300 million years old), solar-like star ASASSN-21qj: an infrared brightening consistent with a blackbody temperature of 1,000 Kelvin and a luminosity that is 4 percent that of the star lasting for about 1,000 days, partially overlapping in time with a complex and deep, wavelength-dependent optical eclipse that lasted for about 500 days. The op ....

United States , Distrito Federal , Rizzo Smith , Astronomical Society Of The Pacific , Analysis Center , Sky Automated Survey For Supernovae , American Chemical Society , G All Sky Automated Survey Catalog , Astrophysics Source Code Library , Exoplanet Survey Satellite , Sky Automated , Astronomical Data Analysis Software , Space Sci , All Sky Automated Survey , All Sky Automated , Acta Astron , Sky Automated Survey , Vizier On Line Data Catalog , Remote Observatory Atacama Desert , Variable Star Observers , Release Products , Infrared Processing , Astronomical Society , Open Science , Milky Way , Large Magellanic Cloud ,

Subsecond periodic radio oscillations in a microquasar

Powerful relativistic jets are one of the ubiquitous features of accreting black holes in all scales1–3. GRS 1915 + 105 is a well-known fast-spinning black-hole X-ray binary4 with a relativistic jet, termed a ‘microquasar’, as indicated by its superluminal motion of radio emission5,6. It has exhibited persistent X-ray activity over the last 30 years, with quasiperiodic oscillations of approximately 1–10 Hz (refs. 7–9) and 34 and 67 Hz in the X-ray band10. These oscillations probably originate in the inner accretion disk, but other origins have been considered11. Radio observations found variable light curves with quasiperiodic flares or oscillations with periods of approximately 20–50 min (refs. 12–14). Here we report two instances of approximately 5-Hz transient periodic oscillation features from the source detected in the 1.05- to 1.45-GHz radio band that occurred in January 2021 and June 2022. Circular pol ....

United Kingdom , Ms High Energy Astrophysics , Astrophysics Source Code Library , Astropy Project , High Energy ,

Employing AI for Prostate Cancer Prediction on Biopsies

A new study demonstrates that AI can detect and grade PCa in biopsies in a manner comparable to pathologists. ....

Southwest Finland , United States , United Kingdom , Landskapet Sodra Savolax , Eteläuomen Läi , Northern Ostrobothnia , Cohen Kappa , Megan Craig , Traksel Shutterstock , Breast Cancer Research , Nature Communications , Rr Core Team , International Society Of Urological Pathology , Helsinki University Hospital , Genomics Using Convolutional Networks , Neural Network For Prostate Cancer Discovery , Astrophysics Source Code Library , Grade Group , Gleason Score , International Society , Urological Pathology , Image Credit , Malignant Cases Grade , Prostate Biopsies Predicts Cancer , Whole Slide Imaging , Primary Diagnosis ,