Black hole Sun
Nature Astronomy, Published online: 09 February 2024; doi:10.1038/s41550-024-02214-x Black hole Sun ————— Free Secure Email – Transcom Sigma Transcom Hosting Transcom Premium Domains
A model of planetary formation that predicts migrated steam exoplanets and the radius valley
Nature Astronomy, Published online: 09 February 2024; doi:10.1038/s41550-023-02184-6 The observed ‘radius valley’ — a dip in the distribution of exoplanet radii, which separates rocky super-Earths from larger sub-Neptunes — is at odds with current theories of planetary formation. New simulations
Newly formed dust within the circumstellar environment of SN Ia-CSM 2018evt
Nature Astronomy, Published online: 09 February 2024; doi:10.1038/s41550-024-02197-9 By day 1,041 after explosion, SN Ia-CSM 2018evt had produced an estimated 0.01 solar masses of dust in the cold, dense shell behind the supernova ejecta–circumstellar medium interaction, ranking it as one
A seven-Earth-radius helium-burning star inside a 20.5-min detached binary
Nature Astronomy, Published online: 09 February 2024; doi:10.1038/s41550-023-02188-2 A very uncommon detached binary system with a 20.5-min orbital period has been discovered to harbour a carbon–oxygen white dwarf star and a low-mass subdwarf B star with a seven-Earth radius that
A radius valley between migrated steam worlds and evaporated rocky cores
Nature Astronomy, Published online: 09 February 2024; doi:10.1038/s41550-023-02183-7 A prominent under-density in the observed radius distribution separates small exoplanets in two categories. The study demonstrates, through planet formation and evolution simulations, that the larger planets, whose composition has been disputed,
Early-February thunder (and tornados!) over the Upper Midwest
GOES-16 Band 13 infrared (10.3 µm) imagery and clear-sky derived Lifted Index (scaled from -5 to 10), 1751-2246 UTC on 8 February 2024 (Click to enlarge) The Storm Prediction Center placed portions of the upper Midwest United States in a