Stars & Extreme Objects

The formation, evolution and death of stars, including supernovae, neutron stars and black holes.

2articles

Ilustração do telescópio James Webb diante de uma nebulosa, com dois objetos subestelares avermelhados representando anãs marrons de massa planetária.

Stars & Extreme Objects16/09/20267 min read

Webb found two-Jupiter-mass brown dwarfs: why they challenge star-formation models

In IC 348, Webb confirmed brown dwarfs with estimated masses of about twice Jupiter's. Here is why that strains fragmentation models, what the spectra show, and what the finding st...

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Fonte cósmica vermelha com núcleo escuro cercada por galáxias e por painéis de espectros com numerosas linhas luminosas.

Stars & Extreme Objects10/09/20267 min read

Little red dots: what Webb’s 40+ lines really support about “black hole stars”

GLIMPSE-17775’s spectrum combines electron scattering, H/O/He lines, an iron “forest,” and high-energy diagnostics consistent with the BH* scenario — without settling the question.

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