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Measuring the ionisation fraction in a jet from a massive protostar

Sanna, A.; Purser, S. J. D.; Ray, T. P. +7 more

It is important to determine if massive stars form via disc accretion, like their low-mass counterparts. Theory and observation indicate that protostellar jets are a natural consequence of accretion discs and are likely to be crucial for removing angular momentum during the collapse. However, massive protostars are typically rarer, more distant an…

The Macronova in GRB 050709 and the GRB-macronova connection

Li, Xiang; Jin, Zhi-Ping; Covino, Stefano +6 more

GRB 050709 was the first short Gamma-ray Burst (sGRB) with an identified optical counterpart. Here we report a reanalysis of the publicly available data of this event and the discovery of a Li-Paczynski macronova/kilonova that dominates the optical/infrared signal at t>2.5 days. Such a signal would arise from 0.05 r-process material launched by…

An enduring rapidly moving storm as a guide to Saturn's Equatorial jet's complex structure

Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +13 more

Saturn has an intense and broad eastward equatorial jet with a complex three-dimensional structure mixed with time variability. The equatorial region experiences strong seasonal insolation variations enhanced by ring shadowing, and three of the six known giant planetary-scale storms have developed in it. These factors make Saturn's equator a natur…