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Evidence for a radiation belt around a brown dwarf
Pérez-Torres, M.; Guirado, J. C.; Marcaide, J. M. +2 more
Ultracool dwarfs (UCDs) are a category of astronomical objects that includes brown dwarfs and very-low-mass stars. Radio observations of UCDs have measured their brightness as a function of time (light curves) and spectral energy distributions, providing insight into their magnetic fields. We present spatially resolved radio observations of the br…
Optical polarization from colliding stellar stream shocks in a tidal disruption event
Blinov, D.; Liodakis, I.; Berton, M. +9 more
A tidal disruption event (TDE) occurs when a supermassive black hole rips apart a passing star. Part of the stellar material falls toward the black hole, forming an accretion disk that in some cases launches a relativistic jet. We performed optical polarimetry observations of a TDE, AT 2020mot. We find a peak linear polarization degree of 25 ± 4%,…
Thin jets underlie the solar wind
Ugarte-Urra, Ignacio; Wang, Yi-Ming
The Solar Orbiter spacecraft was launched in 2020 by the European Space Agency to study how solar activity drives changes in the inner part of the heliosphere, the region that extends from the Sun to the surrounding interstellar medium. The Solar Orbiter is fitted with a suite of in situ and remote-sensing instruments that allow measurement of the…