0000000000429516

AUTHOR

Carolus J. Schrijver

showing 2 related works from this author

Bright hot impacts by erupted fragments falling back on the Sun: UV redshifts in stellar accretion

2014

A solar eruption after a flare on 7 Jun 2011 produced EUV-bright impacts of fallbacks far from the eruption site, observed with the Solar Dynamics Observatory. These impacts can be taken as a template for the impact of stellar accretion flows. Broad red-shifted UV lines have been commonly observed in young accreting stars. Here we study the emission from the impacts in the Atmospheric Imaging Assembly's UV channels and compare the inferred velocity distribution to stellar observations. We model the impacts with 2D hydrodynamic simulations. We find that the localised UV 1600A emission and its timing with respect to the EUV emission can be explained by the impact of a cloud of fragments. The …

Stars: formationYoung stellar objectAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysicslaw.inventionSettore FIS/05 - Astronomia E AstrofisicaSun: X-rays gamma raylawAstrophysics::Solar and Stellar AstrophysicsSurface layerAstrophysics::Galaxy AstrophysicsSolar and Stellar Astrophysics (astro-ph.SR)PhysicsSolar flareSun: coronaGamma rayAstronomy and AstrophysicsCircumstellar matterSun: UV radiationRedshiftAccretion (astrophysics)StarsAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceAstrophysics::Earth and Planetary AstrophysicsFlare
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Bright hot impacts by erupted fragments falling back on the Sun: a template for stellar accretion.

2013

Impacts of falling fragments observed after the eruption of a filament in a solar flare on 7 June 2011 are similar to those inferred for accretion flows on young stellar objects. As imaged in the ultraviolet (UV)-extreme UV range by the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory, many impacts of dark, dense matter display uncommonly intense, compact brightenings. High-resolution hydrodynamic simulations show that such bright spots, with plasma temperatures increasing from ~10(4) to ~10(6) kelvin, occur when high-density plasma (>>10(10) particles per cubic centimeter) hits the solar surface at several hundred kilometers per second, producing high-energy emission as …

PhysicsMultidisciplinarySolar flareInfraredAstrophysics::High Energy Astrophysical PhenomenaYoung stellar objectAstronomyAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsPlasmamedicine.disease_causeAccretion (astrophysics)AstrophysicProtein filamentStarsSettore FIS/05 - Astronomia E AstrofisicaSolar PhysicHydrodynamicsmedicineAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsUltravioletScience (New York, N.Y.)
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