0000000000373010

AUTHOR

Stephen L. Skinner

showing 3 related works from this author

Flares from small to large: X-ray spectroscopy of Proxima Centauri with XMM-Newton

2003

(Abridged) We report results from a comprehensive study of the nearby M dwarf Proxima Centauri with the XMM-Newton satellite. We find strongly variable coronal X-ray emission, with flares ranging over a factor of 100 in peak flux. The low-level emission is found to be continuously variable. Several weak flares are characteristically preceded by an optical burst, compatible with predictions from standard solar flare models. We propose that the U band bursts are proxies for the elusive stellar non-thermal hard X-ray bursts suggested from solar observations. A very large X-ray flare was observed in its entirety, with a peak luminosity of 3.9E28 erg/s [0.15-10 keV] and a total X-ray energy of 1…

010504 meteorology & atmospheric sciencesOpacityAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesFluxAstrophysicsAstrophysics01 natural scienceslaw.inventionLuminositylaw0103 physical sciencesAstrophysics::Solar and Stellar Astrophysicsstars: activity stars: coronae stars: individual: Proxima Centauri X-rays: starsSpectroscopy010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesPhysicsSolar flareAstrophysics (astro-ph)Astronomy and AstrophysicsPlasma3. Good healthStars13. Climate actionSpace and Planetary SciencePhysics::Space PhysicsAstrophysics::Earth and Planetary AstrophysicsFlare
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The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)

2007

(abridged:) The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) surveys the most populated ~5 square degrees of the Taurus star formation region, using the XMM-Newton X-ray observatory to study the thermal structure, variability, and long-term evolution of hot plasma, to investigate the magnetic dynamo, and to search for new potential members of the association. Many targets are also studied in the optical, and high-resolution X-ray grating spectroscopy has been obtained for selected bright sources. The X-ray spectra have been coherently analyzed with two different thermal models (2-component thermal model, and a continuous emission measure distribution model). We present ov…

stars : pre-main sequence010504 meteorology & atmospheric sciencesAstrophysics::High Energy Astrophysical PhenomenaBrown dwarfFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics01 natural sciencesLuminosity[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]Observatory0103 physical sciencesProtostarAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesPhysicsstars : formationStar formationMolecular cloudAstrophysics (astro-ph)Astronomy and AstrophysicsAccretion (astrophysics)Starsgravitational waves13. Climate actionSpace and Planetary ScienceX-rays : star
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Accretion and Outflow-Related X-Rays in T Tauri Stars

2007

We report on accretion- and outflow-related X-rays from T Tauri stars, based on results from the "XMM-Newton Extended Survey of the Taurus Molecular Cloud." X-rays potentially form in shocks of accretion streams near the stellar surface, although we hypothesize that direct interactions between the streams and magnetic coronae may occur as well. We report on the discovery of a "soft excess" in accreting T Tauri stars supporting these scenarios. We further discuss a new type of X-ray source in jet-driving T Tauri stars. It shows a strongly absorbed coronal component and a very soft, weakly absorbed component probably related to shocks in microjets. The excessive coronal absorption points to d…

Physics010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics01 natural sciencesAccretion (astrophysics)T Tauri starSpace and Planetary Science0103 physical sciencesAstrophysics::Solar and Stellar AstrophysicsOutflowAstrophysics::Earth and Planetary Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics
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