6533b7defe1ef96bd127673d
RESEARCH PRODUCT
X-ray flare oscillations track plasma sloshing along star-disk magnetic tubes in Orion star-forming region
Fabio RealeFabio RealeJavier López-santiagoEttore FlaccomioA. PetraliaSalvatore Sciortinosubject
010504 meteorology & atmospheric sciencesSlosh dynamicsAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsStar (graph theory)01 natural scienceslaw.inventionlaw0103 physical sciencesAstrophysics::Solar and Stellar AstrophysicsX-rays: star010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsSolar and Stellar Astrophysics (astro-ph.SR)0105 earth and related environmental sciencesstars: coronaePhysicsstars: formationTrack (disk drive)X-rayAstronomy and AstrophysicsPlasmaAstronomy and AstrophysicAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary SciencePhysics::Space Physicsstars: flareAstrophysics::Earth and Planetary AstrophysicsFlaredescription
Pulsing X-ray emission tracks the plasma echo traveling in an extremely long magnetic tube that flares in an Orion Pre-Main Sequence (PMS) star. On the Sun, flares last from minutes to a few hours and the longest-lasting typically involve arcades of closed magnetic tubes. Long-lasting X-ray flares are observed in PMS stars. Large-amplitude (~20%) long-period (~3 hours) pulsations are detected in the light curve of day-long flares observed by the Advanced CCD Imaging Spectrometer (ACIS) on-board Chandra from PMS stars in the Orion cluster. Detailed hydrodynamic modeling of two flares observed on V772 Ori and OW Ori shows that these pulsations may track the sloshing of plasma along a single long magnetic tube, triggered by a sufficiently short (~1 hour) heat pulse. This magnetic tubes are as long (>= 20 solar radii) as to connect the star with the surrounding disk.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-02-14 |