X-Ray Flare Oscillations Track Plasma Sloshing along Star-disk Magnetic Tubes in the Orion Star-forming Region

Fabio Reale, Ettore Flaccomio, Antonino Petralia, Salvatore Sciortino, Fabio Reale, Javier Lopez-Santiago

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

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 ones typically involve arcades of closed magnetic tubes. Long-lasting X-ray flares are observed in PMS stars. Large-amplitude (∼20%), long-period (∼3 hr) pulsations are detected in the light curve of day-long flares observed by the Advanced CCD Imaging Spectrometer 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 hr) heat pulse. These magnetic tubes are ≥20 solar radii long, enough to connect the star with the surrounding disk.
Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalTHE ASTROPHYSICAL JOURNAL
Volume856
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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