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Time Domain Astrophysics

Stephen Potter South African Astronomical Observatory. Time Domain Astrophysics. Overview. What is Time Domain Astrophysics (Astrotomography)? Variability in Interacting Binaries Cataclysmic Variables Doppler Tomography Roche Tomography Stokes Imaging Eclipse Mapping SALT first Science

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Time Domain Astrophysics

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  1. Stephen Potter South African Astronomical Observatory Time DomainAstrophysics

  2. Overview • What is Time Domain Astrophysics (Astrotomography)? • Variability in Interacting Binaries • Cataclysmic Variables • Doppler Tomography • Roche Tomography • Stokes Imaging • Eclipse Mapping • SALT first Science • High speed CCD photometry 2

  3. Variability in Interacting Binaries • Accretion onto WD in CVs • Porb : minutes – hours • Pspin : tens of seconds • Mass accretion events/ outbursts : months • Magnetic cycles : years – decades • WD/inner disc dominate soft X-ray, UV (SALT strength) • Outer disc emission mostly in optical • Mass donor reveals itself in the red/IR • For X-ray binaries (NS/BH)  keV/MeV emission + • variability as fast as milliseconds 3

  4. Cataclysmic Variables A.P. Beardmore http://www.astro.keele.ac.uk/~apb/OGL_CV/ 4

  5. Magnetic Cataclysmic Variables A.P. Beardmore http://www.astro.keele.ac.uk/~apb/OGL_CV/ 5

  6. Magnetic Cataclysmic Variables 6 A.P. Beardmore http://www.astro.keele.ac.uk/~apb/OGL_CV/

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  8. Doppler Tomography Schwope et al, 1997, A&A, 319, 894 8

  9. Doppler Tomography 9

  10. Roche Tomography 10 Potter, Romero-Colmenero, Watson, Buckley, Phillips 2004, MNRAS, 348, 316

  11. Spectral eclipse mapping 11 Rutten et al. 1993 Nature, 362, 518

  12. Multi-epoch Doppler Tomography 12 Schwope et al. 2000, MNRAS, 313, 533

  13. Spin Doppler Tomography 13

  14. Targets of opportunityDoppler Tomography 14 Steeghs, D., Harlaftis, E.T., Horne, K., 1999, MNRAS, 306, 348

  15. Spectral eclipse mapping 15 Baptista et al. 2000 MNRAS, 314, 727

  16. Stokes imaging Potter et al. 2004, MNRAS, 348,316 16

  17. SALTICAM light curves of SDSS J015543.30+002807.2 17

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