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Coronagraphic Spectroscopy: Spatially Resolved Spectroscopy with HST STIS

Coronagraphic Spectroscopy: Spatially Resolved Spectroscopy with HST STIS. Jessica Donaldson. Circumstellar Disks. Roberge et al. (2005). TW Hydrae. Circumstellar Disks. Roberge et al. (2005). TW Hydrae. Debris Disks. Fainter – target edge-on to get more signal

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Coronagraphic Spectroscopy: Spatially Resolved Spectroscopy with HST STIS

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  1. Coronagraphic Spectroscopy:Spatially Resolved Spectroscopy with HST STIS Jessica Donaldson

  2. Circumstellar Disks Roberge et al. (2005) TW Hydrae

  3. Circumstellar Disks Roberge et al. (2005) TW Hydrae

  4. Debris Disks • Fainter – target edge-on to get more signal • Targeted 3 bright, edge-on debris disks • HD32297, AU Mic, HR4796A • Is there a change in color with disk radius? • A few debris disks have been targeted with spectrophotometry • HR4796A shows red color in near-IR (Debes et al. 2009) AU Microscopii (Krist et al. 2005)

  5. Coronagraphic Spectroscopy • Scattered light • 52x0.2F2 Aperture • G430L and G750L • Edge-on Debris disk • Slit placed along the length of the disk • Fiducial bar blocks the bright central star

  6. Coronagraphic Spectroscopy Fiducial bar Radius Wavelength

  7. Observations 1) Target – HD32297 PSF reference star 2) Unocculted

  8. Observations 3) Scale and subtract Scattered light from disk only

  9. Observations • Acquisition peak-up • Center star behind the fiducial bar • In wavelength-direction (x-direction) • Contemporaneous lamp flat • For defringing G750L data • Unocculted spectrum • Target and PSF reference star • Occulted spectrum • Target and PSF reference star

  10. Data Reduction • Unsupported mode • We reduced the data ourselves including defringing and wavelength calibration • Started with crj files • Basic data reduction already done including bias and dark subtraction, flat-fielding, and cosmic-ray rejection • Combined multiple orbits before data reduction

  11. Defringing

  12. Calibration • STSDAS IRAF tasks wavecal, x1d, x2d • Convert flux to cgs units • Correct geometrical distortion

  13. Calibration • STSDAS IRAF tasks wavecal, x1d, x2d • Convert flux to cgs units • Correct geometrical distortion

  14. Sigma Clipping

  15. PSF Subtraction

  16. Radial Profile – HD32297

  17. Binned Spectra – HD32297

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