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Debris Disk Detection around Nearby Stars

Debris Disk Detection around Nearby Stars. Elizabeth Gehret Mentor : Dr . David Koerner Northern Arizona University. Introduction. Working with Dr. David Koerner at NAU Analyzing photometry from a sample of nearby stars Excess infrared emission indicates dust around a star.

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Debris Disk Detection around Nearby Stars

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  1. Debris Disk Detection around Nearby Stars Elizabeth Gehret Mentor: Dr. David Koerner Northern Arizona University

  2. Introduction • Working with Dr. David Koerner at NAU • Analyzing photometry from a sample of nearby stars • Excess infrared emission indicates dust around a star

  3. Why do we care? • Stars with debris disks are indicators of planetary systems • Correlation between stellar properties and debris disks

  4. Data • Data taken from Spitzer Space Telescope • 24μm and 70μm • Wide-field Infrared Survey Explorer (WISE) • 3.4μm, 4.6μm, 12μm, 22μm • Ground-based optical and near-infrared (BVK) photometry • .445μm, .551μm, 2.19μm

  5. Analysis • Spitzer data taken from an NAU survey of 978 stars • WISE data and BVK photometry taken from online databases • IRSA, SIMBAD, VISIER

  6. Analysis • WISE 1 used as photosphericestimation • Subtracted off longer wavelength bands to look for excess emission

  7. Analysis • Photospheric uncertainty flipped to find σ

  8. Results • Stars 3σ or greater above photospheric emission compiled in a list of debris disk candidates • Preliminary results • 146 stars at 24μm • 193 stars at 70μm

  9. Remaining Work • Saturation of WISE data (brightest stars) • Misidentification of WISE targets • Small % of objects w/these issues--need to be fixed before results can be finalized

  10. Thank you! • Dr. Koerner • Nadine Barlow & Kathleen Stigmon • NASA’s Space Grant program • Arizona Space Grant Consortium

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