John H. Debes, Alycia J. Weinberger, Glenn Schneider
We combine HST NICMOS imaging photometry of the HR 4796A disk at previously unobserved wavelengths between 1.71–2.22 mm with reprocessed archival observations to produce a measure of the dust’s...
Digging for substellar objects in the stellar graveyard (2005)
Thesis (Ph.D.)--Pennsylvania State University, 2005.
Digging for substellar objects in the stellar graveyard [electronic resource] / (2005)
The full text of the dissertation is available as a Adobe Acrobat .pdf file (128 p.) ; Adobe Acrobat Reader required to view the file.
Finding Extrasolar Planets in the Stellar Graveyard with the Hubble Space Telescope (2004)
Debes, John H., Sigurdsson, Steinn, Woodgate, Bruce E.
In order to directly image an extrasolar planet, the large contrast between a star and a companion planet must be overcome. White Dwarfs (WDs) are the remnants of stars > 1 M_sun and are orders of...
High Contrast Imaging of Extrasolar Planets (2003)
Gaussian aperture pupil masks (GAPMs) can in theory achieve the contrast requisite for directly imaging an extrasolar planet. We use lab tests and simulations to further study their possible place as...
Are There Unstable Planetary Systems Around White Dwarfs? (2002)
Debes, John H., Sigurdsson, Steinn
The presence of planets around solar-type stars suggests that many white dwarfs should have relic planetary systems. While planets closer than $\sim$ 5~AU will most likely not survive the post-main...