Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/855

A search for debris disks with a dual channel adaptive optics imaging polarimeter

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dc.contributor.advisor Jewitt, David
dc.contributor.author Potter, Daniel Edward
dc.date.accessioned 2008-03-19T05:13:00Z
dc.date.available 2008-03-19T05:13:00Z
dc.date.issued 2003-05
dc.identifier.citation Potter, Daniel Edward (2003) A search for debris disks with a dual channel adaptive optics imaging polarimeter. Ph.D. dissertation, University of Hawai'i, United States -- Hawaii.
dc.identifier.uri http://hdl.handle.net/10125/855
dc.description.abstract A dual channel polarimeter was incorporated into the Hokupa'a adaptive optics system mounted on the Gemini North telescope to enhance sensitivity to detecting the light scattered by circumstellar material. The technique suppressed noise introduced by non-repeatable variations of the point spread function which limit the sensitivity of non-simultaneous adaptive optics imaging. Polarimetric images of the classical T-Tauri star environments around GG Tauri Aab, TW Hydrae, LkCa 15, LkHα 242, GM Aurigae, and SR24 N/S were observed to establish the instrument's sensitivity. A survey of nearby ( d < 25 pc), young ( age < 1 Gyr), solar-analog stars was undertaken with the polarimeter to search for collisionally active debris disks analogous to our young solar system. Of the 24 stars sampled, none were found to have obvious scattered light signatures. Isotropic and Mie scattering model images of debris disks were used to constrain the amount of material around the survey stars to no more than M dust ∼ 10 -2 M Moon of 1-10μ m sized dust contained between 5-50 AU from the sample stars. Particle lifetimes under the influence of the Poynting Robertson Drag, radiation pressure, and solar wind drag are calculated as a function of central star spectral type. The corpuscular drag from stellar winds shorten dust lifetimes by an amount inversely proportional to the stellar wind mass-loss rate. This translates into dust lifetimes 100-1000 times shorter around young solar analog stars compared to the present day. This effect, cam significantly reduce the near-IR detectability of debris disks around these chromospherically active stars.
dc.language.iso en-US
dc.publisher University of Hawaii at Manoa
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Astronomy; no. 4311
dc.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
dc.rights.uri https://scholarspace.manoa.hawaii.edu/handle/10125/772
dc.subject Debris disks
dc.subject Adaptive optics imaging
dc.subject Polarimeter
dc.subject High-contrast imaging
dc.subject Astronomy
dc.subject Astrophysics
dc.subject Optics
dc.title A search for debris disks with a dual channel adaptive optics imaging polarimeter
dc.type Thesis
dc.type.dcmi Text
dc.contributor.department Astronomy
dc.date.graduated 2003-05
local.identifier.callnumber AC1 .H3 no. 4311
local.thesis.degreelevel PhD
Appears in Collections: Ph.D. - Astronomy


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