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Data · dataset · 2026

Simulated spectropolarimetry of accretion disc winds

Listed in ZivaHub and Deakin Research Online and DMU Figshare — shown once because both records carry DOI 10.17034/32640561.v1

<p>Accretion powers the most luminous systems across the Universe, from close Cataclysmic Variable (CV) stars to distant quasars.

Description

Ubiquitous accretion disc winds (ADW), imprint spectral signatures of broad, blue-shifted absorption lines across the emitted continuum from accreting objects. These mass loaded outflows may modify their surroundings, offering a unique window into these dynamic accreting environments.

Polarization may help to reveal the geometry and kinematics of asymmetric winds and spectropolarimetry could help us to unify these fascinating systems.</p> <p> </p><p>In this thesis, we implement polarization for the first time in the Monte Carlo radiative transfer (MCRT) code, Python, to create simulated spectropolarimetry of biconical disc wind models. We explore spectropolarimetry results for a fiducial CV ADW and an enhanced model for optical wavelengths.

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We investigate how scattering varies across ADW spectral signatures, and we vary physical parameters, wind velocity laws and clumping. Our results are qualitatively similar to observations of a Nova-like CV suggesting that spectropolarimetry of ADW can help constrain CV parameters.</p><p> </p><p> </p><p>We applied our techniques to Broad Absorption Line Quasi Stellar Object (BALQSO) wind models and we investigated polarization across UV resonance lines and optical wind signatures.

Polarization levels in our simulations qualitatively match observations. </p> <p> </p><p>Our work suggests that spectropolarimetry is a powerful tool to probe ADW, revealing more about the underlying accretion continuum and how the wind kinematics and geometry may provide additional independent evidence to the spectrum from accreting objects. Thereby, enhancing knowledge about their driving mechanisms, mass-loss rates and ionization structure: highly important goals for the astronomical community.</p><br><i>Thesis is embargoed until 31st December 2029</i>.<br>

Links

Where it is published

Catalogue records · 1

Topics

Provenance · 3 source records, 11 field assertions
SourceKeyLast seenRaw
ZivaHuboai:figshare.com:article/326405615 d agoJSON v1
Deakin Research Onlineoai:figshare.com:article/326405615 d agoJSON v1
DMU Figshareoai:figshare.com:article/326405615 d agoJSON v1
FieldAssertionExtractorEvidence
access_levelsource · zivahub uct ac zaconnector:zivahub_uct_ac_za@1.0.0
concepts[field].local:field:earth-environmentalmapping · figshare dmu ac ukconnector:figshare_dmu_ac_uk@1.0.0
concepts[field].local:field:earth-environmentalmapping · dro deakin edu auconnector:dro_deakin_edu_au@1.0.0
concepts[field].local:field:earth-environmentalmapping · zivahub uct ac zaconnector:zivahub_uct_ac_za@1.0.0
concepts[method].local:method:simulationmapping · figshare dmu ac ukvocabulary-mapper@1.0.0keywords['numerical simulation']
concepts[method].local:method:simulationmapping · zivahub uct ac zavocabulary-mapper@1.0.0keywords['numerical simulation']
concepts[method].local:method:simulationmapping · dro deakin edu auvocabulary-mapper@1.0.0keywords['numerical simulation']
descriptionsource · zivahub uct ac zaconnector:zivahub_uct_ac_za@1.0.0/metadata/dc/description
license_textsource · zivahub uct ac zaconnector:zivahub_uct_ac_za@1.0.0
publication_datesource · zivahub uct ac zaconnector:zivahub_uct_ac_za@1.0.0
titlesource · zivahub uct ac zaconnector:zivahub_uct_ac_za@1.0.0/metadata/dc/title