The extraordinary polarimetric nature of the white dwarf ... fileAR Sco Marsh et al, Nature, 2016...
Transcript of The extraordinary polarimetric nature of the white dwarf ... fileAR Sco Marsh et al, Nature, 2016...
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The extraordinary polarimetric nature of the white dwarf pulsar AR Sco
Stephen PotterDavid Buckley
South African Astronomical Observatory
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AR ScoMarsh et al, Nature, 2016 white dwarf radio pulsar with a M-dwarf secondary 3.56hr orbit 117s,118s, modulations from radio to UV measured WD spin down powers the non-thermal emission SED – synchrotron emission - Optical, Radio
David Buckley and myself in March 2016 with HIPPO discovered optically pulsed polarized emission
GOALS:
Detailed polarimetry covering multiple orbits in 2016 and 2017
Present a Geometrical model
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AR ScoMarsh et al, Nature, 2016 white dwarf radio pulsar with a M-dwarf secondary 3.56hr orbit 117s,118s, modulations from radio to UV measured WD spin down powers the non-thermal emission SED – synchrotron emission - Optical, Radio
David Buckley and myself in March 2016 with HIPPO discovered optically pulsed polarized emission
GOALS:
Detailed polarimetry covering multiple orbits in 2016 and 2017
Present a Geometrical model
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Beat FoldedSpin Folded
Position Angle
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WD
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WD
0
Inte
nsity
1WD spin phase
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WD
0
Inte
nsity
1WD spin phase
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WD
0
Inte
nsity
1WD spin phase
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WD
0
Inte
nsity
1WD spin phase
Model
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Model Observations
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Model Observations
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Model Observations
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Thank you