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SUMMARY:Recovering sky brightness with interferometry: A Fourier domain\, 
 Gaussian process approach - Jeff Jennings
DTSTART:20191120T134500Z
DTEND:20191120T141500Z
UID:TALK130390@talks.cam.ac.uk
CONTACT:Catrina Diener
DESCRIPTION:Interferometric observations from the radio to infrared and op
 tical are faced with a common challenge: recovering a source’s on-sky br
 ightness from sparsely sampled Fourier data. This is often approached as a
 n image reconstruction problem. In sub-mm observations of protoplanetary d
 iscs for example\, the most common modeling technique\, ‘CLEAN\,’ oper
 ates in the image plane\, precluding a full exploitation of the observatio
 ns’ frequency information. This in turn places a fundamental limit on th
 e model’s accuracy. In this talk I will reframe the problem as a spatial
  frequency domain analysis\, presenting our open source code that fits the
  interferometric data directly in the Fourier domain with a high resolutio
 n\, nonparametric and fast Gaussian process. The technique is currently ta
 ilored to (sub-)mm observations of protoplanetary discs\, using 1D fits to
  assess these typically symmetric objects. With synthetic and real observa
 tions I will motivate how these fits are recovering disc structures beyond
  the CLEAN imaging resolution ( ‘sub-beam’ ) in both low and high reso
 lution datasets. Noting scientific applications of our model in the protop
 lanetary disc context\, I will then conclude by outlining the code’s pla
 nned extensions and potential utility in other physical and frequency regi
 mes.
LOCATION:Sackler Lecture Theatre\, IoA
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