CfAI Seminar: Airglow and sky-subtraction in the ELT era, with Jay Stephan of UKATC, and High Angular Resolution in Complex Media : Dealing with Aberrations and Scattering with Serge Meimon of Onera.
WEDNESDAY 26 FEBRUARY - Speakers are Jay Stephan of UKATC and Serge Meimon of Onera. Their seminars are titled 'Airglow and sky-subtraction in the ELT era' and 'High Angular Resolution in Complex Media : Dealing with Aberrations and Scattering'
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Wednesday 26th February OCW017 1pm
Speaker: Jay Stephan, UKATC
Title: Airglow and sky-subtraction in the ELT era
Abstract: Airglow is the emission of light from chemical reactions in the upper atmosphere. This light is imprinted on all ground-based observations and needs to be carefully removed with ‘sky-subtraction’ to retrieve accurate science data. However, airglow is complex and poorly characterised – mainly faint lines are uncatalogued, and questions exist over its temporal and spatial variation. In this talk I will discuss how preparations are being made to enable accurate sky-subtraction for ESO’s upcoming 39m Extremely Large Telescope (ELT), required to unlock the telescope’s full science potential and immense sensitivity. I will discuss our understanding of airglow; the techniques used in sky-subtraction for upcoming multi-object spectrographs; and the research that is being carried out in characterising airglow (which includes pointing an 8m telescope at zenith for 39 hours).
Speaker: Serge Meimon, Onera
Title: High Angular Resolution in Complex Media : Dealing with Aberrations and Scattering"
Abstract: Aberrations and scattering are typically treated separately: we correct for turbulence-induced aberrations, while scattering is often considered either as transmission loss or a source of background noise. In this talk, I will highlight the common origin of both phenomena, present cases where scattered light can be leveraged to enhance contrast, and finally, discuss the possibility of correcting scattering in a manner similar to how aberrations are traditionally corrected.
WEDNESDAY 12 MARCH - Speaker is Dmitry Morozov (University of Glasgow). Title is TBC.
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Speaker is Dmitry Morozov (University of Glasgow). Title is TBC.
WEDNESDAY 23 APRIL - Speaker is Peter Wizinowich (KECK). Title is TBC.
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Speaker is Peter Wizinowich (KECK). Title is TBC.
WEDNESDAY 7 MAY - Speaker is Ellen Schallig (University of Oxford). The seminar is titled 'Knitting together the WEAVE Large IFU'.
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Speaker is Ellen Schallig (University of Oxford). The seminar is titled 'Knitting together the WEAVE Large IFU'.
WEDNESDAY 21 MAY - Speaker is Doug McDonald (Fraunhofer IOSB). Title is TBC.
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Speaker is Doug McDonald (Fraunhofer IOSB). Title is TBC.