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2017-08-11
Shared space to suggest or develop ideas for new OpSIM experiments, to help maximize LSST’s scientific utility for the Minisurveys and Deep Drilling Fields. Suggestions are loosely organized by topic, to help identify common features in suggested modifications.
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For the template:http://ls.st/smgStrategy criteriaAny other notes or specifications
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#NameBroad categoryProposer(s)"Proposed Changes""Science Motivation"Sky regionFilter distributionTotal number of exposuresExposure timesMJD distributionNotes1Notes2 / predictions
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1Bimodal Seeing towards crowded regionsStatic scienceWill ClarksonAllocate a few very-good seeing observations every three years, the remainder can be at "moderate" to "good" seeingFor crowded field photometry, a few observations at excellent seeing push the confusion limit to fainter magnitudes, as they allow forced photometry using the sharpest images as a template (e.g. Olsen, Blum & Rigaut 2008). For astrometry, taking a few excellent-seeing observations over the full time baseline should recover much of the proper motion precision that would otherwise require excellent seeing for all observations.GP and SCP regionsUniform across all filtersAs wide-fast-deep2x15sUniformly spread over the full 10-year survey lifetime
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2Uniformly good seeing towards crowded regionsStatic scienceWill ClarksonAllocate observations towards crowded regions, of uniformly very-good seeing (0.7 arcseconds or better).Provide a benchmark against which to compare strategies with poorer seeing. GP and SCP regionsUniform across all filtersAs wide-fast-deep2x15sUniformly spread over the full 10-year survey lifetimeProvides an "ideal world" benchmark for photometry and astrometry in crowded regions.Prediction: will be the most expensive of the "seeing" proposals in terms of impact on other strategies.
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3Allocate best seeing crowded regions in first yearStatic scienceWill ClarksonRestrict observations towards Galactic Plane and SCP minisurveys to seeing better than 0.7" within the first two years of the survey, relaxed to better than 1.2" for the remainder of the surveyExamine the impact on astrometry and photometry of using the first year to provide a best-seeing templateGP and SCP regionsUniform across all filtersAs wide-fast-deep2x15sUniformly spread over the full 10-year survey lifetimeLike "bimodal seeing" but with all the good seeing in the first year.Prediction: just as good for photometry as strategy 1, but worse for astrometry
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4Slow-variability monitoring in the PlaneVariable Stars and TransientsAny takers?Re-allocate most of the observations in {u,g,i,z,y} to r-band monitoring, for the GP and SCP mini-surveysMany classes of transient require monitoring in the same filter to robustly detect transitions from quiescent level (examples: microlensing, soft X-ray transients). GP and SCP regions10 each in {u,g,i,z,y}, 130 in r1802x15sUniformly spread over the full 10-year survey lifetimeImprove monitoring for variables while allowing static photometry down to the confusion limit in all fieldsThe CrowdingMetric will check whether this really does allow confusion-limited photometry in crowded regions.
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