projtran - UCF Physics: AST 4762: Astronomical Data...

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UCF Physics: AST 4762: Astronomical Data Analysis Fall 2009 Final Project Exoplanetary Transit Measure the radius of an exoplanet. You will measure data from Spitzer Space Telescope program 30825, a transit of planet HD 189733b at 8 μ m observed by Prof. David Charbonneau and his graduate student, Heather Knutson, of Harvard University. You will search for bad pixels and perform photometry on the pre-processed data frames provided by the Spitzer Science Center. These frames are already flat-fielded, debiased, darkened, etc. You will measure the transit depth from the resulting lightcurve by finding the ratio of in- and out-of-eclipse data. Finally, you will calculate a radius for the planet by scaling the stellar radius. 1. Learn about the planet. Get and read the discovery paper and at least one other paper on it (the paper written for this dataset is a good one to choose). It will likely help to read one or more of Charbonneau et al. (2005) or Harrington et al. (2007), including the latter’s supplementary information. These discuss InfraRed Array Camera (IRAC) systematics, but not this dataset. 2. Familiarize yourself with the data in /home/ast5765/data/transit . Locate the IRAC Data Handbook online and skim it. Identify the science frames, the uncertainty frames, the raw frames, etc. Note that we will only be using the science frames, the Basic Calibrated Data ( _bcd.fits ). Figure out the naming scheme for files. That this dataset was taken in IRAC subarray mode, which takes 64 quick exposures and stacks them in a series of 3D data cubes, one cube per file. The directory does not contain all the files in the dataset, but only the BCD files from the time near transit. It does include a directory called fullset containing one full set of files so you can see what professional astronomers get when they download data. One can also download the raw data, of course. These are just the results of processing. 3. Start your Python script with a section of variable and function definitions. Put whatever constant and function definitions you will need here as you encounter them below. Functions may be defined either here or in separate files, but need to be documented in either place. Define variables you will use to index the frame parameters array, so that you never index
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This note was uploaded on 11/09/2009 for the course AST 4762 taught by Professor Harrington during the Fall '09 term at University of Central Florida.

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projtran - UCF Physics: AST 4762: Astronomical Data...

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