Lowrance, Patrick J. and Carey, Sean J. and Ingalls, James G. and Surace, Jason and Capak, Peter and Stauffer, John and Beichman, Chas and Shupe, David and Kirkpatrick, J. Davy (2014) Enhancement of the Spitzer Infrared Array Camera Distortion Correction for Parallax Measurements. In: Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.9143. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 914358. ISBN 978-0-8194-9611-9 http://resolver.caltech.edu/CaltechAUTHORS:20150619-102503782
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The Spitzer Space Telescope Infrared Array (IRAC) offers a rare opportunity to measure distances and determine physical properties of the faintest and coldest brown dwarfs. The current distortion correction is a 3rd order polynomial represented by TAN-SIP parameters within the headers. The current correction, good to 100 mas, was derived from deep imaging, using marginally resolved galaxies in some cases, and has remained stable throughout both the cryogenic and warm mission. Using recent Spitzer calibration observations mapped to HST/ACS calibration observations of 47 Tuc with an absolute accuracy good to 1 mas, we are working towards a possible 5th order polynomial correction that theoretically could allow measurements to within 20 mas. Extensive testing, using observations of 47 Tuc, NGC 6791 and NGC 2264, are underway, after which the new parameters will be used to update all the 3.6 and 4.5um data taken within warm and cryogenic missions. We anticipate if achievable, this new accuracy could be combined with other ongoing enhancements (Ingalls et al, 9143-52) that will permit measurements of parallaxes out to about 50 pc, increasing the volume surveyed by a factor of 100, and enabling new capabilities such as luminosity measurements of the population of young brown dwarfs in the beta Pictoris moving group.
|Item Type:||Book Section|
|Additional Information:||© 2014 SPIE.|
|Group:||COSMOS, Infrared Processing and Analysis Center (IPAC)|
|Subject Keywords:||infrared; distortion; calibrations; parallax; brown dwarfs|
|Official Citation:||Patrick J. Lowrance ; Sean J. Carey ; James G. Ingalls ; Jason A. Surace ; Peter Capak ; John Stauffer ; Chas Beichman ; David Shupe ; J. Davy Kirkpatrick; Enhancement of the Spitzer Infrared Array Camera (IRAC) distortion correction for parallax measurements. Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 914358 (August 2, 2014); doi:10.1117/12.2057195|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||19 Jun 2015 17:38|
|Last Modified:||01 Mar 2017 18:41|
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