Dr. Seppo J. Laine Profile

Dr. Seppo J. Laine

Research Scientist at Spitzer Science Ctr

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Author

Publications (18)

SPIE Journal Paper | 27 September 2021 Open Access

Warm Spitzer IRAC photometry: dependencies on observing mode and exposure time

Jessica Krick, Patrick Lowrance, Sean Carey, Jason Surace, Carl Grillmair, Seppo Laine, Schuyler Van Dyk, James Ingalls, Matthew L. Ashby, Steven Willner

JATIS, Vol. 7, Issue 03, 038006, (September 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.3.038006

KEYWORDS: Stars, Photometry, Calibration, Signal to noise ratio, Time metrology, Sensors, Infrared telescopes, Space telescopes, Solids, Photons

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Proceedings Article | 24 July 2018 Paper

Spitzer/IRAC precision photometry: a machine learning approach

James Ingalls, Jessica Krick, Sean Carey, Patrick Lowrance, Carl Grillmair, William Glaccum, Seppo Laine, Jonathan Fraine

Proceedings Volume 10698, 106985E (2018) https://doi.org/10.1117/12.2313640

KEYWORDS: Calibration, Machine learning, Data modeling, Photometry, Instrument modeling, Exoplanets, Statistical analysis, Stars, Space telescopes, Statistical modeling

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The largest source of noise in exoplanet and brown dwarf photometric time series made with Spitzer/IRAC is the coupling between intra-pixel gain variations and spacecraft pointing fluctuations. Observers typically correct for this systematic in science data by deriving an instrumental noise model simultaneously with the astrophysical light curve and removing the noise model. Such techniques for self-calibrating Spitzer photometric datasets have been extremely successful, and in many cases enabled near-photon-limited precision on exoplanet transit and eclipse depths. Self-calibration, however, can suffer from certain limitations: (1) temporal astrophysical signals can become aliased as part of the instrument model; (2) for some techniques adequate model estimation often requires a high degree of intra-pixel positional redundancy (multiple samples with nearby centroids) over long time spans; (3) many techniques do not account for sporadic high frequency telescope vibrations that smear out the point spread function. We have begun to build independent general-purpose intra-pixel systematics removal algorithms using three machine learning techniques: K-Nearest Neighbors (with kernel regression), Random Decision Forests, and Artificial Neural Networks. These methods remove many of the limitations of self-calibration: (1) they operate on a dedicated calibration database of approximately one million measurements per IRAC waveband (3.6 and 4.5 microns) of non-variable stars, and thus are independent of the time series science data to be corrected; (2) the database covers a large area of the "Sweet Spot, so the methods do not require positional redundancy in the science data; (3) machine learning techniques in general allow for flexibility in training with multiple, sometimes unorthodox, variables, including those that trace PSF smear. We focus in this report on the K-Nearest Neighbors with Kernel Regression technique. (Additional communications are in preparation describing Decision Forests and Neural Networks.)

Proceedings Article | 10 July 2018 Presentation + Paper

Patrick Lowrance, Jessica Krick, Jim Ingalls, Seppo Laine, Sean Carey, William Glaccum, Joseph Hora, Carl Grillmair

Proceedings Volume 10704, 1070427 (2018) https://doi.org/10.1117/12.2313953

KEYWORDS: Calibration, Space operations, Astronomy, Space telescopes, Solar processes, Photometry, Telescopes, Infrared radiation

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Proceedings Article | 6 July 2018 Paper

Correcting distortions in the infrared array camera during the cryogenic mission of the Spitzer Space Telescope

Carl Grillmair, Patrick Lowrance, Sean Carey, John Stauffer, James Ingalls, Jessica Krick, William Glaccum, Seppo Laine, Roberta Paladini, David Shupe, Schuyler Van Dyk

Proceedings Volume 10698, 106985D (2018) https://doi.org/10.1117/12.2313706

KEYWORDS: Infrared telescopes, Infrared cameras, Space telescopes, Cameras, Infrared imaging

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Proceedings Article | 6 July 2018 Paper

Using the Spitzer IRAC science archive for instrument trending

Jessica Krick, Jim Ingalls, Patrick Lowrance, Sean Carey, Jessie Christiansen, William Glaccum, Carl Grillmair, Seppo Laine

Proceedings Volume 10698, 106985Y (2018) https://doi.org/10.1117/12.2310185

KEYWORDS: Exoplanets, Telescopes, Databases, Clouds, Stars, Photometry, Atmospheric sciences, Space telescopes, Calibration, Data archive systems

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Proceedings Article | 15 July 2016 Paper

Ongoing evolution of proposal reviews in the Spitzer warm mission

Lisa Storrie-Lombardi, Suzanne Dodd, Nancy Silbermann, L. Rebull, Seppo Laine, Megan Crane, John Stauffer, Lee Armus

Proceedings Volume 9910, 991012 (2016) https://doi.org/10.1117/12.2231788

KEYWORDS: Observatories, Gemini Observatory, Fourier transforms, Databases, Head, Telescopes, Software development, Transparency, Visibility, Radium

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Proceedings Article | 21 September 2012 Paper

Absolute photometric calibration of IRAC: lessons learned using nine years of flight data

S. Carey, J. Ingalls, J. Hora, J. Surace, W. Glaccum, P. Lowrance, J. Krick, D. Cole, S. Laine, C. Engelke, S. Price, R. Bohlin, K. Gordon

Proceedings Volume 8442, 84421Z (2012) https://doi.org/10.1117/12.927183

KEYWORDS: Calibration, Stars, Photometry, Cryogenics, Space telescopes, Infrared telescopes, Data modeling, Data centers, Infrared cameras, Infrared radiation

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Proceedings Article | 21 September 2012 Paper

Modifications to the warm Spitzer data reduction pipeline

Patrick Lowrance, Sean Carey, Jessica Krick, Jason Surace, William Glaccum, Iffat Khan, James Ingalls, Seppo Laine, Carl Grillmair

Proceedings Volume 8442, 844238 (2012) https://doi.org/10.1117/12.926944

KEYWORDS: Cryogenics, Calibration, Infrared telescopes, Space telescopes, Stars, Infrared cameras, Infrared imaging, Infrared radiation, Telescopes, Sensors

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Proceedings Article | 21 September 2012 Paper

The IRAC point response function in the warm Spitzer mission

Joseph Hora, Massimo Marengo, Rebecca Park, Denise Wood, William Hoffmann, Patrick Lowrance, Sean Carey, Jason Surace, Jessica Krick, William Glaccum, James Ingalls, Seppo Laine, Giovanni Fazio, Matthew Ashby, Zhong Wang

Proceedings Volume 8442, 844239 (2012) https://doi.org/10.1117/12.926894

KEYWORDS: Stars, Cryogenics, Space telescopes, Point spread functions, Sensors, Telescopes, Infrared cameras, Photometry, Infrared telescopes, Diffraction

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Proceedings Article | 21 September 2012 Paper

Intra-pixel gain variations and high-precision photometry with the Infrared Array Camera (IRAC)

James Ingalls, Jessica Krick, Sean Carey, Seppo Laine, Jason Surace, William Glaccum, Carl Grillmair, Patrick Lowrance

Proceedings Volume 8442, 84421Y (2012) https://doi.org/10.1117/12.926947

KEYWORDS: Calibration, Stars, Photometry, Infrared cameras, Infrared telescopes, Infrared radiation, Interference (communication), Space telescopes, Exoplanets, Planetary systems

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Proceedings Article | 13 September 2012 Paper

Pointing effects and their consequences for Spitzer IRAC exoplanet observations

Carl Grillmair, Sean Carey, John Stauffer, Mark Fisher, Ryan Olds, James Ingalls, Jessica Krick, William Glaccum, Seppo Laine, Patrick Lowrance, Jason Surace

Proceedings Volume 8448, 84481I (2012) https://doi.org/10.1117/12.927191

KEYWORDS: Space telescopes, Exoplanets, Telescopes, Space operations, Stars, Sensors, Photometry, Phase measurement, Aberration correction, Calibration

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Proceedings Article | 5 August 2010 Paper

Calibration and data quality of warm IRAC

S. Carey, J. Surace, W. Glaccum, J. Ingalls, J. Krick, M. Lacy, P. Lowrance, S. Laine, J. O'Linger, J. Stauffer, S. Willner, J. Hora, W. Hoffmann, M. L. N. Ashby, J.-S. Huang, M. Marengo, M. Pahre, Z. Wang, M. Werner, G. Fazio

Proceedings Volume 7731, 77310N (2010) https://doi.org/10.1117/12.857788

KEYWORDS: Cryogenics, Calibration, Photometry, Infrared telescopes, Space telescopes, Stars, Sensors, Signal to noise ratio, Exoplanets, Multiplexers

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Proceedings Article | 12 July 2008 Paper

Proposal review rankings: the influence of reviewer discussions on proposal selection

Lisa Storrie-Lombardi, Nancy Silbermann, Luisa Rebull, Seppo Laine, Megan Crane

Proceedings Volume 7016, 701622 (2008) https://doi.org/10.1117/12.787964

KEYWORDS: Observatories, Cryogenics, Space telescopes, Telescopes, Astronomy, Solar system, Astronomical telescopes, Hubble Space Telescope, Stars, X-ray telescopes

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Proceedings Article | 30 June 2006 Paper

Spitzer Space Telescope proposal process

S. Laine, N. Silbermann, L. Rebull, L. Storrie-Lombardi

Proceedings Volume 6270, 627029 (2006) https://doi.org/10.1117/12.669087

KEYWORDS: Space telescopes, Databases, Visualization, Observatories, Astronomy, Printing, Infrared cameras, Infrared imaging, Infrared spectroscopy, Internet

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Proceedings Article | 12 October 2004 Paper

Comparison of laboratory and in-flight performance of infared array camera (IRAC) detector arrays on Spitzer Space Telescope

Judith Pipher, Craig McMurtry, William Forrest, Craig McCreight, Mark McKelvey, Robert McMurray, Roy Johnson, Giovanni Fazio, Joseph Hora, Lori Allen, Matthew Ashby, Pauline Barmby, Lynne Deutsch, Jiasheng Huang, Massimo Marengo, S. Thomas Megeath, Michael Pahre, Brian Patten, Zhong Wang, Steven Willner, William Hoffmann, Samuel Moseley, Richard Arendt, Danny Krebs, Peter Eisenhardt, Daniel Stern, Varoujan Gorjian, Bidushi Bhattacharya, William Glaccum, Mark Lacy, Patrick Lowrance, Sean Carey, Seppo Laine, John Stauffer, Jason Surace, William Reach, Gillian Wilson

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551599

KEYWORDS: Sensors, Multiplexers, Detector arrays, Quantum efficiency, Space telescopes, Cameras, Infrared telescopes, Infrared cameras, Calibration, Infrared radiation

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Proceedings Article | 12 October 2004 Paper

Observing with the infrared array camera (IRAC) on the Spitzer Space Telescope

Sean Carey, Mark Lacy, Seppo Laine, William Reach, Jason Surace, William Glaccum, Joseph Hora, Steven Willner, Richard Arendt, Matthew Ashby, Lori Allen, Pauline Barmby, Bidushi Bhattacharya, Lynne Deutsch, Peter Eisenhardt, William Hoffmann, Jiasheng Huang, Patrick Lowrance, Massimo Marengo, S. Thomas Megeath, Brant Nelson, Michael Pahre, Brian Patten, Judith Pipher, John Stauffer, Daniel Stern, Zhong Wang, Gillian Wilson, Giovanni Fazio

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.550968

KEYWORDS: Calibration, Infrared telescopes, High dynamic range imaging, Space telescopes, Stray light, Infrared cameras, Stars, Infrared radiation, Space operations, Telescopes

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Proceedings Article | 12 October 2004 Paper

In-flight performance and calibration of the Infrared Array Camera (IRAC) for the Spitzer Space Telescope

Joseph Hora, Giovanni Fazio, Lori Allen, Matthew Ashby, Pauline Barmby, Lynne Deutsch, Jiasheng Huang, Massimo Marengo, S. Megeath, Gary Melnick, Michael Pahre, Brian Patten, Howard Smith, Zhong Wang, Steven Willner, William Hoffmann, Judith Pipher, William Forrest, Craig McMurtry, Craig McCreight, Mark McKelvey, Robert McMurray, Samuel Moseley, Richard Arendt, John Mentzell, Catherine Marx, Dale Fixsen, Eric Tollestrup, Peter Eisenhardt, Daniel Stern, Varoujan Gorjian, Bidushi Bhattacharya, Sean Carey, William Glaccum, Mark Lacy, Patrick Lowrance, Seppo Laine, Brant Nelson, William Reach, John Stauffer, Jason Surace, Gillian Wilson, Edward Wright

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.550744

KEYWORDS: Stars, Calibration, Light scattering, Sensors, Stray light, Infrared telescopes, Point spread functions, Cameras, Space telescopes, Infrared cameras

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Proceedings Article | 29 September 1995 Paper

Sun-synchronous orbit mission for passively cooled reconnaissance of the interstellar medium

Jonathan Campbell, John Fikes, Mark Gerry, Jim McCarter, Harold Blevins, William Jones, Donald Williams, Holly Chandler, Allen Green, Terry Schmitt, Linda Vestal, Belinda Wright, John Jackson, R. Greg Schunk, Ken Swaim, Susan Spencer, Charles Telesco, Seppo Laine, Timothy Hawarden, Charles Taylor, Russell Chipman, Richard Parmley

Proceedings Volume 2553, (1995) https://doi.org/10.1117/12.221356

KEYWORDS: Space operations, Space telescopes, Telescopes, Sensors, Prisms, Sun, Mirrors, Spectroscopy, Spectrographs, Clouds

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Showing 5 of 18 publications

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