A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations
September 3, 2010
| Главные авторы: | , , , , , , , , |
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| Другие авторы: | |
| Формат: | Статья |
| Язык: | en_US |
| Опубликовано: |
University of Chicago Press, The
2012
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| Online-ссылка: | http://hdl.handle.net/1721.1/74046 https://orcid.org/0000-0002-6892-6948 |
| _version_ | 1826214176827113472 |
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| author | Ballard, Sarah Charbonneau, David Deming, Drake Knutson, Heather A. Christiansen, Jessie L. Holman, Matthew J. Fabrycky, Daniel C. Seager, Sara A'Hearn, Michael F. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Ballard, Sarah Charbonneau, David Deming, Drake Knutson, Heather A. Christiansen, Jessie L. Holman, Matthew J. Fabrycky, Daniel C. Seager, Sara A'Hearn, Michael F. |
| author_sort | Ballard, Sarah |
| collection | MIT |
| description | September 3, 2010 |
| first_indexed | 2024-09-23T16:01:18Z |
| format | Article |
| id | mit-1721.1/74046 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:01:18Z |
| publishDate | 2012 |
| publisher | University of Chicago Press, The |
| record_format | dspace |
| spelling | mit-1721.1/740462022-10-02T05:45:05Z A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations Ballard, Sarah Charbonneau, David Deming, Drake Knutson, Heather A. Christiansen, Jessie L. Holman, Matthew J. Fabrycky, Daniel C. Seager, Sara A'Hearn, Michael F. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Seager, Sara September 3, 2010 We discovered evidence for a possible additional 0.75 transiting planet in the NASA EPOXI observations of the known M dwarf exoplanetary system GJ 436. Based on an ephemeris determined from the EPOXI data, we predicted a transit event in an extant Spitzer Space Telescope 8 μm data set of this star. Our subsequent analysis of those Spitzer data confirmed the signal of the predicted depth and at the predicted time, but we found that the transit depth was dependent on the aperture used to perform the photometry. Based on these suggestive findings, we gathered new warm Spitzer observations of GJ 436 at 4.5 μm spanning a time of transit predicted from the EPOXI and Spitzer 8 μm candidate events. The 4.5 μm data permit us to rule out a transit at high confidence, and we conclude that the earlier candidate transit signals resulted from correlated noise in the EPOXI and Spitzer 8 μm observations. In the course of this investigation, we developed a novel method for correcting the intrapixel sensitivity variations of the 3.6 and 4.5 μm channels of the Infrared Array Camera (IRAC) instrument. We demonstrate the sensitivity of warm Spitzer observations of M dwarfs to confirm sub-Earth-sized planets. Our analysis will inform similar work that will be undertaken to use warm Spitzer observations to confirm rocky planets discovered by the Kepler mission. 2012-10-17T18:01:59Z 2012-10-17T18:01:59Z 2010-10 2010-08 Article http://purl.org/eprint/type/JournalArticle 0004-6280 1538-3873 http://hdl.handle.net/1721.1/74046 Miller, R E et al. “Soluble Protein Concentrate from Alfalfa by Low-temperature Acid Precipitation.” Journal of agricultural and food chemistry 23.6 (1975): 1177–1179. https://orcid.org/0000-0002-6892-6948 en_US http://dx.doi.org/10.1086/657159 Publications of the Astronomical Society of the Pacific Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf University of Chicago Press, The arXiv |
| spellingShingle | Ballard, Sarah Charbonneau, David Deming, Drake Knutson, Heather A. Christiansen, Jessie L. Holman, Matthew J. Fabrycky, Daniel C. Seager, Sara A'Hearn, Michael F. A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations |
| title | A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations |
| title_full | A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations |
| title_fullStr | A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations |
| title_full_unstemmed | A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations |
| title_short | A Search for a Sub-Earth-Sized Companion to GJ 436 and a Novel Method to Calibrate Warm Spitzer IRAC Observations |
| title_sort | search for a sub earth sized companion to gj 436 and a novel method to calibrate warm spitzer irac observations |
| url | http://hdl.handle.net/1721.1/74046 https://orcid.org/0000-0002-6892-6948 |
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