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DOI10.1088/0004-637X/765/2/127
SPITZER TRANSITS OF THE SUPER-EARTH GJ1214b AND IMPLICATIONS FOR ITS ATMOSPHERE
Fraine, Jonathan D.1; Deming, Drake1; Gillon, Michael2; Jehin, Emmanuel2; Demory, Brice-Olivier3,4; Benneke, Bjoern3,4; Seager, Sara3,4; Lewis, Nikole K.5,6; Knutson, Heather7; Desert, Jean-Michel8
通讯作者Fraine, Jonathan D.
来源期刊ASTROPHYSICAL JOURNAL
ISSN0004-637X
EISSN1538-4357
出版年2013
卷号765期号:2
英文摘要

We observed the transiting super-Earth exoplanet GJ1214b using warm Spitzer at 4.5 mu m wavelength during a 20 day quasi-continuous sequence in 2011 May. The goals of our long observation were to accurately define the infrared transit radius of this nearby super-Earth, to search for the secondary eclipse, and to search for other transiting planets in the habitable zone of GJ1214. We here report results from the transit monitoring of GJ1214b, including a reanalysis of previous transit observations by Desert et al. In total, we analyze 14 transits of GJ1214b at 4.5 mu m, 3 transits at 3.6 mu m, and 7 new ground-based transits in the I + z band. Our new Spitzer data by themselves eliminate cloudless solar composition atmospheres for GJ1214b, and methane-rich models from Howe & Burrows. Using our new Spitzer measurements to anchor the observed transit radii of GJ1214b at long wavelengths, and adding new measurements in I + z, we evaluate models from Benneke & Seager and Howe & Burrows using chi(2) analysis. We find that the best-fit model exhibits an increase in transit radius at short wavelengths due to Rayleigh scattering. Pure water atmospheres are also possible. However, a flat line ( no atmosphere detected) remains among the best of the statistically acceptable models, and better than pure water atmospheres. We explore the effect of systematic differences among results from different observational groups, and we find that the Howe & Burrows tholin-haze model remains the best fit, even when systematic differences among observers are considered.


英文关键词infrared: planetary systems planets and satellites: atmospheres planets and satellites: composition techniques: photometric
类型Article
语种英语
国家USA ; Belgium
收录类别SCI-E
WOS记录号WOS:000315921500052
WOS关键词GJ 1214B ; TRANSMISSION SPECTRUM ; HD 189733B ; SEARCH ; SPECTROSCOPY ; PHOTOMETRY ; CURVES
WOS类目Astronomy & Astrophysics
WOS研究方向Astronomy & Astrophysics
来源机构University of Arizona
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/175958
作者单位1.Univ Maryland, Dept Astron, College Pk, MD 20742 USA;
2.Univ Liege, Inst Astrophys & Geophys, Liege, Belgium;
3.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA;
4.MIT, Dept Phys, Cambridge, MA 02139 USA;
5.Univ Arizona, Dept Planetary Sci, Tucson, AZ 85721 USA;
6.Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA;
7.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA;
8.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
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Fraine, Jonathan D.,Deming, Drake,Gillon, Michael,et al. SPITZER TRANSITS OF THE SUPER-EARTH GJ1214b AND IMPLICATIONS FOR ITS ATMOSPHERE[J]. University of Arizona,2013,765(2).
APA Fraine, Jonathan D..,Deming, Drake.,Gillon, Michael.,Jehin, Emmanuel.,Demory, Brice-Olivier.,...&Desert, Jean-Michel.(2013).SPITZER TRANSITS OF THE SUPER-EARTH GJ1214b AND IMPLICATIONS FOR ITS ATMOSPHERE.ASTROPHYSICAL JOURNAL,765(2).
MLA Fraine, Jonathan D.,et al."SPITZER TRANSITS OF THE SUPER-EARTH GJ1214b AND IMPLICATIONS FOR ITS ATMOSPHERE".ASTROPHYSICAL JOURNAL 765.2(2013).
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