Abstract
Here we explore the capabilities of NASA's 3.0 m Infrared Telescope Facility (IRTF) and SpeX spectrometer and the 5.08 m Hale telescope with the TripleSpec spectrometer with near-infrared H-, K-, and L-band measurements of HD 209458b's secondary eclipse. Our IRTF/SpeX data are the first absolute L-band spectroscopic emission measurements of any exoplanet other than the hot Jupiter HD 189733b. Previous measurements of HD 189733b's L band indicate bright emission hypothesized to result from non-LTE CH4 ν3 fluorescence. We do not detect a similar bright 3.3 μm feature to ∼3σ, suggesting that fluorescence does not need to be invoked to explain HD 209458b's L-band measurements. The validity of our observation and reduction techniques, which decrease the flux variance by up to 2.8 orders of magnitude, is reinforced by 1σ agreement with existent Hubble/NICMOS and Spitzer/IRAC1 observations that overlap the H, K, and L bands, suggesting that both IRTF/SpeX and Palomar/TripleSpec can measure an exoplanet's emission with high precision.
Original language | English (US) |
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Article number | 48 |
Journal | Astrophysical Journal |
Volume | 796 |
Issue number | 1 |
DOIs | |
State | Published - Nov 20 2014 |
Keywords
- Atmospheric effects
- Methods: numerical
- Planets and satellites: general
- Planets and satellites: individual (HD 209458b)
- Techniques: spectroscopic
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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Potential exoplanet targets with Palomar/TripleSpec
Zellem, R. T. (Creator), Griffith, C. A. (Creator), Deroo, P. (Creator), Swain, M. R. (Creator) & Waldmann, I. P. (Creator), Centre de Donnees Strasbourg (CDS), 2017
DOI: 10.26093/cds/vizier.17960048, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/796/48
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