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The 3.6–8.0 μm Broadband Emission Spectrum of HD 209458b: Evidence for an Atmospheric Temperature Inversion
Open accessAbstract
We estimate the strength of the bandpass-integrated thermal emission from the extrasolar planet HD 209458b at 3.6, 4.5, 5.8, and 8.0 μm using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope . We observe a single secondary eclipse simultaneously in all four bandpasses and find relative eclipse depths of 0.00094 ± 0.00009, 0.00213 ± 0.00015, 0.00301 ± 0.00043, and 0.00240 ± 0.00026, respectively. These eclipse depths reveal that the shape of the inferred emission spectrum for the planet differs significantly from the predictions of standard atmosphere models; instead, the most plausible explanation would require the presence of an inversion layer high in the atmosphere leading to significant water emission in the 4.5 and 5.8 μm bandpasses. This is the first clear indication of such a temperature inversion in the atmosphere of a hot Jupiter, as previous observations of other planets appeared to be in reasonably good agreement with the predictions of models without such an inversion layer.
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Cited by
Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
Gillon, M., Triaud, A. H. M. J., Demory, B.-O., Jehin, E., Agol, E., Deck, K. M., Lederer, S. M., de Wit, J., Burdanov, A., Ingalls, J. G., et al. (2017) · Nature · doi:10.1038/nature21360 · Cited by 1,555
Moses, J. I., Visscher, C., Fortney, J. J., Showman, A. P., Lewis, N. K., Griffith, C. A., Klippenstein, S. J., Shabram, M., Friedson, A. J., Marley, M. S., et al. (2011) · The Astrophysical Journal · doi:10.1088/0004-637x/737/1/15 · Cited by 490
Seager, S., & Deming, D. (2010) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081309-130837 · Cited by 435
CAN TiO EXPLAIN THERMAL INVERSIONS IN THE UPPER ATMOSPHERES OF IRRADIATED GIANT PLANETS?
Spiegel, D. S., Silverio, K., & Burrows, A. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/699/2/1487 · Cited by 310
Self-citationDeming, D., Knutson, H., Kammer, J., Fulton, B. J., Ingalls, J., Carey, S., Burrows, A., Fortney, J. J., Todorov, K., Agol, E., et al. (2015) · The Astrophysical Journal · doi:10.1088/0004-637x/805/2/132 · Cited by 274
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Metadata
- Authors
- Knutson, H. A., Charbonneau, D., Allen, L. E., Burrows, A., & Megeath, S. T.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2008-01-20
- Volume
- 673
- Issue
- 1
- Pages
- 526-531
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2085398929
- Cited by
- 458
- References
- 0
- FWCI
- 31.44
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Knutson, H. A., Charbonneau, D., Allen, L. E., Burrows, A., & Megeath, S. T. (2008). The 3.6–8.0 μm Broadband Emission Spectrum of HD 209458b: Evidence for an Atmospheric Temperature Inversion. The Astrophysical Journal. https://doi.org/10.1086/523894
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