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A spectrum of an extrasolar planet.
Nature. 2007 Feb 22; 445(7130):892-5.Nat

Abstract

Of the over 200 known extrasolar planets, 14 exhibit transits in front of their parent stars as seen from Earth. Spectroscopic observations of the transiting planets can probe the physical conditions of their atmospheres. One such technique can be used to derive the planetary spectrum by subtracting the stellar spectrum measured during eclipse (planet hidden behind star) from the combined-light spectrum measured outside eclipse (star + planet). Although several attempts have been made from Earth-based observatories, no spectrum has yet been measured for any of the established extrasolar planets. Here we report a measurement of the infrared spectrum (7.5-13.2 microm) of the transiting extrasolar planet HD 209458b. Our observations reveal a hot thermal continuum for the planetary spectrum, with an approximately constant ratio to the stellar flux over this wavelength range. Superposed on this continuum is a broad emission peak centred near 9.65 microm that we attribute to emission by silicate clouds. We also find a narrow, unidentified emission feature at 7.78 microm. Models of these 'hot Jupiter' planets predict a flux peak near 10 microm, where thermal emission from the deep atmosphere emerges relatively unimpeded by water absorption, but models dominated by water fit the observed spectrum poorly.

Authors+Show Affiliations

Exoplanets and Stellar Astrophysics Laboratory, Mail Code 667, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA. lee.richardson@colorado.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17314975

Citation

Richardson, L Jeremy, et al. "A Spectrum of an Extrasolar Planet." Nature, vol. 445, no. 7130, 2007, pp. 892-5.
Richardson LJ, Deming D, Horning K, et al. A spectrum of an extrasolar planet. Nature. 2007;445(7130):892-5.
Richardson, L. J., Deming, D., Horning, K., Seager, S., & Harrington, J. (2007). A spectrum of an extrasolar planet. Nature, 445(7130), 892-5.
Richardson LJ, et al. A Spectrum of an Extrasolar Planet. Nature. 2007 Feb 22;445(7130):892-5. PubMed PMID: 17314975.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A spectrum of an extrasolar planet. AU - Richardson,L Jeremy, AU - Deming,Drake, AU - Horning,Karen, AU - Seager,Sara, AU - Harrington,Joseph, PY - 2006/12/11/received PY - 2007/02/01/accepted PY - 2007/2/23/pubmed PY - 2007/2/23/medline PY - 2007/2/23/entrez SP - 892 EP - 5 JF - Nature JO - Nature VL - 445 IS - 7130 N2 - Of the over 200 known extrasolar planets, 14 exhibit transits in front of their parent stars as seen from Earth. Spectroscopic observations of the transiting planets can probe the physical conditions of their atmospheres. One such technique can be used to derive the planetary spectrum by subtracting the stellar spectrum measured during eclipse (planet hidden behind star) from the combined-light spectrum measured outside eclipse (star + planet). Although several attempts have been made from Earth-based observatories, no spectrum has yet been measured for any of the established extrasolar planets. Here we report a measurement of the infrared spectrum (7.5-13.2 microm) of the transiting extrasolar planet HD 209458b. Our observations reveal a hot thermal continuum for the planetary spectrum, with an approximately constant ratio to the stellar flux over this wavelength range. Superposed on this continuum is a broad emission peak centred near 9.65 microm that we attribute to emission by silicate clouds. We also find a narrow, unidentified emission feature at 7.78 microm. Models of these 'hot Jupiter' planets predict a flux peak near 10 microm, where thermal emission from the deep atmosphere emerges relatively unimpeded by water absorption, but models dominated by water fit the observed spectrum poorly. SN - 1476-4687 UR - https://www.unboundmedicine.com/medline/citation/17314975/A_spectrum_of_an_extrasolar_planet_ L2 - https://doi.org/10.1038/nature05636 DB - PRIME DP - Unbound Medicine ER -
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