TITLE

A spectrum of an extrasolar planet

AUTHOR(S)
Richardson, L. Jeremy; Deming, Drake; Horning, Karen; Seager, Sara; Harrington, Joseph
PUB. DATE
February 2007
SOURCE
Nature;2/22/2007, Vol. 445 Issue 7130, p892
SOURCE TYPE
Academic Journal
DOC. TYPE
Letter
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 µm) 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 µm that we attribute to emission by silicate clouds. We also find a narrow, unidentified emission feature at 7.78 µm. Models of these ‘hot Jupiter’ planets predict a flux peak near 10 µm, where thermal emission from the deep atmosphere emerges relatively unimpeded by water absorption, but models dominated by water fit the observed spectrum poorly.
ACCESSION #
24110167

 

Related Articles

  • Planet from hell. da Silva, Wilson // New Scientist;9/7/91, Vol. 131 Issue 1785, p66 

    Presents a letter to the editor of 'New Scientist' suggesting the name Hades for the first planet discovered outside the solar system.

  • Letters. Nasila, Mikko; Radice, Edoardo; Rounds, John // Sky & Telescope;Nov2011, Vol. 122 Issue 5, p8 

    Several letters to the editor are presented in response to articles that appeared in "Sky & Telescope" including opinion on the use of headlights, tail-lights and flashlights during observation of the dark skies, "The Battle to Control Light Pollution," and "The Exoplanets That Weren't."

  • Letters. Rabb, Jeff; Talcott, Richard; Biermann, Bill; Lucas, Russ; Huck, Kenneth; Fischer, Debra // Astronomy;Apr2011, Vol. 39 Issue 4, p12 

    Letters to the editor are presented in response to articles in previous issues including "How Five Doomed Missions Triumphed in the End," by Richard Talcott in the December 2010 issue, "Twilight Musings," by Stephen James O'Meara in the January 2011 issue, and "How Astronomers Will Find Another...

  • MAIL. Spence, Nick; Brian, Danny; Schutt, Misha; Jacobs, Matthew // Discover;Jan2009, Vol. 30 Issue 1, p7 

    Letters to the editor in response to articles in the November, 2008 issue are presented, including "Quest for a Second Earth," "Bending Time," and "#s: Engineering Earth to Stop Climate Change."

  • How to count alien worlds. Cowen, Robert C. // Christian Science Monitor;11/16/2000, Vol. 92 Issue 250, p17 

    Discusses a scientific study which suggests that the number of reportedly discovered extrasolar, alien planets is twice the justifiable number.

  • Does 51 Pegasi's planet really exist? Roth, Joshua // Sky & Telescope;May97, Vol. 93 Issue 5, p24 

    Focuses on lines of evidence casting doubt on the existence of a planet orbiting the star 51 Pegasi. Wiggling of the star's iron absorption line; Star pulsations; Nature of the star's radial-velocity variations.

  • Two new planets touted.  // Sky & Telescope;Jul97, Vol. 94 Issue 1, p16 

    Cites studies indicating the existence of extrasolar planets. Unseen companions of the star Rho Coronae Borealis and the pulsar Geminga; Variation in line-of-sight velocity.

  • Sizing Up the "New" Planets.  // Science World (Teacher's Edition);09/06/99, Vol. 56 Issue 1, p5 

    Features a quiz on a comparison between the extrasolar planets of the system of the star Upsilon Andromedae with that of the planet Earth's solar system.

  • Shadow Of A Distant Planet. Wilson, Jim; Coledan, Stefano // Popular Mechanics;Feb2000, Vol. 177 Issue 2, p19 

    Highlights observations of extrasolar planets beyond the solar system.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics