TY - JOUR
T1 - HST/nicmos detection of HR 8799 B in 1998
AU - Lafrenière, David
AU - Marois, Christian
AU - Doyon, René
AU - Barman, Travis
N1 - Funding Information:
and C.M. are supported in part through postdoctoral fellowships from the Fonds Québécois de la Recherche sur la Nature et les Technologies. R.D. is supported through a grant from the Natural Sciences and Engineering Research Council of Canada.
PY - 2009
Y1 - 2009
N2 - Three planets have been directly imaged around the young star HR 8799. The planets are 5-13 M Jup and orbit the star at projected separations of 24-68 AU. While the initial detection occurred in 2007, two of the planets were recovered in a reanalysis of data obtained in 2004. Here we present a detection of the furthest planet of that system, HR 8799 b, in archival Hubble Space Telescope (HST)/Near Infrared Camera and Multi-Object Spectrometer (NICMOS) data from 1998. The detection was made using the locally optimized combination of images algorithm to construct, from a large set of HST/NICMOS images of different stars taken from the archive, an optimized reference point-spread function image used to subtract the light of the primary star from the images of HR 8799. This new approach improves the sensitivity to planets at small separations by a factor of 10 compared to traditional roll deconvolution. The new detection provides an astrometry point 10 years before the most recent observations, and is consistent with a Keplerian circular orbit with a 70 AU and low orbital inclination. The new photometry point, in the F160W filter, is in good agreement with an atmosphere model with intermediate clouds and vertical stratification, and thus suggests the presence of significant water absorption in the planet's atmosphere. The success of the new approach used here highlights a path for the search and characterization of exoplanets with future space telescopes, such as the James Webb Space Telescope or a Terrestrial Planet Finder.
AB - Three planets have been directly imaged around the young star HR 8799. The planets are 5-13 M Jup and orbit the star at projected separations of 24-68 AU. While the initial detection occurred in 2007, two of the planets were recovered in a reanalysis of data obtained in 2004. Here we present a detection of the furthest planet of that system, HR 8799 b, in archival Hubble Space Telescope (HST)/Near Infrared Camera and Multi-Object Spectrometer (NICMOS) data from 1998. The detection was made using the locally optimized combination of images algorithm to construct, from a large set of HST/NICMOS images of different stars taken from the archive, an optimized reference point-spread function image used to subtract the light of the primary star from the images of HR 8799. This new approach improves the sensitivity to planets at small separations by a factor of 10 compared to traditional roll deconvolution. The new detection provides an astrometry point 10 years before the most recent observations, and is consistent with a Keplerian circular orbit with a 70 AU and low orbital inclination. The new photometry point, in the F160W filter, is in good agreement with an atmosphere model with intermediate clouds and vertical stratification, and thus suggests the presence of significant water absorption in the planet's atmosphere. The success of the new approach used here highlights a path for the search and characterization of exoplanets with future space telescopes, such as the James Webb Space Telescope or a Terrestrial Planet Finder.
KW - Planetary systems
KW - Techniques: image processing
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U2 - 10.1088/0004-637X/694/2/L148
DO - 10.1088/0004-637X/694/2/L148
M3 - Article
AN - SCOPUS:64849092075
SN - 0004-637X
VL - 694
SP - L148-L152
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
ER -