HST/nicmos detection of HR 8799 B in 1998

David Lafrenière, Christian Marois, René Doyon, Travis S Barman

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume694
Issue number2
DOIs
StatePublished - 2009
Externally publishedYes

Fingerprint

Hubble Space Telescope
planets
planet
stars
cameras
near infrared
spectrometers
spectrometer
atmospheres
James Webb Space Telescope
terrestrial planets
astrometry
circular orbits
extrasolar planets
point spread functions
stratification
atmosphere
deconvolution
inclination
photometry

Keywords

  • Planetary systems
  • Techniques: image processing

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

HST/nicmos detection of HR 8799 B in 1998. / Lafrenière, David; Marois, Christian; Doyon, René; Barman, Travis S.

In: Astrophysical Journal, Vol. 694, No. 2, 2009.

Research output: Contribution to journalArticle

Lafrenière, David ; Marois, Christian ; Doyon, René ; Barman, Travis S. / HST/nicmos detection of HR 8799 B in 1998. In: Astrophysical Journal. 2009 ; Vol. 694, No. 2.
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