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News Release Archive:

News Release 144 of 951

October 6, 2011 09:00 AM (EDT)

News Release Number: STScI-2011-29

Astronomers Find Elusive Planets in Decade-Old Hubble Data

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Image: HR 8799 Exoplanet System

HR 8799 Exoplanet SystemSTScI-PRC2011-29

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ABOUT THIS IMAGE:

Left: This is an image of the star HR 8799 taken by Hubble's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) in 1998. A mask within the camera (coronagraph) blocks most of the light from the star. In addition, software has been used to digitally subtract more starlight. Nevertheless, scattered light from HR 8799 dominates the image, obscuring the faint planets.

Center: Recent, sophisticated software processing of the NICMOS data removes most of the scattered starlight to reveal three planets orbiting HR 8799. Astronomers used this decade-old image to calculate the orbits of the planets.

Right: This is an illustration of the HR 8799 exoplanet system based on the reanalysis of Hubble NICMOS data and ground-based observations. The positions of the star and the orbits of the four known planets are shown schematically. The sizes of the dots are not to scale with the planet's true sizes. The three outermost planets, b, c, and d, are detected in both the NICMOS and ground-based data. A fourth, inner planet, e, was detected in ground-based observations. The orbits appear elongated because of a slight tilt of the plane of the orbits relative to our line of sight. The size of the HR 8799 planetary system is comparable to our solar system, as indicated by the orbit of Neptune, shown to scale.

Object Name: HR 8799

Image Type: Astronomical/Illustration/Annotated

Credit: NASA, ESA, and R. Soummer (STScI)

NEWS RELEASE IMAGES

The above montage includes these images:

NICMOS Image of HR 8799 Planetary System Image Type: Astronomical NICMOS Image of HR 8799 Planetary System Software-Processed NICMOS Image of HR 8799 Planetary System Image Type: Astronomical/Data Software-Processed NICMOS Image of HR 8799 Planetary System Positional Schmatic of the Members of the HR 8799 Exoplanet System Image Type: Illustration Positional Schmatic of the Members of the HR 8799 Exoplanet System

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