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News Release Archive:

News Release 466 of 959

February 19, 2004 03:00 PM (EST)

News Release Number: STScI-2004-09

Supernova Shock Wave Is Producing a Spectacular New Light Show

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Image: Hubble Supernova 1987A Scrapbook (1994-2003)

Hubble Supernova 1987A Scrapbook (1994-2003)STScI-PRC2004-09b

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Since its launch in 1990, NASA's Hubble Space Telescope has watched a celestial drama unfold at a stellar demolition site. A shock wave unleashed during a stellar explosion, called Supernova 1987A (SN 1987A), has been racing toward a ring of matter encircling the blast site. Astronomers used Hubble to monitor the ring for signs of the impending bombardment. They detected the first evidence of a collision in 1996 [the bright spot at 11 o'clock in the Feb. 6, 1998 image]. Subsequent observations show dozens more "hot spots" as the blast wave slammed into the ring, compressing and heating the gas, and making it glow.

These images, taken by the Wide Field and Planetary Camera 2 and the Advanced Camera for Surveys, are being released to mark the 17th anniversary of the supernova's discovery. The most recent observations, taken Jan. 5, Aug. 12, and Nov. 28, 2003 by the Advanced Camera for Surveys, show many bright spots along a ring of gas, like pearls on a necklace. The temperature of the hot spots surges from a few thousand degrees to a million degrees Fahrenheit. Curiously, one of the flares on the ring [at 4 o'clock] is just a star that happens to lie along the telescope's line of sight.

Individual hot spots cannot be seen from ground-based telescopes. Only Hubble can resolve them. Since most astronomical events occur over thousands or millions of years, this is a unique opportunity to watch large-scale changes in an object over just a few years. Astronomers also are learning how shock waves really work in the debris of an exploding star.

SN 1987A was the brightest exploding star seen in 400 years when astronomers spotted it on Feb. 23, 1987. The violent death of a star 20 times more massive than the Sun, called a supernova, created this stellar drama. The star actually exploded about 160,000 years ago, but it has taken that long for its light to reach Earth. The supernova resides in the Large Magellanic Cloud, a nearby small galaxy that is a satellite of our Milky Way galaxy.

The ring, about a light-year across, already existed when the star exploded. Astronomers believe the star shed the ring about 20,000 years before the supernova blast. The ring is glowing in the early Hubble photos because it is being heated by ultraviolet radiation from the exploding star. As the gas cooled, the ring began to fade, only to be illuminated again by the shock wave, which is delivering a sledgehammer blow to the ring. This is a rare opportunity for astronomers to see exactly how a supernova explosion is transformed into a supernova remnant, the glowing, expanding gaseous remains of a supernova blast.

The elongated and expanding object in the middle of the ring is debris from the supernova blast. The elliptical shape of the supernova debris provides clues to the violent events that took place deep within the exploding star. The glowing debris is being heated by radioactive elements, principally titanium 44, that were created in the supernova explosion. The debris will continue to glow for many decades.

In a few years, the entire ring will be ablaze as it absorbs the full force of the crash. The glowing ring is expected to become bright enough to illuminate the star's surroundings, thus providing astronomers with new information on how the star ejected material before the explosion.

Object Name: SN1987A

Image Type: Astronomical/Illustration

Credit: NASA, P. Challis, R. Kirshner (Harvard-Smithsonian Center for Astrophysics) and B. Sugerman (STScI)

NEWS RELEASE IMAGES

The above montage includes these images:

Ring Around Supernova 1987A (SN1987A) - September 24, 1994 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - September 24, 1994 Ring Around Supernova 1987A (SN1987A) - March 5, 1995 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - March 5, 1995 Ring Around Supernova 1987A (SN1987A) - February 6, 1996 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - February 6, 1996 Ring Around Supernova 1987A (SN1987A) - July 10, 1997 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - July 10, 1997 Ring Around Supernova 1987A (SN1987A) - February 6, 1998 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - February 6, 1998 Ring Around Supernova 1987A (SN1987A) - January 8, 1999 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - January 8, 1999 Ring Around Supernova 1987A (SN1987A) - April 2, 1999 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - April 2, 1999 Ring Around Supernova 1987A (SN1987A) - February 2, 2000 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - February 2, 2000 Ring Around Supernova 1987A (SN1987A) - June 16, 2000 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - June 16, 2000 Ring Around Supernova SN1987A - November 14, 2000 Image Type: Astronomical Ring Around Supernova SN1987A - November 14, 2000 Supernova 1987A (SN1987A) - March 23, 2001 Image Type: Astronomical Supernova 1987A (SN1987A) - March 23, 2001 Ring Around Supernova 1987A (SN1987A) - December 7, 2001 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - December 7, 2001 Ring Around Supernova 1987A (SN1987A) - January 5, 2003 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - January 5, 2003 Ring Around Supernova 1987A (SN1987A) - August 12, 2003 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - August 12, 2003 Ring Around Supernova 1987A (SN1987A) - November 28, 2003 Image Type: Astronomical Ring Around Supernova 1987A (SN1987A) - November 28, 2003

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