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e-PulsarOct - Nov 98

Astronomical Feature of the Month
GAS GIANTS


TMD-1Gas giants are the biggest thing in a solar system besides a star itself. Despite that, the glare of a star makes them all but impossible to see. Unless you get lucky...  This is a Hubble telescope near-infrared image of a pair of newborn binary stars in the Taurus system, 450 light years distant.

It shows a long thin nebula pointing toward a faint companion object (bottom left) which could be the first extrasolar planet to be imaged directly. The brightest objects in the image are binary protostars, which illuminate an extended cloud of gas and dust from which the stars formed. So much dust surrounds these protostars that they are virtually invisible at optical wavelengths. However, near-infrared light penetrates dust, revealing the newborn stars within.

At lower left there is a point of light many times fainter than the binary pair. Current models predict that very young giant planets are warm from gravitational contraction and formation processes with temperatures as high as a few thousand degrees Fahrenheit. This is consistent with the observed brightness of the companion. The candidate protoplanet appears to be 130 billion miles from the binary (1400 times the Earth's distance from the Sun). The bright streak of nebulosity may indicate that it was ejected from the system.

A young planet ejected from a binary system would represent a unique opportunity to study an extrasolar planet - and could be the subject matter for a nice painting or two.... Data source: NASA


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