Astronomers have identified some of the youngest stars ever seen, thanks to the European Space Agency’s (ESA) Herschel space observatory.
Dense envelopes of gas and dust surround the fledgling stars known as protostars, making their detection difficult. The 15 newly observed protostars turned up by surprise in a survey of the biggest site of star formation near our solar system, located in the constellation Orion.
The discovery offers scientists a peek into one of the earliest and least understood phases of star formation.
“Herschel has revealed the largest ensemble of such young stars in a single star-forming region,” explained Amelia Stutz a postdoctoral researcher at the Max Planck Institute for Astronomy in Heidelberg, Germany.
“With these results, we are getting closer to witnessing the moment when a star begins to form.”
As Stutz notes, stars spring to life from the gravitational collapse of massive clouds of gas and dust. This changeover from stray, cool gas to the ball of super-hot plasma we call a star is relatively quick by cosmic standards, lasting only a few hundred thousand years. Finding protostars in their earliest, most short-lived and dimmest stages poses a challenge.
Astronomers long had investigated the stellar nursery in the Orion Molecular Cloud Complex, a vast collection of star-forming clouds, but had not seen the newly identified protostars until Herschel observed the region.
“Previous studies have missed the densest, youngest and potentially most extreme and cold protostars in Orion,” Stutz said. “These sources may be able to help us better understand how the process of star formation proceeds at the very earliest stages, when most of the stellar mass is built up and physical conditions are hardest to observe.”
Herschel spied the protostars in far-infrared, or long-wavelength, light, which can shine through the dense clouds around burgeoning stars that block out higher-energy, shorter wavelengths, including the light our eyes see.
The Herschel Photodetector Array Camera and Spectrometer (PACS) instrument collected infrared light at 70 and 160 micrometers in wavelength, comparable to the width of a human hair. Researchers compared these observations to previous scans of the star-forming regions in Orion taken by Spitzer.
Extremely young protostars identified in the Herschel views but too cold to be picked up in most of the Spitzer data were further verified with radio wave observations from the APEX ground telescope.
“Our observations provide a first glimpse at protostars that have just begun to ‘glow’ at far-infrared wavelengths,” said Elise Furlan, a postdoctoral research associate at the National Optical Astronomy Observatory in Tucson, Ariz.
Of the 15 newly discovered protostars, 11 possess very red colors, meaning their light output trends toward the low-energy end of the electromagnetic spectrum. This output indicates the stars are still embedded deeply in a gaseous envelope, meaning they are very young. An additional seven protostars previously seen by Spitzer share this characteristic.
Together, these 18 budding stars comprise only five percent of the protostars and candidate protostars observed in Orion. That figure implies the very youngest stars spend perhaps 25,000 years in this phase of their development, a mere blink of an eye considering a star like our sun lives for about 10 billion years.
Researchers hope to document chronologically each stage of a star’s development rather like a family album, from before birth to early infancy, when planets also
take shape.
“With these recent findings, we add an important missing photo to the family album of stellar development,” said Glenn Wahlgren, Herschel Program Scientist at NASA Headquarters in Washington. “Herschel has allowed us to study stars in their infancy.”
