Herschel Finds Star Possibly Making Planets Past Its Prime

At roughly 10 million years old and 176 light years away, TW Hydrae is relatively close to Earth by astronomical standards. Its planet-forming disk has been well studied. TW Hydrae is relatively young but, in theory, it is past the age at which giant planets already may have formed. 

“We didn’t expect to see so much gas around this star,” said Edwin Bergin of the University of Michigan in Ann Arbor. Bergin led the new study appearing in the journal Nature. “Typically stars of this age have cleared out their surrounding material, but this star still has enough mass to make the equivalent of 50 Jupiters,” Bergin said. 

In addition to revealing the peculiar state of the star, the findings also demonstrate a new, more precise method for weighing planet-forming disks. Previous techniques for assessing the mass were indirect and uncertain. The new method can directly probe the gas that typically goes into making planets. 

“Before, we had to use a proxy to guess the gas quantity in the planet-forming disks,” said Paul Goldsmith, the NASA project scientist for Herschel at NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, Calif. “This is another example of Herschel’s versatility and sensitivity yielding important new results about star and planet formation.” 

Using Herschel, they were able to take a fresh look at the disk with the space telescope to analyze light coming from TW Hydrae and pick out the spectral signature of a gas called hydrogen deuteride. Simple hydrogen molecules are the main gas component of planets, but they emit light at wavelengths too short to be detected by Herschel. Gas molecules containing deuterium, a heavier version of hydrogen, emit light at longer, far-infrared wavelengths that Herschel is equipped to see. This enabled astronomers to measure the levels of hydrogen deuteride and obtain the weight of the disk with the highest precision yet. 

“The new results are another important step in understanding the diversity of planetary systems in our universe,” said Bergin. “We are now observing systems with massive Jupiters, super-Earths, and many Neptune-like worlds. By weighing systems at their birth, we gain insight into how our own solar system formed with just one of many possible planetary configurations.” 

 

 Credit: ESA

Herschel is a European Space Agency (ESA) cornerstone mission, with science instruments provided by a consortium of European institutes and with important participation by NASA.
“Knowing the mass of a planet-forming disk is crucial to understanding how and when planets take shape around other stars,” said Glenn Wahlgren, Herschel program scientist at NASA Headquarters in Washington. 

Whether TW Hydrae’s large disk will lead to an exotic planetary system with larger and more numerous planets than ours remains to be seen, but the new information helps define the range of possible planet scenarios. 

NASA’s Herschel Project Office is based at JPL, which contributed mission-enabling technology for two of Herschel’s three science instruments. NASA’s Herschel Science Center, part of the Infrared Processing and Analysis Center at the California Institute of Technology (Caltech) in Pasadena, supports the United States astronomical community. Caltech manages JPL for NASA.