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This profile was last updated on 1/9/13  and contains information from public web pages.

Dr. Karl Stapelfeldt

Wrong Dr. Karl Stapelfeldt?

Chief of the Exoplanets and Stell...

Local Address: Greenbelt, Maryland, United States
Nasa
 
Background

Employment History

Education

  • Ph.D. , astronomy
    California Institute of Technology
45 Total References
Web References
"Upcoming new facilities such as ...
www.space.com, 9 Jan 2013 [cached]
"Upcoming new facilities such as NASA's James Webb Space Telescope should be able to find the planets," paper co-author Karl Stapelfeldt, chief of the Exoplanets and Stellar Astrophysics Laboratory at NASA's Goddard Space Flight Center in Greenbelt, Md., said in a statement.
"Upcoming new facilities such as ...
www.knowledgeorb.com, 9 July 2012 [cached]
"Upcoming new facilities such as NASA's James Webb Space Telescope should be able to find the planets," said paper co-author Karl Stapelfeldt, chief of the Exoplanets and Stellar Astrophysics Laboratory at NASA's Goddard Space Flight Center in Greenbelt, Md.
"Because the system is so close ...
www.spaceguarduk.com, 27 Oct 2008 [cached]
"Because the system is so close to us, Spitzer can really pick out details in the dust, giving us a good look at the system's architecture," said co-author Karl Stapelfeldt of NASA's Jet Propulsion Laboratory, Pasadena, Calif.
"It's not often you get a ...
home.discover.com, 6 July 2001 [cached]
"It's not often you get a chance to catch stars in the act," says Karl Stapelfeldt, an astronomer at NASA's Jet Propulsion Laboratory and a member of the team.
The ongoing study has already yielded an intimate look at how stars grow up.Images taken over a five-year period show that, like small children, the stars' appearance changed radically in a matter of months.In a time-lapse movie available at the Space Telescope Science Institute's Web site, a bubble of gas nearly 60 billion miles in length escapes from XZ Tauri.
...
"We don't really know what this is," says Stapelfeldt, who hopes that another observation of the star this winter will help clear up that mystery.
The second star, HH 30, appears as two flat discs, with jets of gas erupting from it at up to 600,000 miles per hour.The discs are clouds of dust that block light coming directly from the star but are brightened by its reflection."If you look closely at the discs and ignore the jets, you can see light shifting within them," Stapelfeldt says.The star and the inner part of the discs appear to be illuminating the outer part of the discs "like a lighthouse illuminates a cloud with its beam.The beam rotates, and the clouds seem to brighten and then fade."This lighthouse effect seems to be rotating between once every few days and once a year.No one has ever observed this phenomenon before, and the team hopes to clarify what's happening with more Hubble time.
Although this may look like a tempestuous nursery, colossal gas bubbles and jets are just normal celestial growing pains for infant stars.
November 2005 presentation by Dr. ...
www.ossc.org [cached]
November 2005 presentation by Dr. Karl Stapelfeldt, JPL
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