Word: hartmann
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Dates: during 1990-1999
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...Hartmann, a senior astrophysicist at the Harvard-Smithsonian Center for Astrophysics, said the hole in the center of the disk "is about the size of a planetary system" which suggests that the disk is the early stage of a solar system. The presence of planets, however, is not in any way confirmed. "We have not detected any planets directly or indirectly," Jayawardhana said...
...Hartmann said he does not think the presence of planets will be detected any time soon...
...think for a long time the evidence is going to have to be indirect," Hartmann said. "One possibility is that the planets might cause ripples in the disk because of their gravity...
According to Hartmann, HR 4796A, a star about 20 times more luminous than the Sun, is "about 8 to 10 million years old" which he said is around the age at which planets are estimated to form...
...Hartmann and Jayawardhana are also collaborating with astronomy lecturer Giovanni G. Fazio...