[asa] Protoplanet "without form and void"

From: George Cooper <georgecooper@sbcglobal.net>
Date: Wed Apr 02 2008 - 21:28:27 EDT

Well, that's my own spin on, of course.
  A little over a month ago, an image was produced that revealed a void in a young stellar accretion disk. In the center of this void is, likely, a protoplanetary disk which will eventually produce a planet (or a brown dwarf). [Protoplanetary disks are very large compared to a planet, so it is assumed that is what they are able to see, since planets are too small to see.]
  This planet is without form, and it is in a void, which has been a prediction of planetary formation theories. However, this is the very first image of one.
  [Oddly, they seem to go out of their way to describe the void, using: "depleted region of dust", "hole", and "darker area". ]
  Of course, the red and yellow coloring is false color imaging to enhance certain properties of the disk, probably temperature.
  The particle sizes of young disks are very effective scatterers of light. More specifically, they will cause Rayleigh Scattering which produces one dominant color from any bright starlight - blue. Many stellar nurseries have been observed, and they can be very close to one another initially, as well as, very bright. Thus, some early disks will, likely, appear blue even to the naked eye. An ancient observer might best describe this emense span of blue as "waters".
  I find this very interesting.

To unsubscribe, send a message to majordomo@calvin.edu with
"unsubscribe asa" (no quotes) as the body of the message.
Received on Wed Apr 2 21:29:31 2008

This archive was generated by hypermail 2.1.8 : Wed Apr 02 2008 - 21:29:31 EDT