Everything about Planetar Astronomy totally explained
Planetar is a term used in
astronomy that refers to one of two things:*
Brown dwarfs - objects intermediate in size between planets and stars.
- Interstellar planets - planetars that are cold masses smaller than brown dwarfs and don't orbit a star, but are free-floating in space.
Both definitions have been proposed, but neither has achieved wide usage in the astronomical and planetary science communities.
Brown dwarf planetars
Planetars are planet-like objects that are more massive than the low-mass cut-off for
brown dwarfs. These generally are referred to as
brown dwarfs. However, a planetar is formed in the manner of planets, through accretion or core collapse from a circumstellar disc, and not through the collapse of a gas cloud. The distinction between a planetar and a brown dwarf is unclear, astronomers are divided into two camps as whether to consider the formation process of a planet as part of its division in classification. Such a planet might also be referred to as a
hypergiant planet.
Red dwarf planetars
Hypothetically an ultra-giant planet may result from planetary formation large enough to become a
red dwarf. Perhaps even larger stars may form from discs of gas of
Population III protostars.
Unbound planet planetars
Interstellar planetary mass objects, also known as
planetars, are called such, because a portion of the astronomy community defines a
planet as something that must orbit a
star. Any
planetary-mass object which doesn't orbit a star, can't according to that rule be called a planet. As it exists alone like a star, it's called a planet-star, or shorter
planetar. In 2003, the IAU Extrasolar Planet Working Group recommended that these objects be called
sub-brown dwarfs.
Some of these
planemo harbour debris discs akin to
proplyds. The
planemo 2M1207b has been discovered to harbour a disc.
Further Information
Get more info on 'Planetar Astronomy'.
|
External Link Exchanges
Do you know how hard it is to get a link from a large encyclopaedia? Well we're different and will prove it. To get a link from us just add the following HTML to your site on a relevant page:
<a href="http://planetar__astronomy.totallyexplained.com">Planetar (astronomy) Totally Explained</a>
Then simply click through this link from your web page. Our crawlers will verify your link, extract the title of your web page and instantly add a link back to it. If you like you can remove the words Totally Explained and embed the link in article text.
As long as your link remains in place, we'll keep our link to you right here. Please play fair - our crawlers are watching. Your site must be closely related to this one's topic. Any kind of spamming, dubious practises or removing the link will result in your link from us being dropped and, potentially, your whole site being banned. |
