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HD 142527
HD 142527 is a star in the constellation of Lupus.〔http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+142527〕〔Simon Casassus, Gerrit van der Plas, Sebastian Perez M, William R. F. Dent, Ed Fomalont, Janis Hagelberg, Antonio Hales, Andrés Jordán, Dimitri Mawet, Francois Ménard, Al Wootten, David Wilner, A. Meredith Hughes, Matthias R. Schreiber, Julien H. Girard, Barbara Ercolano, Hector Canovas, Pablo E. Román & Vachail Salinas,(Flows of gas through a protoplanetary gap ), Nature 493, 191–194 (10 January 2013) .〕 It is notable for its protoplanetary disk and its discovery has has helped refine models of planet formation.
==Protoplanetary Disk==
HD 142527 is an extremely young star, aged about 1 million years old〔Hideaki Fujiwara, Mitsuhiko Honda, Hirokazu Kataza, Takuya Yamashita, Takashi Onaka, Misato Fukagawa, Yoshiko K. Okamoto, Takashi Miyata, Shigeyuki Sako, Takuya Fujiyoshi, Itsuki Sakon. The Asymmetric Thermal Emission of Protoplanetary Disk Surrounding HD 142527 Seen by Subaru/COMICS〕 so it retains its protoplanetary disk which has a mass of 15% of the mass of the Sun and a diameter of 980AUs.
The studies have shown eddies and vortex structures forming in the nebulae under the influence of two large planets.〔Simon Casassus et al. ( Flows of gas through a protoplanetary gap ). Nature (02 January 2013). 〕 The star is important as it allows Astronomers to observe the accretion process in planetary formation.
In early 2013 an article was published by astronomers, working with the ALMA telescope in Chile, which refers to the discovery of two massive flows of matter in the system.〔Simon Casassus et al. ,( Flows of gas through a protoplanetary gap ), Nature 493, 191–194 (10 January 2013).〕 Substance consisting of dust and gas, is transferred from the periphery to the center due to gravitational interaction with two giant planets that have a mass several times greater than the mass of Jupiter. Thus, the flows are a kind of "pumps" pumping material from the edge of the center, "feeding" star. The planets themselves have not been detected so far, due to a dense shroud of gas. However, astronomers proposed models that describe their existence.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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