Detection of the water reservoir in a forming planetary system.
Science
; 334(6054): 338-40, 2011 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-22021851
ABSTRACT
Icy bodies may have delivered the oceans to the early Earth, yet little is known about water in the ice-dominated regions of extrasolar planet-forming disks. The Heterodyne Instrument for the Far-Infrared on board the Herschel Space Observatory has detected emission lines from both spin isomers of cold water vapor from the disk around the young star TW Hydrae. This water vapor likely originates from ice-coated solids near the disk surface, hinting at a water ice reservoir equivalent to several thousand Earth oceans in mass. The water's ortho-to-para ratio falls well below that of solar system comets, suggesting that comets contain heterogeneous ice mixtures collected across the entire solar nebula during the early stages of planetary birth.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vapor
/
Planetas
/
Astros Celestes
/
Gelo
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article