Astrometric detection of sub-stellar companions with GAIA

Authors
Citation
Cf. Quist, Astrometric detection of sub-stellar companions with GAIA, ASTRON ASTR, 370(2), 2001, pp. 672-679
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
370
Issue
2
Year of publication
2001
Pages
672 - 679
Database
ISI
SICI code
0004-6361(200105)370:2<672:ADOSCW>2.0.ZU;2-3
Abstract
Observations with the planned astrometry satellite GAIA are modeled in orde r to determine the detection probabilities for systems consisting of a main -sequence star and a companion of sub-stellar mass. Among the stars within 100 pc from the Sun, most systems having a companion greater than 0.01 sola r masses and with periods between 0.25 and 25 yr will be detected. For thes e systems with periods longer than 10-15 yr, statistical information about orbits is obtained through the curved proper motions. Shorter periods usual ly result in orbital solutions. For nearly all systems with periods less th an five years, accurate orbital elements are obtained from which companion masses can be estimated. For systems having 0.001 solar mass companions, th e detection probability exceeds 0.1 in the 1.2- 10 yr range. Many of these systems will result in orbital solutions.