A candidate substellar companion to HR 7329

Citation
Pj. Lowrance et al., A candidate substellar companion to HR 7329, ASTROPHYS J, 541(1), 2000, pp. 390-395
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004-637X → ACNP
Volume
541
Issue
1
Year of publication
2000
Part
1
Pages
390 - 395
Database
ISI
SICI code
0004-637X(20000920)541:1<390:ACSCTH>2.0.ZU;2-F
Abstract
We present the discovery of a candidate substellar companion from a survey of nearby young stars made with the Near-Infrared Camera and Multiobject Sp ectrometer coronagraph on the Hubble Space Telescope. The H approximate to 12 mag object was discovered approximately 4 " from the young A0 V star HR 7329. Using follow-up spectroscopy from the Space Telescope Imaging Spectro graph, we derive a spectral type between M7 V and M8 V with an effective te mperature of similar to 2600 K. We estimate that the probability of a chanc e alignment with a foreground dwarf star of this nature is similar to 10(-8 ), and therefore we suggest that the object (HR 7329B) is physically associ ated with HR 7329, with a projected separation of 200 AU. Current brown dwa rf cooling models indicate a mass of less than 50 M-Jup for HR 7329B based on age estimates of less than or equal to 30 Myr for HR 7329A.