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Title:
A Near-Infrared Search for Companions around Very Low Luminosity Young Stellar Objects in Taurus
Authors:
Itoh, Yoichi; Tamura, Motohide; Nakajima, Tadashi
Affiliation:
AA(Department of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; ), AB(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; , ), AC(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; , )
Publication:
The Astronomical Journal, Volume 117, Issue 3, pp. 1471-1484. (AJ Homepage)
Publication Date:
03/1999
Origin:
AJ
AJ Keywords:
STARS: BINARIES: GENERAL, STARS: FORMATION, STARS: LOW-MASS, BROWN DWARFS
DOI:
10.1086/300782
Bibliographic Code:
1999AJ....117.1471I

Abstract

We have carried out a near-infrared search for companions around 23 very low luminosity young stellar objects (YSOs) in the Taurus molecular cloud. After sophisticated photometry and analysis, five extremely low luminosity YSO (ELL-YSO) candidate companions were identified by both their near-infrared colors and proximity to the primary (separation less than 6"). They show infrared excess, as do ordinary YSOs. Their absolute J-band magnitudes range from 9 to 12 mag. The masses of these companions are estimated from their J-band luminosities, which use recent evolutionary tracks for very low mass objects. It is found that all are young brown dwarf candidates. The Ks-band magnitude difference between the ELL-YSO candidate companions and their primaries ranges from 2 to 6 mag, significantly larger than observed in T Tauri binaries. It is suggested that the companions are formed by the fragmentation of a disk around the primary. The binary frequency is 22^+9_-10% for systems with a period ranging between 10^7-10^8 days. This frequency is consistent with that of T Tauri stars, but it is significantly higher than that of low-mass main-sequence stars.
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