2004/11/05 by Sean M. Andrews, Jonathan P. Williams · 7 citations
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/427325
published as Astrophys.J. 619 (2005) L175-L178 · 10 pages, 2 figures, to appear in ApJ Letters
arxiv created 2004/11/05 · openalex publication_date 2005/01/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We present high-resolution aperture synthesis images from the Submillimeter Array of the 225 GHz (1.3 mm) continuum and 12 CO J = 2-1 line emission from the disks around components of the hierarchical triple system SR 24, located in the Ophiuchus star-forming region. The most widely separated component, SR 24 S (with a projected semimajor axis a = 832 AU), has a circumstellar disk with properties typical of those around single T Tauri stars. The binary SR 24 N ( a = 32 AU) is undetected in the continuum but has strong, resolved CO emission that likely originates in a circumbinary disk with a central gap. The data constrain the total disk mass in the SR 24 N system to be ≲10 -3 M ☉ and indicate that the depletion of CO onto dust grains is not more than 100 times larger than the mean value in the interstellar medium. The SR 24 N disk is unusual in that it is only detected in line emission. It is possible that other low-mass disks around binaries and single stars may have been missed in single-dish continuum surveys.