2008/06/13 by A. Scholz, Alexander Scholz, Ray Jayawardhana +7 · 1 citation
Chemistry · Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Brown dwarf #Galaxy #Infrared #Low Mass #Millimeter #Molecular Spectroscopy and Structure #Optics #Photometry (optics) #Photosphere #Physics #Protostar #Radiative transfer #Spectral energy distribution #Spectral line #Star formation #Stars #Stellar, planetary, and galactic studies #Young stellar object #astro-ph
paper · pdf · doi:10.1086/590339
5 pages, 3 figures, Astrophysical Journal Letters, in press
arxiv created 2008/06/13 · openalex publication_date 2008/06/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
IRAS 04325+2402C is a low-luminosity object located near a protostar in Taurus. We present new spatially resolved millimeter observations, near-infrared spectroscopy, and Spitzer photometry that improve the constraints on the nature of this source. The object is clearly detected in our 1.3 mm interferometry map, allowing us to estimate the mass in a localized disk+envelope around it to be in the range of 0.001-0.01 M ☉ . Thus IRAS 04325C is unlikely to accrete significantly more mass. The near-infrared spectrum cannot be explained with an extincted photosphere alone, but is consistent with a 0.03-0.1 M ☉ central source plus moderate veiling, seen in scattered light, confirming the edge-on nature of the disk. Based on K -band flux and spectral slope we conclude that a central object mass ≳0.1 M ☉ is unlikely. Our comparison of the full spectral energy distribution, including new Spitzer photometry, with radiative transfer models confirms the high inclination of the disk (≳80°), the very low mass of the central source, and the small amount of circumstellar material. IRAS 04325C is one of the lowest mass objects with a resolved edge-on disk known to date, possibly a young brown dwarf, and a likely wide companion to a more massive star. With these combined properties, it represents a unique case to study the formation and early evolution of very low mass objects.