Modeling the resolved disk around the class 0 protostar l1527

John J. Tobin, Lee Hartmann, Hsin Fang Chiang, David J. Wilner, Leslie W. Looney, Laurent Loinard, Nuria Calvet, Paola D'Alessio

Research output: Contribution to journalArticlepeer-review

Abstract

We present high-resolution sub/millimeter interferometric imaging of the Class 0 protostar L1527 IRS (IRAS 04368+2557) at λ = 870 μm and 3.4 mm from the Submillimeter Array and Combined Array for Research in Millimeter Astronomy. We detect the signature of an edge-on disk surrounding the protostar with an observed diameter of 180 AU in the sub/millimeter images. The mass of the disk is estimated to be 0.007 M, assuming optically thin, isothermal dust emission. The millimeter spectral index is observed to be quite shallow at all the spatial scales probed: α ∼ 2, implying a dust opacity spectral index β ∼ 0. We model the emission from the disk and surrounding envelope using Monte Carlo radiative transfer codes, simultaneously fitting the sub/millimeter visibility amplitudes, sub/millimeter images, resolved L′ image, spectral energy distribution, and mid-infrared spectrum. The best-fitting model has a disk radius of R = 125 AU, is highly flared (H∝R 1.3), has a radial density profile ρ∝R -2.5, and has a mass of 0.0075 M. The scale height at 100 AU is 48 AU, about a factor of two greater than vertical hydrostatic equilibrium. The resolved millimeter observations indicate that disks may grow rapidly throughout the Class 0 phase. The mass and radius of the young disk around L1527 are comparable to disks around pre-main-sequence stars; however, the disk is considerably more vertically extended, possibly due to a combination of lower protostellar mass, infall onto the disk upper layers, and little settling of ∼1 μm-sized dust grains.

Original languageEnglish (US)
Article number48
JournalAstrophysical Journal
Volume771
Issue number1
DOIs
StatePublished - Jul 1 2013

Keywords

  • ISM: individual objects (L1527)
  • protoplanetary disks
  • stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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