No evidence of the significant grain growth but tentative discovery of disk substructure in a disk around the Class I Protostar L1489 IRS

Abstract

For revealing the first step of the plant formation, it is important to understand how and when dust grains become larger in a disk around a protostar. To investigate the grain growth, we analyze dust continuum emission toward a disk around the Class I protostar, L1489 IRS at 0.9 and 1.3 mm wavelengths obtained by the Atacama Large Millimeter/submillimeter Array. The dust continuum emission extends to a disk radius ($r$) of $r\sim 300$ au, and the spectral index ($\alpha$) is derived to be $\alpha \sim 3.6$ at a radius of $r\sim 100-300$ au, as similar to the interstellar dust. Therefore, the grain growth does not occur significantly in the outer disk ($r\sim 100-300$ au). Furthermore, we tentatively identify a ring-like substructure at $r\sim 90$ au even though the spatial resolution and sensitivity are not enough to determine this structure. If this is the real ring structure, the ring position and small dust in the disk outer part are consistent with the idea of the growth front. These results suggest that the L1489 protostellar disk may be the beginning of the planet formation.

8 pages, 5 figures, Accepted for publication in ApJ

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Cited by in corpus (9)

• Early Planet Formation in Embedded Disks (eDisk). I. Overview of the Program and First Results
• Early Planet Formation in Embedded Disks (eDisk). IV. The Ringed and Warped Structure of the Disk around the Class I Protostar L1489 IRS
• Dust hot spots at 10 au scales around the Class 0 binary IRAS 16293-2422 A: a departure from the passive irradiation model
• Early Planet Formation in Embedded Disks (eDisk) V: Possible Annular Substructure in a Circumstellar Disk in the Ced110 IRS4 System
• Accuracy of ALMA estimates of young disk radii and masses. Predicted observations from numerical simulations
• Grain Growth During Protostellar Disk Formation
• Anatomy of the Class I protostar L1489 IRS with NOEMA -- I. Disk, streamers, outflow(s) and bubbles at 3mm
• A millimeter-multiwavelength continuum study of VLA 1623 West
• CAMPOS II. The onset of protostellar disk substructures and planet formation