Astronomy and Astrophysics, volume 615A, 95-95 (2018/7-1)
Resolved millimeter-dust continuum cavity around the very low mass young star CIDA 1.
PINILLA P., NATTA A., MANARA C.F., RICCI L., SCHOLZ A. and TESTI L.
Abstract (from CDS):
Context. Transition disks (TDs) are circumstellar disks with inner regions highly depleted in dust. TDs are observed in a small fraction of disk-bearing objects at ages of 1-10Myr. They are important laboratories to study evolutionary effects in disks, from photoevaporation to planet-disk interactions. Aim. We report the discovery of a large inner dust-empty region in the disk around the very low mass star CIDA 1 (M*∼0.1-0.2M☉).
Methods. We used ALMA continuum observations at 887 um, which provide a spatial resolution of 0.21"x0.12" (∼15x8au in radius at 140pc).
Results. The data show a dusty ring with a clear cavity of radius ∼20au, the typical characteristic of a TD. The emission in the ring is well described by a narrow Gaussian profile. The dust mass in the disk is ∼17M⊕. CIDA 1 is one of the lowest mass stars with a clearly detected millimeter cavity. When compared to objects of similar stellar mass, it has a relatively massive dusty disk (less than ∼5% of Taurus Class II disks in Taurus have a ratio of Mdisk/M* larger than CIDA 1) and a very high mass accretion rate (CIDA 1 is a disk with one of the lowest values of Mdisk/M ever observed). In light of these unusual parameters, we discuss a number of possible mechanisms that can be responsible for the formation of the dust cavity (e.g. photoevaporation, dead zones, embedded planets, close binary). We find that an embedded planet of a Saturn mass or a close binary are the most likely possibilities.
© ESO 2018
accretion, accretion disks - stars: pre-main sequence - planetary systems - protoplanetary disks
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