منابع مشابه
The Signature of Primordial Grain Growth in the Polarized Light of the Au Mic Debris Disk
We have used the coronagraphic mode of the Advanced Camera for Surveys aboard the Hubble Space Telescope to make the first polarization maps of the debris disk surrounding the nearby M star AU Microscopii (GJ 803). The linear polarization of the scattered light from the disk is unambiguously detected. We find that the degree of polarization for the disk rises monotonically from about 0.05 to 0....
متن کاملOn the AU Mic Debris Disk Density Profiles , Grain Properties and Dust Dynamics
Context. AU Mic is a young M-type star surrounded by an edge-on optically thin debris disk that shares many common observational properties with the disk around β Pictoris. In particular, the scattered light surface brightness profile falls off as ∼ r −5 outside 120 AU for β Pictoris and 35 AU for AU Mic. In both cases, the disk color raises with increasing distance beyond these reference radii...
متن کاملOpacity in the upper atmosphere of AU Mic
In this paper we investigate the validity of the optically thin assumption in the transition region of the late–type star AU Mic. We use Far–Ultraviolet Spectroscopic Explorer (FUSE) observations of the C multiplet and O resonance lines, hence yielding information at two different levels within the atmosphere. Significant deviations from the optically thin fluxes are found for C in b...
متن کاملDust Dynamics and Surface Brightness Profiles of Debris Disks: The Case of AU Mic
AU Microscopii is a 12-Myr-old M dwarf that harbors an optically thin disk of dust. Within a projected distance b from the star of 43 AU—in the “inner disk”— the scattered-light surface brightness falls as b, where α ≈ 1–2. In the “outer disk,” outside 43 AU, the brightness drops more steeply, with α ≈ 4–5. We devise a theory to explain the entire profile, including the break. Our theory assert...
متن کاملDust Dynamics, Surface Brightness Profiles, and Thermal Spectra of Debris Disks: The Case of AU Mic
AU Microscopii is a 12-Myr-old M dwarf that harbors an optically thin disk of dust viewed nearly edge-on. Within a projected distance b from the star of 43 AU, the scattered-light surface brightness falls as b, where α ≈ 1–2. Outside 43 AU, the brightness drops more steeply, with α ≈ 4–5. We devise a theory to explain the entire profile, including the break. Our theory asserts that the AU Mic d...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2020
ISSN: 2041-8213
DOI: 10.3847/2041-8213/ab65bb