H2CO Ortho-to-para Ratio in the Protoplanetary Disk HD 163296
نویسندگان
چکیده
منابع مشابه
Ringed Structures of the HD 163296 Protoplanetary Disk Revealed by ALMA.
We present Atacama Large Millimeter and Submillimeter Array observations of the protoplanetary disk around the Herbig Ae star HD 163296 that trace the spatial distribution of millimeter-sized particles and cold molecular gas on spatial scales as small as 25 astronomical units (A.U.). The image of the disk recorded in the 1.3 mm continuum emission reveals three dark concentric rings that indicat...
متن کاملThe Ratio of Ortho- to Para-H2 in Photodissociation Regions
We discuss the ratio of orthoto para-H2 in photodissociation regions (PDRs). We draw attention to an apparent confusion in the literature between the ortho-to-para ratio of molecules in FUV-pumped vibrationally excited states, and the total H2 ortho-to-para abundance ratio. These ratios are not the same because the process of FUV-pumping of fluorescent H2 emission in PDRs occurs via optically t...
متن کاملortho-to-para ratio in shocked molecular gas
We report the results of spectroscopic mapping observations carried out toward the Herbig-Haro objects HH7–11 and HH54 over the 5.2 − 37μm region using the Infrared Spectrograph of the Spitzer Space Telescope. These observations have led to the detection and mapping of the S(0) – S(7) pure rotational lines of molecular hydrogen, together with emissions in fine structure transitions of Ne, Si, S...
متن کاملThe Hd 163296 Circumstellar Disk in Scattered Light: Evidence of Time-variable Self-shadowing
We present the first multi-color view of the scattered light disk of the Herbig Ae star HD 163296, based on coronagraphic observations from the Hubble Space Telescope Advanced Camera for Surveys (ACS). Radial profile fits of the surface brightness along the disk’s semi-major axis indicates that the disk is not continuously flared, and extends to ∼540 AU. The disk’s color (V-I)=1.1 at a radial d...
متن کاملDust properties across the CO snowline in the HD 163296 disk from ALMA and VLA observations
Context. To characterize the mechanisms of planet formation it is crucial to investigate the properties and evolution of protoplanetary disks around young stars, where the initial conditions for the growth of planets are set. The high spatial resolution of Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G. Jansky Very Large Array (VLA) observations now allows the study of radial va...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2018
ISSN: 1538-4357
DOI: 10.3847/1538-4357/aad778