Results 11 to 20 of about 2,019 (232)
Polarization of Circumstellar Debris Disk Light Echoes
The Astronomical JournalLight echoes of debris disks around active stars can reveal disk structure and composition even when disks are not spatially resolved. Unfortunately, distinguishing reflected light from quiescent starlight and unexpected post-peak flare structure is ...
Austin J. King +3 more
doaj +3 more sources
Dust in circumstellar disks [PDF]
, 2006 This thesis presents observational and theoretical studies of the size and spatial distribution of dust particles in circumstellar disks. Using millimetre interferometric observations of optically thick disks around T Tauri stars, I provide conclusive evidence for the presence of millimetre- to centimetre-sized dust aggregates.
J. Rodmann
openalex +3 more sources
CO2 Ocean Bistability on Terrestrial Exoplanets. [PDF]
J Geophys Res Planets, 2022 Abstract Cycling of carbon dioxide between the atmosphere and interior of rocky planets can stabilize global climate and enable planetary surface temperatures above freezing over geologic time. However, variations in global carbon budget and unstable feedback cycles between planetary sub‐systems may destabilize the climate of rocky exoplanets toward ...
Graham RJ +2 more
europepmc +2 more sources
Angewandte Chemie, Volume 135, Issue 12, March 13, 2023., 2023 Out of the cold: Ammonia (NH3) and acetaldehyde (CH3CHO) are exposed to galactic cosmic ray proxies while frozen at 5 K to simulate the environment of an interstellar molecular cloud. Reactants undergo dissociation and radical recombination to produce glycinal (NH2CH2CHO) and acetamide (CH3CONH2) prior to tautomerization to 2‐aminoethenol (HOCHCHNH2 ...
Joshua H. Marks +5 more
wiley +2 more sources
Vortices in Circumstellar Disks [PDF]
The Astrophysical Journal, 1995 Comment: uuencoded compressed PostScript file containing 30 pages. 5 figures available upon request. Submitted to ApJ.
Adams, Fred, Watkins, Richard
openaire +2 more sources
Circumstellar disks and planets [PDF]
Astronomy and Astrophysics Review, 2012 S. Wolf +12 more
openalex +2 more sources
Dynamics of Circumstellar Disks [PDF]
The Astrophysical Journal, 1998 We present a series of 2-dimensional hydrodynamic simulations of massive disks around protostars. We simulate the same physical problem using both a `Piecewise Parabolic Method' (PPM) code and a `Smoothed Particle Hydrodynamic' (SPH) code, and analyze their differences.
Nelson, Andrew F. +3 more
openaire +2 more sources
Turbulence in circumstellar disks [PDF]
Astronomy & Astrophysics, 2004 We investigate the analogy between circumstellar disks and the Taylor-Couette flow. Using the Reynolds similarity principle, the analogy results in a number of parameter-free predictions about stability of the disks, and their turbulent transport properties, provided the disk structure is available.
Hersant, Franck +2 more
openaire +4 more sources
Evaluating the GeoSnap 13‐μ$$ \mu $$m cutoff HgCdTe detector for mid‐IR ground‐based astronomy
Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023 Abstract New mid‐infrared HgCdTe (MCT) detector arrays developed in collaboration with Teledyne Imaging Sensors (TIS) have paved the way for improved 10‐μ$$ \mu $$m sensors for space‐ and ground‐based observatories. Building on the successful development of longwave HAWAII‐2RGs for space missions such as NEO Surveyor, we characterize the first 13‐μ ...
Jarron M. Leisenring +15 more
wiley +1 more source
First Observations With a GNSS Antenna to Radio Telescope Interferometer
Radio Science, Volume 58, Issue 8, August 2023., 2023 Abstract We describe the design of a radio interferometer composed of a Global Navigation Satellite Systems (GNSS) antenna and a Very Long Baseline Interferometry radio telescope. Our eventual goal is to use this interferometer for geodetic applications including local tie measurements.
J. Skeens +7 more
wiley +1 more source