Results 1 to 10 of about 16,972 (217)

Microlensing of Circumstellar Disks [PDF]

open access: yesThe Astrophysical Journal, 2005
We investigate the microlensing effects on a source star surrounded by a circumstellar disk, as a function of wavelength. The microlensing light curve of the system encodes the geometry and surface brightness profile of the disk.
Brice Menard   +8 more
core   +2 more sources

Circumstellar Disks

open access: yes, 1999
This article is a tutorial on deriving physical properties from the spectral energy distributions of circumstellar disks. It includes a new derivation of disk mass from millimeter-wave flux density using recent disk model parameters.
Beckwith, Steven V. W.
core   +3 more sources

Circumstellar disks and planets. Science cases for next-generation optical/infrared long-baseline interferometers

open access: yesAstronomy and Astrophysics Review, 2012
We present a review of the interplay between the evolution of circumstellar disks and the formation of planets, both from the perspective of theoretical models and dedicated observations.
A Banzatti   +400 more
core   +4 more sources

Tracing episodic accretion with NOEMA: FU Orionis-type stars and their millimeter environment [PDF]

open access: yesEPJ Web of Conferences, 2022
The earliest phases of star formation are characterised by intense mass accretion from the circumstellar disk to the central star. One group of lowmass young stellar objects, FU Orionis-type stars (FUors) exhibit accretion rate peaks accompanied by ...
Fehér O.   +6 more
doaj   +1 more source

Vortices in Circumstellar Disks [PDF]

open access: yesThe 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

Prebiotic Synthesis and Isomerization in Interstellar Analog Ice: Glycinal, Acetamide, and Their Enol Tautomers

open access: yesAngewandte 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

Grain Growth and Dust Segregation Revealed by Multiwavelength Analysis of the Class I Protostellar Disk WL 17

open access: yesThe Astrophysical Journal, 2023
The first step toward planet formation is grain growth from (sub)micrometer to millimeter/centimeter sizes. Grain growth has been reported not only in Class II protoplanetary disks but also in Class 0/I protostellar envelopes.
Ilseung Han   +4 more
doaj   +1 more source

Dynamics of Circumstellar Disks [PDF]

open access: yesThe 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]

open access: yesAstronomy & 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

open access: yesAstronomische 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

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