Results 31 to 40 of about 362,838 (268)
The Astrophysical Journal Supplement Series, 2023 Astronomical observations of the polarized intensity of scattered visible light have revealed the presence of dust envelopes around different types of evolved stars.
Juan Carlos Gómez Martín +10 more
doaj +1 more source
Alumina Polymorphism in the Circumstellar Dust Shells of Asymptotic Giant Branch Stars
Astrophysical Journal, 2018 Many emission features remain unidentified in the infrared spectra of asymptotic giant branch (AGB) stars. In particular, features at ∼11, 20, 28, and 32 μm have been noted in mid-infrared spectra of oxygen-rich AGB stars.
B. Sargent
semanticscholar +1 more source
The Circumstellar Disk HD 169142: Gas, Dust, and Planets Acting in Concert? [PDF]
, 2017 HD 169142 is an excellent target for investigating signs of planet–disk interaction due to previous evidence of gap structures. We perform J-band (∼1.2 μm) polarized intensity imaging of HD 169142 with VLT/SPHERE.
A. Pohl +36 more
semanticscholar +1 more source
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
International Journal of Chemical Kinetics, Volume 55, Issue 7, Page 381-391, July 2023., 2023 Abstract A number of amides, RC(O)NH2, have been detected spectroscopically in the space between the stars. Naturally the study of how these are formed is an important question on the path of chemical evolution from the elements C, H, N, O, P, … to life because the so‐called peptide‐bond −C(O)−NH− is a key linkage in poly‐amino acids or proteins.
Judith Würmel, John M. Simmie
wiley +1 more source
From Dust to Nanodust: Resolving Circumstellar Dust from the Colliding-wind Binary Wolf-Rayet 140
The Astrophysical Journal, 2023 Wolf-Rayet (WR) 140 is the archetypal periodic dust-forming colliding-wind binary that hosts a carbon-rich WR (WC) star and an O-star companion with an orbital period of 7.93 yr and an orbital eccentricity of 0.9.
Ryan M. Lau +19 more
doaj +1 more source
Analysis of Methods for Computing the Trajectories of Dust Particles in a Gas–Dust Circumstellar Disk [PDF]
, 2017 A systematic analysis ofmethods for computing the trajectories of solid-phase particles applied in modern astrophysics codes designed for modeling gas–dust circumstellar disks has been carried out for the first time.
O. Stoyanovskaya +2 more
semanticscholar +1 more source
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 +1 more source
Circumstellar Dust Disks in Taurus-Auriga: The Submillimeter Perspective [PDF]
, 2005 We present a sensitive, multiwavelength submillimeter continuum survey of 153 young stellar objects in the Taurus-Auriga star formation region. The submillimeter detection rate is 61% to a completeness limit of ~10 mJy (3 σ) at 850 μm.
S. Andrews, Jonathan P. Williams
semanticscholar +1 more source
Early gray dust formation in the type IIn SN 2005ip [PDF]
, 2018 The physical characteristics of dust formed in supernovae is poorly known. In this paper, we investigate the extinction properties of dust formed in the type IIn SN 2005ip.
Gall, Christa +2 more
core +3 more sources