Results 11 to 20 of about 586 (186)
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
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
CO2 Ocean Bistability on Terrestrial Exoplanets
Journal of Geophysical Research: Planets, Volume 127, Issue 10, October 2022., 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 ...
R. J. Graham +2 more
wiley +1 more source
Molecular content of the circumstellar disk in AB Aurigae [PDF]
Astronomy & Astrophysics, 2010 5 pages, 4 ...
Fuente, A. +6 more
openaire +3 more sources
Mass Accretion Processes in Young Stellar Objects: Role of Intense Flaring Activity
Acta Polytechnica CTU Proceedings, 2014 According to the magnetospheric accretion scenario, young low-mass stars are surrounded by circumstellar disks which they interact with through accretion of mass. The accretion builds up the star to its nal mass and is also believed to power the mass out
Salvatore Orlando +3 more
doaj +1 more source
Constraining the Earliest Circumstellar Disks and Their Envelopes [PDF]
The Astrophysical Journal, 2008 23 pages, 4 figures, accepted for publication in the Astrophysical ...
Chiang, Hsin-Fang +4 more
openaire +2 more sources
MIGRATION OF PLANETS EMBEDDED IN A CIRCUMSTELLAR DISK [PDF]
The Astrophysical Journal, 2011 Planetary migration poses a serious challenge to theories of planet formation. In gaseous and planetesimal disks, migration can remove planets as quickly as they form. To explore migration in a planetesimal disk, we combine analytic and numerical approaches. After deriving general analytic migration rates for isolated planets, we use N-body simulations
Bromley, Benjamin C., Kenyon, Scott J.
openaire +2 more sources
Chemical History of Molecules in Circumstellar Disks [PDF]
Proceedings of the International Astronomical Union, 2011 AbstractThe chemical composition of a protoplanetary disk is determined not only by in situ chemical processes during the disk phase, but also by the history of the gas and dust before it accreted from the natal envelope. In order to understand the disk's chemical composition at the time of planet formation, especially in the midplane, one has to go ...
Visser, R., Van Dishoeck, E., Doty, S.
openaire +3 more sources
Azimuthal Patterns in Planetesimal Circumstellar Disks
Astronomy Letters, 2023 24 pages, 8 figures.
Demidova, Tatiana V. +1 more
openaire +2 more sources