Ammonia Archives - Page 2 of 2 - Astrobiology

Total atmospheric surface pressure (bar) and volume mixing ratio of NH3, and CO2 output from the atmospheremagma ocean system over the parameter space which we have sampled, outlined in table 1. This corresponds to the output of step 2 in the schematic presented in figure 1. Points are colour-coded by the log of the planetary hydrogen budget, in units part-per-million of the planetary mass. Histograms of the distribution of NH3 mixing ratios (top left), CO2 mixing ratios (top right) and total surface pressures (lower right) from across the model runs are shown alongside. -- astro-ph.EP

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Lava / magma ocean / Volcanic Worlds, Status Report, Water/Hycean Worlds & Oceanography

Distinguishing Oceans Of Water From Magma On Mini-Neptune K2-18b

by Keith CowingJanuary 12, 2024May 11, 2024

Mildly rradiated mini-Neptunes have densities potentially consistent with them hosting substantial liquid water oceans (`Hycean’ planets).

SCT-determined column-averaged ammonia mole fraction in the GRS region separated by one week in time. Top: 2022-10-13 03:45UT; bottom: 2022-10-20 04:40UT. Large scale features persist, but smaller scale features show changes. While these changes may be physical, they may also represent indications of noise. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Jupiter, Status Report

Spatial Variations of Jovian Tropospheric Ammonia via Ground-Based Imaging

by Keith CowingDecember 27, 2023December 27, 2023

Optical bandpass-filter observations can be simply processed to determine similar horizontal ammonia distributions above the Jovian cloud tops as mid-infrared and microwave observations.

The NH3 integrated intensity map of KAG71 in contours over the Herschel/SPIRE 250 µm dust continuum image. The black polygon outlines the mapping area of the NH3 observations. The labels (a) – (c) indicate the positions for the spectra of figures 2-(a) to (c). The lowest contour and contour steps are 0.2 K km s−1 and 0.4 K km s−1, respectively. The Nobeyama 45 m beam size at 23 GHz is indicated by the grey filled circle shown in the lower left corner. (Color online) -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Status Report

KAgoshima Galactic Object Survey With Nobeyama 45-metre Telescope by Mapping in Ammonia Lines (KAGONMA): Discovery of Parsec-scale CO Depletion in the Canis Major Star-forming Region

by Keith CowingNovember 19, 2023November 19, 2023

In observational studies of infrared dark clouds, the number of detections of CO freeze-out onto dust grains (CO depletion) at pc-scale is extremely limited, and the conditions for its occurrence […]

Artistic impression of brown dwarf WISE J1828, one of the coldest gas giants know outside of our Solar System. Its atmosphere is dominated by the absorption from water, methane and ammonia vapour. -- ETH Zurich

Astrochemistry, Brown Dwarfs, Exoplanets, -moons, -comets, Press Release

An Ammonia Trail To Exoplanets

by Keith CowingNovember 7, 2023April 14, 2026

They reveal the origin of wine, the age of bones and fossils, and they serve as diagnostic tools in medicine. Isotopes and isotopologues – molecules that differ only in the […]

Ammonia

Biosignatures & Paleobiology, Habitable Zones, Press Release, Venus

Ammonia And Phosphine In The Clouds Of Venus As Potentially Biological Anomalies

by Keith CowingNovember 16, 2022November 16, 2022

We are of the opinion that several anomalies in the atmosphere of Venus provide evidence of yet-unknown processes and systems that are out of equilibrium.

Molecular

Astrochemistry, Astrogeology, Press Release, Titan

Molecular Structure, Dynamics, and Vibrational Spectroscopy of the Acetylene:Ammonia (1:1) Plastic Co-Crystal at Titan Conditions

by Keith CowingOctober 25, 2022October 25, 2022

The Saturnian moon Titan has a thick, organic-rich atmosphere, and condensed phases of small organic molecules are anticipated to be stable on its surface.

Ammonia

Astrochemistry, Astronomy & Telescopes, Press Release

Ammonia In The Interstellar Medium Of A Starbursting Disc At z=2.6

by Keith CowingSeptember 20, 2022

We report the detection of the ground state rotational emission of ammonia, ortho-NH3 (JK=10→00) in a gravitationally lensed, intrinsically hyperluminous, star-bursting galaxy at z=2.6. The integrated line profile is consistent […]