imaging Archives - Page 97 of 109 - Astrobiology

Voyager 2/ISS images of Uranus and Neptune released shortly after the Voyager 2 flybys in 1986 and 1989, respectively, compared with a reprocessing of the individual filter images in this study to determine the best estimate of the true colours of these planets. CREDIT Patrick Irwin.

Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Ice Giant, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Neptune, Press Release, Uranus

Calibrating Instruments For Exoplanets: What Neptune And Uranus Really Look Like

by Keith CowingJanuary 6, 2024May 12, 2025

Neptune is fondly known for being a rich blue and Uranus green – but a new study has revealed that the two ice giants are actually far closer in colour […]

Modeled EW of the He i λ10833 Å signal as a function of temperature and mass-loss rate at the terminator for the high irradiation scenario. The admissible region is indicated by connected blue circles. Similarly, admissible regions are indicated for the moderate irradiation scenario (white, F/100) and the substellar-point model in Roche-lobe overflow (RLO, triangles). -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

The Elusive Atmosphere Of WASP-12 b / High-resolution Transmission Spectroscopy With CARMENES

by Keith CowingJanuary 6, 2024January 6, 2024

To date, the hot Jupiter WASP-12 b has been the only planet with confirmed orbital decay. The late F-type host star has been hypothesized to be surrounded by a large […]

Images of microfossil specimens of Navifusa majensis. (Demoulin et al., Nature, 2024) [L] one of the microfossils with stacks of thylakoids highlighted using yellow bars [R] magnification of the end of the cell.

Biosignatures & Paleobiology, Fossils & Paleontology, Imaging & Spectroscopy, Microbiology & Virology, Origin & Evolution of Life, Plant Biology, Status Report

Fossil Cells Provide Evidence Of Early Oxygenic Photosynthesis On Earth

by Keith CowingJanuary 4, 2024January 4, 2024

Today oxygenic photosynthesis is unique to cyanobacteria and their plastid relatives within eukaryotes. Although its origin before the Great Oxidation Event is still debated 1,2,3,4, the accumulation of O2 profoundly […]

Spectral energy distribution and spectrum of 51 Eridani. The black line is the NGSL and SpeX spectrum, with grey regions indicating a model. Photometry is shown in red, with horizontal error bars indicating the width of the filter, while vertical show the photometric uncertainty. Synthetic photometry from the spectrum is shown in green. The bottom panel shows the difference between the spectrum and photometry in units of standard deviations. -- astro-ph.EP

Astrogeology, Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Measuring The Stellar And Planetary Properties Of The 51 Eridani System

by Keith CowingJanuary 4, 2024January 4, 2024

In order to study exoplanets, a comprehensive characterization of the fundamental properties of the host stars, such as angular diameter, temperature, luminosity, and age, is essential, as the formation and […]

Outcome after a 10 Myr simulation of a disk of planetesimals initially between 0.5 au and 45 au in the environment of β Pic b and β Pic c taken from solution #2 from Table 1, viewed from above. The red bullets show the location of the planets and the star, and the black dots are the remaining planetesimals. -- astro-ph.EP

Astronomy & Telescopes, Beta Pictoris, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Dynamics Of The Beta Pictoris Planetary System And Its Falling Evaporating Bodies

by Keith CowingJanuary 2, 2024January 14, 2024

For decades, the spectral variations of Beta Pictoris have been modelled as the result of the evaporation of exocomets close to the star, termed falling evaporating bodies (FEBs).

Kepler-1409b, as listed in the Kepler catalog, orbits its host star KID 12405333 with a period of 0.76486 days. This transit period has been precisely detected by the GPFC method. In the top panel, a clear transit signal is visible in the folded light curve at this identified period of p=0.76486 days. Meanwhile, the bottom panel reveals a peak CNN score of 0.99999964 at the same period, along with another notable score of 0.995469 at its harmonic half-period of p=0.38243. -- astro-ph.EP

AI - Data - Apps - Cybernetics, Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Discovery of Small Ultra-short-period Planets Orbiting KG Dwarfs in Kepler Survey Using GPU Phase Folding and Deep Learning Detection System

by Keith CowingJanuary 2, 2024January 2, 2024

Since the discovery of the first hot Jupiter orbiting a solar-type star, 51 Peg, in 1995, more than 4000 exoplanets have been identified using various observational techniques.

Representative Raman and nanoSIMS data collected in this study Across all panels data from two representative cells, “1” and “2”, are noted. Representative nanoSIMS isotopic images of are shown in Panel A, with pixel counts labeled on the x and y axes. From left to right, the pixel intensity in each panel corresponds to direct ion counts for 1 H- , 2 H- , and the fractional abundance of deuterium (2 F), respectively. The top row shows cells grown in 0% 2 H2O (natural abundance); the bottom row displays cells grown in 50 at. % 2 H2O. Representative single-cell fitted Raman spectra are shown in Panel B, with the characteristic C-H band between 2800 and 3000 cm-1 clearly visible. For cells grown in deuterated media (Cell 2), the C-D band emerges between 2040 and 2300 cm-1. Panel C displays a typical micrograph captured through a confocal Raman microspectroscope. The scale bar represents 2µm. Cells in all panels represent T. hydrogeniphilus. The yellow boxes in the top-left facet of Panel A, and Panel C, represent a correlated region imaged with nanoSIMS and Raman (reflected light), respectively. -- biorxiv.org

Biogeochemical Cycles & Geobiology, Biophysics, Exploration Gear & Tech, Genomics, Proteomics, Bioinformatics, Imaging & Spectroscopy, Microbiology & Virology, Nanotechnology & SynBio, Status Report, Tricorders & Sensors

Tricorder Tech: Quantitative Measurement Of Microbial Growth Rate With Raman Microspectroscopy

by Keith CowingDecember 28, 2023December 28, 2023

Rates of microbial activity and growth are fundamental to understanding environmental geochemistry and ecology.

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.

Map of normalized intensity, Ip/I∗, for the planet Kepler-7b based on orbital phase variations measured by the Kepler mission (adapted from Demory et al. 2013). The intensity is interpreted as reflected light, and hence is proportional to albedo, Ag = (Ip/I∗)(a/R∗) 2 , and the bright region on the planet’s western hemisphere has an albedo of 0.64, suggestive of reflective clouds (Sudarsky et al. 2000; Roman and Rauscher 2017). A possible explanation for the cloud pattern is that particles condense on the planet’s cooler nightside, are advected to the dayside by eastward winds, and sublimate when the star is overhead (Heng and Demory 2013; Parmentier et al. 2016). -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Status Report, Stellar Cartography

Mapping Exoplanets

by Keith CowingDecember 27, 2023February 16, 2024

The varied surfaces and atmospheres of planets make them interesting places to live, explore, and study from afar.

Mixtures Of Sulfates In Melas Chasma On Mars

Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Imaging & Spectroscopy, Mars, Status Report

Mixtures Of Sulfates In Melas Chasma On Mars

by Keith CowingDecember 26, 2023December 26, 2023

Many locations on Mars have sulfates, which are sedimentary rocks formed in water. Within Valles Marineris, the large canyon system that cuts across the planet, there are big and thick […]