Results 31 to 40 of about 606 (180)

Spectral Characterization of CO2‐H2O Ice Layering Under Controlled Mars Polar Conditions as Laboratory Analogs for Seasonal Cap Activity

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract Seasonal CO2 and H2O ice blanket the Martian polar caps, and their spectral contributions mix during seasonal evolution. Particularly in late northern winter, the spectral signature of H2O ice obscures that of CO2 ice. Using the MARVIN chamber at York University, we produced controlled analogs of layered polar ice under Mars‐like pressure (∼6 ...
Jamie A. Isen, Andrej Stojanovic, Wendy M. Calvin, Isaac B. Smith   +3 more
wiley   +1 more source

Observing Conditions for Submillimeter Astronomy

, 2011
© 2011 Instituto de Astronomía, UNAM. It is a pleasure to thank the many colleagues who have contributed to these measurements. Jeff Peterson initiated development of the 350 μm tippers. CCAT site evaluation is carried out in the Parque Astronómico Atacama in northern Chile under the auspices of the Programa de Astronomía, a program of the Comisión ...
openaire   +3 more sources

The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO). IV. Dust and Gas Disk Properties in the Upper Scorpius Star-forming Region

The Astrophysical Journal
The Atacama Large Millimeter/submillimeter Array (ALMA) large program AGE-PRO explores protoplanetary disk evolution by studying gas and dust across various ages.
Carolina Agurto-Gangas, Laura M. Pérez, Anibal Sierra, James Miley, Ke Zhang, Ilaria Pascucci, Paola Pinilla, Dingshan Deng, John Carpenter, Leon Trapman, Miguel Vioque, Giovanni P. Rosotti, Nicolas Kurtovic, Lucas A. Cieza, Rossella Anania, Benoît Tabone, Kamber Schwarz, Michiel R. Hogerheijde, Estephani E. TorresVillanueva, Dary A. Ruiz-Rodriguez, Camilo González-Ruilova   +20 more
doaj   +1 more source

The Quest for the Missing Dust. II. Two Orders of Magnitude of Evolution in the Dust-to-gas Ratio Resolved within Local Group Galaxies

The Astrophysical Journal, 2023
We explore evolution in the dust-to-gas ratio with density within four well-resolved Local Group galaxies—the LMC, SMC, M31, and M33. We do this using new Herschel maps, which restore extended emission that was missed by previous Herschel reductions ...
Christopher J. R. Clark, Julia C. Roman-Duval, Karl D. Gordon, Caroline Bot, Matthew W. L. Smith, Lea M. Z. Hagen   +5 more
doaj   +1 more source

CI chondrite Oued Chebeika 002 links asteroids Bennu and Ryugu to common parent body

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 801-818, May 2026.
Abstract CI chondrites are a compositionally primitive group of meteorites that have undergone extensive aqueous alteration, providing insights into the evolution of primitive planetesimals. Oued Chebeika 002 is the most pristine CI chondrite to date.
Megan Broussard, Katharina Lodders, Paul K. Carpenter, Piers Koefoed, Karen Ziegler, Kunihiko Nishiizumi, Marc W. Caffee, Laurence A. J. Garvie, Ryan C. Ogliore, Anthony J. Irving, Bradley L. Jolliff, Kun Wang   +11 more
wiley   +1 more source

Hydrogen Cyanide in Comet C/2022 E3 (ZTF) from 3.4 mm Wave Spectra

The Astronomical Journal
The composition inside a comet nuclear can be detected through the molecular rotational emission lines at millimeter or submillimeter wavelengths.
Juncen Li, Jianchun Shi, Yuehua Ma, Jixian Sun   +3 more
doaj   +1 more source

Ground‐Based Microwave Measurements of ClO and O3 Over Scott Base, Antarctica

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 7, 16 April 2026.
Abstract We present measurements from a new microwave instrument that has been deployed at Scott Base, Antarctica, primarily to measure ClO. The new instrument allows for the extension of the time series of lower stratospheric ClO measurements begun in 1996 at this site, while some of the technical improvements offer the possibility of making ...
Gerald E. Nedoluha, R. Michael Gomez, Ian Boyd, Helen Neal, Douglas R. Allen, Alan Parrish, Brian J. Connor, Michael Kotkamp, Kate McKenzie, Eric L. Fleming, Thomas F. Hanisco, Michelle L. Santee   +11 more
wiley   +1 more source

Integrated heterodyne array receivers for submillimeter astronomy [PDF]

SPIE Proceedings, 2003
The advent of large format (~100 pixel) spectroscopic imaging cameras at submillimeter wavelengths would fundamentally change the way in which astronomy is performed in this important wavelength regime. While the possibility of such instruments has been discussed for more than two decades, only recently have advances in mixer technology, device ...
Walker, C. K., Groppi, C. E., Drouet d'Aubigny, C., Kulesa, C., Hedden, A., Prober, D., Siddiqi, I., Kooi, J., Chen, G., Lichtenberger, A. W.   +9 more
openaire   +2 more sources

Photonic Crystal Fibers in the Terahertz Regime: Design Strategies, Performance Metrics, and Emerging Applications: A Systematic Review

Advanced Photonics Research, Volume 7, Issue 4, April 2026.
An optimized octagonal‐core terahertz (THz) photonic crystal fiber sensor is presented for accurate identification of different milk samples based on refractive index variation. The structure enables highly confined THz guidance and strong light–analyte interaction, allowing reliable discrimination of camel, cow, buffalo, and sheep milk.
A. H. M. Iftekharul Ferdous, Ahmmad Musha, Khalid Sifulla Noor   +2 more
wiley   +1 more source

The effect of early diagenetic processes on the quantification of fossil micrometeorite abundance and flux in the geological record

Meteoritics &Planetary Science, Volume 61, Issue 4, Page 551-564, April 2026.
Abstract Fossil micrometeorites (MMs) recovered from lithified sedimentary rocks, particularly iron‐rich (I‐type) cosmic spherules (CSs) provide valuable insights into past dust‐forming events. Their abundances, when combined with estimates of local sedimentation rates can be used to reconstruct the flux of extraterrestrial dust.
Isabelle S. Mattia, Matthew J. Genge, Martin D. Suttle   +2 more
wiley   +1 more source