Article
Astronomy & Astrophysics
B. Charnay, G. Tobie, S. Lebonnois, R. D. Lorenz
Summary: By studying Titan's atmosphere, the Dragonfly mission can provide valuable constraints on the interior of Titan.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Rengel, D. Shulyak, P. Hartogh, H. Sagawa, R. Moreno, C. Jarchow, D. Breitschwerdt
Summary: The aim of this study was to measure the vertical distribution of HCN on Titan's stratosphere using ground-based submillimetre observations acquired quasi-simultaneously with the Herschel ones. The results showed consistent HCN abundance profiles and provided valuable information for the improvement of photochemical models. The study received a score of 9 out of 10 for its importance in understanding the vertical distribution of HCN in Titan's stratosphere.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
N. L. Rossignoli, R. P. Di Sisto, M. G. Parisi
Summary: By studying the impact crater counts and erosion processes on Titan, we can estimate its surface age and understand the role of centaur objects in impacts.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
X. J. Xi, A. Vienne
Summary: This study aims to construct new synthetic representations of the JPL Titan ephemeris in order to obtain the complete combinations of the osculating elements. By using an analytical representation method, the advantages of both the TASS system and the high precision of JPL can be achieved.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Zeqi Zhang, Ravindra T. Desai, Yohei Miyake, Hideyuki Usui, Oleg Shebanits
Summary: This study investigates the spacecraft-plasma interaction during Cassini's Grand Finale, revealing complex features like electron wings and spacecraft-scale vortices in the wake. The results show that a high concentration of negative ions and dust can drive the spacecraft to positive potentials, with electron properties and magnetic field orientation playing significant roles in determining the spacecraft potential.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
N. Erkaev, M. Scherf, S. E. Thaller, H. Lammer, A. Mezentsev, V. A. Ivanov, K. E. Mandt
Summary: The study suggests that significant thermal escape of nitrogen on Titan likely occurred very early in its history with high solar extreme ultraviolet fluxes, impacting its atmospheric mass significantly. The origin of Titan's nitrogen, partially through NH3-ices, might be influenced by the Sun's rotational evolution, with implications for the survival of the atmosphere and potential nitrogen sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Lorenzo Iorio, Athul Pradeepkumar Girija, Daniele Durante
Summary: In recent years, there has been a growing interest in sending a mission to Uranus, which has only been visited by Voyager 2 in 1986. The Elliptical Uranian Relativity Orbiter is investigating the possibility of measuring the planet's angular momentum by studying the Lense-Thirring effect on a potential orbiter. By choosing an appropriate orbital configuration, it is possible to separate the relativistic precessions from the classical rates induced by the planet's gravity field. The uncertainties in the orientation of the planetary spin axis and the inclination are the main sources of systematic bias and need to be determined accurately.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Benno A. Neuenschwander, Ravit Helled
Summary: This paper presents empirical structure models of Uranus and Neptune and predicts their rotation periods and wind depths by using higher order gravitational coefficients. The study finds that faster rotation and deep winds favor centrally concentrated density distributions. Accurate measurements of the gravity field and moment of inertia can constrain their internal structures and wind depths.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Eric Gaidos, Teruyuki Hirano, Rena A. Lee, Hiroki Harakawa, Klaus Hodapp, Shane Jacobson, Takayuki Kotani, Tomoyuki Kudo, Takashi Kurokawa, Masayuki Kuzuhara, Jun Nishikawa, Masashi Omiya, Takuma Serizawa, Motohide Tamura, Akitoshi Ueda, Sebastien Vievard
Summary: We report on the search for excess absorption in the ortho (triplet) helium 1083.2 nm line during the transits of TOI-1807b and TOI-2076b. The absence of a H/He signature for TOI-1807b may indicate a rocky body, while the Hei-like feature observed during the transit of TOI-2076b is likely due to stellar activity. Future surveys could potentially benefit from utilizing a distance criterion for increased detections.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Cathal Maguire, Neale P. Gibson, Stevanus K. Nugroho, Swaetha Ramkumar, Mark Fortune, Stephanie R. Merritt, Ernst de Mooij
Summary: Recent progress in high-resolution transmission spectroscopy allows for the characterization of exoplanet atmospheres, detecting molecules/atoms and mapping atmospheric dynamics. Multiple observations of the ultrahot Jupiter WASP-121b using the Very Large Telescope/Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) provide consistent results for relative abundances of neutral metals and planetary orbital velocities. The study's findings are in agreement with previous observations and could contribute to understanding planet formation processes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yutian Cao, Dandan Niu, Wenjun Liang, Jun Cui, Xiaoshu Wu, Xin Wan, Jiahao Zhong, Lei Li, Zhaojin Rong, Yong Wei
Summary: Thermal electron depression and energetic electron depletion are observed in the nightside Martian ionosphere. While energetic electron depletion has been extensively studied, there is limited research on thermal electron depression and the correlation between the two is unknown. Through Mars Express total electron content (TEC) measurements, a large number of TEC depression features are identified, with large amplitude depression being more frequently observed near strong magnetic fields and small amplitude depression uniformly distributed across the Martian surface.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ludwig Scheibe, Nadine Nettelmann, Ronald Redmer
Summary: Thermal evolution models of Uranus and Neptune suggest that their luminosities are inconsistent with the classical assumption of an adiabatic interior, with the influence of a thermally conductive boundary layer being a significant factor. Even a thin conductive layer of a few kilometers can greatly affect planetary cooling, resulting in either brighter or fainter appearances compared to the adiabatic case. The models also indicate that Uranus may have been in equilibrium with solar flux for a longer period of time.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Richard Hobbs, Paul B. Rimmer, Oliver Shorttle, Nikku Madhusudhan
Summary: A new network of atmospheric sulfur reactions was proposed and validated, showing significant impact on gas mixing ratios under specific conditions and causing major changes in the abundance of specific species. Accurate understanding of sulfur chemistry in hot and warm Jupiter atmospheres requires experimental measurements of reaction rates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Xu Huang, Hao Gu, Jun Cui, Xiaoshu Wu, Mingyang Sun
Summary: This study evaluates the effects of the 2018 global dust storm on the photochemical escape of atomic C, N, and O on Mars. It uses multi-instrument measurements and a one-dimensional Monte Carlo model to calculate the escape probability profile and derive the photochemical escape rates. The results show that the GDS-induced C, N, and O escape is generally reduced by about 30-40% compared to the pre-GDS state, contrary to the well-known result of GDS-induced strong enhancement of atomic H escape.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Menghao Fu, Hao Gu, Jun Cui, Zhiyong Xiao, Fei He, Yong Wei, Zhipeng Ren
Summary: This study focuses on modeling the water-rich plume erupting from 'tiger stripes' near Enceladus south polar region, using CO2 distribution extracted from Cassini measurements. The analysis reveals a complex spatio-temporal variability in plume structure, with varying source rate and Mach number among different sources and flybys. The identification of a correlation between Mach number and thermal brightness provides insights into the nature of geyser emission along the 'tiger stripes'.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Meteorology & Atmospheric Sciences
John T. Sullivan, Timothy Berkoff, Guillaume Gronoff, Travis Knepp, Margaret Pippin, Danette Allen, Laurence Twigg, Robert Swap, Maria Tzortziou, Anne M. Thompson, Ryan M. Stauffer, Glenn M. Wolfe, James Flynn, Sally E. Pusede, Laura M. Judd, William Moore, Barry D. Baker, Jay Al-Saadi, Thomas J. McGee
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2019)
Review
Astronomy & Astrophysics
V. S. Airapetian, R. Barnes, O. Cohen, G. A. Collinson, W. C. Danchi, C. F. Dong, A. D. Del Genio, K. France, K. Garcia-Sage, A. Glocer, N. Gopalswamy, J. L. Grenfell, G. Gronoff, M. Guedel, K. Herbst, W. G. Henning, C. H. Jackman, M. Jin, C. P. Johnstone, L. Kaltenegger, C. D. Kay, K. Kobayashi, W. Kuang, G. Li, B. J. Lynch, T. Lueftinger, J. G. Luhmann, H. Maehara, M. G. Mlynczak, Y. Notsu, R. A. Osten, R. M. Ramirez, S. Rugheimer, M. Scheucher, J. E. Schlieder, K. Shibata, C. Sousa-Silva, V Stamenkovic, R. J. Strangeway, A. Usmanov, P. Vergados, O. P. Verkhoglyadova, A. A. Vidotto, M. Voytek, M. J. Way, G. P. Zank, Y. Yamashiki
INTERNATIONAL JOURNAL OF ASTROBIOLOGY
(2020)
Article
Astronomy & Astrophysics
G. Gronoff, P. Arras, S. Baraka, J. M. Bell, G. Cessateur, O. Cohen, S. M. Curry, J. J. Drake, M. Elrod, J. Erwin, K. Garcia-Sage, C. Garraffo, A. Glocer, N. G. Heavens, K. Lovato, R. Maggiolo, C. D. Parkinson, C. Simon Wedlund, D. R. Weimer, W. B. Moore
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2020)
Article
Geochemistry & Geophysics
F. Da Pieve, G. Gronoff, J. Guo, C. J. Mertens, L. Neary, B. Gu, N. E. Koval, J. Kohanoff, A. C. Vandaele, F. Cleri
Summary: This study investigates the radiation environment induced by galactic and solar radiation at Oxia Planum and Mawrth Vallis on Mars, revealing similar conditions at different sites during solar minimum and maximum, with slightly enhanced gamma-ray contribution in water-rich regolith. The exposure estimates for different locations show reasonable to large safety margins for long stays and low risk for short stays, with the influence of ground composition on radiation levels highlighted.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Environmental Sciences
G. Gronoff, T. Berkoff, K. E. Knowland, L. Lei, M. Shook, B. Fabbri, W. Carrion, A. O. Langford
Summary: A study detected a stratospheric intrusion event above Hampton, Virginia using NASA's LMOL and MPL instruments, with the GEOS-CF model confirming the stratospheric origin of the air mass. The research showed that particulate observations could potentially be used as a signature of stratospheric intrusions and that the LMOL system has the capability to detect such events.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Maxim H. Couillard, Margaret J. Schwab, James J. Schwab, Cheng-Hsuan (Sarah) Lu, Everette Joseph, Brennan Stutsrim, Bhupal Shrestha, Jie Zhang, Travis N. Knepp, Guillaume P. Gronoff
Summary: This study focused on the vertical distribution of ozone in the troposphere near central Long Island, highlighting the importance of measuring ozone aloft for a comprehensive understanding of ozone production and transport. Analysis revealed that high ozone levels in the lower troposphere are often observed on hot, sunny days with high-pressure systems, leading to the presence of distinct layers with significant ozone excursions over short vertical distances. Meteorological processes at both synoptic and local scales were found to play a crucial role in shaping the observed vertical ozone profiles.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Environmental Sciences
Alexander Kotsakis, John T. Sullivan, Thomas F. Hanisco, Robert J. Swap, Vanessa Caicedo, Timothy A. Berkoff, Guillaume Gronoff, Christopher P. Loughner, Xinrong Ren, Winston T. Luke, Paul Kelley, Phillip R. Stratton, Ruben Delgado, Nader Abuhassan, Lena Shalaby, Fernando C. Santos, Joel Dreessen
Summary: This study aims to quantify the mechanisms affecting trace gas amounts between land and water in coastal environments and investigates the impact of sea/bay breeze on air quality. Through modeling and data analysis, the study reveals the variations and sources of trace gases under different meteorological conditions.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Astronomy & Astrophysics
C. J. Mertens, G. P. Gronoff, Y. Zheng, M. Petrenko, J. Buhler, D. Phoenix, E. Willis, I. Jun, J. Minow
Summary: The Nowcast of Aerospace Ionizing RAdiation System (NAIRAS) version 3 model is now available to the community through the run-on-request service. Users can customize the model for different applications and time periods using two run options. The model provides global context and situational awareness of the atmospheric ionizing radiation environment, as well as detailed characterization of radiation exposure during flight and assessment of single event effects in aircraft and spacecraft electronic systems.
SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Glyn A. Collinson, Rudy A. Frahm, Alex Glocer, Lars Daldorff, Ed Thiemann, Suk-Bin Kang, Guillaume Gronoff, Yoshifumi Futaana, Tielong Zhang
Summary: Venus has a stronger electrical potential in its ionosphere than expected, which is important for understanding the habitability of terrestrial planets. Further research is needed to fully understand this phenomenon as the existing studies are limited to individual measurements.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Claudia Bernier, Yuxuan Wang, Guillaume Gronoff, Timothy Berkoff, K. Emma Knowland, John T. Sullivan, Ruben Delgado, Vanessa Caicedo, Brian Carroll
Summary: This study uses multi-dimensional measurements from ozone lidar, along with two different chemical transport models (CTMs), to investigate the vertical and temporal variability of coastal ozone. Clustering analysis results in five different ozone profile curtain clusters, which are used to evaluate the performance of the CTMs. Overall evaluation shows good agreement in the low-level altitude range, but significant differences at mid-level altitudes.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
Liqiao Lei, Timothy A. Berkoff, Guillaume Gronoff, Jia Su, Amin R. Nehrir, Yonghua Wu, Fred Moshary, Shi Kuang
Summary: Aerosols emitted from wildfires are a major source of poor air quality in the US mainland, but are difficult to monitor accurately using lidar techniques. This study improved the characterization of lidar ratios for UVB aerosol retrieval and evaluated the optical properties of aerosols affected by wildfire emissions in the lower troposphere. The research enables better monitoring and correction of aerosol impact on O-3 lidar data.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2022)
Article
Meteorology & Atmospheric Sciences
Jia Su, M. Patrick McCormick, Matthew S. Johnson, John T. Sullivan, Michael J. Newchurch, Timothy A. Berkoff, Shi Kuang, Guillaume P. Gronoff
Summary: A novel three-wavelength DIAL technique is proposed for more accurate measurements of NO2 with lower retrieval uncertainties compared to the traditional two-wavelength method. The study indicates that the three-wavelength DIAL technique can reduce fluctuations caused by aerosol backscattering. Additionally, NO2 profiles retrieved using this technique show similar vertical structures and magnitudes to modeled profiles.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2021)
Article
Astronomy & Astrophysics
R. Maggiolo, G. Gronoff, G. Cessateur, W. B. Moore, V. S. Airapetian, J. De Keyser, F. Dhooghe, A. Gibbons, H. Gunell, C. J. Mertens, M. Rubin, S. Hosseini
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
G. Gronoff, R. Maggiolo, G. Cessateur, W. B. Moore, V. Airapetian, J. De Keyser, F. Dhooghe, A. Gibbons, H. Gunell, C. J. Mertens, M. Rubin, S. Hosseini
ASTROPHYSICAL JOURNAL
(2020)
Article
Meteorology & Atmospheric Sciences
Betsy M. Farris, Guillaume P. Gronoff, William Carrion, Travis Knepp, Margaret Pippin, Timothy A. Berkoff
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2019)