Article
Multidisciplinary Sciences
Maggie A. Thompson, Joshua Krissansen-Totton, Nicholas Wogan, Myriam Telus, Jonathan J. Fortney
Summary: Methane has been proposed as a potential biosignature for exoplanets, but it is important to consider the specific planetary conditions. Methane has a short lifetime in terrestrial planet atmospheres and requires large replenishment fluxes. While methane can be produced abiotically, known abiotic processes cannot easily generate atmospheres rich in methane and carbon dioxide with limited carbon monoxide. Therefore, planets with certain conditions are more likely to have biogenic methane.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Astronomy & Astrophysics
Ryoichi Koga, Tatsuya Suzuki, Fuminori Tsuchiya, Takeshi Sakanoi, Yasuhiro Hirahara
Summary: By analyzing ALMA archive data, the study detected the submillimeter spectrum of SO2 gas from volcanic plumes and lava areas on Jupiter's moon Io, with high intensity areas of SO2 found to be associated with volcanically active regions. Column densities and temperature changes before and after eclipse suggest volcanic eruptions maintain the atmosphere, while atmospheric SO2 around Janus Patera may be supplied by evaporation from lava areas after eclipse.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
D. -D. Niu, J. Cui, H. Gu, X. -S. Wu, Y. -T. Cao, L. -K. Dai, M. -Y. Wu, T. -L. Zhang, Z. -J. Rong, Y. Wei
Summary: The study utilizes measurements from instruments on board the Mars Atmosphere and Volatile Evolution spacecraft to analyze the heating rates of neutrals, ions, and electrons on the nightside of Mars. It is found that nightside neutral heating is primarily influenced by exothermic chemistry and interaction with thermal ions, while ion heating is mainly driven by energetic ion production.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Munazza K. Alam, Mercedes Lopez-Morales, Ryan J. MacDonald, Nikolay Nikolov, James Kirk, Jayesh M. Goyal, David K. Sing, Hannah R. Wakeford, Alexander D. Rathcke, Drake L. Deming, Jorge Sanz-Forcada, Nikole K. Lewis, Joanna K. Barstow, Thomas Mikal-Evans, Lars A. Buchhave
Summary: Exoplanets with cloud-free, haze-free atmospheres are important for detailed atmospheric characterization and precise chemical abundance constraints. The study presents the first transmission spectrum of WASP-62b, showing Na i and SiH spectral features. Using simulated observations, it is demonstrated that the James Webb Space Telescope can conclusively detect various molecules in the atmosphere of WASP-62b, making it a benchmark giant exoplanet for atmospheric characterization.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Instruments & Instrumentation
Macey W. Sandford, Anupam K. Misra, Tayro E. Acosta-Maeda, Shiv K. Sharma, John N. Porter, Miles J. Egan, M. Nurul Abedin
Summary: Raman spectroscopy is a versatile technique for detecting and characterizing molecular compounds, with applications in planetary science. The development of a compact portable remote Raman system has enabled the detection of various compounds from a significant distance, holding potential for solar system exploration missions.
APPLIED SPECTROSCOPY
(2021)
Article
Geochemistry & Geophysics
Miguel Angel Lopez-Valverde, Bernd Funke, Adrian Brines, Aurelien Stolzenbach, Ashimananda Modak, Brittany Hill, Francisco Gonzalez-Galindo, Ian Thomas, Loic Trompet, Shohei Aoki, Geronimo Villanueva, Giuliano Liuzzi, Justin Erwin, Udo Grabowski, Francois Forget, Jose Juan Lopez-Moreno, Julio Rodriguez-Gomez, Bojan Ristic, Frank Daerden, Giancarlo Bellucci, Manish Patel, Ann-Carine Vandaele
Summary: We present vertical profiles of temperature and density on Mars using solar occultation observations by the NOMAD spectrometer. We obtained temperature and CO2 profiles up to about 90 km, with consistent hydrostatic adjustment, after adapting a retrieval scheme to Mars conditions. Our results reveal the impact of a global dust storm on the atmosphere, which warmed the atmosphere at all altitudes and limited the sounding of tropospheric layers. The retrieved temperatures agree well with global climate models at tropospheric altitudes, but show differences in the mesosphere, particularly during the dust storm.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Environmental Sciences
Bianca Maria Dinelli, Samuele Del Bianco, Elisa Castelli, Alessio Di Roma, Giacomo Lorenzi, Margherita Premuda, Flavio Barbara, Marco Gai, Piera Raspollini, Gianluca Di Natale
Summary: This paper introduces two full physics codes that can accurately compute the spectrum of Earth radiation escaping to space, which is of great significance for Earth exploration missions and the study and design of planetary atmospheres.
Article
Astronomy & Astrophysics
Caroline Piaulet, Bjorn Benneke, Ryan A. Rubenzahl, Andrew W. Howard, Eve J. Lee, Daniel Thorngren, Ruth Angus, Merrin Peterson, Joshua E. Schlieder, Michael Werner, Laura Kreidberg, Tareq Jaouni, Ian J. M. Crossfield, David R. Ciardi, Erik A. Petigura, John Livingston, Courtney D. Dressing, Benjamin J. Fulton, Charles Beichman, Jessie L. Christiansen, Varoujan Gorjian, Kevin K. Hardegree-Ullman, Jessica Krick, Evan Sinukoff
Summary: WASP-107b, with its mass comparable to Neptune but radius similar to Jupiter, challenges planet formation theories. Its low surface gravity and the star's brightness make it an ideal target for atmospheric characterization. The research presents findings from a 4-year RV follow-up program and detailed study on gas envelope accretion, revealing insights into WASP-107b's nature and the system's formation history. Additionally, a second, more massive planet in the system is detected, potentially impacting the orbital migration and spin-orbit misalignment of WASP-107b.
ASTRONOMICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
A. Lira-Barria, P. M. Rojo, R. A. Mendez
Summary: The study aims to develop a model-unbiased technique using transit spectroscopy to analyze atomic spectral lines in exoplanetary transit data and search for relative absorption. The analysis of multiple datasets has revealed possible signs of spectral line absorption.
ASTRONOMY & ASTROPHYSICS
(2022)
Review
Astronomy & Astrophysics
Ralf Halama, Gray Bebout
Summary: Understanding the Earth's geological nitrogen and carbon cycles is crucial for assessing their distribution between different Earth reservoirs. Variations in the fluxes of nitrogen and carbon through geological time have influenced Earth's evolution and atmosphere composition. Subduction zones play a key role in the transfer of nitrogen and carbon, with important implications for the Earth's mantle and atmosphere dynamics.
SPACE SCIENCE REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
Carl Christian Liebe, David Arge Klevang Pedersen, Abigail Allwood, Anastassia Bang, Seth Bartman, Mathias Benn, Troelz Denver, Gary Doran, Marc C. Foote, Andreas Jorgensen, John Leif Jorgensen, Patrick Meras, Timothy P. Setterfield, Robert Sharrow, Michael E. Sondheim, Lars Timmermann, Shihchuan Tsai, Lawrence A. Wade, Daniel W. Wilson
Summary: This article describes an optical sensor system for accurately positioning instruments/payloads relative to an unknown surface. The sensor utilizes various image processing techniques and optical stimulation, and can place instruments on the unknown surface with precision using TRN.
IEEE SENSORS JOURNAL
(2022)
Article
Astronomy & Astrophysics
McCullen Sandora, Vladimir Airapetian, Luke Barnes, Geraint F. Lewis
Summary: Stellar activity and planetary atmospheric properties can influence habitability, but they have not been adequately studied in the context of the multiverse. This study investigates the effects of solar wind, mass loss, and extreme ultra-violet flux on planetary atmospheres and their relationship with fundamental constants. It also explores the necessity of planetary magnetic fields for habitability and the impact of atmospheric effects on multiverse calculations.
Article
Astronomy & Astrophysics
A. Claret, J. Southworth
Summary: Limb darkening is an important phenomenon in stellar research, and the power-2 limb darkening law provides a good match to the specific intensities predicted by stellar atmosphere models. The coefficients for the power-2 law have been computed for various space missions and photometric systems. The results confirm the superiority of the power-2 law in terms of fitting quality, especially compared to the widely-used quadratic law.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Simon Blouin, Siyi Xu
Summary: Recent studies show that the mass accretion rates of cool, old white dwarfs do not significantly decrease over several billion years of cooling time, indicating the need for mechanisms to consistently deliver planetesimals inside the Roche radius of white dwarfs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Optics
Peter F. Bernath, Ryan Johnson, Jacques Lievin
Summary: The study fitted spectroscopic data on SO using PGOPHER, combined with LeRoy's RKR and LEVEL programs to calculate transition dipole matrix elements for all possible bands, resulting in comprehensive line lists for SO.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Instruments & Instrumentation
Anupam K. Misra, Tayro E. Acosta-Maeda, John N. Porter, Genesis Berlanga, Dalton Muchow, Shiv K. Sharma, Brian Chee
APPLIED SPECTROSCOPY
(2019)
Article
Optics
Genesis Berlanga, Tayro E. Acosta-Maeda, Shiv K. Sharma, John N. Porter, Przemyslaw Dera, Hannah Shelton, G. Jeffrey Taylor, Anupam K. Misra
Article
Astronomy & Astrophysics
Jessica M. Stromberg, Alexis Parkinson, Matthew Morison, Edward Cloutis, Nora Casson, Daniel Applin, Jordan Poitras, Arola Moreras Marti, Catherine Maggiori, Claire Cousins, Lyle Whyte, Roman Kruzelecky, Debarati Das, Richard Leveille, Kim Berlo, Shiv K. Sharma, Tayro Acosta-Maeda, Michael Daly, Emmanuel Lalla
PLANETARY AND SPACE SCIENCE
(2019)
Article
Spectroscopy
Miles J. Egan, Tayro E. Acosta-Maeda, S. Michael Angel, Shiv K. Sharma
JOURNAL OF RAMAN SPECTROSCOPY
(2020)
Article
Spectroscopy
S. K. Sharma, J. N. Porter, A. K. Misra, T. E. Acosta-Maeda, S. M. Angel, C. P. Mckay
JOURNAL OF RAMAN SPECTROSCOPY
(2020)
Article
Instruments & Instrumentation
Shiv K. Sharma, Bruce M. Howe, Anupam K. Misra, Mark R. Rognstad, John N. Porter, Tayro E. Acosta-Maeda, Miles J. Egan
Summary: This study introduces the fabrication of an underwater time-gated standoff Raman sensor and demonstrates its capabilities in detecting hazardous chemicals in seawater and tap water samples up to a distance of 6m, as well as in plastic containers submerged in Hawaiian Harbor water. The sensor combines a custom Raman spectrometer, custom scanner, and commercial diode-pumped pulsed 532 nm laser housed in a pressure housing, showing potential for remote chemical detection applications.
APPLIED SPECTROSCOPY
(2021)
Article
Chemistry, Multidisciplinary
Pavel V. Zinin, Tayro E. Acosta-Maeda, Anupam K. Misra, Shiv K. Sharma
Summary: The fluorescence spectra of graphitic and spherical modifications of carbon nitride were measured with green pulsed laser intensity. It was found that the fluorescence peak of spherical nanoparticles shifted towards the anti-Stokes side with increasing laser intensity, with no such observation in the case of graphitic particles. The intensity ratio of the anti-Stokes peak to the Stokes peak increased with higher laser intensity.
Article
Instruments & Instrumentation
Evan M. Kelly, Miles J. Egan, Arelis Colon, S. Michael Angel, Shiv K. Sharma
Summary: This paper presents a remote Raman spectrometer based on single-grating monolithic SHRS, which has a large spectral range, high resolution, low alignment sensitivity, and high light throughput. It is a promising candidate for planetary exploration.
APPLIED SPECTROSCOPY
(2023)
Article
Instruments & Instrumentation
Evan M. Kelly, Miles J. Egan, Arelis Colon, S. Michael Angel, Shiv K. Sharma
Summary: This study investigates the impact of different types of cameras (CCD, ICCD, and CMOS) on the performance of the 1g-mSHRS system. The results show that increasing the number of pixels along the X-axis improves fringe visibility and resolution, while the number of pixels along the Y-axis, chip size, and dimensions affect the signal-to-noise ratio.
APPLIED SPECTROSCOPY
(2023)
Proceedings Paper
Environmental Sciences
Tayro E. Acosta-Maeda, Anupam K. Misra, Lloyd G. Muzangwa, Genesis Berlanga, Shiv K. Sharma, M. Nurul Abedin
LIDAR REMOTE SENSING FOR ENVIRONMENTAL MONITORING XVI
(2018)
Proceedings Paper
Environmental Sciences
Shiv K. Sharma, John N. Porter, Anupam K. Misra, Tayro E. Acosta-Maeda
LIDAR REMOTE SENSING FOR ENVIRONMENTAL MONITORING XVI
(2018)
Proceedings Paper
Environmental Sciences
Anupam K. Misra, Tayro E. Acosta-Maeda, John Porter, Miles J. Egan, Macey Sandford, Patrick J. Gasda, Shiv K. Sharma, Paul Lucey, David Garmire, Jie Zhou, Tamra Oyama, Noah Acosta, Chris P. McKay, Roger C. Wiens, Samuel M. Clegg, Ann M. Ollila, Nurul Abedin
LIDAR REMOTE SENSING FOR ENVIRONMENTAL MONITORING XVI
(2018)
Proceedings Paper
Environmental Sciences
Miles J. Egan, Shiv K. Sharma, Tayro E. Acosta-Maeda
LIDAR REMOTE SENSING FOR ENVIRONMENTAL MONITORING XVI
(2018)
Proceedings Paper
Physics, Applied
A. A. Bykov, I. B. Kutuza, P. V. Zinin, A. S. Machikhin, I. A. Troyan, K. M. Bulatov, V. I. Batshev, Y. V. Mantrova, M. I. Gaponov, V. B. Prakapenka, S. K. Sharma
XXXII INTERNATIONAL CONFERENCE ON INTERACTION OF INTENSE ENERGY FLUXES WITH MATTER (ELBRUS 2017)
(2018)
Meeting Abstract
Chemistry, Multidisciplinary
Shiv Sharma
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2018)