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Chemical weathering over hundreds of millions of years of greenhouse conditions on Mars
Michalski, Joseph R.; Ye, Binlong
Chemical weathering profiles on Mars which consist of an upper Al clay-rich, Fe-poor layer and lower Fe/Mg clay-rich layer are believed to have formed due to precipitation-driven top down leaching process in an ancient, reducing greenhouse climate. Here we use remote sensing imagery and spectroscopy coupled with topographic data and crater chronol…
FARWEST: Efficient Computation of Wave-Particle Interactions for a Dynamic Description of the Electron Radiation Belt Diffusion
Darrouzet, Fabien; Santolik, Ondrej; Pierrard, Viviane +5 more
In this paper, we present a new method to compute rapidly, wave particle interaction induced pitch angle and momentum diffusion coefficients. Those terms are normally obtained by the numerical solving of equations based on the quasi-linear theory. However, this bulk resolution leads to a high computational cost, preventing the integration of plasm…
Spectral and temporal properties of ultra-luminous X-ray source NGC 55 ULX1
Jithesh, V.
We investigate the spectral and temporal properties of ultra-luminous X-ray source (ULX) NGC 55 ULX1 using Swift, XMM-Newton and NuSTAR observations conducted during 2013-2021. In these observations, the source flux varies by a factor of ~5-6, and we identify the source mainly in the soft ultraluminous (SUL) state of ULXs. We fit the X-ray spectra…
A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs. Color validation of TOI-4479b and TOI-2081b
Tamura, M.; Pallé, E.; Korth, J. +45 more
Aims: We report the discovery and validation of two TESS exoplanets orbiting faint M dwarfs: TOI-4479b and TOI-2081b.
Methods: We jointly analyzed space (TESS mission) and ground-based (MuSCAT2, MuSCAT3 and SINISTRO instruments) light curves using our multicolor photometry transit analysis pipeline. This allowed us to compute contaminati…
Galaxy clustering in the VVV near-IR galaxy catalogue
Minniti, Dante; Alonso, M. Victoria; Valotto, Carlos +7 more
Mapping galaxies at low Galactic latitudes and determining their clustering status are fundamental steps in defining the large-scale structure in the nearby Universe. The VISTA Variables in the Vía Láctea (VVV) near-IR galaxy catalogue (VVV NIRGC) allows us to explore this region in great detail. Our goal is to identify galaxy overdensities and ch…
Ionospheric total electron content anomaly possibly associated with the April 4, 2010 Mw7.2 Baja California earthquake
Zhou, Chen; Liu, Jing; Wang, Wenbin +2 more
Identifying ionospheric disturbances potentially related to an earthquake is a challenging work. Based on the ionospheric total electron content (TEC) data from the madrigal database at the Haystack Observatory, Massachusetts Institute of Technology, a new decomposition and nonlinear fitting method has been developed and applied in this work to ex…
Identifying RR Lyrae in the ZTF DR3 data set
Koposov, Sergey E.; Huang, Kuan-Wei
We present an RR Lyrae (RRL) catalogue based on the combination of the third data release of the Zwicky Transient Facility (ZTF DR3) and Gaia EDR3. We use a multistep classification pipeline relying on the Fourier decomposition fitting to the multiband ZTF light curves and random forest classification. The resulting catalogue contains 71 755 RRLs …
Solar Polar Flux Redistribution Based on Observed Coronal Holes
Jones, Shaela I.; Arge, Charles N.; Henney, Carl J. +1 more
We explore the use of observed polar coronal holes (CHs) to constrain the flux distribution within the polar regions of global solar magnetic field maps in the absence of reliable quality polar field observations. Global magnetic maps, generated by the Air Force Data Assimilative Photospheric flux Transport (ADAPT) model, are modified to enforce f…
Estimating the Spin of the Black Hole Candidate MAXI J1659-152 with the X-Ray Continuum-fitting Method
Steiner, James F.; Gou, Lijun; Wu, Jianfeng +6 more
As a transient X-ray binary, MAXI J1659-152 contains a black hole candidate as its compact star. MAXI J1659-152 was discovered on 2010 September 25 during its only known outburst. Previously published studies of this outburst indicate that MAXI J1659-152 may have an extreme retrograde spin, which, if confirmed, would provide an important clue as t…
Searching for Cataclysmic Variable Stars in Unidentified X-Ray Sources
Takata, J.; Kong, A. K. H.; Hui, C. Y. +6 more
We carry out a photometric search for new cataclysmic variable stars (CVs), with the goal of identification for candidates of AR Scorpii-type binary systems. We select GAIA sources that are likely associated with unidentified X-ray sources, and analyze the light curves taken by the Zwicky Transient Facility, Transiting Exoplanet Survey Satellite, …