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Thermal Sounding of the Martian Atmosphere Using the ACS TIRVIM FT-IR Spectrometer on Board ExoMars TGO: Method for Solving the Inverse Problem
Fedorova, A. A.; Grassi, D.; Shakun, A. V. +8 more
This paper presents a method for solving the inverse problem of thermal sounding using calibrated data from the ACS TIRVIM experiment on board the ExoMarsTrace Gas Orbiter. The 1.7-17 µm range TIRVIM Fourier spectrometer as part of the ACS instrument complex aboard the ExoMarsTGO operates in the nadir and solar occultation modes in orbit around Ma…
Visit Nearby Halo Substructures Using LAMOST DR9 MRS Data
Zhao, Gang; Zhao, Jing-Kun; Gao, Qi +3 more
Based on the LAMOST DR9 Medium Resolution Spectra (MRS) catalog, combined with astrometries from Gaia DR3, we conducted an investigation into the substructures in the stellar halo to obtain their chemical and kinematic information. We employed the HDBSCAN algorithm in the (L z , E, L xy ) space for clustering and utilized M…
Verification of Astrometrically Accelerating Stars from Hipparcos and Gaia. I. Methodology and Application to HIP 44842
Tokovinin, Andrei; Makarov, Valeri V.
A large number of candidate binary stars with apparent acceleration on the sky has emerged from analysis of astrometric data collected by the Hipparcos, Tycho-2, and Gaia space missions. Although the apparent acceleration can serve as a relatively reliable indicator of binarity, it provides scarce information about the orbital and physical paramet…
Reconciling concentration to virial mass relations
Saha, Prasenjit; Ferreras, Ignacio; Leier, Dominik +1 more
Context. The concentration-virial mass (c-M) relation is a fundamental scaling relation within the standard cold dark matter (ΛCDM) framework well established in numerical simulations. However, observational constraints of this relation are hampered by the difficulty of characterising the properties of dark matter haloes. Recent comparisons betwee…
SAUNAS. II. Discovery of Cross-shaped X-Ray Emission and a Rotating Circumnuclear Disk in the Supermassive S0 Galaxy NGC 5084
Koekemoer, Anton M.; Laine, Seppo; Lopez-Rodriguez, Enrique +11 more
Combining Chandra, Atacama Large Millimeter/submillimeter Array, EVLA, and Hubble Space Telescope archival data and newly acquired data from the Apache Point Observatory/Dual Imaging Spectrograph, we detect a double-lobed 17 kpc X-ray emission with plumes oriented approximately perpendicular and parallel to the galactic plane of the massive lentic…
Comprehensive Analysis of a Chloride-Rich Topographic Depression in Terra Sirenum, Mars: A Possible Lost Basin With Astrobiological Significance
Singh, Deepali; Sinha, Rishitosh K.; Acharyya, Kinsuk
The hygroscopic nature of chlorides gives them the potential to provide a harbor for microbes to adapt and survive in extreme conditions, which is pertinent to Mars, given its evolution of climatic conditions. Moreover, observations of secondary hydrous minerals in chloride-rich regions have opened the case for a diverse geological environment on …
Exploring the directly imaged HD 1160 system through spectroscopic characterization and high-cadence variability monitoring
Ertel, Steve; Woodward, Charles E.; Kenworthy, Matthew A. +15 more
The time variability and spectra of directly imaged companions provide insight into their physical properties and atmospheric dynamics. We present follow-up R ~ 40 spectrophotometric monitoring of red companion HD 1160 B at 2.8-4.2 µm using the double-grating 360° vector Apodizing Phase Plate (dgvAPP360) coronagraph and ALES integral field s…
Spectroscopic Follow-up on Potential Magnetic Cataclysmic Variables
Littlefield, Colin; Szkody, Paula; Rich, R. Michael +8 more
Spectroscopic observations of nine cataclysmic variables that have been postulated to contain magnetic white dwarfs were obtained to further characterize their classifications, orbital parameters, inclinations, and/or accretion properties. Zwicky Transient Facility (ZTF) and Transiting Exoplanet Survey Satellite (TESS) data were also used when ava…
Cold Water Emission Cannot Be Used to Infer Depletion of Bulk Elemental Oxygen [O/H] in Disks
Gorti, Uma; Ruaud, Maxime
We reexamine the constraints provided by Herschel Space Observatory data regarding cold water emission from protoplanetary disks. Previous disk models that were used to interpret observed water emission concluded that oxygen (O/H) is depleted by at least 2 orders of magnitude if a standard, interstellar gas/dust mass ratio is assumed in the disk. …
Investigating the Mass of the Black Hole and Possible Wind Outflow of the Accretion Disk in the Tidal Disruption Event AT2021ehb
Drake, Jeremy J.; Zoghbi, Abderahmen; Miller, Jon M. +11 more
Tidal disruption events (TDEs) can potentially probe low-mass black holes (BHs) in host galaxies that might not adhere to bulge or stellar-dispersion relationships. At least initially, TDEs can also reveal super-Eddington accretion. X-ray spectroscopy can potentially constrain BH masses, and reveal ionized outflows associated with super-Eddington …