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Retrieved atmospheric properties of the sub-stellar object VHS 1256 b with HST, VLT, and JWST spectra
Zhou, Yifan; Bowler, Brendan P.; Vos, Johanna M. +3 more
Motivated by the observed ~30% variations in flux from the L7 dwarf VHS 1256 b, we subjected its time-resolved Hubble Space Telescope (HST) WFC3 spectra (measured in two epochs: 2018 and 2020), as well as medium-resolution Very Large Telescope (VLT) X-shooter and Early Release Science James Webb Space Telescope (JWST) spectra to a suite of both st…
Kinematics of Fainst Stars of the Sco-Cen Association According to Gaia Catalog
Bobylev, V. V.; Bajkova, A. T.
The kinematic properties of the Sco-Cen association have been studied using the spatial velocities of young stars. New kinematic age estimates for the three components of the association with the age of UCL and LCC being
The effect of baseline on the uncertainties of range determination performed by two-site astrometric observations. A sample case for the triangulation method: TURKSAT 3A and TURKSAT 4A
Gökay, H. G.; Özdemi̇r, S.; Bağıran, M. N. +1 more
The uncertainties in range determination depending on two-site locations for GEO satellites were calculated and shown that the uncertainty in the range depends not only on linear baseline distance between the locations but also both latitude and longitude of geographic coordinates of the sites. By taking the first observing site as fixed and chang…
Influence of Processes on the Sun and in the Interplanetary Medium on the Solar Proton Event on March 30, 2022
Vlasova, N. A.; Bazilevskaya, G. A.; Ginzburg, E. A. +5 more
The article presents the results of a comparative analysis of the solar proton event on March 30, 2022, which has an unusual time profile of solar proton fluxes, and the previous and subsequent solar proton events (March 28, 2022, and April 02, 2022). Increases in energetic proton fluxes in the interplanetary and near-Earth space are associated wi…
Supervised machine learning on Galactic filaments: II. Encoding the position to optimize the detection of filaments over a wide range of column density and contrast
Arzoumanian, D.; Zavagno, A.; Schisano, E. +5 more
Context. Filaments host star formation and are fundamental structures of galaxies. Their diversity, as observed in the interstellar medium, from very low-density structures to very dense hubs, and their complex life cycles make their complete detection challenging over this large diversity range. Aims. Using 2D H2 column density images …
Detecting New Visual Binaries in Gaia DR3 with Gaia and Two Micron All Sky Survey (2MASS) Photometry. II. Speckle Observations of 16 Low-separation Systems
Stassun, Keivan G.; Lépine, Sébastien; Medan, Ilija +1 more
Here we present speckle observations of 16 low-separation (s < 30 au) high-probability candidate binaries from the catalog by Medan et al., where secondaries typically lack astrometric solutions in Gaia. From these speckle observations, we find a second component is always detected within the field of view. To determine if the detection is cons…
A Tale of Three: Magnetic Fields along the Orion Integral-shaped Filament as Revealed by the JCMT BISTRO Survey
Zhang, Yapeng; Pattle, Kate; Karoly, Janik +152 more
As part of the B-fields In Star-forming Region Observations survey, we present James Clerk Maxwell Telescope (JCMT) 850 µm polarimetric observations toward the Orion integral-shaped filament (ISF) that covers three portions known as OMC-1, OMC-2, and OMC-3. The magnetic field threading the ISF seen in the JCMT POL-2 map appears as a tale of …
Central molecular zones in galaxies: 13CO(6–5) and molecular gas conditions in bright nearby galaxies
Güsten, R.; Israel, F. P.; Lundgren, A.
This paper summarizes all presently available Jupp ≥ 5 13CO and accompanying 12CO measurements of galaxy centers including new J = 6–5 13CO and 12CO observations of eleven galaxies with the Atacama Pathfinder EXperiment (APEX) telescope and also Herschel high-J measurements of both species in …
Lack of emission lines in the optical spectra of SAX J1808.4–3658 during reflaring of the 2019 outburst
D'Avanzo, P.; Campana, S.; Russell, D. M. +5 more
Aims. We present spectroscopy of the accreting X-ray binary and millisecond pulsar SAX J1808.4–3658. These observations are the first to be obtained during a reflaring phase. We collected spectroscopic data during the beginning of the reflaring of the 2019 outburst and compared them to previous datasets taken at different epochs, both of the same …
The role of stellar mass in the cosmic history of star formation as seen by Herschel and ALMA
Magnelli, B.; Daddi, E.; Elbaz, D. +4 more
Aims. We explore the contribution of galaxies, as a function of their stellar mass, to the cosmic star formation history (CSFH). In order to avoid uncertain extrapolations of the infrared luminosity function, which is often polluted by the contribution of starbursts, we base our analysis on stellar mass. Attenuation by dust is accounted for thanks…