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BASS. XXIII. A New Mid-infrared Diagnostic for Absorption in Active Galactic Nuclei
Ricci, Claudio; Stern, Daniel; Trakhtenbrot, Benny +15 more
In this study, we use the Swift/BAT AGN sample, which has received extensive multiwavelength follow-up analysis as a result of the BAT AGN Spectroscopic Survey, to develop a diagnostic for nuclear obscuration by examining the relationship between the line-of-sight column densities (N H), the 2–10 keV to 12 µm luminosity ratio, and…
A search for stellar structures around nine outer halo globular clusters in the Milky Way
Mackey, Dougal; Da Costa, Gary S.; Zhang, Shumeng
We use deep imaging from the Dark Energy Camera to explore the peripheral regions of nine globular clusters in the outer halo of the Milky Way. Apart from Whiting 1 and NGC 7492, which are projected against the Sagittarius stream, we see no evidence for adjacent stellar populations to indicate any of these clusters is associated with coherent tida…
Global Three-Dimensional Draping of Magnetic Field Lines in Earth's Magnetosheath From In-Situ Spacecraft Measurements
Lavraud, B.; Génot, V.; Jeandet, A. +4 more
Magnetic field draping occurs when the magnetic field lines frozen in a plasma flow wrap around a body or plasma environment. The draping of the interplanetary magnetic field (IMF) around the Earth's magnetosphere has been confirmed in the early days of space exploration. However, its global and three-dimensional structure is known from modeling o…
Precise dynamical masses of new directly imaged companions from combining relative astrometry, radial velocities, and HIPPARCOS-Gaia eDR3 accelerations
Zhang, H.; Ségransan, D.; Udry, S. +7 more
Aims: With an observing time span of more than 20 yr, the CORALIE radial-velocity survey is able to detect long-term trends in data corresponding to companions with masses and separations accessible to direct imaging. Combining exoplanet detection techniques, such as radial velocities from the CORALIE survey, astrometric accelerations from HI…
The TESS Grand Unified Hot Jupiter Survey. I. Ten TESS Planets
Henning, Thomas; Butler, R. Paul; Bieryla, Allyson +69 more
Hot Jupiters-short-period giant planets-were the first extrasolar planets to be discovered, but many questions about their origin remain. NASA's Transiting Exoplanet Survey Satellite (TESS), an all-sky search for transiting planets, presents an opportunity to address these questions by constructing a uniform sample of hot Jupiters for demographic …
Scaling relations for globular cluster systems in early-type galaxies - II. Is there an environmental dependence?
Bassino, Lilia P.; Caso, Juan P.; Ennis, Ana I. +1 more
The current properties of globular cluster systems (GCSs) are the result of the evolution experienced by their host galaxies, which shape the richness of the GCS as well as its spatial distribution, among other features. We carry out an analysis of the projected radial distribution of globular clusters for a sample of almost 30 early-type galaxies…
Transit least-squares survey. IV. Earth-like transiting planets expected from the PLATO mission
Heller, René; Samadi, Réza; Harre, Jan-Vincent
In its long-duration observation phase, the PLATO satellite (scheduled for launch in 2026) will observe two independent, non-overlapping fields, nominally one in the northern hemisphere and one in the southern hemisphere, for a total of four years. The exact duration of each pointing will be determined two years before launch. Previous estimates o…
The molecular gas properties in local Seyfert 2 galaxies
Andreani, P.; Pozzi, F.; Hatziminaoglou, E. +8 more
Aims: We present a multiwavelength study of the molecular gas properties of a sample of local Seyfert 2 galaxies to assess if, and to what extent, the presence of an active galactic nucleus (AGN) can affect the interstellar medium (ISM) properties in a sample of 33 local Seyfert 2 galaxies.
Methods: We compare the molecular gas content (…
Disk Evolution Study through Imaging of Nearby Young Stars (DESTINYS): A Panchromatic View of DO Tau's Complex Kilo-astronomical-unit Environment
Ménard, François; Bae, Jaehan; Bergin, Edwin A. +20 more
While protoplanetary disks are often treated as isolated systems in planet formation models, observations increasingly suggest that vigorous interactions between Class II disks and their environments are not rare. DO Tau is a T Tauri star that has previously been hypothesized to have undergone a close encounter with the HV Tau system. As part of t…
White dwarfs identified in LAMOST Data Release 5
Liu, Jifeng; Bai, Yu; Zhang, Huawei +5 more
In this paper, we report white dwarfs (WD) identified in the 5th Data Release of the Large Area Multi-Object fibre Spectroscopic Telescope (LAMOST), including spectral types of DA, DB, DC, DZ, and so on. There are 2625 DA spectra of 2281 DA stars, 182 DB spectra of 166 DB stars, 62 DC spectra of 58 DC stars, 36 DZ spectra of 33 DZ stars…