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Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds. II. Spectroscopic and Environmental Analysis of Thorne-Żytkow Object and Super-AGB Star Candidates
Drout, Maria R.; O'Grady, Anna J. G.; Kochanek, C. S. +9 more
In previous work, we identified a population of 38 cool and luminous variable stars in the Magellanic Clouds and examined 11 in detail in order to classify them as either Thorne-Żytkow objects (TŻOs; red supergiants with a neutron star cores) or super-asymptotic giant branch (sAGB) stars (the most massive stars that will not undergo core collapse)…
The First Y Dwarf Data from JWST Show that Dynamic and Diabatic Processes Regulate Cold Brown Dwarf Atmospheres
Leggett, S. K.; Tremblin, Pascal
The James Webb Space Telescope (JWST) is now observing Y dwarfs, the coldest known brown dwarfs, with effective temperatures T eff ≲ 475 K. The first published observations provide important information: not only is the atmospheric chemistry out of equilibrium, as previously known, but the pressure-temperature profile is not in the stan…
Constraints on (2060) Chiron's size, shape, and surrounding material from the November 2018 and September 2019 stellar occultations
Colas, F.; Sicardy, B.; Gomes-Júnior, A. R. +24 more
Context. After the discovery of rings around the largest known Centaur object, (10199) Chariklo, we carried out observation campaigns of stellar occultations produced by the second-largest known Centaur object, (2060) Chiron, to better characterize its physical properties and presence of material on its surroundings.
Aims: We aim to provide c…
Accretion process, magnetic fields, and apsidal motion in the pre-main sequence binary DQ Tau
Kochukhov, Oleg; Ábrahám, Péter; Kóspál, Ágnes +3 more
Classical T Tauri stars (CTTSs) are young stellar objects that accrete materials from their accretion disc influenced by their strong magnetic field. The magnetic pressure truncates the disc at a few stellar radii and forces the material to leave the disc plane and fall onto the stellar surface by following the magnetic field lines. However, this …
The First Weak-lensing Analysis with the James Webb Space Telescope: SMACS J0723.3-7327
Faisst, Andreas; Chary, Ranga-Ram; Jee, M. James +1 more
Utilizing the James Webb Space Telescope Early Release NIRCam Observations, we perform a weak-lensing analysis of the massive galaxy cluster SMACS J0723.3-7327 (z = 0.39). We investigate the spatial variation of the point-spread function (PSF) from the stars in the mosaic image. Our measurements show that the PSF for both modules has very small sp…
Measuring the ICM velocity structure in the Ophiuchus cluster
Fabian, A. C.; Pinto, C.; Eckert, D. +8 more
We have found evidence of bulk velocities following active galactic nucleus (AGN) bubbles in the Virgo cluster and galaxy motions in the Centaurus cluster. In order to increase the sample and improve our understanding of the intracluster medium (ICM), we present the results of a detailed mapping of the Ophiuchus cluster with XMM-Newton to measure …
Distances to Nearby Molecular Clouds Traced by Young Stars
Zhang, Miaomiao
I present a catalog of distances to 63 molecular clouds located within ~2.5 kpc of the Sun. The cloud distances are derived based on utilizing the Gaia DR3 parallaxes of the young stellar objects (YSOs). By identifying AllWISE YSO candidates (YSOCs) with infrared excesses and combining them with published YSOC catalogs, I compile an all-sky YSOC s…
TOI-179: A young system with a transiting compact Neptune-mass planet and a low-mass companion in outer orbit
Marzari, F.; Girard, J.; Sozzetti, A. +29 more
Context. Transiting planets around young stars are key benchmarks for our understanding of planetary systems. One such candidate, TOI-179, was identified around the K dwarf HD 18599 by TESS.
Aims: We present the confirmation of the transiting planet and the characterization of the host star and of the TOI-179 system over a broad range of angu…
Cometary surface dust layers built out of millimetre-scale aggregates: dependence of modelled cometary gas production on the layer transport properties
Mottola, S.; Küppers, M.; Hartogh, P. +5 more
The standard approach to obtaining knowledge about the properties of the surface layer of a comet from observations of gas production consists of two stages. First, various thermophysical models are used to calculate gas production for a few sets of parameters. Second, a comparison of observations and theoretical predictions is performed. This app…
Enhanced Size Uniformity for Near-resonant Planets
Dai, Fei; Wang, Songhu; Goyal, Armaan V.
Super-Earths within the same close-in, compact planetary system tend to exhibit a striking degree of uniformity in their radius, mass, and orbital spacing, and this "peas-in-a-pod" phenomenon itself serves to provide one of the strongest constrains on planet formation at large. While it has been recently demonstrated from independent samples that …