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Are Disks of Satellites Comprised of Tidal Dwarf Galaxies?
Famaey, Benoit; Kroupa, Pavel; Thies, Ingo +1 more
It was found that satellites of nearby galaxies can form flattened co-rotating structures called disks of satellites or planes of satellites. Their existence is not expected by the current galaxy formation simulations in the standard dark matter-based cosmology. On the contrary, modified gravity offers a promising alternative: the objects in the d…
The GALAH Survey: No Chemical Evidence of an Extragalactic Origin for the Nyx Stream
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +20 more
The results from the ESA Gaia astrometric mission and deep photometric surveys have revolutionized our knowledge of the Milky Way. There are many ongoing efforts to search these data for stellar substructure to find evidence of individual accretion events that built up the Milky Way and its halo. One of these newly identified features, called Nyx,…
Discovery, TESS Characterization, and Modeling of Pulsations in the Extremely Low-mass White Dwarf GD 278
Córsico, Alejandro H.; Hermes, J. J.; Bell, Keaton J. +5 more
We report the discovery of pulsations in the extremely low-mass (ELM), likely helium-core white dwarf GD 278 via ground- and space-based photometry. GD 278 was observed by the Transiting Exoplanet Survey Satellite (TESS) in Sector 18 at a 2 minute cadence for roughly 24 days. The TESS data reveal at least 19 significant periodicities between 2447 …
Precipitation Driven Pedogenic Weathering of Volcaniclastics on Early Mars
Michalski, J. R.; Ye, B.
Compositional stratigraphy, generally composed of Al rich clay minerals overlying Fe/Mg rich clay minerals, is observed in many locations on Mars. Here we describe the occurrence of such mineralogical stratigraphy in settings where the protoliths are almost certainly pyroclastic materials. One such example includes altered rocks high on the summit…
Evolution of the atomic component in protostellar outflows
Eislöffel, J.; Krabbe, A.; Nisini, B. +3 more
Context. We present SOFIA/FIFI-LS observations of three Class 0 and one Class I outflows (Cep E, HH 1, HH 212, and L1551 IRS5) in the far-infrared [O I]63 µm and [O I]145 µm transitions. Spectroscopic [O I]63 µm maps enabled us to infer the spatial extent of warm (T ∼ 500−1200 K), low-excitation a…
Toward a 3D kinetic tomography of Taurus clouds. I. Linking neutral potassium and dust
Hottier, C.; Lallement, R.; Vergely, J. L. +1 more
Context. Gaia parallaxes and photometric measurements open a three-dimensional (3D) era for the Milky Way, including its interstellar (IS) matter. Three-dimensional Galactic dust distributions are constructed in various ways, based on Gaia data and photometric or spectroscopic surveys.
Aims: The assignment of radial motions to IS dust structu…
Simultaneous photometric and CARMENES spectroscopic monitoring of fast-rotating M dwarf GJ 3270. Discovery of a post-flare corotating feature
Amado, P. J.; Caballero, J. A.; Czesla, S. +33 more
Context. Active M dwarfs frequently exhibit large flares, which can pose an existential threat to the habitability of any planet in orbit in addition to making said planets more difficult to detect. M dwarfs do not lose angular momentum as easily as earlier-type stars, which maintain the high levels of stellar activity for far longer. Studying you…
The Common Origin of High-energy Protons in Solar Energetic Particle Events and Sustained Gamma-Ray Emission from the Sun
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +2 more
We report that the number of >500 MeV protons (Ng) inferred from sustained gamma-ray emission (SGRE) from the Sun is significantly correlated with that of protons propagating into space (NSEP) as solar energetic particles (SEPs). Under the shock paradigm for SGRE, shocks driven by coronal mass ejections (CMEs) accelerate h…
HAWC Search for High-mass Microquasars
Lee, W. H.; Alvarez, C.; Hernandez, S. +86 more
Microquasars with high-mass companion stars are promising very high energy (VHE; 0.1-100 TeV) gamma-ray emitters, but their behaviors above 10 TeV are poorly known. Using the High Altitude Water Cerenkov (HAWC) observatory, we search for excess gamma-ray emission coincident with the positions of known high-mass microquasars (HMMQs). No significant…
KMT-2019-BLG-0797: Binary-lensing event occurring on a binary stellar system
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +18 more
Aims: We analyze the microlensing event KMT-2019-BLG-0797. The light curve of the event exhibits two anomalous features from a single-lens single-source model, and we aim to reveal the nature of the anomaly.
Methods: It is found that a model with two lenses plus a single source (2L1S model) can explain one feature of the anomaly, but the…