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Modeling the nonaxisymmetric structure in the HD 163296 disk with planet-disk interaction
Dullemond, C. P.; Kley, W.; Weber, P. +2 more
Context. High-resolution ALMA observations such as the DSHARP campaign have revealed a variety of rich substructures in numerous protoplanetary disks. These structures consist of rings, gaps, and asymmetric features. It has been debated whether planets can be accounted for among these substructures in the dust continuum. Characterizing the origin …
Observations of the Quiet Sun during the Deepest Solar Minimum of the Past Century with Chandrayaan-2 XSM: Elemental Abundances in the Quiescent Corona
Joshi, Bhuwan; Janardhan, P.; Bhardwaj, Anil +12 more
Elements with low first ionization potential (FIP) are known to be 3-4 times more abundant in active region loops of the solar corona than in the photosphere. There have been observations suggesting that this observed "FIP bias" may be different in other parts of the solar corona and such observations are thus important in understanding the underl…
Optical and ultraviolet pulsed emission from an accreting millisecond pulsar
D'Avanzo, P.; Campana, S.; Stella, L. +28 more
Millisecond spinning, low-magnetic-field neutron stars are believed to attain their fast rotation in a 0.1-1-Gyr-long phase during which they accrete matter endowed with angular momentum from a low-mass companion star1. Despite extensive searches, coherent periodicities originating from accreting neutron star magnetospheres have been de…
X-Ray and Radio Bursts from the Magnetar 1E 1547.0-5408
Tiengo, A.; Stella, L.; Rea, N. +10 more
We report on simultaneous radio and X-ray observations of the radio-emitting magnetar 1E 1547.0-5408 on 2009 January 25 and February 3, with the 64 m Parkes radio telescope and the Chandra and XMM-Newton X-ray observatories. The magnetar was observed in a period of intense X-ray bursting activity and enhanced X-ray emission. We report here on the …
Cosmology with the submillimetre galaxies magnification bias. Tomographic analysis
Bonavera, L.; González-Nuevo, J.; Migliaccio, M. +5 more
Context. High-z submillimetre galaxies can be used as a background sample for gravitational lensing studies thanks to their magnification bias. In particular, the magnification bias can be exploited in order to constrain the free parameters of a halo occupation distribution (HOD) model and some of the main cosmological parameters. A pseudo-tomogra…
V899 Mon: A Peculiar Eruptive Young Star Close to the End of Its Outburst
Pál, András; Ogłoza, Waldemar; Lee, Jeong-Eun +15 more
The eruptive young star V899 Mon shows characteristics of both FUors and EXors. It reached a peak brightness in 2010, then briefly faded in 2011, followed by a second outburst. We conducted multifilter optical photometric monitoring, as well as optical and near-infrared spectroscopic observations, of V899 Mon. The light curves and color-magnitude …
Spatial Variation in Strong Line Ratios and Physical Conditions in Two Strongly Lensed Galaxies at z 1.4
Momcheva, Ivelina; Brammer, Gabriel; Acharyya, Ayan +14 more
Upcoming space-based integral field spectrographs will enable spatially resolved spectroscopy of distant galaxies, including at the scale of individual star-forming regions (i.e., down to just tens of parsecs) in galaxies that have been strongly gravitationally lensed. In the meantime, there is only a very small set of lensed galaxies where such s…
EC 22536−5304: a lead-rich and metal-poor long-period binary
Heber, U.; Irrgang, A.; Dorsch, M. +2 more
Helium-burning hot subdwarf stars of spectral types O and B (sdO/B) are thought to be produced through various types of binary interactions. The helium-rich hot subdwarf star EC 22536−5304 was recently found to be extremely enriched in lead. Here, we show that EC 22536−5304 is a binary star with a metal-poor subdwarf F-type (sdF) companion. We per…
Morphological comparison of blocks in chaos terrains on Pluto, Europa, and Mars
Skjetne, Helle L.; Singer, Kelsi N.; Hynek, Brian M. +12 more
Chaotic terrains are characterized by disruption of preexisting surfaces into irregularly arranged mountain blocks with a "chaotic" appearance. Several models for chaos formation have been proposed, but the formation and evolution of this enigmatic terrain type has not yet been fully constrained. We provide extensive mapping of the individual bloc…
The Coma Dust of Comet C/2013 US10 (Catalina): A Window into Carbon in the Solar System
Woodward, Charles E.; Russell, Ray W.; Kelley, Michael S. P. +3 more
Comet C/2013 US10 (Catalina) was a dynamically new Oort cloud comet whose apparition presented a favorable geometry for observations near close-Earth approach (≃0.93 au) at heliocentric distances ≲2 au when insolation and sublimation of volatiles drive maximum activity. Here we present mid-infrared 6.0 ≲ λ(µm) ≲ 40 spectrophotomet…