Search Publications
Electron Temperature Anisotropy and Electron Beam Constraints from Electron Kinetic Instabilities in the Solar Wind
Xie, Huasheng; Wu, Dejin; Sun, Heyu +2 more
Electron temperature anisotropies and electron beams are nonthermal features of the observed nonequilibrium electron velocity distributions in the solar wind. In collision-poor plasmas these nonequilibrium distributions are expected to be regulated by kinetic instabilities through wave-particle interactions. This study considers electron instabili…
ALMA 0.88 mm Survey of Disks around Planetary-mass Companions
Herczeg, Gregory J.; Wilner, David J.; Kraus, Adam L. +6 more
Characterizing the physical properties and compositions of circumplanetary disks can provide important insights into the formation of giant planets and satellites. We report Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum observations of six planetary-mass (10-20 MJup) companions: CT Cha b, 1RXS 1609 b, ROXs 12 b…
Long tidal tails in merging galaxies and their implications
Bell, Eric F.; Valls-Gabaud, David; Duc, Pierre-Alain +8 more
We investigate the properties of long tidal tails using the largest to date sample of 461 merging galaxies with $\log (M_\ast /\rm M_\odot)\ge 9.5$ within 0.2 ≤ z ≤ 1 from the COSMOS survey in combination with Hubble Space Telescope imaging data. Long tidal tails can be briefly divided into three shape types: straight (41 per cent), curved (47 per…
Helium Line Emissivities in the Solar Corona
Andretta, V.; Del Zanna, G.; Storey, P. J. +1 more
We present new collisional-radiative models (CRMs) for helium in the quiescent solar corona and predict the emissivities of the He and He+ lines to be observed by DKIST, Solar Orbiter, and Proba-3. We discuss in detail the rates we selected for these models, highlighting several shortcomings we have found in previous work. As no previou…
On the Diversity of Jet Production Efficiency in Swift/BAT AGNs
Sikora, Marek; Gupta, Maitrayee; Rusinek, Katarzyna +1 more
We address the very large diversity of jet production efficiency in active galactic nuclei (AGNs) by using data on low-redshift AGNs selected from the Swift/BAT catalog and having black hole (BH) masses larger than 108.5 M⊙. Most of these AGNs accrete at intermediate rates and have bolometric luminosities dominated by mid-IR …
The Extreme Red Excess in Blazar Ultraviolet Broad Emission Lines
Berton, Marco; Punsly, Brian; Marziani, Paola +1 more
We present a study of quasars with very redward asymmetric (RA) ultraviolet (UV) broad emission lines (BELs). An excess of redshifted emission has been previously shown to occur in the BELs of radio-loud quasars and is most extreme in certain blazars. Paradoxically, blazars are objects that are characterized by a highly relativistic blueshifted ou…
Broadband transmission spectroscopy of HD 209458b with ESPRESSO: evidence for Na, TiO, or both
Bouchy, F.; Rebolo, R.; Pallé, E. +42 more
Context. The detection and characterization of exoplanet atmospheres is currently one of the main drivers pushing the development of new observing facilities. In this context, high-resolution spectrographs are proving their potential and showing that high-resolution spectroscopy will be paramount in this field.
Aims: We aim to make use of ESP…
The luminosity evolution of nova shells. I. A new analysis of old data
Vogt, N.; Ederoclite, A.; Schmidtobreick, L. +3 more
Over the last decade, nova shells have been discovered around a small number of cataclysmic variables that had not been known to be post-novae, while other searches around much larger samples have been mostly unsuccessful. This raises the question about how long such shells are detectable after the eruption and whether this time limit depends on t…
ALMA Observations of Young Eruptive Stars: Continuum Disk Sizes and Molecular Outflows
Hales, Antonio S.; Pérez, Sebastián; Gonzalez-Ruilova, Camilo +7 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations of four young, eruptive star-disk systems at 0"4 resolution: two FUors (V582 Aur and V900 Mon), one EXor (UZ Tau E), and one source with an ambiguous FU/EXor classification (GM Cha). The disks around GM Cha, V900 Mon, and UZ Tau E are resolved. These observations in…
TOI 694b and TIC 220568520b: Two Low-mass Companions near the Hydrogen-burning Mass Limit Orbiting Sun-like Stars
Henning, Thomas; Butler, R. Paul; Latham, David W. +40 more
We report the discovery of TOI 694 b and TIC 220568520 b, two low-mass stellar companions in eccentric orbits around metal-rich Sun-like stars, first detected by the Transiting Exoplanet Survey Satellite (TESS). TOI 694 b has an orbital period of 48.05131 ± 0.00019 days and eccentricity of 0.51946 ± 0.00081, and we derive a mass of 89.0 ± 5.3 ${M}…