Search Publications
Wave Activity in Jupiter's North Equatorial Belt From Near-Infrared Reflectivity Observations
Wong, Michael H.; Irwin, Patrick G. J.; Orton, Glenn S. +4 more
High spatial resolution images of Jupiter at 1.58-2.28 µm are used to track and characterize a wave pattern observed in 2017 at a planetocentric latitude of 14°N. The wave pattern has a wave number of 18 and spans ∼5° in latitude. One bright crest remains stationary in System III longitude, while the remaining crests move slowly westward. Th…
QSO2 outflow characterization using data obtained with OSIRIS at the Gran Telescopio Canarias
Cabrera-Lavers, Antonio; Bellocchi, Enrica; Emonts, Bjorn +1 more
Context. Ionized outflows are ubiquitous in non-radio-loud obscured quasars (QSO2s) at different redshifts. However, the actual size of the outflows and their efficiency for gas ejection and star formation truncation are controversial. Large-scale (exceeding several kiloparsec) extended radio structures might be necessary to identify (even to trig…
Shape evolution of cometary nuclei via anisotropic mass loss
Vavilov, D. E.; Eggl, S.; Medvedev, Yu. D. +1 more
Context. Breathtaking imagery recorded during the European Space Agency Rosetta mission confirmed the bilobate nature of the nucleus of comet 67P/Churyumov-Gerasimenko. The peculiar appearance of the nucleus is not unique among comets. The majority of cometary cores imaged at high resolution exhibit a similar build. Various theories have been brou…
Triangulum-Andromeda Overdensity: a Region with a Complex Stellar Population
Souto, Diogo; Cunha, K.; Majewski, S. R. +4 more
The Triangulum-Andromeda (TriAnd) overdensity is a distant structure of the Milky Way located in the second Galactic quadrant well below the Galactic plane. Since its discovery, its nature has been under discussion, whether it could be old perturbations of the Galactic disk or the remains of a disrupted former dwarf galaxy. In this study, we inves…
Prospects for detecting the astrometric signature of Barnard's Star b
Zucker, S.; Reiners, A.; Ribas, I. +2 more
A low-amplitude periodic signal in the radial velocity (RV) time series of Barnard's Star was recently attributed to a planetary companion with a minimum mass of 3.2 M⊕ at an orbital period of 233 days. The relatively long orbital period and the proximity of Barnard's Star to the Sun raises the question whether the true mass of the plan…
The 2018 eruption and long-term evolution of the new high-mass Herbig Ae/Be object Gaia-18azl = VES 263
Munari, U.; Banerjee, D. P. K.; Čotar, K. +10 more
We have been monitoring, at high cadence, the photometric and spectroscopic evolution of VES 263 following the discovery in 2018 of a brightening labelled as event Gaia-18azl. VES 263 is so far a neglected emission-line object discovered in the 1960s on objective prism plates, tentatively classified as a semiregular AGB cool giant by automated ana…
X-ray emission in the enigmatic CVSO 30 system
Schmitt, J. H. M. M.; Schmidt, T. O. B.; Czesla, S. +3 more
CVSO 30 is a young, active, weak-line T Tauri star; it possibly hosts the only known planetary system with both a transiting hot-Jupiter and a cold-Jupiter candidate (CVSO 30 b and CVSO 30 c). We analyzed archival ROSAT, Chandra, and XMM-Newton data to study the coronal emission in the system. According to our modeling, CVSO 30 shows a quiescent X…
Magnetic Stability of Massive Star-forming Clumps in RCW 106
Kusune, Takayoshi; Nakamura, Fumitaka; Tamura, Motohide +6 more
The RCW 106 molecular cloud complex is an active massive star-forming region where a ministarburst is taking place. We examined its magnetic structure by near-IR polarimetric observations with the imaging polarimeter SIRPOL on the IRSF 1.4 m telescope. The global magnetic field is nearly parallel to the direction of the Galactic plane and the clou…
Molecular oxygen generation from the reaction of water cations with oxygen atoms
Fortenberry, Ryan C.; Trabelsi, Tarek; Westbrook, Brent R. +2 more
The oxywater cation (H2OO+), previously shown to form barrierlessly in the gas phase from water cations and atomic oxygen, is proposed here potentially to possess a 2A″ ←4A″ excitation leading to the H2⋯O2+ complex. This complex could then easily decompose into molecular …
Optical Observations of the Nearby Galaxy NGC 2366 Through Narrowband H_alpha and [SII] Filters. Supernova Remnants Status
Vučetić, M. M.; Onić, D.; Petrov, N. +2 more
We present detection of 64 HII regions, three superbubbles and two optical supernova remnant (SNR) candidates in the nearby irregular galaxy NGC 2366. The SNR candidates were detected by applying [SII]Hα ratio criterion to observations made with the 2-m RCC telescope at Rozhen National Astronomical Observatory in Bulgaria. In this paper we report …