Search Publications
A global view on the colliding-wind binary WR 147
Zhekov, Svetozar A.; Tomov, Toma V.; Petrov, Blagovest V. +1 more
We present results from a global view on the colliding-wind binary WR 147. We analysed new optical spectra of WR 147 obtained with the Gran Telescopio Canarias and archive spectra from the Hubble Space Telescope by making use of modern atmosphere models accounting for optically thin clumping. We adopted a grid-modelling approach to derive some bas…
Evaluating Stereo DTM Quality at Jezero Crater, Mars with HRSC, Ctx, and Hirise Images
Kirk, R. L.; Gwinner, K.; Fergason, R. L. +5 more
We have used a high-precision, high-resolution digital terrain model (DTM) of the NASA Mars 2020 rover Perseverance landing site in Jezero crater based on mosaicked images from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment (MRO HiRISE) camera as a reference dataset to evaluate DTMs based on Mars Express High Resolution…
Poorly Studied Eclipsing Binaries in the Field of DO Draconis: V454 Dra and V455 Dra
Kim, Yonggi; Yoon, Joh-Na; Andronov, Ivan L. +3 more
We report an analysis of two poorly studied eclipsing binary stars, GSC 04396-00605 and GSC 04395-00485 (recently named V455 Dra and V454 Dra, respectively). Photometric data of the two stars were obtained using the 1-m Korean telescope of the LOAO operated by KASI while monitoring the cataclysmic variable DO Dra in the frame of the Inter-Longitud…
Suprathermal Fe in the Earth's Plasma Environment: Cluster RAPID Observations
Dandouras, I.; Daly, P. W.; Haaland, S. +2 more
Baryonic matter in geospace is almost exclusively in a plasma state, with protons (H+) and to some extent ionized helium (He) and oxygen (O) being the dominant ion species. But also other heavier ion species and even molecular ions are present in geospace. The Research with Adaptive Particle Imaging Detectors (RAPID) on board the Cluste…
Transiting exoplanets from the CoRoT space mission. XXIX. The hot Jupiters CoRoT-30 b and CoRoT-31 b
Mazeh, T.; Aigrain, S.; Alonso, R. +31 more
Aims: We report the discovery as well as the orbital and physical characterizations of two new transiting giant exoplanets, CoRoT-30 b and CoRoT-31 b, with the CoRoT space telescope.
Methods: We analyzed two complementary data sets: photometric transit light curves measured by CoRoT, and radial velocity curves measured by the HARPS spect…
Interplanetary Magnetic Flux Rope Observed at Ground Level by HAWC
Alvarez, C.; Kieda, D.; Nieves-Chinchilla, T. +59 more
We report the ground-level detection of a Galactic cosmic-ray (GCR) flux enhancement lasting ∼17 hr and associated with the passage of a magnetic flux rope (MFR) over the Earth. The MFR was associated with a slow coronal mass ejection (CME) caused by the eruption of a filament on 2016 October 9. Due to the quiet conditions during the eruption and …
Optical Identification of Four Hard X-ray Sources from the INTEGRAL Sky Surveys
Medvedev, P. S.; Sazonov, S. Yu.; Eselevich, M. V. +8 more
We continue the study begun in Karasev et al. (2018) and present the results of our optical identifications of four hard X-ray sources from the INTEGRAL sky surveys. Having first improved the positions of these objects in the sky with the X-ray telescope (XRT) of the Swift observatory, we have identified their counterparts using optical and infrar…
Follow-up Ground-based Observations of the Dwarf Nova KZ Gem
Thorstensen, John R.; Szkody, Paula; Dai, Zhibin +1 more
We present spectroscopy of stars in the immediate vicinity of the dwarf nova (DN) KZ Gem to confirm its identification, which is ambiguous in the literature. Analysis of 73 radial velocities spanning from 2014 to 2019 provides a high-precision orbital period of 0.2224628(2) days (∼5.34 hr) and shows KZ Gem to be a double-lined DN. Time series phot…
SMA observations of Haro 2: molecular gas around a hot superbubble
Beck, Sara C.; Hsieh, Pei-Ying; Turner, Jean
Haro 2, a nearby dwarf starburst dwarf galaxy with strong Ly α emission, hosts a starburst that has created outflows and filaments. The clear evidence for galactic outflow makes it an ideal candidate for studying the role of molecular gas in feedback processes in a dwarf galaxy. We observed CO(2-1) in Haro 2 at the Submillimeter Array in the compa…
Dayside-to-nightside dust coma brightness asymmetry and its implications for nightside activity at Comet 67P/Churyumov-Gerasimenko
Thomas, N.; Marschall, R.; Wu, J. -S. +2 more
We have determined the dust coma brightness ratio between the dayside and the nightside (DS:NS) in OSIRIS images of comet 67P/Churyumov-Gerasimenko and compared them to results from numerical dust coma simulations to learn more about the dynamic processes that are involved in coma formation. The primary focus of this paper lies in the analysis of …