Search Publications
Observations of NEO and Main Belt asteroids in 2018-2021 using the Baldone Schmidt telescope
Eglitis, I.; Bule, A.; Sokolova, A. +1 more
During 2018–2021 in the Baldone observatory, 49 new asteroids were discovered and more than 6000 astrometric positions for 1122 asteroids were published in MPC circulars. In this period in 221 observation nights, 5544 CCD images were obtained, which covered 648 square degrees of sky. Of them, about 1000 CCD images were devoted to studying the dyna…
Correction to: Observation of a Flare and Filament Eruption in Lyman-α on 8 September 2011 by the PRoject for OnBoard Autonomy/Large Yield Radiometer (PROBA2/LYRA)
Kretzschmar, M.; Dammasch, I. E.; Dominique, M. +3 more
On the dynamical and morphological state of the CHEX-MATE clusters
Lovisari, Lorenzo; Ettori, Stefano; Campitiello, Maria Giulia +1 more
The CHEX-MATE sample was built to provide an overview of the statistical properties of the underlying cluster population and to set the stage for future X-ray missions. In this work, we perform a morphological analysis of the 118 clusters included in the sample with the aim to provide a classification of their dynamical state which will be useful …
Current Sheet Thinning in the Wake of a Bubble Injection
Nakamura, Rumi; Yang, Jian; Cui, Jun +3 more
A crucial property of the substorm growth phase is the current sheet thinning, which is often attributed to adiabatic convection. Injecting low-entropy bubbles reduce pressure-balance inconsistencies and restore current sheet thickness to its initial value. Recent observations from Cluster and MMS showed additional thinning of the current sheet in…
Tripolar guide magnetic fields due to island coalescence in solar wind current sheets: Simulation and theory
Newman, David L.; Eriksson, Stefan; Lapenta, Giovanni
Reconnecting current sheets (CSs) in the solar wind near 1 AU have been previously identified that exhibit a modified Hall magnetic field perturbation of the nominal guide field characterized by a "tripolar" structure with depressions on both sides of a central maximum [Eriksson et al., Astrophys. J. 805, 43 (2015)]. Such CSs were inferred to cont…
Co-rotating Solar Wind Disturbances in Radio Sounding Data and Local Measurements
Efimov, A. I.; Smirnov, V. M.; Chashei, I. V. +1 more
In this paper, we present the results of two series of experiments on radio sounding of near-solar plasma by the signals of the Mars Express and Venus Express spacecraft in 2006 and Mars Express in 2008. The radio sounding data are compared with measurements of the proton concentration near the Earth's orbit on the Wind satellite. This analysis sh…
The first photometric analysis study of the GW Psc binary system
Tanrıver, Mehmet; Bulut, Ahmet
The first photometric solution in the B , V ,Rc and Ic filters of the short period GW Psc eclipsing binary is presented based on new ground-based CCD photometric observations. We analysed the BVRI photometric light curves of the system, using Phoebe0.31a, a binary star modelling program, with the Wilson and Devinney (Wilson a…
X-Ray Spectra from Weakly Magnetized Accretion Flows
Pe'er, Asaf; Wallace, John
In this paper, we expand upon previous work that argued for the possibility of a subequipartition magnetic field in the accretion flow of a black hole binary system. Using X-ray observations of the three well-known sources A0620-00, XTE J1118+480, and V404 Cyg during the quiescent state, we compare the theoretically expected spectral shape with th…
WX Cen is X‑ray quiet: Does this signify a high‑mass or a low‑mass binary?
Zhekov, Svetozar A.
We present results from analysis of the XMM–Newton observation (2021 February) of the enigmatic object WX Cen: a presumed massive Wolf–Rayet (WR) binary, (WN3 + WC4), or a low‑mass binary. WX Cen was not detected in X‑rays. Its UV emission shows periodic variability with a period (0.405–0.434 day) similar to that found in the optical for this obje…
The orbital architecture and stability of the µ Arae planetary system
Goździewski, K.
We re-analyse the global orbital architecture and dynamical stability of the HD 160691 planetary system. We have updated the best-fitting elements and minimal masses of the planets based on literature precision radial velocity (RV) measurements, now spanning 17.3 yr. This is twice the RVs interval used for the first characterization of the system …