Search Publications
The triple system HD 150136: From periastron passage to actual masses
Gosset, E.; Manfroid, J.; Sana, H. +6 more
Context. The triple system HD 150136 is composed of an O3 V((f*))-O3.5 V((f+)) primary, of an O5.5-6 V((f)) secondary, and of a more distant O6.5-7 V((f)) tertiary. The latter component went through periastron in 2015-2016, an event that will not occur again within the next eight years.
Aims: We aim to analyse the tertia…
Spatial prediction of near surface soil water retention functions using hydrogeophysics and empirical orthogonal functions
Gibson, Justin; Franz, Trenton E.
The hydrological community often turns to widely available spatial datasets such as the NRCS Soil Survey Geographic database (SSURGO) to characterize the spatial variability of soil properties. When used to spatially characterize and parameterize watershed models, this has served as a reasonable first approximation when lacking localized or incomp…
FUV line emission, gas kinematics, and discovery of [Fe XXI] λ1354.1 in the sightline toward a filament in M87
Anderson, Michael E.; Sunyaev, Rashid
We present new Hubble Space Telescope - Cosmic Origins Spectrograph (HST-COS) G130M spectroscopy which we have obtained for a sightline toward a filament projected 1.9 kpc from the nucleus of M87, near the edge of the inner radio lobe to the east of the nucleus. The combination of the sensitivity of COS and the proximity of M87 allows us to study …
Solar Coronal Modeling by Path-conservative HLLEM Riemann Solver
Feng, Xueshang; Wei, Fengsi; Li, Caixia +3 more
In this paper, we employ a path-conservative HLLEM finite-volume method (FVM) to solve the solar wind magnetohydrodynamics (MHD) systems of extended generalized Lagrange multiplier (EGLM) formulation with Galilean invariance (G-EGLM MHD equations). The governing equations of single-fluid solar wind plasma MHD are advanced by using a one-step MUSCL…
Nonlinear Effects in Three-minute Oscillations of the Solar Chromosphere. II. Measurement of Nonlinearity Parameters at Different Atmospheric Levels
Chae, Jongchul; Cho, Kyuhyoun; Song, Donguk +1 more
Recent theoretical studies suggest that the nonlinearity of three-minute velocity oscillations at each atmospheric level can be quantified by the two independent parameters—the steepening parameter and the velocity amplitude parameter. For the first time, we measured these two parameters at different atmospheric levels by analyzing a set of spectr…
Inflation with Planck data: A survey of some exotic inflationary models
Gomes, Cláudio; Bertolami, Orfeu; Rosa, João G.
We examine some inflationary models based on modifications of gravity in the light of Planck 2015 data, such as the generalized Chaplygin inspired inflation, models based in N =1 supergravity and braneworld scenarios. We also show that, conversely, potentials with a very flat plateau yield a primordial spectrum similar to that of the Starobinsky m…
Suzaku observations of the Monogem Ring and the origin of the Gemini H α ring
Sasaki, Manami; Plucinsky, Paul P.; Knies, Jonathan R.
We present the analysis of Suzaku X-ray observations of the Galactic supernova remnant (SNR) `Monogem Ring', a large structure observed in X-rays with an extent of ≈25°, located at an anticentre position. One observation close to the shock also coincides with a large ring-like structure observed in H α, which is called the `Gemini H α ring'. We in…
CXOU J160103.1-513353: another central compact object with a carbon atmosphere?
Santangelo, A.; Doroshenko, V.; Suleimanov, V.
We report on the analysis of XMM-Newton observations of the central compact object CXOU J160103.1-513353 located in the center of the non-thermally emitting supernova remnant (SNR) G330.2+1.0. The X-ray spectrum of the source is well described with either single-component carbon or two-component hydrogen atmosphere models. In the latter case, the …
Actuation crosstalk in free-falling systems: Torsion pendulum results for the engineering model of the LISA pathfinder gravitational reference sensor
Grado, A.; Cavalleri, A.; Dolesi, R. +17 more
In this paper we report on measurements on actuation crosstalk, relevant to the gravitational reference sensors for LISA Pathfinder and LISA. In these sensors, a Test Mass (TM) falls freely within a system of electrodes used for readout and control. These measurements were carried out on ground with a double torsion pendulum that allowed us to est…
Long-term X-ray variability characteristics of the narrow-line Seyfert 1 galaxy RE J1034+396
Singh, K. P.; Rao, A. R.; Dewangan, G. C. +8 more
We present the results of our study of the long-term X-ray variability characteristics of the narrow-line Seyfert 1 galaxy RE J1034+396. We use data obtained from the AstroSat satellite along with light curves obtained from XMM-Newton and Swift-XRT. We use the 0.3-7.0 keV and 3-20 keV data, respectively, from the SXT and the LAXPC of AstroSat. The…