Search Publications
CO Cameron band and CO2+ UV doublet emissions in the dayglow of Venus: Role of CO in the Cameron band production
Bhardwaj, Anil; Jain, Sonal Kumar
The present study deals with the model calculations of CO Cameron band and CO2+ ultraviolet doublet emissions in the dayglow of Venus. The overhead and limb intensities of CO Cameron band and CO2+ UV doublet emissions are calculated for low, moderate, and high solar activity conditions. Using updated cross sections, the impact of different e-CO cr…
X-ray irradiation and mass-loss of the hot Jupiter WASP-43b
Schmitt, J. H. M. M.; Czesla, S.; Salz, M. +1 more
We report the X-ray detection of the low-mass K7V star WASP-43, which is orbited by a hot Jupiter in one of the closest exoplanet orbits known to date. The high mean density of the planet implies a massive core with ≈130 M⊕, yielding a heavy-element mass-fraction of 20%. From an 18 ks long XMM-Newton observation, we derive an X-ray lumi…
Stokes imaging of AM Her systems using 3D inhomogeneous models - II. Modelling X-ray and optical data of CP Tucanae
Costa, J. E. R.; Rodrigues, C. V.; Silva, K. M. G. +3 more
The viewing geometry of the polar CP Tuc that better explains its optical and X-ray light curves is controversial. Previous modelling of white-light polarimetric data considered the partial self-eclipse of an extended inhomogeneous emitting region. Alternatively, phase-dependent absorption has been used to reproduce the X-ray data. This paper pres…
Simultaneous X-Ray and Radio Observations of Rotating Radio Transient J1819-1458
Rea, N.; Kramer, M.; McLaughlin, M. A. +4 more
We present the results of simultaneous radio and X-ray observations of PSR J1819-1458. Our 94 ks XMM-Newton observation of the high magnetic field (~5 × 1013 G) pulsar reveals a blackbody spectrum (kT ~ 130 eV) with a broad absorption feature, possibly composed of two lines at ~1.0 and ~1.3 keV. We performed a correlation analysis of th…
The X-ray properties of optically selected clusters of galaxies
Böhringer, H.; Pratt, G. W.; Croston, J. H. +7 more
We present the results of Chandra and Suzaku X-ray observations of nine moderate-redshift (0.16 < z < 0.42) clusters discovered via the Red-sequence Cluster Survey (RCS). Surface brightness profiles are fitted to β-models, gas masses are determined, integrated spectra are extracted within R2500, and X-ray temperatures and luminosi…
Swift J045106.8-694803: a highly magnetized neutron star in the Large Magellanic Cloud
Udalski, A.; Bartlett, E. S.; Bird, A. J. +3 more
We report the analysis of a highly magnetized neutron star in the Large Magellanic Cloud (LMC). The high-mass X-ray binary pulsar Swift J045106.8-694803 has been observed with Swift X-ray telescope (XRT) in 2008, the Rossi X-ray Timing Explorer (RXTE) in 2011 and the X-ray Multi-Mirror Mission-Newton (XMM-Newton) in 2012. The change in spin period…
Discovery of the spectroscopic binary nature of three bright southern Cepheids
Szabados, L.; Derekas, A.; Anderson, R. I. +4 more
We present an analysis of spectroscopic radial velocity and photometric data of three bright Galactic Cepheids: LR Trianguli Australis (LR TrA), RZ Velorum (RZ Vel) and BG Velorum (BG Vel). Based on new radial velocity data, these Cepheids have been found to be members of spectroscopic binary systems. The ratio of the peak-to-peak radial velocity …
IRAS 19520+2759: a 105 L⊙ massive young stellar object driving a collimated outflow
Sahai, R.; Sánchez Contreras, C.; Palau, Aina +2 more
The theory of massive star formation currently suffers from a scarce observational base of massive young stellar objects to compare with. In this paper, we present interferometric 12CO (1-0), 13CO (1-0), C18O (1-0) and 2.6 mm continuum images of the infrared source IRAS 19520+2759 together with complementary single…
A one-sided knot ejection at the core of the HH 111 outflow
Loinard, L.; Rodríguez, L. F.; Gómez, L.
We present an astrometry study of the radio source VLA 1 at the core of the HH 111 outflow using new data (2007) as well as archival observations (1992-1996). All data were taken at 3.6 cm with the Very Large Array in its most extended (A) configuration. The source VLA 1 has undergone a dramatic morphological change, showing a one-sided knot eject…
Coronal magnetic field strength from Type II radio emission: complementarity with Faraday rotation measurements
Mancuso, S.; Garzelli, M. V.
We analyzed the band splitting of a Type II radio burst observed on 1997 May 12 by ground- and space-based radio spectrometers. Type II radio emission is the most evident signature of coronal shock waves and the observed band splitting is generally interpreted as due to plasma emission from both upstream and downstream shock regions. From the infe…