Search Publications
Influence of the dynamic classification of asteroids on observation astrometric errors: a statistical analysis
Stronati, N.; Faggioli, L.; Micheli, M. +1 more
The ephemerides of minor planets are computed on the basis of astrometric observations. The asteroid orbit determination process requires these observations to be properly weighted to take into account the expected accuracy of the data. If not directly provided by the observers, the weights are, in general, computed after a station-specific statis…
Links between optical and X-ray light in Scorpius X-1
Britt, C. T.; Hynes, R. I.; Igl, Alexander B. +2 more
We observed the low-mass X-ray binary Sco X-1 for 12 nights simultaneously using the Rossi X-Ray Timing Explorer and the Otto Struve Telescope at McDonald Observatory at 1-s time-resolution. This is among the most comprehensive simultaneous X-Ray/optical data sets of Sco X-1. Evidence of reprocessing was observed in the form of nine positive, near…
Asteroseismology of the DAV star KUV 08368+4026
Yang, Y. H.; Chen, Y. H.; Tang, M. Y.
As a DAV star, KUV 08368+4026 was observed by Li et al. in 2009 February, 2009 December, 2010 January, and 2012 February. They extracted 30 frequencies from the reported 300 h observation data and identified 17 independent modes. Based on the frequency splitting relationship, 6 l = 1 modes and 1 l = 2 mode are identified. The seven identified mode…
Estimating the optical depth of Saturn's main rings using the Cassini Langmuir Probe
Arridge, Christopher S.; Wahlund, Jan-Erik; Xystouris, Georgios +1 more
A Langmuir Probe (LP) measures currents from incident charged particles as a function of the applied bias voltage. While onboard a spacecraft the particles are either originated from the surrounding plasma, or emitted (e.g. through photoemission) from the spacecraft itself. The obtained current-voltage curve reflects the properties of the plasma i…
The composition and thermal properties of a cool core lacking a brightest cluster galaxy
Combes, Francoise; Su, Yuanyuan; Olivares, Valeria +3 more
We present a multiwavelength observation of a cool core that does not appear to be associated with any galaxy, in a nearby cluster, Abell 1142. Its X-ray surface brightness peak of ≲2 keV is cooler than the ambient intracluster gas of ≳3 keV, and is offset from its brightest cluster galaxy (BCG) by 80 kpc in projection, representing the largest kn…
Modelling simultaneous CoRoT and Spitzer light curves: the impact of bending waves in the inner disc
Nagel, E.; Bouvier, J.
We present a physical interpretation of the amplitude of light curves of young stellar objects (YSOs) simultaneously observed in the infrared with the Spitzer Space Telescope and in the optical with the CoRoT satellite. The modelled objects come from a sample of YSOs in the star forming region NGC 2264, and we focus on a subsample showing periodic…
Spectral and timing analysis of BeXRB eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC)
Tobrej, Mohammed; Rai, Binay; Ghising, Manoj +2 more
We have studied the Be/X-ray binary (BeXRB) pulsar eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC). Timing and spectral features of the source have been discussed in detail using NuSTAR and XMM-Newton observations. Coherent pulsation of the source was detected at ~40.578 ± 0.001 s using NuSTAR observation. We analys…
Photometric long-term variations of dwarf novae during quiescence
Vogt, N.; Vega-Manubens, I.
Using the Catalina Sky Survey and Gaia alert data bases, we have carried out a systematic search for long-term variability of the brightness of dwarf novae in quiescence. A small, but significant portion of them revealed variability on time-scales between 2 and 14 yr which can be fitted, in some of the targets, by linear slopes of 0.14 mag yr…
Unravelling optical and X-ray properties of the disc-dominated intermediate polar IGR J15094-6649
Pandey, J. C.; Scaringi, Simone; Schwope, Axel +5 more
We present analyses of an Intermediate Polar, IGR J15094-6649, based on the archival optical data obtained from the Transiting Exoplanet Survey Satellite (TESS) and X-ray data obtained from the Suzaku, NuSTAR, and Neil Gehrels Swift Observatory (Swift). Present analysis confirms and refines the previously reported spin period of IGR J15094-6649 as…
A three-dimensional chemical simulation with irregular density distributions of L1544
Mardones, Diego; Ge, Jixing; Inostroza-Pino, Natalia +1 more
The dust continuum and molecular distributions observed on the sky plane always show irregular shapes of molecular clouds. However, it is hard to directly reproduce the observed distributions using symmetrical models. In this work, for the first time, we present a three-dimensional (3D) gas-grain chemical simulation using an irregular 3D density s…