Search Publications
Surface thermophysical properties determination of OSIRIS-REx target asteroid (101955) Bennu
Yu, LiangLiang; Ji, Jianghui
In this work, we investigate the thermophysical properties of OSIRIS-REx target asteroid (101955) Bennu (hereafter Bennu), where thermal inertia plays an important role in understanding the nature of the asteroid's surface, and will definitely provide substantial information for the sampling return mission. Using a thermophysical model incorporati…
The link between mass distribution and starbursts in dwarf galaxies
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Skillman, Evan D. +3 more
Recent studies have shown that starburst dwarf galaxies have steeply rising rotation curves in their inner parts, pointing to a close link between the intense star formation and a centrally concentrated mass distribution (baryons and dark matter). More quiescent dwarf irregulars typically have slowly rising rotation curves, although some `compact'…
Search for sub-kilometre trans-Neptunian objects using CoRoT asteroseismology data
Chang, Hsiang-Kuang; Doressoundiram, Alain; Auvergne, Michel +3 more
We present the search for sub-kilometre trans-Neptunian objects (TNOs) by re-examining the CoRoT (Convection Rotation and Planetary Transits) asteroseismology observations. The total observation time employed in this work is about 144 000 star hours with signal-to-noise ratio larger than 1000 computed on 30-s intervals. 13 Possible Occultation Eve…
The Chandra/HETG view of NGC 1365 in a Compton-thick state
Reeves, J. N.; Braito, V.; Gofford, J. +3 more
We present the analysis of a Chandra High-Energy Transmission Grating (HETG) observation of the local Seyfert galaxy NGC 1365. The source, well known for its dramatic X-ray spectral variability, was caught in a reflection-dominated, Compton-thick state. The high spatial resolution afforded by Chandra allowed us to isolate the soft X-ray emission f…
A method of complex background estimation in astronomical images
Popowicz, A.; Smolka, B.
In this paper, we present a novel approach to the estimation of strongly varying backgrounds in astronomical images by means of small-objects removal and subsequent missing pixels interpolation. The method is based on the analysis of a pixel local neighbourhood and utilizes the morphological distance transform. In contrast to popular background-es…
Differences in the fast optical variability of the dwarf nova V1504 Cyg between quiescence and outbursts detected in Kepler data and simulations of the rms-flux relations
Ness, J. -U.; Dobrotka, A.
An optical light curve of SU UMa type dwarf nova V1504 Cyg taken by Kepler was analysed in order to study fast optical variability (flickering). We calculated power density spectra and rms-flux relations for two different stages of activity, i.e. quiescence and regular outbursts. A multicomponent power density spectrum with two break frequencies w…
A multiwavelength study of the M dwarf binary YY Geminorum
Bromage, G. E.; Doyle, J. G.; Foing, B. +8 more
We review the results of the 1988 multiwavelength campaign on the late-type eclipsing binary YY Geminorum. Observations include: broad-band optical and near-infrared photometry, simultaneous optical and ultraviolet (IUE) spectroscopy, X-ray (Ginga) and radio (VLA) data. From models fitted to the optical light curves, fundamental physical parameter…
Doppler disc tomography applied to low-mass AGN spin
Middleton, Matthew J.; Ingram, Adam R.
Doppler tomography can provide a powerful means of determining black hole spin when our view to the central regions are revealed and obscured by optically thick orbiting material, and can provide an independent estimate that does not suffer as many degeneracies as traditional methods. For low-mass active galactic nuclei (AGN), time-dependent obscu…
Compensated-current instability of kinetic Alfvén waves
De Keyser, J.; Malovichko, P.; Voitenko, Y.
We study a non-resonant instability of kinetic Alfvén waves (KAWs) driven by compensated currents. Such currents set up in response to energetic ion beams occurring in many space and astrophysical plasmas, like foreshock regions in the solar wind and around supernova remnants. Kinetic effects of the background ion gyroradius make the KAW instabili…
Millimetre polarization of the protoplanetary nebula OH 231.8+4.2: a follow-up study with CARMA
Zijlstra, A. A.; Sabin, L.; Vázquez, R. +4 more
In order to investigate the characteristics and influence of the magnetic field in evolved stars, we performed a follow-up investigation of our previous submillimetre analysis of the protoplanetary nebula (PPN) OH 231.8+4.2, this time at 1.3 mm with the CARMA (Combined Array for Research in Millimeter-wave Astronomy) facility in polarization mode …