Search Publications
The serendipituous discovery of a short-period eclipsing polar in 2XMMp
Watson, M. G.; Schwope, A.; Osborne, J. P. +3 more
We report the serendipituous discovery of the new eclipsing polar 2XMMp J131223.4+173659. Its striking X-ray light curve attracted immediate interest when we were visually inspecting the source products of the 2XMMp catalogue. This light curve revealed its likely nature as a magnetic cataclysmic variable of AM Herculis (or polar) type with an orbi…
NGC 602 Environment, Kinematics and Origins
Sabbi, E.; Nota, A.; Gallagher, J. S. +3 more
The young star cluster NGC 602 and its associated HII region, N90, formed in a relatively isolated and diffuse environment in the Wing of the Small Magellanic Cloud. Its isolation from other regions of massive star formation and the relatively simple surrounding HI shell structure allows us to constrain the processes that may have led to its forma…
Validating Time-Distance Far-Side Imaging of Solar Active Regions through Numerical Simulations
Zhao, Junwei; Kosovichev, Alexander G.; Hartlep, Thomas +1 more
Far-side imaging using time-distance helioseismology methods is assessed using numerically generated artificial data. The data are generated using direct numerical simulations of acoustic oscillations in a spherical solar model. Localized variations of the sound speed in the surface and subsurface layers are used to model the perturbations associa…
Isotopic Ratios in Titan's Atmosphere from Cassini CIRS Limb Sounding: HC3N in the North
Irwin, P. G. J.; Teanby, N. A.; Flasar, F. M. +8 more
This Letter reports the first detection of the three 13C isotopologues of HC3N on Titan, from Cassini Composite Infrared Spectrometer (CIRS) infrared spectra. The data are limb spectra taken at latitudes N54°-N69° in 2006 and 2007 when HC3N was enhanced in the north. Using a new line list for the ν5 band…
The Venusian induced magnetosphere: A case study of plasma and magnetic field measurements on the Venus Express mission
Coates, A. J.; Kallio, E.; Fedorov, A. +49 more
Plasma and magnetic field measurements made onboard the Venus Express on June 1, 2006, are analyzed and compared with predictions of a global model. It is shown that in the orbit studied, the plasma and magnetic field observations obtained near the North Pole under solar minimum conditions were qualitatively and, in many cases also, quantitatively…
Observational consequences of the recently proposed Super-Earth orbiting GJ 436
Bean, J. L.; Seifahrt, A.
Ribas and collaborators have recently proposed that an additional, ~5 M⊕ planet orbits the transiting planet host star GJ 436. Long-term dynamical interactions between the two planets leading to eccentricity excitation might provide an explanation for the transiting planet's unexpectedly large orbital eccentricity. We examine whether th…
Seismic Emissions from a Highly Impulsive M6.7 Solar Flare
Moradi, H.; Donea, A. -C.; Martínez-Oliveros, J. C.
On 10 March 2001 the active region NOAA 9368 produced an unusually impulsive solar flare in close proximity to the solar limb. This flare has previously been studied in great detail, with observations classifying it as a type 1 white-light flare with a very hard spectrum in hard X-rays. The flare was also associated with a type II radio burst and …
Access of solar wind electrons into the Martian magnetosphere
Barabash, S.; Lundin, R.; Winningham, J. D. +7 more
Electrons with energy of ~40 80 eV measured by the instrument ASPERA-3 on Mars Express and MAG-ER onboard Mars Global Surveyor are used to trace an access of solar wind electrons into the Martian magnetosphere. Crustal magnetic fields create an additional protection from solar wind plasma on the dayside of the Southern Hemisphere by shifting the b…
New absolute magnitude calibrations for detached binaries
Demircan, O.; Eker, Z.; Soydugan, F. +6 more
Lutz-Kelker bias corrected absolute magnitude calibrations for the detached binary systems with main-sequence components are presented. The absolute magnitudes of the calibrator stars were derived at intrinsic colours of Johnson-Cousins and 2MASS (Two Micron All Sky Survey) photometric systems. As for the calibrator stars, 44 detached binaries wer…
Low-Frequency Lyα Power Spectra Observed by UVCS in a Polar Coronal Hole
Bemporad, A.; Poletto, G.; Matthaeus, W. H.
The occurrence of f-1 noise in interplanetary magnetic fields (in the 1 × 10-5 to 1 × 10-4 Hz band) and other plasma parameters has now been known for about 20 years and has been recently identified also in the photospheric magnetic fields. However, the relationship between interplanetary and solar fluctuation spec…