Search Publications
Location and sizes of forsterite grains in protoplanetary disks. Interpretation from the Herschel DIGIT programme
Waters, L. B. F. M.; Dominik, C.; Tielens, A. G. G. M. +4 more
Context. The spectra of protoplanetary disks contain mid- and far- infrared emission features produced by forsterite dust grains. The spectral features contain information about the forsterite temperature, chemical composition and grain size.
Aims: We aim to characterize how the 23 and 69 µm features can be used to constrain the physica…
Hyper: Hybrid photometry and extraction routine
Pezzuto, S.; Fuller, G. A.; Traficante, A. +1 more
We present a new hybrid photometry and extraction routine called Hyper. It is designed to do compact source photometry, allowing for varying spatial resolution and sensitivity in multi-wavelength surveys. Hyper combines multi-Gaussian fitting with aperture photometry to provide reliable photometry in regions with variable backgrounds and in crowde…
BEER analysis of Kepler and CoRoT light curves. III. Spectroscopic confirmation of seventy new beaming binaries discovered in CoRoT light curves
Mazeh, T.; Tal-Or, L.; Faigler, S.
Context. The BEER algorithm searches stellar light curves for the BEaming, Ellipsoidal, and Reflection photometric modulations that are caused by a short-period companion. These three effects are typically of very low amplitude and can mainly be detected in light curves from space-based photometers. Unlike eclipsing binaries, these effects are not…
LUT Reveals a New Mass-transferring Semi-detached Binary
Zhang, J.; Zejda, M.; Zhang, B. +6 more
GQ Dra is a short-period eclipsing binary in a double stellar system that was discovered by Hipparcos. Complete light curves in the UV band were obtained with the Lunar-based Ultraviolet Telescope in 2014 November and December. Photometric solutions are determined using the W-D (Wilson and Devinney) method. It is discovered that GQ Dra is a classi…
Relationship between X-ray spectral index and X-ray Eddington ratio for Mrk 335 and Ark 564
Misra, R.; Tripathi, S.; Pathak, A. +3 more
We present a comprehensive flux-resolved spectral analysis of the bright narrow-line Seyfert 1 AGNs, Mrk 335 and Ark 564 using observations by XMM-Newton satellite. The mean and the flux-resolved spectra are fitted by an empirical model consisting of two Comptonization components, one for the low-energy soft excess and the other for the high-energ…
Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae
Wijnands, R.; Rivera-Sandoval, L. E.; van den Berg, M. +11 more
We report the discovery of the likely white dwarf companions to radio millisecond pulsars 47 Tuc Q and 47 Tuc S in the globular cluster 47 Tucanae. These blue stars were found in near-ultraviolet images from the Hubble Space Telescope for which we derived accurate absolute astrometry, and are located at positions consistent with the radio coordina…
Space weather effects on the bow shock, the magnetic barrier, and the ion composition boundary at Venus
Kallio, E.; Szego, K.; Fraenz, M. +4 more
We present a statistical study on the interaction between interplanetary coronal mass ejections (ICMEs) and the induced magnetosphere of Venus when the peak magnetic field of the magnetic barrier was anomalously large (>65 nT). Based on the entire available Venus Express data set from April 2006 to October 2014, we selected 42 events and analyz…
Are 3-D coronal mass ejection parameters from single-view observations consistent with multiview ones?
Moon, Y. -J.; Jang, Soojeong; Lee, Harim +2 more
To prepare for when only single-view observations are available, we have made a test whether the 3-D parameters (radial velocity, angular width, and source location) of halo coronal mass ejections (HCMEs) from single-view observations are consistent with those from multiview observations. For this test, we select 44 HCMEs from December 2010 to Jun…
Ionization balance in Titan's nightside ionosphere
Coates, A. J.; Wahlund, J. -E.; Edberg, N. J. T. +10 more
Based on a multi-instrumental Cassini dataset we make model versus observation comparisons of plasma number densities, nP = (nenI)1/2 (ne and nI being the electron number density and total positive ion number density, respectively) and short-lived ion number densities (N+…
X-Ray Emission from J1446--4701, J1311--3430, and Other Black Widow Pulsars
Pavlov, George G.; Garmire, Gordon P.; Arumugasamy, Prakash
We present the results of detailed X-ray analysis of two black-widow pulsars (BWPs), J1446-4701 and J1311-3430. PSR J1446-4701 is a BWP with orbital parameters near the median values of the sample of known BWPs. Its X-ray emission that was detected by XMM-Newton is well characterized by a soft power-law (PL) spectrum (photon index Γ ≈ 3), and it s…