Search Publications
Exoplanet Detection by Astrometric Method
Xu, W. W.; Liao, X. H.; Zhou, Y. H. +1 more
As we known, the exoplanets are mostly detected by the methods of radial velocity and transit, only one is found by the astrometric method. As the data of the gaia to be released, astrometry will become one of the most important method for detecting exoplanets gradually. Based on the position sequence of stars, this paper discusses the calculation…
Hard X-Ray Tail Discovered in the Clocked Burster GS 1826-238
Jourdain, E.; Roques, J. P.; Rodi, J.
The low-mass X-ray binary (LMXB) neutron star (NS) GS 1826-238 was discovered by Ginga in 1988 September. Due to the presence of quasi-periodicity in the type I X-ray burst rate, the source has been a frequent target of X-ray observations for almost 30 years. Though the bursts were too soft to be detected by INTEGRAL/SPI, the persistent emission f…
Ultraviolet spectral synthesis of HD 72660
Landstreet, J. D.; Golriz, S. S.
The study of chemical abundances in stellar atmosphere provides a useful tool to investigate the formation and evolution history of stars. The optical wavelength range has been used almost exclusively in the past to determine the elemental abundance in A-type stars. We use high-resolution, high signal-to-noise ultraviolet spectra obtained from the…
Electron densities in the ionosphere of Mars: A comparison of MARSIS and radio occultation measurements
Withers, Paul; Vogt, Marissa F.; Fallows, Kathryn +4 more
Radio occultation electron densities measurements from the Mariner 9 and Viking spacecraft, which orbited Mars in the 1970s, have recently become available in a digital format. These data are highly complementary to the radio occultation electron density profiles from Mars Global Surveyor, which were restricted in solar zenith angle and altitude. …
Constraining MOND using the vertical motion of stars in the solar neighbourhood
Margalit, Ben; Shaviv, Nir J.
Stars with a different vertical motion relative to the Galactic disc have a different average acceleration. According to modified Newtonian dynamics (MOND) theories, they should therefore have a different average orbital velocity while revolving around the Milky Way. We show that this property can be used to constrain MOND theories by studying sta…
A plausible link between the asteroid 21 Lutetia and CH carbonaceous chondrites
Fornasier, Sonia; Barucci, Maria A.; Trigo-Rodríguez, Josep M. +3 more
A crucial topic in planetology research is establishing links between primitive meteorites and their parent asteroids. In this study, we investigate the feasibility of a connection between asteroids similar to 21 Lutetia, encountered by the Rosetta mission in July 2010, and the CH3 carbonaceous chondrite Pecora Escarpment 91467 (PCA 91467). Severa…
Isotropy-violation diagnostics for B-mode polarization foregrounds to the Cosmic Microwave Background
Huffenberger, Kevin; Rotti, Aditya
Isotropy-violation statistics can highlight polarized galactic foregrounds that contaminate primordial B-modes in the Cosmic Microwave Background (CMB). We propose a particular isotropy-violation test and apply it to polarized Planck 353 GHz data, constructing a map that indicates B-mode foreground dust power over the sky. We build our main isotro…
Smoothing methods comparison for CMB E- and B-mode separation
Wang, Yi-Fan; Wang, Kai; Zhao, Wen
The anisotropies of the B-mode polarization in the cosmic microwave background radiation play a crucial role in the study of the very early Universe. However, in real observations, a mixture of the E-mode and B-mode can be caused by partial sky surveys, which must be separated before being applied to a cosmological explanation. The separation meth…
Acoustic and Slow Sausage Oscillations in the Stratified Solar Photosphere: Hinode Observations and Phase Relationships
Tsap, Y. T.; Stepanov, A. V.; Kopylova, Y. G.
Based on the linearized magnetohydrodynamic (MHD) equations within the framework of the thin flux tube approximation, the phase relationships between the disturbed quantities of evanescent acoustic and slow sausage MHD modes excited in the adiabatically stratified solar atmosphere are considered. It has been shown that the sign of the phase differ…
A systematic study of evolved supernova remnants in the large and small Magellanic Clouds with Suzaku
Yamaguchi, Hiroya; Tamagawa, Toru; Takeuchi, Yoko
Identifying the origin type (i.e., Type Ia or core-collapse) of supernova remnants (SNRs) is crucial to determining the rates of supernova (SN) explosions in a galaxy, which is a key to understanding its recent chemical evolution. However, evolved SNRs in the so-called Sedov phase are dominated by the swept-up interstellar medium (ISM), making it …