Search Publications
Investigation of mid-infrared long-term variability of dusty AGB stars using multi-epoch scan data of AKARI and WISE
Takita, Satoshi; Ita, Yoshifusa; Tachibana, Kengo +5 more
Asymptotic giant branch (AGB) stars are one of the main sources of dust in the Universe. They form and supply dust triggered by stellar pulsations, but the details of the mechanism are still unknown. Among all AGB stars, dusty AGB stars are the most important in terms of dust supply because they contain the star with a high mass-loss rate. To inve…
A spectroscopic measurement of high velocity spray plasma from an M-class flare and coronal mass ejection
Young, Peter R.
The M1.5-class flare and associated coronal mass ejection (CME) of 16 February 2011 was observed with the Extreme ultraviolet Imaging Spectrometer on board the Hinode spacecraft. Spray plasma associated with the CME is found to exhibit a Doppler blue-shift of 850 km s-1 - one of the largest values reported from spectroscopy of the solar…
Effect of the Eccentricity of the Planet's Orbit on the Limb Darkening Coefficients of the Eclipsed Star
Cherepashchuk, A. M.; Bekesov, E. V.
It is shown that the introduction of a small orbital eccentricity into the model of a binary system with an exoplanet, which is allowed by errors in determining the radial velocities of the eclipsed star, makes possible to significantly reduce and even eliminate the difference in the wavelength dependences between the observed and theoretical valu…
Long-period radial velocity variations of nine M red giants. The detection of substellar companions around HD 6860 and HD 112300
Lee, Byeong-Cheol; Do, Hee-Jin; Park, Myeong-Gu +7 more
Context. Certain periodic variations of radial velocities (RVs) of wobbling giants originate from exoplanets. A number of exoplanets have been discovered around giant stars.
Aims: The purpose of our study is to find low-amplitude and long-period RV variations around bright M (super) giants in the red giant branch (or asymptotic giant branch) …
Atmosphere-aware photoclinometry for pixel-wise 3D topographic mapping of Mars
Liu, Wai Chung; Wu, Bo
High-resolution topographic mapping is essential for scientific investigations and operational exploration of planets, such as Mars. Photoclinometry, which uses light scattered from a surface to reconstruct 3D topography, can retrieve subtle topographic details from monocular images. However, its performance is affected by the atmosphere of Mars, …
Digging a little deeper: characterizing three new extreme ULX candidates
Scaringi, S.; Roberts, T. P.; Walton, D. J. +2 more
A prime motivation for compiling catalogues of any celestial X-ray source is to increase our numbers of rare subclasses. In this work, we take a recent multimission catalogue of ultraluminous X-ray sources (ULXs) and look for hitherto poorly-studied ULX candidates that are luminous ($L_{\rm X} \ge 10^{40}\,{\rm erg\,s}^{-1}$), bright ($f_{\rm X} \…
Water Ice Sublimation Distribution on the Surface of Short Period Comet
Li, C.; Zhao, Y. H.; Ji, J. H.
Comets are the primitive planetesimals left in the solar system. Studying the evolution of comet nucleus is of great significance for understanding the formation and evolution history of other celestial bodies in the solar system. Under the action of solar radiation, the volatile components of comets sublimate and drive the dust movement, resultin…
Radio and mid-infrared properties of the blazar J1419–0838
Frey, Sándor; Gabányi, Krisztina Éva; Perger, Krisztina
The radio quasar NVSS J141922‑083830 (J1419‑0838) was initially classified as an uncategorised blazar-type object, following its detection in the
On the origin of the anomalous gas, non-declining rotation curve, and disc asymmetries in NGC 253
Meurer, Gerhardt R.; Lyu, Xuanyi; Westmeier, T. +1 more
We present a multiwavelength (from far-ultraviolet to ${\rm H}\, \rm {\small I}$ emission) study of star formation feedback on the kinematics of the interstellar medium in the Sculptor galaxy, NGC 253. Its three well-known features (a disrupted stellar disc, a previously reported declining rotation curve, and anomalous ${\rm H}\, \rm {\small I}$ g…
Discovery of a magnetar candidate X-ray pulsar in the Large Magellanic Cloud
Haberl, F.; Tiengo, A.; Stella, L. +11 more
During a systematic search for new X-ray pulsators in the XMM-Newton archive, we discovered a high amplitude ($PF\simeq 86~{{\ \rm per\ cent}}$) periodic ($P\simeq 7.25\, \mathrm{s}$) modulation in the X-ray flux of 4XMM J045626.3-694723 (J0456 hereafter), a previously unclassified source in the Large Magellanic Cloud (LMC). The period of the modu…