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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…
Comprehensive study of the Galactic Planetary Nebula NGC 2792
Ali, A.; Snaid, S.; Alruhaili, A.
This paper describes integral field unit (IFU) spectroscopic observations of the Galactic planetary nebula (PN) NGC 2792. The physical conditions, chemical composition, and kinematic properties are discussed and found to be in good agreement with prior long-slit-based investigations. The intensity of the He II line indicates that the nebula is of …
First Detailed Analysis of a Relatively Deep, Low Mass-ratio Contact Binary: ATO J108.6991+27.8306
Zhang, Yu; Ma, Shuo; Liu, Jinzhong +3 more
We present the first detailed photometric analysis of ATO J108.6991+27.8306 (hereinafter as J108). The short-period close binary J108 was observed by the Nanshan 1 m Wide Field Telescope of the Xinjiang Astronomical Observatory. The obtained BVRI-band light curves were used to determine the photometric solution by using the 2003 version of the Wil…
Supernova Remnants in the Irregular Galaxy NGC 4449
Blair, William P.; Long, Knox S.; Winkler, P. Frank
The nearby irregular galaxy NGC 4449 has a star formation rate of ~0.4M ☉ yr-1 and should host of order 70 supernova remnants (SNRs) younger than 20,000 yr, a typical age for SNRs expanding into an interstellar medium (ISM) with a density of 1 cm-3 to reach the radiative phase. We have carried out an optical imagin…