Search Publications
Reinvestigation of the Multiepoch Direct Detections of HD 88133 b and Upsilon Andromedae b
Barman, Travis S.; Benneke, Björn; Bender, Chad F. +5 more
We reanalyze the multiepoch direct detections of HD 88133 b and ups And b that were published in Piskorz et al. (2016) and Piskorz et al. (2017), respectively. Using simulations to attempt to reproduce the detections, we find that with the six and seven L-band Keck/NIRSPEC epochs analyzed in the original works, the planets would not have been dete…
Using Gaia DR2 to make a systematic comparison between two geometric distortion solutions
Lin, F. R.; Peng, Q. Y.; Zheng, Z. J.
Gaia Data Release 2 (Gaia DR2) provides high accuracy and precision astrometric parameters (position, parallax, and proper motion) for more than 1 billion sources and is revolutionizing astrometry. For a fast-moving target such as an asteroid, with many stars in the field of view that are brighter than the faint limit magnitude of Gaia (21 Gmag), …
Motion of Classic and Spontaneous Hot Flow Anomalies Observed by Cluster
Zhang, Hui; Guo, Ruilong; Zhang, Shuai +12 more
The propagation characteristics of hot flow anomalies (HFAs) near the Earth's bow shock are investigated, using observations from the Cluster spacecraft. A data set comprised of 19 classic HFAs (associated with tangential discontinuities, TDs) and 23 spontaneous HFAs (SHFAs, formed in the absence of solar wind discontinuities) was analyzed. For ea…
Exploring Ceres's Unusual Regolith Porosity and Its Implications for Volatile Retention
Heggy, Essam; Palmer, Elizabeth M.; Letertre, Thibaut +1 more
Asteroid Ceres, the only dwarf planet located in the inner solar system, shows unique surface mineralogy and geomorphology as observed by the Dawn mission. Of particular interest is understanding the role that upper regolith porosity plays in retaining volatiles and shaping Ceres' surface. Unfortunately, Ceres' near-surface porosity remains largel…
The distances of 61 PGCCs in the second galactic quadrant
Huang, Y.; Chen, B. -Q.; Sun, W. -X. +5 more
Determining the distances to the Planck Galactic cold clumps (PGCCs) is crucial for the measurement of their physical parameters and the study of their Galactic distribution. Based on two large catalogues of stars with robust distances and reddening estimates from the literature, we have estimated accurate distances to 61 PGCCs in the second Galac…
Investigating the true nature of three hard X-ray sources
Palazzi, E.; Masetti, N.; Bird, A. J. +6 more
Many of the new high energy sources discovered both by INTEGRAL/IBIS and Swift/BAT have been characterized thanks to extensive, multiband follow-up campaigns, but there are still objects whose nature remains to be asserted. In this paper, we investigate the true nature of three high energy sources, IGR J12134-6015, IGR J16058-7253, and Swift J2037…
A photometric study of two neglected eclipsing binaries
Fedurco, M.; Parimucha, Š.; Kudak, V. +1 more
We present the first BVR photometry, period variation and photometric light curve analysis of two poorly studied eclipsing binaries, V1321 Cyg and CR Tau. Observations were carried out from November 2017 to January 2020 at the observatory of Uzhhorod National University. Period variations were studied using all available early published as well as…
Search for variable stars in the open cluster NGC 1245
Zhang, Yu; Liu, Jin-Zhong; Zeng, Xiang-Yun +5 more
We used the Nanshan 1m telescope of Xinjiang Astronomical Observatory to investigate variable stars in the region of NGC 1245. We detected 55 variable stars in the field of view, 42 of them are newly discovered: six binaries, 22 pulsating stars, 14 unclassified variables. We discussed the physical properties and classifications of the variable sta…
Simulating Photometric Images of Moving Targets with Photon-mapping
Chen, Xu; Hu, Shaoming; Du, Junju +2 more
We present a novel, easy-to-use method based on the photon-mapping technique to simulate photometric images of moving targets. Realistic images can be created in two passes: photon tracing and image rendering. The nature of light sources, tracking mode of the telescope, point-spread function, and specifications of the CCD are taken into account in…
Analysis of Previously Classified White Dwarf-Main-sequence Binaries Using Data from the APOGEE Survey
Cunha, Katia; Majewski, Steven R.; Stassun, Keivan G. +12 more
We present analyses of near-infrared spectroscopic data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey for 45 previously confirmed or candidate white dwarf-main-sequence (WDMS) binaries identified by the optical Sloan Digital Sky Survey (SDSS) and LAMOST surveys. Among these 45 systems, we classify three as having …