Search Publications
VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express
Zhang, Peijin; Xiong, Ming; Xia, Bo +13 more
The ESA's Mars Express solar corona experiments were performed at two solar conjunctions in the years 2015 and 2017 by a number of radio telescopes in the European VLBI Network. This paper presents the methods to measure the frequency and phase fluctuations of the spacecraft radio signal, and the applications to study the characteristics of the pl…
OGLE-2019-BLG-0304: Competing Interpretations between a Planet-binary Model and a Binary-source + Binary-lens Model
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +32 more
We analyze the microlensing event OGLE-2019-BLG-0304, whose light curve exhibits two distinctive features: a deviation in the peak region and a second bump appearing ~61 days after the main peak. Although a binary-lens model can explain the overall features, it leaves subtle but noticeable residuals in the peak region. We find that the residuals c…
The Investigation of Seven Kepler Contact Binaries in the Field of NGC 6819
Liu, L.; Li, X. -Z.
Using the Kepler Eclipsing Binary Catalog, we found seven EW-type eclipsing binaries within the tidal radius of the intermediate-aged open cluster NGC 6819 (about 40'). These seven EW eclipsing binaries are all confirmed to be contact binaries by light curve analysis with the 2015 version Wilson-Devinney program. Using the parameter characteristic…
A Study about the Secular Evolution of the Hierarchical Three-body Problem Using the Numerical Integrator TIDES
Docobo, José A.; Campo, Pedro P.; Piccotti, Luca +1 more
The hierarchical three-body problem is one of the classical issues of celestial mechanics, but recently it has regained importance due to its applications to new scenarios, like compact objects and exoplanets. In this paper we realize a computational study of this problem using the TIDES software package, which is applied not only to a set of theo…
Preview of Comet C/2021 A1 (Leonard) and Its Encounter with Venus
Zhang, Qicheng; Farnham, Tony L.; Knight, Matthew M. +2 more
Long-period comet C/2021 A1 (Leonard) will approach Venus to within 0.029 au on 2021 December 18 and may subsequently graze the planet with its dust trail less than 2 days later. We observed C/2021 A1 with the Lowell Discovery Telescope on 2021 January 13 and March 3, as well as with the Palomar Hale Telescope on 2021 March 20, while the comet was…
HAT-P-68b: A Transiting Hot Jupiter around a K5 Dwarf Star
Torres, Guillermo; Bieryla, Allyson; Latham, David W. +23 more
We report the discovery by the ground-based Hungarian-made Automated Telescope Network (HATNet) survey of the transiting exoplanet HAT-P-68b, which has a mass of 0.724 ± 0.043 MJ, and radius of 1.072 ± 0.012 RJ. The planet is in a circular P = 2.2984 day orbit around a moderately bright V = 13.937 ± 0.030 magnitude K-dwarf st…
Ground Vibrational State SiO Emission in the VLA BAaDE Survey
Rich, R. M.; Morris, M. R.; Claussen, M. J. +5 more
Using a subsample of the Bulge Asymmetries and Dynamical Evolution (BAaDE) survey of stellar SiO masers, we explore the prevalence and characteristics of 28SiO J = 1 - 0, v = 0 emission. We identify 90 detections of maser, thermal, or composite 28SiO J = 1 - 0, v = 0 emission out of approximately 13,000 candidate spectra from…
A Gaia-based Photometric and Kinematic Analysis of the Old Open Cluster King 11
Bisht, D.; Yadav, R. K. S.; Vereshchagin, S. V. +5 more
This paper presents an investigation of an old age open cluster King 11 using Gaia's Early Data Release 3 data. Considering the stars with membership probability (Pµ) > 90%, we identified 676 most probable cluster members within the cluster's limiting radius. The mean proper motion for King 11 is determined as: µx
Spectroscopic Observations of Obscured Populations in the Inner Galaxy: 2MASS-GC02, Terzan 4, and the 200 km s-1 stellar peak
Kunder, Andrea; Debattista, Victor P.; Koch-Hansen, Andreas J. +2 more
The interpretation of potentially new and already known stellar structures located at low latitudes is hindered by the presence of dense gas and dust, as observations toward these sight lines are limited. We have identified Apache Point Observatory Galaxy Evolution Experiment (APOGEE) stars belonging to the low-latitude globular clusters 2MASS-GC0…
Analysis of Hybrid Gas-Dust Outbursts Observed at 67P/Churyumov-Gerasimenko
Parker, Joel Wm.; Bertaux, Jean-Loup; Stern, S. Alan +14 more
Cometary outbursts offer a valuable window into the composition of comet nuclei with their forceful ejection of dust and volatiles in explosive events, revealing the interior components of the comet. Understanding how different types of outbursts influence the dust properties and volatile abundances, to better interpret what signatures can be attr…