Search Publications
An Investigation of New Brown Dwarf Spectral Binary Candidates From the Backyard Worlds: Planet 9 Citizen Science Initiative
Meisner, Aaron M.; Kirkpatrick, J. Davy; Burgasser, Adam J. +9 more
We present three new brown dwarf spectral-binary candidates: CWISE J072708.09-360729.2, CWISE J103604.84-514424.4, and CWISE J134446.62-732053.9, discovered by citizen scientists through the Backyard Worlds: Planet 9 project. Follow-up near-infrared spectroscopy shows that each of these objects is poorly fit by a single near-infrared standard. We …
Kinematics of the Galactic Disk Based on Open Cluster Data
Popova, M. E.
We study the dependence of the kinematic properties of the subsystems of Galactic open clusters on their ages. It was found that the angular velocity of Galactic rotation in the solar vicinity decreases to 25.6 km s
Spacecraft Charging Simulations of Probe B1 of Comet Interceptor during the Cometary Flyby
Henri, P.; Miyake, Y.; Johansson, F. L. +2 more
Comet Interceptor will be the first mission to make a flyby of a long-period or interstellar comet. After launch, the spacecraft will wait at the Sun-Earth Lagrange point L2 for a yet-to-be-discovered comet to appear. The mission comprises three spacecraft: One main spacecraft, A, developed by ESA, and two subprobes, B1 and B2, developed by JAXA a…
Relation between photometric and parameter errors of star clusters
Li, Zhongmu; Liu, Xuejie
Many observations supply only photometry data with large uncertainties. The study of star clusters based on such data is important for astrophysical studies, although photometric uncertainty affects the accuracy of results. In order to estimate the parameter uncertainties that are caused by photometric errors, this work quantifies the influence of…
A helium nova in the Large Magellanic Cloud - the faint supersoft X-ray source [HP99]159
Kato, Mariko; Hachisu, Izumi; Saio, Hideyuki
We propose a helium nova model for the Large Magellanic Cloud (LMC) supersoft X-ray source (SSS) [HP99]159. This object has long been detected as a faint and persistent SSS for about 30 yr, and recently been interpreted to be a source of steady helium-shell burning, because no hydrogen lines are observed. We find that the object can also be interp…
Bipolar Nebula AFGL 2688 in the System of Post-AGB Star V1610 Cyg
Klochkova, V. G.; Panchuk, V. E.; Yushkin, M. V.
We present a survey of the results of photometric and spectral observations of a nebula AFGL 2688 in the system of post-AGB star V1610 Cyg. Apart from the analysis of the published results, our new spectral observations of the star at the BTA over 2002–2022 are also given consideration. A new understanding of the kinematics of gas and dust in the …
The Catalog of Resolved Spectroscopic Binaries: Development and Description
Malkov, O. Yu.; Pakhomova, P. V.; Zeleke, D. B. +2 more
Resolved spectroscopic binaries are unique among other types of binaries. They provide the only possibility (aside from trigonometric parallaxes) to accurately determine distances to objects, which is one of the most important characteristics in astronomy. Such binaries are not numerous, but an exhaustive catalog of them still does not exist. The …
A sign in space: An interdisciplinary exploration of the potential reception of an extraterrestrial signal
Ferri, Paolo; de Paulis, Daniela; Shostak, Seth +5 more
A Sign in Space is an interdisciplinary project by media artist Daniela de Paulis, in collaboration with the Green Bank Observatory, the National Institute for Astrophysics, the SETI Institute and the European Space Agency.
The project consists in transmitting a simulated extraterrestrial message as part of a live performance, using an ESA sp…Globular Cluster UVIT Legacy Survey (GlobULeS) - II. Evolutionary status of hot stars in M3 and M13
Pradhan, Ananta C.; Sahu, Snehalata; Subramaniam, Annapurni +4 more
We present a far-ultraviolet (FUV) study of hot stellar populations in the second parameter pair globular clusters (GCs) M3 and M13, as a part of the GC UVIT Legacy Survey programme (GlobULeS). We use observations made with F148W and F169M filters of the Ultraviolet Imaging Telescope (UVIT) onboard AstroSat along with ground-based data (UBVRI filt…
Energization of Cold Protons and Helium Ions by EMIC Waves in the Inner Magnetosphere: Hybrid Simulations
Lee, Ensang; Min, Kyungguk; Kwon, Jong-Woo +3 more
Electromagnetic ion cyclotron (EMIC) waves generated by hot anisotropic (T⊥ > T∥) protons (∼10-100 keV), play an important role in accelerating cold (<1 eV) protons (H+) and helium (He+) ions in the magnetosphere. Using a hybrid code with parameters found in the inner magnetosphere, we examine when…