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Characterization of the eclipsing post-common-envelope binary TIC 60040774
Knigge, C.; Scaringi, S.; Buckley, D. A. H. +2 more
Binaries with a white dwarf primary and a main sequence secondary can be used to test our understanding of both single and binary star evolution. A small fraction of such systems experienced a common-envelope phase from which they emerged with a relatively short orbital period. Here, we present the characterization of an eclipsing post-common-enve…
New Photometric and Spectroscopic Observations of the Eclipsing Binary V2080 Cygni
Schwarzenberg-Czerny, A.; Kamiński, K.; Dimitrov, W. +7 more
We present new spectroscopic and photometric measurements of the eclipsing binary V2080 Cyg. It is a detached system with similar components and an orbital period of 4.9 d. We collected spectroscopic data with two instruments, 1.88 m DDO telescope equipped with Cassegrain spectrograph and 0.5 m PST1 connected to a fiber-fed echell\'e spectrograph.…
Navigation and Orbit Estimation for New Horizons' Arrokoth Flyby: Overview, Results and Lessons Learned
Weaver, Harold A.; Kavelaars, J. J.; Gwyn, Stephen D. J. +18 more
The New Horizons mission performed a successful flyby of Arrokoth, a distant Kuiper-Belt Object, on January 1, 2019, representing the farthest planetary encounter to date. The navigation strategy and performance required to deliver the spacecraft to the desired flyby target were driven by a number of challenges including those related to Arrokoth'…
Search for gamma-ray emission from a galactic supernova with the anticoincidence system of SPI
Jean, P.; Isern, J.; Bravo, E. +1 more
The detection of the very early gamma-emission of a Type Ia supernova (SNIa) could provide a deep insight on the explosion mechanism and nature of the progenitor. However, this has not been yet possible as a consequence of the expected low luminosity and the distance at which all the events have occurred up to now. An SNIa occurring in our Galaxy …
Galactic component mapping of galaxy UGC 2885 by machine learning classification
Holwerda, Benne W.; Barmby, Pauline; Kwik, Robin J. +1 more
Automating classification of galaxy components is important for understanding the formation and evolution of galaxies. Traditionally, only the larger galaxy structures such as the spiral arms, bulge, and disc are classified. Here we use machine learning (ML) pixel-by-pixel classification to automatically classify all galaxy components within digit…
Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop
Letchford, Roderick R.; White, Graeme L.; Brown, Carolyn J.
The relative Rectilinear motion of optical double stars provides an important clue to the relationship of the components. We provide an objective method of confirming the optical status of double stars, and of obtaining unbiased rectilinear elements solely on data obtained from the HIPPARCOS and Gaia DR2 space missions. We apply this technique to …
The OmegaWhite survey for short-period variable stars - VI. Open clusters
Groot, P. J.; Ramsay, G.; Jeffery, C. S. +3 more
Using light curves with ~3 min cadence and a duration of 2 h made using the OmegaWhite survey, we present the results of a search for short-period variable stars in the field of 20 open clusters. We identified 92 variable stars in these fields. Using a range of cluster member catalogues and Gaia EDR3 data, we have determined that 10 are cluster me…
Quasars' physical properties study based on the medium-band photometric survey
Kotov, Sergey; Dodonov, Sergey; Grokhovskaya, Aleksandra
The study is about the quasars' cosmological evolution. We used the medium-band photometric survey at the 1-m Schmidt telescope of the Byurakan Astrophysical Observatory. The HS47-22 field with an area of 2.38 square degrees has been selected. We have classified objects and composed a sample of quasars using broadband photometric data and morpholo…
Kinematics and interplanetary characteristics of a halo Coronal Mass Ejection: a multi-wavelength analysis
Ebenezer, E.; Soni, Shirsh Lata
In this paper, we present the evolution and speed expansion of a shock driven by a Coronal Mass Ejection (CME) that triggered a type II radio. We combine radio analysis with a broad range of observations taken by other ground-based and space borne observatories to track the evolution of this CME/shock from Sun to 1 AU. The Halo CME studied here oc…
Dippers from TESS Full-frame Images. II. Spectroscopic Characterization of Four Young Dippers
Takita, Satoshi; Hattori, Kohei; Muto, Takayuki +9 more
Photometric monitoring by the Transiting Exoplanet Survey Satellite (TESS) has discovered not only periodic signals by transiting exoplanets but also episodic or quasiperiodic dimming around young stellar objects. The dimming mechanisms of these objects, the so-called "dippers," are thought to be related to either the accretion property or the str…