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Dippers from the TESS Full-frame Images. I. Results of the First One Year Data and Discovery of a Runaway Dipper
Takita, Satoshi; Hattori, Kohei; Muto, Takayuki +9 more
We present a comprehensive catalog of the dippers—young stellar objects that exhibit episodic dimming—derived from one year's worth of data of the Transiting Exoplanet Survey Satellite (TESS) full-frame images. In the survey, we found 35 dippers using the convolutional neural network, most of them newly discovered. Although these dippers are widel…
VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multiwavelength Study
Fortin, P.; Archer, A.; Benbow, W. +67 more
The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2017 February and 2019 May. These deep observations resulted in the discovery of very high energy (VHE; E > 100 GeV) γ-ray emission from this active galaxy. An analysis of ∼57 h…
Photometric and kinematic study of the three intermediate age open clusters NGC 381, NGC 2360, and Berkeley 68
Joshi, Y. C.; Maurya, Jayanand
We present UBVRcIc photometric study of three intermediate age open star clusters NGC 381, NGC 2360, and Berkeley 68 (Be 68). We examine the cluster membership of stars using recently released Gaia DR2 proper motions and obtain a total of 116, 332, and 264 member stars in these three clusters. The mean reddening of E(B - V) =…
Multiwavelength Polarimetry of the Filamentary Cloud IC 5146. II. Magnetic Field Structures
Wang, Jia-Wei; Lai, Shih-Ping; Eswaraiah, Chakali +4 more
The IC 5146 cloud is a nearby star-forming region in Cygnus, consisting of molecular gas filaments in a variety of evolutionary stages. We used optical and near-infrared polarization data toward the IC 5146 cloud, reported in the first paper of this series, to reveal the magnetic fields in this cloud. Using the newly released Gaia data, we found t…
Expectations on mass determination using astrometric microlensing by Gaia
Bastian, U.; Wambsganss, J.; Klüter, J.
Context. Astrometric gravitational microlensing can be used to determine the mass of a single star (the lens) with an accuracy of a few percent. To do so, precise measurements of the angular separations between lens and background star with an accuracy below 1 milli - arcsec at different epochs are needed. Therefore only the most accurate instrume…
Is the gap in the DS Tau disc hiding a planet?
Herczeg, Gregory J.; Long, Feng; Pinte, Christophe +6 more
Recent millimetre-wavelength surveys performed with the Atacama Large Millimeter Array (ALMA) have revealed protoplanetary discs characterized by rings and gaps. A possible explanation for the origin of such rings is the tidal interaction with an unseen planetary companion. The protoplanetary disc around DS Tau shows a wide gap in the ALMA observa…
Mawrth Vallis, Mars: A Fascinating Place for Future In Situ Exploration
Horgan, Briony; Poulet, François; Carter, John +4 more
After the successful landing of the Mars Science Laboratory rover, both NASA and ESA initiated a selection process for potential landing sites for the Mars2020 and ExoMars missions, respectively. Two ellipses located in the Mawrth Vallis region were proposed and evaluated during a series of meetings (three for Mars2020 mission and five for ExoMars…
A Ringed Pole-on Outflow from DO Tauri Revealed by ALMA
Zapata, Luis A.; Rodríguez, Luis F.; Guzmán, Andrés E. +3 more
We present new Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations including the CO(2-1) line and 1.3 mm continuum emission from the surroundings of the young stellar object DO Tauri. The ALMA CO molecular data show three different series of rings at different radial velocities. These rings have radii around 220 and 800 au. We …
Interaction of electron acoustic waves in the presence of superthermal electrons in terrestrial magnetosphere
Masood, W.; Jahangir, R.
We have investigated the propagation and interaction of nonlinear electron acoustic waves (EAWs) in a plasma comprising hot (superthermal) and cold electrons and immobile ions. We have derived the Korteweg-de Vries equation for EAWs in the small amplitude limit. Employing the Hirota's Direct method, we have investigated the multisoliton solutions …
Cometary Comae-Surface Links
Skorov, Yuri; Kappel, David; Vincent, Jean-Baptiste +9 more
A comet is a highly dynamic object, undergoing a permanent state of change. These changes have to be carefully classified and considered according to their intrinsic temporal and spatial scales. The Rosetta mission has, through its contiguous in-situ and remote sensing coverage of comet 67P/Churyumov-Gerasimenko (hereafter 67P) over the time span …