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Identifying objects of the optical range in the regions of hard radiation near red dwarf stars
Shlyapnikov, Aleksey
We analyze the localization regions of TeV gamma-ray sources in the X-ray and optical spectral ranges. The angle distances from the position of maxima in the distribution of high-energy fluxes to the probable candidates for identification with red dwarfs are indicated. Possible identifications of fainter TeV sources and other field objects are als…
Probing Velocity Dispersion Inside Coronal Mass Ejections: New Insights on Their Initiation
Mierla, Marilena; Reiss, Martin A.; Banerjee, Dipankar +4 more
This work studies the kinematics of the leading edge and the core of six coronal mass ejections (CMEs) in the combined field of view of Sun Watcher using Active Pixel System detector and Image Processing (SWAP) on board PRoject for On-Board Autonomy (PROBA-2) and the ground-based K-Cor coronagraph of the Mauna Loa Solar Observatory. We report, for…
Using synthetic disk-integrated reflectance spectra to constrain direct imaging sensitivity requirements for a Mars-like exoplanet
Wolfe, C. A.; Robinson, T. D.
The 2020 Decadal Survey on Astronomy and Astrophysics 11https://doi.org/10.17226/26141. recommended the prioritization of a space-based telescope capable of directly characterizing Earth-like exoplanets in reflected light. The planned suite of instruments onboard such a mission are expected to provide disk-integrated spectra with modera…
Star formation in the high-extinction Planck cold clump PGCC G120.69+2.66
Djupvik, Anlaug A.; Comerón, Fernando; Yun, João L.
We investigate the star formation occurring in the Planck Galactic cold clump PGCC 120.69+2.66. Near-infrared JHKs images and K-band spectroscopy obtained with NOTCam at the Nordic Optical Telescope complemented with archive data are used to study the stellar content. In addition, millimetre line CO and CS spectra were obtained with the Onsala 20 …
Validation of the RR Lyrae period determination in the Pan-STARRS PS1 3π survey with K2
Szabó, Róbert; Molnár, László; Forró, Adrienn +2 more
Context. The Pan-STARRS 3π survey has detected hundreds of thousands of variable stars thanks to its coverage and 4-year time span, even though the sampling of the light curves is relatively sparse. These light curves contain only 10–15 detections in each of the five filters (g, r, i, z, y). During the K2 mission, the Kepler space telescope observ…
Radial Distribution of Electron Quasi-thermal Noise in the Inner Heliosphere
Chen, Ling; Li, Yi-Lun; Wu, De-Jin
The electron population in the solar wind plasma can be described with three different components: a core, a halo, and a magnetic field aligned strahl. The electron quasi-thermal noise (QTN) is investigated by using an electron population model consisting of a core with a Maxwellian distribution and a halo with a kappa distribution, based on the e…
Soft X-Ray Energy Spectra in the Wide-field Galactic Disk Area Revealed with HaloSat
Kaaret, Philip; Angelini, Lorella; Mitsuishi, Ikuyuki +3 more
We analyzed data from HaloSat observations for five fields in the Galactic disk located far away from the Galactic center (135° < l < 254°) to understand the nature of soft X-ray energy emission in the Galactic disk. The fields have 14° diameter and were selected to contain no significant high-flux X-ray sources. All five HaloSat soft X-ray …
A Radio-loud Semiregular Variable
Luque-Escamilla, Pedro L.; Martí, Josep
As a byproduct of our search for Galactic stellar systems with gamma-ray emission, we have identified an unrelated cool and evolved star (IRC-10412) that attracted our attention due to its strong radio emission level with a spectral index matching, almost perfectly, the canonical +0.6 value expected from an ionized stellar wind. A follow-up observ…
Suprathermal Outflowing H+ Ions in the Lobe Driven by an Interplanetary Shock: 2. A 3D Global Hybrid Simulation
Mouikis, C. G.; Wang, Chih-Ping; Wang, Xueyi +2 more
We conduct a global hybrid simulation of an observation event to affirm that an interplanetary (IP) shock can drive significant suprathermal (tens to hundreds of eV) H+ outflows from the polar cap. The event showed that a spacecraft in the lobe at ∼6.5 RE altitude above the polar cap observed the appearance of suprathermal ou…
Study of hydrated asteroids via their polarimetric properties at low phase angles
Hasegawa, Sunao; Watanabe, Makoto; Ishiguro, Masateru +11 more
Context. Ch-type asteroids are distinctive among other dark asteroids in that they exhibit deep negative polarization branches (NPBs). Nevertheless, the physical and compositional properties that cause their polarimetric distinctiveness are less investigated. Aims. We aim to investigate the polarimetric uniqueness of Ch-type asteroids by making da…