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Analysis of Emission Line Widths of [CII] 158µm
Samsonyan, A. L.
A study of [CII] 158 µm emission line profiles observed with Herschel PACS for 379 galaxies is presented. Emission line widths are compared to [CII] luminosities, to near-infrared 1.6 µm luminosities and to infrared 22 µm luminosities to decide if any luminosity relates to velocity dispersion. Archival data for [CII] fluxes and l…
When Do Stars Go Boom?
Cohen, Roger E.; Sabbi, Elena; Caiazzo, Ilaria +10 more
The maximum mass of a star that can produce a white dwarf (WD) is an important astrophysical quantity. One of the best approaches to establishing this limit is to search for WDs in young star clusters in which only massive stars have had time to evolve and where the mass of the progenitor can be established from the cooling time of the WD together…
A trio of giant planets orbiting evolved star HD 184010
Izumiura, Hideyuki; Sato, Bun'ei; Yoshida, Michitoshi +11 more
We report the discovery of a triple-giant-planet system around an evolved star HD 184010 (HR 7421, HIP 96016). This discovery is based on observations from Okayama Planet Search Program, a precise radial velocity survey, undertaken at Okayama Astrophysical Observatory between 2004 April and 2021 June. The star is K0 type and located at the beginni…
On the potential variation of charged dust in Saturn's magnetosphere: The dust-plasma interaction
Rehman, Umer; Hussain, Ibrar; Qammar, Ambreen
We presented a theory describing interaction between cold plasma and dust grain based on Cassini observations of Enceladus in Saturn's E ring. We assumed a finite-sized dust cloud with inside plasma to simulate the environment. The dust cloud that results from this scenario has a different potential than the surrounding plasma. Cassini's observati…
An astrometric mass estimate for asteroid (223) Rosa
Kretlow, M.
Context. Outer main belt asteroid (223) Rosa is a possible flyby target of opportunity for the European Space Agency (ESA) JUpiter ICy moons Explorer (JUICE) mission when it passes the asteroid belt on the way to Jupiter. The very low albedo and the featureless red spectra indicate a P-type asteroid in the Tholen taxonomy, though the yet known bul…
HST STIS Observations of ζ Aurigae A's Irradiated Atmosphere
Ayres, Thomas R.; Harper, Graham M.; Bennett, Philip D. +3 more
The details of the processes responsible for heating the chromospheres of evolved cool stars remain uncertain. While most spectroscopic diagnostics measure spatially-integrated emission, here we examine diagnostics sensitive to localized atmospheric regions that are specific to cool evolved stars in binary systems with hot main-sequence companions…
Machine learning for effective spacecraft operation: Operating INTEGRAL through dynamic radiation environments
Finn, Timothy; Southworth, Richard; Donati, Alessandro +8 more
INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory) is an astronomical observatory of the European Space Agency, responsible for many significant scientific discoveries in the last few decades. It orbits Earth since 2002 in a highly elliptical orbit, passing through the Van Allen belts - areas with high-energy ionized particles that can dam…
Imaging and Spectroscopic Observations of the Dynamic Processes in Limb Solar Flares
Ding, M. D.; Li, Y.; Song, De-Chao +2 more
We investigate various dynamic processes including magnetic reconnection, chromospheric evaporation, and coronal rain draining in two limb solar flares through imaging and spectroscopic observations from the Interface Region Imaging Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. In the early…
Global Extinction: Gemini North and South GMOS Combined Photometry Relative to the Gaia Catalog, and Long-term Atmospheric Change
Steinbring, Eric
Effects of long-term atmospheric change were looked for in photometry employing Gemini North and South twin Multi-Object Spectrograph (GMOS-N and GMOS-S) archival data. The whole GMOS imaging database, beginning from 2003, was compared against the all-sky Gaia object catalog, yielding ~106 Sloan $r^{\prime} $ -filter samples, ending in …
Parameters of the eclipsing binary α Draconis observed by TESS and SONG
Kochukhov, Oleg; Bedding, Timothy R.; Murphy, Simon J. +9 more
We present an analysis of the eclipsing single-lined spectroscopic binary system α Dra based on photometry from the Transiting Exoplanet Survey Satellite (TESS) mission and newly acquired spectroscopic measurements. Recently discovered to have eclipses in the TESS data, at a magnitude of V = 3.7, α Dra is now one of the brightest detached eclipsin…