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Sublimation of volatiles from H2O:CO2 bulk ices in the context of comet 67P/Churyumov-Gerasimenko. I. N2 and CO
Wurz, P.; Altwegg, K.; Rubin, M. +6 more
Context. Comets are considered to be remnants from the formation of the Solar System. ESA's Rosetta mission targeted comet 67P/Churyumov-Gerasimenko and was able to record high-quality data on its chemical composition and outgassing behaviour, including low abundances of N2 that are observed to be correlated with H2O and CO
The impact of periastron passage on the X-ray and optical properties of the Symbiotic System R Aquarii
Guerrero, M. A.; Toalá, J. A.; Karovska, M. +4 more
Multi-epoch Chandra and XMM-Newton observations of the symbiotic system R Aquarii (R Aqr) spanning 22 yr are analysed by means of a reflection model produced by an accretion disc. This methodology helps dissecting the contribution from different components in the X-ray spectra of R Aqr: the soft emission from the jet and extended emission, the hea…
Simultaneous Photometric and Spectroscopic Analysis of V505 Lacertae, a Photospherically and Chromospherically Active Contact Binary Star
Han, Cheongho; Hong, Kyeongsoo; Kim, Chun-Hwey +4 more
New BVR photometric and high-resolution spectroscopic observations of V505 Lac are presented with Transiting Exoplanet Survey Satellite (TESS) photometric data. The orbital period has experienced a secular decrease during the past 16 yr. A clear anticorrelation in the primary and secondary eclipse timing variation (PSETV) obtained from the TESS da…
Characterization of Monosubstituted Benzene Ices
Öberg, Karin I.; Piacentino, Elettra L.; Balkanski, Aurelia +1 more
Aromatic structures are fundamental for key biological molecules such as RNA and metabolites and the abundances of aromatic molecules on young planets are therefore of high interest. Recent detections of benzonitrile and other aromatic compounds in interstellar clouds and comets have revealed a rich aromatic astrochemistry. In the cold phases of s…
Nonthermal Observations of a Flare Loop-top Using IRIS Fe XXI: Implications for Turbulence and Electron Acceleration
Polito, Vanessa; Yu, Sijie; Hayes, Laura A. +2 more
The excess broadening of high-temperature spectral lines, long observed near the tops of flare arcades, is widely considered to result from magnetohydrodynamic turbulence. According to different theories, plasma turbulence is also believed to be a candidate mechanism for particle acceleration during solar flares. However, the degree to which this …
Effect of temperature on measurement of fundamental constants using white dwarfs in Gaia-EDR3 survey
Uniyal, Akhil; Kalita, Surajit; Chakrabarti, Sayan
Fundamental constants are crucial for comprehending physical mechanisms, but their measurements contain uncertainties due to experimental limitations. We investigate the impact of system temperature on these uncertainties using nearby white dwarfs observed in the Gaia Early Data Release 3 (EDR3) survey. Using the structures of these white dwarfs, …
X-ray detection of the most extreme star-forming galaxies at the cosmic noon via strong lensing
Frye, Brenda L.; Yun, Min S.; Liu, Daizhong +11 more
Hyperluminous infrared galaxies (HyLIRGs) are the most extreme star-forming systems observed in the early Universe, and their properties still elude comprehensive understanding. We have undertaken a large XMM-Newton observing programme to probe the total accreting black hole population in three HyLIRGs at z = 2.12, 3.25, and 3.55, gravitationally …
Particle acceleration at the bow shock of runaway star LS 2355: non-thermal radio emission but no γ-ray counterpart
Motta, S.; van den Eijnden, J.; Mohamed, S. +3 more
Massive stars that travel at supersonic speeds can create bow shocks as their stellar winds interact with the surrounding interstellar medium (ISM). These bow shocks - prominent sites for mechanical feedback of individual massive stars - are predominantly observed in the infrared (IR) band. Confirmed high-energy emission from stellar bow shocks ha…
Unraveling the kinematics of IZw18: A detailed study of ionized gas with MEGARA/GTC
Kehrig, C.; Pérez-Montero, E.; Vílchez, J. M. +6 more
This study offers an in-depth analysis of the kinematic behavior of ionized gas in IZw18, a galaxy notable for its extremely low metallicity and close proximity, utilizing data from MEGARA/GTC. We explored the structure and dynamics of the galaxy through Hα line profiles, applying single and double Gaussian component fittings to create detailed ma…
Observations of Nonthermal Velocities and Comparisons with an Alfvén Wave Turbulence Model in Solar Active Regions
Hahn, M.; Savin, D. W.; Brooks, D. H. +3 more
We present a study of spectral line width measurements from the Extreme-ultraviolet Imaging Spectrometer on Hinode. We used spectral line profiles of Fe XVI 262.984 Å, Fe XIV 264.787 Å, Fe XIV 270.519 Å, Fe XIV 274.203 Å, and Fe XV 284.160 Å, and studied 11 active regions. Previous studies of spectral line widths have shown that in hot loops in th…