Search Publications
Cassini Radio Occultation Observations of Saturn's Ionosphere: Electron Density Profiles From 2005 to 2013
Withers, Paul; Dalba, P. A.; Moore, L. +2 more
A set of electron density profiles of Saturn's ionosphere acquired by Cassini radio occultations is archived at the NASA Planetary Data System. However, the reference surface that defines zero altitude in these profiles is unknown and appears to vary by 1,500 km at fixed latitude. These profiles are immensely valuable for addressing questions pert…
Supersoft luminous X-ray sources in galactic nuclei
Miniutti, G.; Risaliti, G.; Sacchi, A.
Context. Tidal disruption events (TDEs) are usually discovered at X-ray or optical wavelengths through their transient nature. A characteristic spectral feature of X-ray detected TDEs is a `supersoft' X-ray emission, not observed in any other extragalactic source, with the exception of a few rapidly variable hyperluminous X-ray sources (HLXs) or s…
Atmospheric and Fundamental Parameters of the Individual Components of Multiple Stellar Systems
Al-Wardat, Mashhoor A.; Abu-Alrob, Enas M.; Hussein, Abdallah M.
We present detailed analyses of eight triple stellar systems (lying between 20 and 155 pc) and nine quadruple stellar systems (lying between 20 and 250 pc) with different configurations. Most of these systems are hierarchical. The systems are HIP 4239, HIP 5588, HIP 11072, HIP 12548, HIP 13498, HIP 17895, HIP 19915, HIP 22607, HIP 25240, HIP 28614…
MUSE-ALMA Haloes - IX. Morphologies and stellar properties of gas-rich galaxies
Hayes, Matthew; Kacprzak, Glenn G.; Kulkarni, Varsha P. +15 more
Understanding how galaxies interact with the circumgalactic medium (CGM) requires determining how galaxies' morphological and stellar properties correlate with their CGM properties. We report an analysis of 66 well-imaged galaxies detected in Hubble Space Telescope and Very Large Telescope MUSE observations and determined to be within ±500 km s
Testing protoplanetary disc evolution with CO fluxes. A proof of concept in Lupus and Upper Sco
Facchini, Stefano; Manara, Carlo F.; Zagaria, Francesco +3 more
The Atacama Large Millimeter/submillimeter Array (ALMA) revolutionised our understanding of protoplanetary discs. However, the available data have not given conclusive answers yet on the underlying disc evolution mechanisms: viscosity or magnetohydrodynamic (MHD) winds. Improving upon the current results, mostly based on the analysis of disc sizes…
Forecasting Heliospheric CME Solar-Wind Parameters Using the UCSD Time-Dependent Tomography and ISEE Interplanetary Scintillation Data: The 10 March 2022 CME
Saito, Yoshifumi; Yokota, Shoichiro; Barthe, Alain +15 more
Remotely sensed interplanetary scintillation (IPS) data from the Institute for Space-Earth Environmental Research (ISEE), Japan, allows a determination of solar-wind parameters throughout the inner heliosphere. We show the 3D analysis technique developed for these data sets that forecast plasma velocity, density, and component magnetic fields at E…
Are Quasi-periodic Pulsations Independent of Loop Oscillations in Solar Flare?
Li, Dong; Feng, Song; Ning, Zongjun +3 more
We investigated oscillations in an M8.7 solar flare (SOL2014-10-22), including quasi-periodic pulsations (QPPs) in light curves and Doppler shift oscillations in the flare loops. Using Bayesian-based Markov Chain Monte Carlo, Fast Fourier Transform, and wavelet analysis method, QPPs were identified at microwave and hard X-ray wave bands during the…
Broadband X-Ray Spectral Analysis of the ULX NGC 1313 X-1 Using JeTCAF: Origin of the ULX Bubble
Mondal, Santanu; Palit, Biswaraj
NGC 1313 X-1 is a mysterious ultraluminous X-ray (ULX) source whose X-ray-powering mechanism and bubble-like structure surrounding the source are topics of intense study. Here, we perform an X-ray spectroscopic study of the source using joint XMM-Newton and NuSTAR observations taken during 2012-2017. The combined spectra cover the energy band 0.3-…
Converting the sub-Jovian desert of exoplanets to a savanna with TESS, PLATO, and Ariel
Pál, András; Bódi, Attila; Szabó, Róbert +3 more
There is a lack of exoplanets with sizes similar to Neptune orbiting their host stars with periods ≲3 d - hence the name 'sub-Jovian/Neptune desert'. Recently, several exoplanets have been confirmed to reside in the desert, transforming it into a 'savanna' with several 'giraffe' planets (such as LTT 9779 b and TOI-674 b). The most prominent scenar…
The Hubble PanCET program: The near-ultraviolet transmission spectrum of WASP-79b
Lecavelier des Etangs, A.; Bourrier, V.; Sing, D. K. +11 more
We present Hubble Space Telescope (HST) transit observations of the Hot-Jupiter WASP-79 b acquired with the Space Telescope Imaging Spectrograph (STIS) in the near ultraviolet (NUV). Two transit observations, part of the PanCET program, are used to obtain the transmission spectra of the planet between 2280 and 3070 Å. We correct for systematic eff…