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From the stellar properties of HD 219134 to the internal compositions of its transiting exoplanets
Poretti, E.; Lebreton, Y.; Borsa, F. +8 more
Context. The harvest of exoplanet discoveries has opened the area of exoplanet characterisation. But this cannot be achieved without a careful analysis of the host star parameters.
Aims: The system of HD 219134 hosts two transiting exoplanets and at least two additional non-transiting exoplanets. We revisit the properties of this system using…
KELT-23Ab: A Hot Jupiter Transiting a Near-solar Twin Close to the TESS and JWST Continuous Viewing Zones
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +55 more
We announce the discovery of KELT-23Ab, a hot Jupiter transiting the relatively bright (V = 10.3) star BD+66 911 (TYC 4187-996-1), and characterize the system using follow-up photometry and spectroscopy. A global fit to the system yields host-star properties of {T}eff} =5900+/- 49 K, {M}* ={0.945}-0.054+0.060<…
Molecular Gas Properties in the Host Galaxy of GRB 080207
Hashimoto, Tetsuya; Tamura, Yoichi; Kohno, Kotaro +5 more
We present the results of CO(1-0) and CO(4-3) observations of the host galaxy of a long-duration gamma-ray burst GRB 080207 at z = 2.0858 by using the Karl G. Jansky Very Large Array and the Atacama Large Millimeter/submillimeter Array. The host is detected in CO(1-0) and CO(4-3), becoming the first case for a gamma-ray burst (GRB) host with more …
Suzaku detection of enigmatic geocoronal solar wind charge exchange event associated with coronal mass ejection
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ishikawa, Kumi +5 more
Suzaku detected an enhancement of the soft X-ray background associated with solar eruptions on 2013 April 14-15. The solar eruptions were accompanied by an M6.5 solar flare and a coronal mass ejection with magnetic flux ropes. The enhanced soft X-ray background showed a slight variation over half a day and then a clear one in a few hours. The form…
A broadband spectral analysis of 4U 1702-429 using XMM-Newton and BeppoSAX data
Santangelo, A.; Sanna, A.; Segreto, A. +8 more
Context. Most of the X-ray binary systems containing neutron stars classified as Atoll sources show two different spectral states, referred to as soft and hard. Moreover, a large number of these systems show a reflection component relativistically smeared in their spectra, which provides information on the innermost region of the system.
Aims…
Plasma injection into a solar coronal loop
Peter, H.; Li, L. P.
Context. The details of the spectral profiles of extreme UV emission lines from solar active regions contain key information for investigating the structure, dynamics, and energetics of the solar upper atmosphere.
Aims: We characterize the line profiles not only through the Doppler shift and intensity of the bulk part of the profile. More imp…
Proton Temperature Anisotropies in the Plasma Environment of Venus
Futaana, Y.; Zhang, T. L.; Nilsson, H. +5 more
Velocity distribution functions (VDFs) are a key to understanding the interplay between particles and waves in a plasma. Any deviation from an isotropic Maxwellian distribution may be unstable and result in wave generation. Using data from the ion mass spectrometer IMA (Ion Mass Analyzer) and the magnetometer (MAG) onboard Venus Express, we study …
SPECTRUM: Synthetic Spectral Calculations for Global Space Plasma Modeling
Gombosi, T. I.; Toth, G.; Landi, E. +3 more
High-resolution spectroscopy is the most accurate tool for measuring the properties of the solar corona. However, interpreting measured line intensities and line profiles emitted by the optically thin solar corona is complicated by line-of-sight (LOS) integration, which leads to measuring weighted averages of the plasma properties along the LOS. L…
Improving statistical sensitivity of X-ray searches for axion-like particles
Conlon, Joseph P.; Rummel, Markus
X-ray observations of bright AGNs in or behind galaxy clusters offer unique capabilities to constrain axion-like particles. Existing analysis technique relies on measurements of the global goodness of fit. We develop a new analysis methodology that improves the statistical sensitivity to ALP-photon oscillations by isolating the characteristic quas…
Revising More Than 20 Years of EPHIN Ion Flux Data—A New Data Product for Space Weather Applications
Heber, B.; Kühl, P.
Solar energetic particle events and galactic cosmic rays are important aspects of space weather. Investigating them requires consistent measurements of electrons and ions over long time periods, that is, over more than a solar cycle. The Electron Proton Helium INstrument onboard the SOlar and Heliospheric Observatory is operational since 1995 and …