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The first gradual solar energetic particle event with an enhanced 3He abundance on Solar Orbiter
Lario, D.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +16 more
The origin of 3He abundance enhancements in gradual solar energetic particle (SEP) events remains largely unexplained. Two mechanisms have been suggested: the reacceleration of remnant flare material by coronal mass ejection (CME)-driven shocks in interplanetary space, and concomitant activity in the corona. We explore the first gradual…
Assessing slope uncertainties of martian Digital Elevation Models from numerical propagation of errors on synthetic geological surfaces
Quantin-Nataf, C.; Leyrat, C.; Millot, C. +2 more
Digital Elevation Models (DEM) are widely used in planetary sciences, including for the specific case of Mars. DEMs allow us to extract topography parameters necessary in geomorphological studies. However, DEMs are not free from vertical errors, which yields uncertainties in calculations of parameters such as local slopes. In addition, slope maps …
The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations
Schmidt, W.; Woch, J.; Solanki, S. K. +44 more
In order to make accurate inferences about the solar interior using helioseismology, it is essential to understand all the relevant physical effects on the observations. One effect to understand is the (complex-valued) ratio of the horizontal to vertical displacement of the p- and f-modes at the height at which they are observed. Unfortunately, it…
Correlation between the optical veiling and accretion properties. A case study of the classical T Tauri star DK Tau
Natta, A.; Ray, T.; Delvaux, C. +3 more
Context. Classical T Tauri stars (cTTs) accrete from their circumstellar disk. The material falls onto the stellar surface, producing an accretion shock, which generates veiling in a star's spectra. In addition, the shock causes a localized accretion spot at the level of the chromosphere.
Aims: Our goal is to investigate the accretion, partic…
Modeling Solar Orbiter dust detection rates in the inner heliosphere as a Poisson process
Zaslavsky, A.; Mann, I.; Kočiščák, S. +3 more
Context. Solar Orbiter provides dust detection capability in the inner heliosphere, but estimating physical properties of detected dust from the collected data is far from straightforward.
Aims: First, a physical model for dust collection considering a Poisson process is formulated. Second, it is shown that dust on hyperbolic orbits is respon…
The hyperluminous X‑ray source population
Roberts, T. P.; Walton, D. J.; MacKenzie, A. D. A.
We have recently published a catalog of 1843 candidate ultraluminous X‑ray sources (ULXs). This is the largest catalog of ULXs to date and was built by cross‑correlating recent serendipitous source catalogs from the XMM‑Newton, Swift, and Chandra observatories with a large sample of galaxies, primarily from HyperLEDA. The catalog contains 71 hyper…
The Influence of Cloud Condensation Nucleus Coagulation on the Venus Cloud Structure
Barth, Erika L.; McGouldrick, Kevin
We present the Venus version of PlanetCARMA and demonstrate the significance of coagulation properties on the structure of the Venus cloud system. The composition of the smallest mode of particles in the Venus atmosphere, which likely serve as cloud condensation nuclei (CCN), is unknown. Here we demonstrate that a change in the ability of CCN to g…
Shocklets and Short Large Amplitude Magnetic Structures (SLAMS) in the High Mach Foreshock of Venus
Raptis, Savvas; Karlsson, Tomas; Plaschke, Ferdinand +16 more
Shocklets and short large-amplitude magnetic structures (SLAMS) are steepened magnetic fluctuations commonly found in Earth's upstream foreshock. Here we present Venus Express observations from the 26th of February 2009 establishing their existence in the steady-state foreshock of Venus, building on a past study which found SLAMS during a substant…
A close-in planet orbiting giant star HD 167768
Izumiura, Hideyuki; Sato, Bun'ei; Yoshida, Michitoshi +12 more
We report the detection of a giant planet orbiting the G-type giant star HD 167768 from radial velocity measurements using the High Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory (OAO). HD 167768 has a mass of $1.08_{-0.12}^{+0.14}\, M_{\odot }$, a radius of $9.70_{-0.25}^{+0.25}\, R_{\odot }$, a metallicity of $[\mbo…
OGLE-2019-BLG-0825: Constraints on the Source System and Effect on Binary-lens Parameters Arising from a Five-day Xallarap Effect in a Candidate Planetary Microlensing Event
Peixinho, Nuno; Han, Cheongho; Udalski, Andrzej +90 more
We present an analysis of microlensing event OGLE-2019-BLG-0825. This event was identified as a planetary candidate by preliminary modeling. We find that significant residuals from the best-fit static binary-lens model exist and a xallarap effect can fit the residuals very well and significantly improves χ 2 values. On the other hand, b…