Search Publications
A ∼32-70 K Formation Temperature Range for the Ice Grains Agglomerated by Comet 67 P/Churyumov-Gerasimenko
Altwegg, K.; Rubin, M.; Mousis, O. +4 more
Grand Canonical Monte Carlo simulations are used to reproduce the N2/CO ratio ranging between 1.7 × 10-3 and 1.6 × 10-2 observed in situ in the Jupiter-family comet 67 P/Churyumov-Gerasimenko (67 P) by the ROSINA mass spectrometer on board the Rosetta spacecraft. By assuming that this body has been agglomerated fro…
Solar type II radio bursts associated with CME expansions as shown by EUV waves
Selhorst, C. L.; Cunha-Silva, R. D.; Fernandes, F. C. R.
Aims: We investigate the physical conditions of the sources of two metric type II bursts associated with coronal mass ejection (CME) expansions with the aim of verifying the relationship between the shocks and the CMEs by comparing the heights of the radio sources and of the extreme-ultraviolet (EUV) waves associated with the CMEs.
Metho…
Discovery of a new bona fide luminous blue variable in Norma
Berdnikov, L. N.; Gvaramadze, V. V.; Kniazev, A. Y.
We report the results of optical spectroscopy of the candidate evolved massive star MN44 revealed via detection of a circular shell with the Spitzer Space Telescope. First spectra taken in 2009 May-June showed the Balmer lines in emission as well as numerous emission lines of iron, which is typical of luminous blue variables (LBVs) near the visual…
Nucleus and Mass Loss from Active Asteroid 313P/Gibbs
Mutchler, Max; Jewitt, David; Agarwal, Jessica +3 more
We present Hubble Space Telescope observations of active asteroid 313P/Gibbs (formerly P/2014 S4) taken over the five month interval from 2014 October to 2015 March. This object has been recurrently active near perihelion (at 2.4 AU) in two different orbits, a property that is naturally explained by the sublimation of near surface ice but which is…
Bayesian evidence of the post-Planck curvaton
Byrnes, Christian T.; Hardwick, Robert J.
We perform a Bayesian model comparison for scenarios within the quadratic curvaton model, determining the degree to which both are disfavoured with respect to the ΛCDM concordance model and single-field quadratic inflation, using the recent Planck data release. Despite having three additional model parameters, the simplest curvaton scenario is not…
A Deep XMM-Newton Survey of M33: Point-source Catalog, Source Detection, and Characterization of Overlapping Fields
Williams, Benjamin F.; Blair, William P.; Haberl, Frank +9 more
We have obtained a deep 8 field XMM-Newton mosaic of M33 covering the galaxy out to the D25 isophote and beyond to a limiting 0.2-4.5 keV unabsorbed flux of 5 × 10-16 erg cm-2 s-1 (L \gt 4 × 1034 erg s-1 at the distance of M33). These data allow complete coverage of the galaxy with …
Case and statistical studies on the evolution of hot flow anomalies
Zhao, L. L.; Zhang, H.; Wang, S. +1 more
Hot flow anomalies (HFAs) frequently observed near Earth's bow shock are phenomena resulting from the interaction between interplanetary discontinuities and Earth's bow shock. We identify 199 HFA events using Cluster data from 2001 to 2010 and divide these events into four categories according to the dynamic pressure profile, namely, "-+," "+-," "…
Transiting exoplanets from the CoRoT space mission. XXVII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit
Mazeh, T.; Aigrain, S.; Alonso, R. +50 more
Context. We present the discovery of two transiting extrasolar planets by the satellite CoRoT.
Aims: We aim at a characterization of the planetary bulk parameters, which allow us to further investigate the formation and evolution of the planetary systems and the main properties of the host stars.
Methods: We used the transit light curve …
A new stationary analytical model of the heliospheric current sheet and the plasma sheet
Malova, Helmi V.; Kislov, Roman A.; Khabarova, Olga V.
We develop a single-fluid 2-D analytical model of the axially symmetric thin heliospheric current sheet (HCS) embedded into the heliospheric plasma sheet (HPS). A HCS-HPS system has a shape of a relatively thin plasma disk limited by separatrices that also represent current sheets, which is in agreement with Ulysses observations in the aphelion, w…
A Detailed X-Ray Investigation of PSR J2021+4026 and the γ-Cygni Supernova Remnant
Cheng, K. S.; Takata, J.; Wang, Y. +9 more
We have investigated the field around the radio-quiet γ-ray pulsar, PSR J2021+4026, with a ~140 ks XMM-Newton observation and ~56 ks archival Chandra data. Through analyzing the pulsed spectrum, we show that the X-ray pulsation is purely thermal in nature, which suggests that the pulsation originated from a hot polar cap with T ~ 3 × 106