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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
Hubble Space Telescope Snapshot Search for Planetary Nebulae in Globular Clusters of the Local Group
Bond, Howard E.
Single stars in ancient globular clusters (GCs) are believed incapable of producing planetary nebulae (PNs), because their post-asymptotic-giant-branch evolutionary timescales are slower than the dissipation timescales for PNs. Nevertheless, four PNs are known in Galactic GCs. Their existence likely requires more exotic evolutionary channels, incl…
X-Ray Emission from the Taffy (VV254) Galaxies and Bridge
Boulanger, F.; Helou, G.; Appleton, P. N. +11 more
We present the first X-ray observations of the Taffy galaxies (UGC 12914/5) with the Chandra observatory and detect soft X-ray emission in the region of the gas-rich, radio-continuum-emitting Taffy bridge. The results are compared to Herschel observations of dust and diffuse [C ii] line-emitting gas. The diffuse component of the Taffy bridge has a…
Pulse-phase dependence of emission lines in the X-ray pulsar 4U 1626-67
Paul, Biswajit; Beri, Aru; Dewangan, Gulab C.
We present results from a pulse-phase-resolved spectroscopy of the complex emission lines around 1 keV in the unique accretion-powered X-ray pulsar 4U 1626-67, using the observation made with XMM-Newton in 2003. In this source, the redshifted and blueshifted emission lines and the linewidths measured earlier with Chandra suggest their accretion-di…
A Spitzer/IRAC characterization of Galactic AGB and RSG stars
Fazio, Giovanni G.; Reiter, Megan; Marengo, Massimo +1 more
We present new Spitzer/InfraRed Array Camera (IRAC) observations of 55 dusty long-period variables (48 asymptotic giant branch, AGB, and 6 red supergiant stars) in the Galaxy that have different chemistry, variability type, and mass-loss rate. O-rich AGB stars (including intrinsic S-type) tend to have redder [3.6]-[8.0] colours than carbon stars f…
Geometric characterization of the Arjuna orbital domain
de la Fuente Marcos, R.; de la Fuente Marcos, C.
Arjuna-type orbits are characterized by being Earth-like, having both low-eccentricity and low-inclination. Objects following these trajectories experience repeated trappings in the 1:1 commensurability with the Earth and can become temporary Trojans, horseshoe librators, quasi-satellites, and even transient natural satellites. Here, we review wha…
Non-detection of post-eclipse changes in Io's Jupiter-facing atmosphere: Evidence for volcanic support?
Tsang, Constantine C. C.; Spencer, John R.; Jessup, Kandis Lea
We present observations of Io's tenuous lower atmosphere on the Jupiter-facing hemisphere at ultraviolet wavelengths, from 2100 to 2250 Å, using the Hubble Space Telescope's Cosmic Origins Spectrometer, during the period immediately after Io emerges from Jupiter eclipse. The density of an atmosphere dominantly controlled by frost sublimation is hi…
Estimation of cold plasma outflow during geomagnetic storms
André, M.; Eriksson, A.; Haaland, S. +11 more
Low-energy ions of ionospheric origin constitute a significant contributor to the magnetospheric plasma population. Measuring cold ions is difficult though. Observations have to be done at sufficiently high altitudes and typically in regions of space where spacecraft attain a positive charge due to solar illumination. Cold ions are therefore shiel…