Search Publications
Evolution of the stellar-merger red nova V1309 Scorpii: Spectral energy distribution analysis
Tylenda, R.; Kamiński, T.
Context. One very important object for understanding the nature of red novae is V1309 Sco. Its pre-outburst observations showed that, before its red-nova eruption in 2008, it was a contact binary quickly evolving to the merger of the components. It thus provided us with a direct evidence that the red novae result from stellar mergers.
Aims: W…
A Protosolar Nebula Origin for the Ices Agglomerated by Comet 67P/Churyumov-Gerasimenko
Wurz, P.; Altwegg, K.; Bieler, A. +10 more
The nature of the icy material accreted by comets during their formation in the outer regions of the protosolar nebula (PSN) is a major open question in planetary science. Some scenarios of comet formation predict that these bodies agglomerated from crystalline ices condensed in the PSN. Concurrently, alternative scenarios suggest that comets accr…
Ruling out the light weakly interacting massive particle explanation of the Galactic 511 keV line
Vincent, Aaron C.; Wilkinson, Ryan J.; BÅ`hm, Céline +1 more
Over the past few decades, an anomalous 511 keV gamma-ray line has been observed from the center of the Milky Way. Dark matter (DM) in the form of light (≲10 MeV ) weakly interacting massive particles (WIMPs) annihilating into electron-positron pairs has been one of the leading hypotheses of the observed emission. Given the small required cross se…
Solar cycle variations in the ionosphere of Mars as seen by multiple Mars Express data sets
Pätzold, M.; Lester, M.; Milan, S. E. +11 more
The response of the Martian ionosphere to solar activity is analyzed by taking into account variations in a range of parameters during four phases of the solar cycle throughout 2005-2012. Multiple Mars Express data sets have been used (such as Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) in Active Ionospheric Sounding, MARS…
Kinematic Downsizing at z ∼ 2
Barro, Guillermo; Trump, Jonathan R.; Weiner, Benjamin J. +8 more
We present results from a survey of the internal kinematics of 49 star-forming galaxies at z∼ 2 in the CANDELS fields with the Keck/MOSFIRE spectrograph, Survey in the near-Infrared of Galaxies with Multiple position Angles (SIGMA). Kinematics (rotation velocity V rot and gas velocity dispersion {σ }g) are measured from nebul…
Limits on the LyC signal from z ~ 3 sources with secure redshift and HST coverage in the E-CDFS field
Maccagni, D.; Giavalisco, M.; Thomas, R. +23 more
Context. Determining the strength of the Lyman continuum (LyC) and the fraction of LyC escape have implications for the properties of the emitting sources at any redshift, but also for the re-ionization of the Universe at z > 6.
Aims: We aim to measure the LyC signal from a sample of sources in the Chandra deep field south. We collect star…
The treatment of mixing in core helium burning models - II. Constraints from cluster star counts
Campbell, Simon W.; Constantino, Thomas; Lattanzio, John C. +1 more
The treatment of convective boundaries during core helium burning is a fundamental problem in stellar evolution calculations. In the first paper of this series, we showed that new asteroseismic observations of these stars imply they have either very large convective cores or semiconvection/partially mixed zones that trap g modes. We probe this mix…
Shapley Supercluster Survey: ram-pressure stripping versus tidal interactions in the Shapley supercluster
Bourdin, H.; Mazzotta, P.; Haines, C. P. +4 more
We present two new examples of galaxies undergoing transformation in the Shapley supercluster core. These low-mass (M_{star }∼ 0.4-1× 10^{10} M⊙) galaxies are members of the two clusters SC 1329-313 (z ∼ 0.045) and SC 1327-312 (z ∼ 0.049). Integral-field spectroscopy complemented by imaging in the ugriK bands and in Hα narrow band is us…
Star Formation Suppression Due to Jet Feedback in Radio Galaxies with Shocked Warm Molecular Gas
Alatalo, Katherine; Lanz, Lauranne; Ogle, Patrick M. +1 more
We present Herschel observations of 22 radio galaxies, selected for the presence of shocked, warm molecular hydrogen emission. We measured and modeled spectral energy distributions in 33 bands from the ultraviolet to the far-infrared to investigate the impact of jet feedback on star formation activity. These galaxies are massive, early-type galaxi…
Variations of water vapor and cloud top altitude in the Venus' mesosphere from SPICAV/VEx observations
Montmessin, F.; Fedorova, A.; Korablev, O. +3 more
SPICAV VIS-IR spectrometer on-board the Venus Express mission measured the H2O abundance above Venus' clouds in the 1.38 µm band, and provided an estimation of the cloud top altitude based on CO2 bands in the range of 1.4-1.6 µm. The H2O content and the cloud top altitude have been retrieved for the com…