Search Publications
Planck 2013 results. XXVI. Background geometry and topology of the Universe
Miville-Deschênes, M. -A.; Bernard, J. -P.; Planck Collaboration +226 more
The new cosmic microwave background (CMB) temperature maps from Planck provide the highest-quality full-sky view of the surface of last scattering available to date. This allows us to detect possible departures from the standard model of a globally homogeneous and isotropic cosmology on the largest scales. We search for correlations induced by a p…
Discriminating the Progenitor Type of Supernova Remnants with Iron K-shell Emission
Safi-Harb, Samar; Maeda, Yoshitomo; Petre, Robert +11 more
Supernova remnants (SNRs) retain crucial information about both their parent explosion and circumstellar material left behind by their progenitor. However, the complexity of the interaction between supernova ejecta and ambient medium often blurs this information, and it is not uncommon for the basic progenitor type (Ia or core-collapse) of well-st…
Near-infrared spectra of ferrous mineral mixtures and methods for their identification in planetary surface spectra
Bell, James F.; Cloutis, Edward A.; Mann, Paul +1 more
Iron-bearing minerals are a major component of planetary surfaces, and many can be identified by their characteristic absorption bands in the near-infrared (NIR). Here we present laboratory NIR spectra of a wide range of common Fe-bearing minerals (e.g., olivines, pyroxenes), glasses, and mineral/glass mixtures. We then use this suite of spectra t…
Cobalt-56 γ-ray emission lines from the type Ia supernova 2014J
Sunyaev, R.; Sazonov, S.; Churazov, E. +8 more
A type Ia supernova is thought to be a thermonuclear explosion of either a single carbon-oxygen white dwarf or a pair of merging white dwarfs. The explosion fuses a large amount of radioactive 56Ni (refs 1-3). After the explosion, the decay chain from 56Ni to 56Co to 56Fe generates γ-ray photons, which a…
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. II. The Most Luminous Standard Candles in the Universe
Kaspi, Shai; Netzer, Hagai; Du, Pu +8 more
This is the second in a series of papers reporting on a large reverberation mapping (RM) campaign to measure black hole (BH) mass in high accretion rate active galactic nuclei (AGNs). The goal is to identify super-Eddington accreting massive black holes (SEAMBHs) and to use their unique properties to construct a new method for measuring cosmologic…
A luminous, blue progenitor system for the type Iax supernova 2012Z
Foley, Ryan J.; Riess, Adam G.; Kirshner, Robert P. +6 more
Type Iax supernovae are stellar explosions that are spectroscopically similar to some type Ia supernovae at the time of maximum light emission, except with lower ejecta velocities. They are also distinguished by lower luminosities. At late times, their spectroscopic properties diverge from those of other supernovae, but their composition (dominate…
Time-dependent modeling of TeV-detected, young pulsar wind nebulae
Torres, D. F.; de Oña Wilhelmi, E.; Cillis, A. +1 more
The increasing sensitivity of instruments at X-ray and TeV energies has revealed a large number of nebulae associated with bright pulsars. Despite this large data set, the observed pulsar wind nebulae (PWNe) do not show a uniform behavior and the main parameters driving features like luminosity, magnetization, and others are still not fully unders…
Hubble Space Telescope hot Jupiter transmission spectral survey: a detection of Na and strong optical absorption in HAT-P-1b
Aigrain, S.; Pont, F.; Fortney, J. J. +16 more
We present an optical to near-infrared transmission spectrum of the hot Jupiter HAT-P-1b, based on Hubble Space Telescope observations, covering the spectral regime from 0.29 to 1.027 µm with Space Telescope Imaging Spectrograph (STIS), which is coupled with a recent Wide Field Camera 3 (WFC3) transit (1.087 to 1.687 µm). We derive ref…
Testing the interaction between dark energy and dark matter with Planck data
Ferreira, Elisa G. M.; Costa, André A.; Abdalla, E. +2 more
Interacting dark energy and dark matter is used to go beyond the standard cosmology. We base our arguments on Planck data and conclude that an interaction is compatible with the observations and can provide a strong argument towards consistency of different values of cosmological parameters.
A Herschel [C ii] Galactic plane survey. II. CO-dark H2 in clouds
Goldsmith, P. F.; Langer, W. D.; Pineda, J. L. +2 more
Context. H i and CO large scale surveys of the Milky Way trace the diffuse atomic clouds and the dense shielded regions of molecular hydrogen clouds, respectively. However, until recently, we have not had spectrally resolved C+ surveys in sufficient lines of sight to characterize the ionized and photon dominated components of the inters…