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28 papers · 2 filters
Physical Conditoins in Orion's Veil II: A Multi-Component Study of the Line of Sight Toward the Trapezium
N. P. Abel, G. J. Ferland, C. R. O'Dell +2
Orion's Veil is an absorbing screen that lies along the line of sight to the Orion H II region. It consists of two or more layers of gas that must lie within a few parsecs of the T…
On the Dissociation Equilibrium of H2 in Very Cool, Helium-Rich White Dwarf Atmospheres
Piotr M. Kowalski
We investigate the dissociation equilibrium of in very cool, helium-rich white dwarf atmospheres. We present the solution of the non-ideal chemical equilibrium for the di…
Acceptances for Space-Based and Ground-Based Fluorescence Detectors, and Inference of the Neutrino-Nucleon Cross-Section above 10^19 eV
Sergio Palomares-Ruiz, Andrei Irimia, Thomas J. Weiler
Detection of ultra-high energy neutrinos will be useful for unraveling the dynamics of the most violent sources in the cosmos and for revealing the neutrino cross-section at extrem…
Supernovae constraints on dark energy and modified gravity models
M. C. Bento, O. Bertolami, N. M. C. Santos +1
We use the Type Ia Supernova gold sample to constrain the parameters of dark energy models namely the Cardassian, Dvali-Turner (DT) and generalized Chaplygin gas (GCG) models. In o…
Reconstructing K-essence
A. A. Sen
We present a model independent method of reconstructing the Lagrangian for the k-essence field driving the present acceleration of the universe. We consider the simplest k-essence…
Exploring the Lower Mass Function in the young open Cluster IC 4665
W. J. de Wit, J. Bouvier, F. Palla +8
We present a study of the young (30-100Myr) open cluster IC 4665 with the aim to determine the shape of the mass function well into the brown dwarf regime. We photometrically selec…
Structure formation and CMBR anisotropy spectrum in the inflessence model
A. A. Sen, V. F. Cardone, S. Capozziello +1
The inflessence model has recently been proposed in an attempt to explain both early inflation and present day accelerated expansion within a single mechanism. The model has been s…
Photometric selection of high-redshift type Ia supernovae
M. Sullivan, D. A. Howell, K. Perrett +26
We present a method for selecting high-redshift type Ia supernovae (SNe Ia) located via rolling SN searches. The technique, using both color and magnitude information of events fro…
Fundamental properties of pre-main sequence stars in young, southern star forming regions: metallicities
David J. James, Claudio Melo, Nuno C. Santos +1
Aims: The primary motivation for this project is to search for metal-rich star forming regions, in which, stars of super-solar metallicity will be created, as hopefully, will be ex…
A ~ 7.5 Earth-Mass Planet Orbiting the Nearby Star, GJ 876
E. J. Rivera, J. J. Lissauer, R. P. Butler +6
High precision, high cadence radial velocity monitoring over the past 8 years at the W. M. Keck Observatory reveals evidence for a third planet orbiting the nearby (4.69 pc) dM4 st…
Results from the Wide Angle Search for Planets Prototype (WASP0) III: Planet Hunting in the Draco Field
Stephen R. Kane, Andrew Collier Cameron, Keith Horne +5
The Wide Angle Search for Planets prototype (WASP0) is a wide-field instrument used to search for extra-solar planets via the transit method. Here we present the results of a monit…
Results from the Wide Angle Search for Planets Prototype (WASP0) II: Stellar Variability in the Pegasus Field
Stephen R. Kane, T. A. Lister, Andrew Collier Cameron +5
Recent wide-field photometric surveys which target a specific field for long durations are ideal for studying both long and short period stellar variability. Here we report on 75 v…
Gemini Spectroscopy of Supernovae from SNLS: Improving High Redshift SN Selection and Classification
D. A. Howell, M. Sullivan, K. Perrett +22
We present new techiques for improving the efficiency of supernova (SN) classification at high redshift using 64 candidates observed at Gemini North and South during the first year…
Spectra of High-Redshift Type Ia Supernovae and a Comparison with their Low-Redshift Counterparts
I. M. Hook, D. A. Howell, G. Aldering +32
We present spectra for 14 high-redshift (0.17 < z < 0.83) supernovae, which were discovered by the Supernova Cosmology Project as part of a campaign to measure cosmological paramet…
Dark Energy Models in the w - w' Plane
Robert J. Scherrer
We examine the behavior of dark energy models in the plane defined by w (the equation of state parameter for the dark energy) and w' (the derivative of w with respect to the logari…
Spectroscopic Observations and Analysis of the Unusual Type Ia SN 1999ac
The Supernova Cosmology Project, :, G. Garavini +55
We present optical spectra of the peculiar Type Ia supernova (SN Ia) 1999ac. The data extend from -15 to +42 days with respect to B-band maximum and reveal an event that is unusual…
Generalizing the generalized Chaplygin gas
A. A. Sen, Robert J. Scherrer
The generalized Chaplygin gas is characterized by the equation of state p = - A/rho^alpha, with alpha > -1 and w > -1. We generalize this model to allow for the cases where alpha <…
The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core
B. Sato, D. A. Fischer, G. W. Henry +18
Doppler measurements from Subaru and Keck have revealed radial velocity variations in the V=8.15, G0IV star HD 149026 consistent with a Saturn-Mass planet in a 2.8766 day orbit. Ph…
The Origin of T Tauri X-ray Emission: New Insights from the Chandra Orion Ultradeep Project
Thomas Preibisch, Yong -Cheol Kim, Fabio Favata +8
We use the data of the Chandra Orion Ultradeep Project (COUP) to study the nearly 600 X-ray sources that can be reliably identified with optically well characterized T Tauri stars…
Bright X-ray flares in Orion young stars from COUP: evidence for star-disk magnetic fields?
F. Favata, E. Flaccomio, F. Reale +5
We have analyzed a number of intense X-ray flares observed in the Chandra Orion Ultradeep Project (COUP), a 13 days observation of the Orion Nebula Cluster (ONC). Analysis of the f…
Z-bursts from the Virgo cluster
Andreas Ringwald, Thomas J. Weiler, Yvonne Y. Y. Wong
Resonant annihilation of ultra-high energy cosmic neutrinos (UHECnu) on the cosmic neutrino background (CnuB) into Z bosons--the Z-burst mechanism--and its associated absorption an…
A Multi-Instrument Study of the Helix Nebula Knots with the Hubble Space Telescope
C. R. O'Dell, W. J. Henney, G. J. Ferland
We have conducted a combined observational and theoretical investigation of the ubiquitous knots in the Helix Nebula (NGC 7293). We have constructed a combined hydrodynamic+radiati…
Restframe I-band Hubble diagram for type Ia supernovae up to redshift z ~0.5
The Supernova Cosmology Project, :, S. Nobili +35
We present a novel technique for fitting restframe I-band light curves on a data set of 42 Type Ia supernovae (SNe Ia). Using the result of the fit, we construct a Hubble diagram w…
Enhanced X-ray variability from V1647 Ori, the young star in outburst illuminating McNeil's Nebula
N. Grosso, J. H. Kastner, H. Ozawa +5
We report a ~38 ks X-ray observation of McNeil's Nebula obtained with XMM on 2004 April 4. V1647 Ori, the young star in outburst illuminating McNeil's Nebula, is detected with XMM…