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22 papers · 2 filters
Opening the Treasure Chest: A Newborn Star Cluster Emerges from its Dust Pillar in Carina
Nathan Smith, Keivan G. Stassun, John Bally
We present detailed observations of the Treasure Chest, a compact nebula at the head of a dust pillar in the southern Carina nebula. This object is of interest because it is an exa…
The Dependence of Differential Rotation on Temperature and Rotation
J. R. Barnes, A. Collier Cameron, J. -F. Donati +3
We use Doppler imaging techniques to determine the dependence of starspot rotation rates on latitude in an homogeneous sample of young, rapidly-rotating solar analogues. A solar-li…
Spectroscopic confirmation of high-redshift supernovae with the ESO VLT
C. Lidman, D. A. Howell, G. Folatelli +44
We present VLT FORS1 and FORS2 spectra of 39 candidate high-redshift supernovae that were discovered as part of a cosmological study using Type Ia supernovae (SNe Ia) over a wide r…
Non-Ideal Equation of State, Refraction and Opacities in Very Cool, Helium-Rich White Dwarf Atmospheres
P. M. Kowalski, D. Saumon, S. Mazevet
The atmospheres of cool, helium-rich white dwarfs constitute an exotic and poorly explored physical regime of stellar atmospheres. Under physical conditions where the temperature v…
Phantom Dark Energy, Cosmic Doomsday, and the Coincidence Problem
Robert J. Scherrer
Phantom dark energy models, with w < -1, are characterized by a future singularity and therefore a finite lifetime for the universe. Because the future singularity is triggered by…
A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436
Paul Butler, Steven S. Vogt, Geoffrey W. Marcy +5
We report precise Doppler measurements of GJ 436 (M2.5V) obtained at Keck Observatory. The velocities reveal a planetary companion with orbital period of 2.644 d, eccentricity of 0…
An X-ray Outburst from the Rapidly Accreting Young Star That Illuminates McNeil's Nebula
J. H. Kastner, M. Richmond, N. Grosso +6
Young, low-mass stars are luminous X-ray sources whose powerful X-ray flares may exert a profound influence over the process of planet formation. The origin of such emission is unc…
A Cluster of 1.3 cm Continuum Sources in OMC1 South
Luis A. Zapata, Luis F. Rodriguez, Stanley E. Kurtz +2
We present sensitive 1.3 cm radio continuum observations of the region OMC1 South (OMC-1S) in Orion using the Very Large Array in its B configuration. We detect eleven radio source…
ISO Observations of the 53W002 Group at 6.7 microns: In Search of the Oldest Stellar Populations at z=2.4
W. C. Keel, W. Wu, P. P. van der Werf +5
We present a deep ISO observation at 6.7 microns of the 53W002 group of galaxies and AGN at z=2.4. This approximately samples the emitted K band. The faint, blue star-forming objec…
Results from the Wide Angle Search for Planets Prototype (WASP0) I: Analysis of the Pegasus Field
Stephen R. Kane, Andrew Collier Cameron, Keith Horne +5
WASP0 is a prototype for what is intended to become a collection of wide-angle survey instruments whose primary aim is to detect extra-solar planets transiting across the face of t…
Do Fermions and Bosons Produce the Same Gravitational Field?
John D. Barrow, Robert J. Scherrer
We examine some cosmological consequences of gravity coupling with different strength to fermions and bosons. We show that this leads to a different perturbation of the standard pi…
Gamma ray bursts and the origin of galactic positrons
Gianfranco Bertone, Alexander Kusenko, Sergio Palomares-Ruiz +2
A recent observation of the 511 keV electron-positron annihilation line from the Galactic bulge has prompted a debate on the origin of the galactic positrons responsible for this e…
Physical Conditions in Orion's Veil
N. P. Abel, C. L. Brogan, G. J. Ferland +3
Orion's veil consists of several layers of largely neutral gas lying between us and the main ionizing stars of the Orion nebula. It is visible in 21cm H I absorption and in optical…
Spectroscopic Observations and Analysis of the Peculiar SN 1999aa
G. Garavini, G. Folatelli, A. Goobar +55
We present an extensive new time-series of spectroscopic data of the peculiar SN 1999aa in NGC 2595. Our data set includes 25 optical spectra between -11 and +58 days with respect…
Neutrino Bursts from Fanaroff-Riley I Radio Galaxies
Luis A. Anchordoqui, Haim Goldberg, Francis Halzen +1
On the basis of existing observations (at the 4.5 σlevel) of TeV gamma-ray outbursts from the Fanaroff-Riley I (FRI) radio galaxy Centaurus A, we estimate the accompanying neutrino…
Shock Compression of Deuterium and the Interiors of Jupiter and Saturn
D. Saumon, T. Guillot
Recently, deuterium has been the focus of a high level of experimental and theoretical activity that was sparked by a disagreement on the experimental value of the maximum compress…
Compact Radio Sources in Orion: New Detections, Time Variability, and Objects in OMC-1S
Luis A. Zapata, Luis F. Rodriguez, Stanley E. Kurtz +1
We present the analysis of four 3.6 cm radio continuum archival observations of Orion obtained using the Very Large Array in its A-configuration, with angular resolu…
Low reheating temperature and the visible sterile neutrino
G. Gelmini, S. Palomares-Ruiz, S. Pascoli
We present here a scenario, based on a low reheating temperature T_R << 100 MeV at the end of (the last episode of) inflation, in which the coupling of sterile neutrinos to active…
X-ray Properties of Pre--Main-Sequence Stars in the Orion Nebula Cluster with Known Rotation Periods
Keivan G. Stassun, David R. Ardila, Mary Barsony +2
We re-analyze all archival Chandra/ACIS observations of the Orion Nebula Cluster (ONC) to study the X-ray properties of a large sample of pre--main-sequence (PMS) stars with optica…
The Coronal X-ray Spectrum of the Multiple Weak-Lined T Tauri Star System HD 98800
Joel H. Kastner, David P. Huenemoerder, Norbert S. Schulz +3
We present high-resolution X-ray spectra of the multiple (hierarchical quadruple) weak-lined T Tauri star system HD 98800, obtained with the High Energy Transmission Gratings Spect…
Radiative transfer in the refractive atmospheres of very cool white dwarfs
P. M. Kowalski, D. Saumon
We consider the problem of radiative transfer in stellar atmospheres where the index of refraction departs from unity and is a function of density and temperature. We present modif…
Purely kinetic k-essence as unified dark matter
Robert J. Scherrer
We examine k-essence models in which the Lagrangian p is a function only of the derivatives of a scalar field phi and does not depend explicity on phi. The evolution of phi for an…