Publications (23)
Ground- and Space-Based Dust Observations of VV 191 Overlapping Galaxy Pair
C. Robertson, B. Holwerda, J. Young +12
The Balmer decrement (H/H) provides a constraint on attenuation, the cumulative effects of dust grains in the ISM. The ratio is a reliable spectroscopic tool for deriving t…
The Simultaneous Low State Spectral Energy Distribution of 1ES 2344+514 from Radio to Very High Energies
MAGIC Collaboration, J. AleksiÄ, L. A. Antonelli +191
[Abridged] Context. To construct and interpret the spectral energy distribution (SED) of BL Lacertae objects, simultaneous broad-band observations are mandatory. Aims. We present t…
A Census of Exoplanets in Orbits Beyond 0.5 AU via Space-based Microlensing
David P. Bennett, J. Anderson, J. -P. Beaulieu +16
A space-based gravitational microlensing exoplanet survey will provide a statistical census of exoplanets with masses greater than 0.1 Earth-masses and orbital separations ranging…
The MACHO Project LMC Variable Star Inventory: Classical Cepheids and AGB Variables
D. Alves, C. Alcock, K. Cook +18
This paper has been withdrawn by the author.
Overlap Zoo Beta: A Catalogue of ~800 Occulting Pairs in the DESI Legacy Survey using Citizen Science
T. Butrum, B. Holwerda, W. C. Keel +11
Overlapping galaxies, in which a foreground galaxy partially overlaps a background galaxy, offer a unique opportunity to measure dust attenuation, a key nuisance parameter in galax…
TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008
V. A. Acciari, E. Aliu, T. Arlen +103
We report on TeV gamma-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10m Cherenkov telescope. The excellent sensitivity of…
Probable Gravitational Microlensing towards the Galatic Bulge
C. Alcock, R. Allsman, T. Axelrod +13
The MACHO project carries out regular photometric monitoring of millions of stars in the Magellanic Clouds and Galactic Bulge, to search for very rare gravitational microlensing ev…
Lower bounds on photometric redshift errors from Type Ia supernovae templates
S. Asztalos, S. Nikolaev, W. de Vries +3
Cosmology with Type Ia supernovae heretofore has required extensive spectroscopic follow-up to establish a redshift. Though tolerable at the present discovery rate, the next genera…
Completing the Census of Exoplanets with the Microlensing Planet Finder (MPF)
David P. Bennett, J. Anderson, J. -P. Beaulieu +17
The MPF mission will provide a statistical census of exoplanets with masses greater than 0.1 Earth-masses and orbital separations ranging from 0.5AU to infinity. This includes anal…
Galaxy And Mass Assembly: The xSAGA Galaxy Complement in Nearby Galaxy Groups
B. W. Holwerda, S. Phillipps, S. Weerasooriya +5
Groups of galaxies are the intermediate density environment in which much of the evolution of galaxies is thought to take place. In spectroscopic redshift surveys, one can identify…
Towards A Census of Earth-mass Exo-planets with Gravitational Microlensing
J. P. Beaulieu, E. Kerins, S. Mao +26
Thirteen exo-planets have been discovered using the gravitational microlensing technique (out of which 7 have been published). These planets already demonstrate that super-Earths (…
Echoes from Ancient Supernovae in the Large Magellanic Cloud
A. Rest, N. B. Suntzeff, K. Olsen +13
In principle, the light from historical supernovae could still be visible as scattered-light echoes even centuries later. However, while echoes have been discovered around some nea…
Gravitational Microlensing Results from Macho
W. Sutherland, C. Alcock, R. Allsman +13
We provide a status report on our search for dark matter in our Galaxy in the form of massive compact halo objects (MACHOs), using gravitational microlensing of background stars. T…
The Galactic Exoplanet Survey Telescope (GEST)
D. P. Bennett, J. Bally, I. Bond +22
The Galactic Exoplanet Survey Telescope (GEST) will observe a 2 square degree field in the Galactic bulge to search for extra-solar planets using a gravitational lensing technique.…
Further empirical evidence for the non-linearity of the period-luminosity relations as seen in the Large Magellanic Cloud Cepheids
C. Ngeow, S. Kanbur, S. Nikolaev +3
(abridged) Recent studies, using OGLE data for LMC Cepheids in the optical, strongly suggest that the period-luminosity (PL) relation for the Large Magellanic Cloud (LMC) Cepheids…
Djehuty: A Code for Modeling Whole Stars in Three Dimensions
S. Turcotte, G. Bazan, J. Castor +11
The DJEHUTY project is an intensive effort at the Lawrence Livermore National Laboratory (LLNL) to produce a general purpose 3-D stellar structure and evolution code to study dynam…
A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common
T. Sumi, D. P. Bennett, I. A. Bond +104
We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with a planet-star mass ratio of q=[9.5 +/- 2.1] x 10^{-5} via gravitational microlensing. The planetary devia…
Wide-Field InfraRed Survey Telescope (WFIRST) Final Report
J. Green, P. Schechter, C. Baltay +51
In December 2010, NASA created a Science Definition Team (SDT) for WFIRST, the Wide Field Infra-Red Survey Telescope, recommended by the Astro 2010 Decadal Survey as the highest pr…
Mass-Losing Semiregular Variable Stars in Baade's Windows
C. Alard, J. Blommaert, C. Cesarsky +38
By cross-correlating the results of two recent large-scale surveys, the general properties of a well defined sample of semi-regular variable stars have been determined. ISOGAL mid-…
Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
M. Zub, A. Cassan, D. Heyrovsky +47
Aims: We present a detailed analysis of OGLE 2004-BLG-482, a relatively high-magnification single-lens microlensing event which exhibits clear extended-source effects. These events…
OGLE 2004-BLG-254: a K3 III Galactic Bulge Giant spatially resolved by a single microlens
A. Cassan, J. -P. Beaulieu, P. Fouque +37
We present an analysis of OGLE 2004-BLG-254, a high-magnification and relatively short duration microlensing event in which the source star, a Bulge K3-giant, has been spatially re…
The Performance and Scientific Rationale for an IR Imaging Fourier Transform Spectrograph on a Large Space Telescope
James R. Graham, Mark Abrams, C. Bennett +5
We describe a concept for an imaging spectrograph for a large orbiting observatory such as NASA's proposed Next Generation Space Telescope (NGST) based on an imaging Fourier transf…
An Extrasolar Planet Census with a Space-based Microlensing Survey
D. P. Bennett, J. Anderson, J. -P. Beaulieu +14
A space-based gravitational microlensing exoplanet survey will provide a statistical census of exoplanets with masses down to 0.1 Earth-masses and orbital separations ranging from…