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The WFC3 Galactic Bulge Treasury Program: A First Look at Resolved Stellar Population Tools
Thomas M. Brown, Kailash Sahu, Manuela Zoccali +12
[Abridged] When WFC3 is installed on HST, the community will have powerful new tools for investigating resolved stellar populations. The WFC3 Galactic Bulge Treasury program will o…
Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC Photometry
Will Clarkson, Kailash Sahu, Jay Anderson +11
We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted…
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 (…
OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
Subo Dong, Andrew Gould, Andrzej Udalski +81
We combine all available information to constrain the nature of OGLE-2005-BLG-071Lb, the second planet discovered by microlensing and the first in a high-magnification event. These…
Planets in the Galactic Bulge: Results from the SWEEPS Project
Kailash C. Sahu, Stefano Casertano, Jeff Valenti +13
The exoplanets discovered so far have been mostly around relatively nearby and bright stars. As a result, the host stars are mostly (i) in the Galactic disk, (ii) relatively massiv…
Limits on additional planetary companions to OGLE-2005-BLG-390L
D. Kubas, A. Cassan, M. Dominik +1
We investigate constraints on additional planets orbiting the distant M-dwarf star OGLE-2005-BLG-390L, around which photometric microlensing data has revealed the existence of the…
Integral-Field Spectroscopy of the Post Red Supergiant IRC +10420: evidence for an axi-symmetric wind
Ben Davies, René D. Oudmaijer, Kailash C. Sahu
We present NAOMI/OASIS adaptive-optics assisted integral-field spectroscopy of the transitional massive hypergiant IRC +10420, an extreme mass-losing star apparently in the process…
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…
Transiting extrasolar planetary candidates in the Galactic bulge
Kailash C. Sahu, Stefano Casertano, Howard E. Bond +13
More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to the reflex motions of their host stars, and…
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…
Long gamma-ray bursts and core-collapse supernovae have different environments
A. S. Fruchter, A. J. Levan, L. Strolger +30
When massive stars exhaust their fuel they collapse and often produce the extraordinarily bright explosions known as core-collapse supernovae. On occasion, this stellar collapse al…
Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
J. -P. Beaulieu, D. P. Bennett, P. Fouque +46
In the favoured core-accretion model of formation of planetary systems, solid planetesimals accumulate to build up planetary cores, which then accrete nebular gas if they are suffi…
On the Afterglow and Host Galaxy of GRB021004: A Comprehensive Study with the Hubble Space Telescope
J. P. U. Fynbo, J. Gorosabel, A. Smette +24
(Abridged) We report on HST observations of the late-time afterglow and host galaxy of GRB021004 (z=2.33). Although this GRB is one of the best observed so far, there is substantia…
Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations
D. Kubas, A. Cassan, J. P. Beaulieu +25
We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectr…
Stars in the Hubble Ultra Deep Field
N. Pirzkal, K. C. Sahu, A. Burgasser +11
We identified 46 unresolved source candidates in the Hubble Ultra Deep Field, down to i775 = 29.5. Unresolved objects were identified using a parameter S, which measures the deviat…
The Microlensing Planet Finder: Completing the Census of Extrasolar Planets in the Milky Way
D. P. Bennett, I. Bond, E. Cheng +21
The Microlensing Planet Finder (MPF) is a proposed Discovery mission that will complete the first census of extrasolar planets with sensitivity to planets like those in our own sol…
Potential Direct Single-Star Mass Measurement
H. Ghosh
We analyze the lightcurve of the microlensing event OGLE-2003-BLG-175/MOA-2003-BLG-45 and show that it has two properties that, when combined with future high resolution astrometry…
Limits on the Optical Brightness of the Epsilon Eridani Dust Ring
Charles Proffitt, Kailash Sahu, Mario Livio +10
The STIS/CCD camera on the {\em Hubble Space Telescope (HST)} was used to take deep optical images near the K2V main-sequence star Eridani in an attempt to find an optical coun…
OGLE-2003-BLG-238: Microlensing Mass Estimate of an Isolated Star
Guangfei Jiang, D. L. DePoy, A. Gal-Yam +38
Microlensing is the only known direct method to measure the masses of stars that lack visible companions. In terms of microlensing observables, the mass is given by M=(c^2/4G)\tild…
Probing the atmosphere of the bulge G5III star OGLE-2002-BUL-069 by analysis of microlense H alpha line
A. Cassan, J. P. Beaulieu, S. Brillant +25
We discuss high-resolution, time-resolved spectra of the caustic exit of the binary microlensing event OGLE 2002-BUL-69 obtained with UVES on the VLT. The source star is a G5III gi…
The Host Galaxy of GRB 990712
Lise Christensen, Jens Hjorth, Javier Gorosabel +4
We present a comprehensive study of the z=0.43 host galaxy of GRB 990712, involving ground-based photometry, spectroscopy, and HST imaging. The broad-band UBVRIJHKs photometry is u…
High-Precicison Limb-Darkening Measurement of a K3 Giant Using Microlensing
Dale L. Fields, M. D. Albrow, J. An +21
We obtain high-precision limb-darkening measurements in five bands (V, V_E, I_E, I, and H) for the K3 III (Teff=4200 K, [Fe/H]=+0.3, log(g)=2.3) source of the Galactic bulge microl…
Microlensing towards the Magellanic Clouds: Nature of the Lenses and Implications for Dark Matter
Kailash C. Sahu
(Abridged) A close scrutiny of the microlensing results towards the Magellanic clouds reveals that the stars within the Magellanic clouds are major contributors as lenses, and the…
PLANET II: A Microlensing and Transit Search for Extrasolar Planets
Penny D. Sackett, M. D. Albrow, J. -P. Beaulieu +16
Due to their extremely small luminosity compared to the stars they orbit, planets outside our own Solar System are extraordinarily difficult to detect directly in optical light. Ca…