Gaudi, B. Scott, Bennett, David P., Bond, Ian A., Dong, Subo, Gould, Andrew, ...
In the currently-favored paradigm of planet formation, the location of the snow line in the protoplanetary disk plays a crucial role. Determining the demographics of planets beyond the snow line of...
MARVELS: Revealing the Formation and Dynamical Evolution of Giant Planet Systems (2009)
Ge, Jian, Eisenstein, Daniel, Gaudi, B. Scott
MARVELS, the Multi-Object APO Radial Velocity Exoplanet Large-area Survey, is a 6-year program to characterize the distribution of gas giant planets with orbital periods ranging from several hours to...
Analytic approximations for transit light curve observables and uncertainties (2008)
Carter, Joshua A., Yee, Jennifer C., Eastman, Jason, Gaudi, B. Scott, Winn, Joshua N.
The light curve of an exoplanetary transit can be used to estimate the planetary radius and other parameters of interest. Because accurate parameter estimation is a non-analytic and computationally...
The prograde orbit of exoplanet TrES-2b (2008)
Winn, Joshua N., Johnson, John Asher, Narita, Norio, Suto, Yasushi, Turner, Edwin L., Fischer, Debra A., ...
We monitored the Doppler shift of the G0 V star TrES-2 throughout a transit of its giant planet. The anomalous Doppler shift due to stellar rotation (the Rossiter-McLaughlin effect) is discernible in...
Getting More For Your Money: Identifying and Confirming Long-Period Planets with Kepler (2008)
Yee, Jennifer C., Gaudi, B. Scott
Kepler will monitor enough stars that it is likely to detect single transits of planets with periods longer than the mission lifetime. We show that by combining the Kepler photometry of such transits...
Characterizing Long-Period Transiting Planets Observed by Kepler (2008)
Yee, Jennifer C., Gaudi, B. Scott
Kepler will monitor a sufficient number of stars that it is likely to detect single transits of planets with periods longer than the mission lifetime. We show that by combining the exquisite Kepler...
A Characteristic Planetary Feature in Double-Peaked, High-Magnification Microlensing Events (2008)
Han, Cheongho, Gaudi, B. Scott
A significant fraction of microlensing planets have been discovered in high-magnification events, and a significant fraction of these events exhibit a double-peak structure at their peak. However,...
Analytic Approximations for Transit Light Curve Observables, Uncertainties, and Covariances (2008)
Carter, Joshua A., Yee, Jennifer C., Eastman, Jason, Gaudi, B. Scott, Winn, Joshua N.
The light curve of an exoplanetary transit can be used to estimate the planetary radius and other parameters of interest. Because accurate parameter estimation is a non-analytic and computationally...
The Prograde Orbit of Exoplanet TrES-2b (2008)
Winn, Joshua N., Johnson, John Asher, Narita, Norio, Suto, Yasushi, Turner, Edwin L., Fischer, Debra A., ...
We monitored the Doppler shift of the G0V star TrES-2 throughout a transit of its giant planet. The anomalous Doppler shift due to stellar rotation (the Rossiter-McLaughlin effect) is discernible in...
Predicting the Yields of Photometric Surveys for Transiting Extrasolar Planets (2008)
Beatty, Thomas G., Gaudi, B. Scott
We develop a method for predicting the yield of transiting planets from a photometric survey given the parameters of the survey (nights observed, bandpass, exposure time, telescope aperture,...
A High-Resolution Spectrum of the Highly Magnified Bulge G-Dwarf MOA-2006-BLG-099S (2008)
Johnson, Jennifer A., Gaudi, B. Scott, Sumi, Takahiro, Bond, Ian A., Gould, Andrew
We analyze a high-resolution spectrum of a microlensed G-dwarf in the Galactic bulge, acquired when the star was magnified by a factor of 110. We measure a spectroscopic temperature, derived from the...
Microlensing Searches for Planets: Results and Future Prospects (2007)
Microlensing is potentially sensitive to multiple-planet systems containing analogs of all the solar system planets except Mercury, as well as to free floating planets. I review the landscape of...
A New Low-Mass Eclipsing Binary from SDSS-II (2007)
Blake, Cullen H., Torres, Guillermo, Bloom, Joshua S., Gaudi, B. Scott
We present observations of a new low-mass double-lined eclipsing binary system discovered using repeat observations of the celestial equator from the Sloan Digital Sky Survey II. Using near-infrared...
Role of Dynamical Research in the Detection and Characterization of Exoplanets (2007)
Ford, Eric B., Adams, Fred C., Armitage, Phil, Gaudi, B. Scott, Malhotra, Renu, Holman, Mathew J., ...
(Abridged) The discovery of extrasolar planetary systems revealed an unexpected diversity of planetary systems that has revolutionized planet formation theory. A strong program of theoretical...
On constraining a transiting exoplanet's rotation rate with its transit spectrum (2007)
Spiegel, David S., Haiman, Zoltan, Gaudi, B. Scott
We investigate the effect of planetary rotation on the transit spectrum of an extrasolar giant planet. During ingress and egress, absorption features arising from the planet's atmosphere are Doppler...
Ground-based Microlensing Surveys (2007)
Gould, Andrew, Gaudi, B. Scott, Bennett, David P.
Microlensing is a proven extrasolar planet search method that has already yielded the detection of four exoplanets. These detections have changed our understanding of planet formation ``beyond the...
Detecting and Characterizing Planetary Systems with Transit Timing (2007)
Steffen, Jason H., Gaudi, B. Scott, Ford, Eric B., Agol, Eric, Holman, Mathew J.
In the coming decades, research in extrasolar planets aims to advance two goals: 1) detecting and characterizing low-mass planets increasingly similar to the Earth, and 2) improving our understanding...
Discovery of a Very Bright, Nearby Gravitational Microlensing Event (2007)
Gaudi, B. Scott, Patterson, Joseph, Spiegel, David S., Krajci, Thomas, Koff, R., Pojmanski, G., ...
We report the serendipitous detection of a very bright, very nearby microlensing event. In late October 2006, an otherwise unremarkable A0 star at a distance ~1 kpc (GSC 3656-1328) brightened...
Statistics and Simulations of Transit Surveys for Extrasolar Planets (2006)
The yields from transit surveys can be used to constrain the frequency and statistical properties of extrasolar planets. Conversely, planet frequencies can be used to estimate expected detection...
Characterization of Gravitational Microlensing Planetary Host Stars (2006)
Bennett, David P., Anderson, Jay, Gaudi, B. Scott
The gravitational microlensing light curves that reveal the presence of extrasolar planets generally yield the planet-star mass ratio and separation in units of the Einstein ring radius. The...
Observational Constraints on Trojans of Transiting Extrasolar Planets (2006)
Ford, Eric B., Gaudi, B. Scott
Theoretical studies predict that Trojans are likely a frequent byproduct of planet formation and evolution. We present a novel method of detecting Trojan companions to transiting extrasolar planets...
Gaudi, B. Scott, Winn, Joshua N.
The Rossiter-McLaughlin (RM) effect is the distortion of stellar spectral lines that occurs during eclipses or transits, due to stellar rotation. We assess the future prospects for using the RM...
Gould, Andrew, Dorsher, Susan, Gaudi, B. Scott, Udalski, Andrzej
We derive the frequencies of hot Jupiters (HJs) with 3--5 day periods and very hot Jupiters (VHJs) with 1-3 day periods by comparing the planets actually detected in the OGLE-III survey with those...
Gould, Andrew, Dorsher, Susan, Gaudi, B. Scott, Udalski, Andrzej
We derive the frequencies of hot Jupiters (HJs) with 3--5 day periods and very hot Jupiters (VHJs) with 1-3 day periods by comparing the planets actually detected in the OGLE-III survey with those...
Gould, Andrew, Dorsher, Susan, Gaudi, B. Scott, Udalski, Andrzej
We derive the frequencies of hot Jupiters (HJs) with 3--5 day periods and very hot Jupiters (VHJs) with 1-3 day periods by comparing the planets actually detected in the OGLE-III survey with those...
Burke, Christopher J., Gaudi, B. Scott, DePoy, D. L., Pogge, Richard W.
We analyze a 19-night photometric search for transiting extrasolar planets in the open cluster NGC 1245. An automated transit search algorithm with quantitative selection criteria finds six transit...
Toward the Detection of Transiting Hot Earths and Hot Neptunes in Open Clusters (2005)
Pepper, Joshua, Gaudi, B. Scott
Radial velocity searches for extrasolar planets have recently detected several very low mass (7-20M_Earth) planets in close orbits with periods 1%. The majority of planets will be detected around M...
The Hypervelocity Star SDSS J090745.0+024507 is a Short-Period Variable (2005)
Fuentes, Cesar I., Stanek, K. Z., Gaudi, B. Scott, McLeod, Brian A., Bogdanov, Slavko B., Hartman, Joel D., ...
We present high-precision photometry of the hypervelocity star SDSS J090745.0+024507 (HVS), which has a Galactic rest-frame radial velocity of v=709 km/s, and so has likely been ejected from the...
The Transit Light Curve Project. IV. Five Transits of the Exoplanet OGLE-TR-10b (2005)
Holman, Matthew J., Winn, Joshua N., Fuentes, Cesar I., Hartman, Joel D., Stanek, K. Z., Torres, Guillermo, ...
We present I and B photometry of five distinct transits of the exoplanet OGLE-TR-10b. By modeling the light curves, we find the planetary radius to be R_P = 1.06 +/- 0.08 R_Jup and the stellar radius...
Astrometric Microlensing Constraints on a Massive Body in the Outer Solar System with Gaia (2005)
Gaudi, B. Scott, Bloom, Joshua S.
A body in Solar orbit beyond the Kuiper belt exhibits an annual parallax that exceeds its apparent proper motion by up to many orders of magnitude. Apparent motion of this body along the parallactic...
On the Size Distribution of Close-In Extrasolar Giant Planets (2005)
The precisions of extrasolar planet radius measurements are reaching the point at which meaningful and discriminatory comparisons with theoretical predictions are can be made. However, care must be...
On the Rotation Period of (90377) Sedna (2005)
Gaudi, B. Scott, Stanek, Krzysztof Z., Hartman, Joel D., Holman, Matthew J., McLeod, Brian A.
We present precise, ~1%, r-band relative photometry of the unusual solar system object (90377) Sedna. Our data consist of 143 data points taken over eight nights in October 2004 and January 2005. The...
Identifying Lenses with Small-Scale Structure. II. Fold Lenses (2005)
Keeton, Charles R., Gaudi, B. Scott, Petters, A. O.
When the source in a 4-image gravitational lens lies close to a "fold" caustic, two of the lensed images lie close together. If the lens potential is smooth on the scale of the separation between the...
Microlensing Characterization of Wide-Separation Planets (2004)
Han, Cheongho, Gaudi, B. Scott, An, Jin H., Gould, Andrew
With their excellent photometric precision and dramatic increase in monitoring frequency, future microlensing survey experiments are expected to be sensitive to very short time-scale, isolated events...
On the Period Distribution of Close-In Extrasolar Giant Planets (2004)
Gaudi, B. Scott, Seager, Sara, Mallen-Ornelas, Gabriela
Transit (TR) surveys for extrasolar planets have recently uncovered a population of ``very hot Jupiters,'' planets with orbital periods of P< 3 d. At first sight this may seem surprising, given that...
Prospects for the Detection of Earth-Mass Planets (2004)
Gould, Andrew, Gaudi, B. Scott, Han, Cheongho
We compare potential state-of-the-art experiments for detecting Earth-mass planets around main-sequence stars using radial velocities, transits, astrometry, and microlensing. For...
Kepler and the Kuiper Belt (2004)
The proposed field-of-view of the Kepler mission is at an ecliptic latitude of ~55 degrees, where the surface density of scattered Kuiper Belt Objects (KBOs) is a few percent that in the ecliptic...
The Many Possible Interpretations of Microlensing Event OGLE-2002-BLG-055 (2004)
Gaudi, B. Scott, Han, Cheongho
Microlensing event OGLE-2002-BLG-055 is characterized by a smooth, slightly asymmetric single-lens curve with an isolated, secure data point that is ~0.6 magnitudes brighter than neighboring points...
Microlensing of Elliptical Sources by Fold Caustics (2004)
Gaudi, B. Scott, Haiman, Zoltan
We consider microlensing of an elliptical source crossing a fold caustic. We derive a simple expression for the light curve of a source with uniform surface brightness that is accurate to third order...
Burke, Christopher J., Gaudi, B. Scott, DePoy, D. L., Pogge, Richard W., Pinsonneault, Marc H.
We derive fundamental parameters for the old, rich open cluster NGC 1245 using BVI photometry from the MDM 1.3m and 2.4m telescopes. Based on detailed isochrone fitting, we find NGC 1245 has a...
Extremely Close-In Giant Planets from Tidal Capture (2003)
Planets that form around stars born in dense stellar environments are subject to dynamical perturbations from other stars in the system. These perturbations will strip outer planets, forming a...
Resolving the Microlens Mass Degeneracy for Earth-Mass Planets (2003)
Gould, Andrew, Gaudi, B. Scott, Han, Cheongho
Of all planet-finding techniques, microlensing is potentially the most sensitive to Earth-mass planets. However, microlensing lightcurves generically yield only the planet-star mass ratio: the mass...
Loeb, Abraham, Gaudi, B. Scott
Upcoming space-based photometric satellites offer the possibility of detecting continuum flux variability at the micro-magnitude level. We show that the Doppler flux variability induced by the reflex...
Identifying Lenses with Small-Scale Structure. I. Cusp Lenses (2002)
Keeton, Charles R., Gaudi, B. Scott, Petters, A. O.
The inability of standard models to explain the flux ratios in many 4-image gravitational lenses has been cited as evidence for significant small-scale structure in lens galaxies. That claim has...
Probing Structures of Distant Extrasolar Planets with Microlensing (2002)
Gaudi, B. Scott, Chang, Heon-Young, Han, Cheongho
Planetary companions to the source stars of a caustic-crossing binary microlensing events can be detected via the deviation from the parent light curves created when the caustic magnifies the star...
Burke, Christopher J., DePoy, D. L., Gaudi, B. Scott, Marshall, J. L., Pogge, Richard W.
We present first results from the Survey for Transiting Extrasolar Planets in Stellar Systems (STEPSS). Our goal is to assess the frequency of close-in extrasolar planets around main-sequence stars...
Angular Radii of Stars via Microlensing (2002)
Gaudi, B. Scott, Graff, David S., Han, Cheongho
We outline a method by which the angular radii of giant and main sequence stars in the Galactic bulge can be measured to a few percent accuracy. The method combines ground-based photometry of...
Microlensing Searches for Extrasolar Planets: Current Status and Future Prospects (2002)
I review results from, and future prospects for, microlensing searches for extrasolar planets. Analyses of well-sampled microlensing light curves by several collaborations have demonstrated that...
Microlensing Constraints on Low-Mass Companions (2002)
Microlensing is sensitive to binary, brown dwarf, and planetary companions to normal stars in the Galactic bulge with separations between about 1-10 AU. The accurate, densely-sampled photometry of...
Gravitational Microlensing Near Caustics II: Cusps (2002)
Gaudi, B. Scott, Petters, A. O.
We present a rigorous, detailed study of the generic, quantitative properties of gravitational microlensing near cusp catastrophes. We derive explicit formulas for the total magnification and...
Gravitational Microlensing Near Caustics I: Folds (2001)
Gaudi, B. Scott, Petters, A. O.
We study the local behavior of gravitational lensing near fold catastrophes. Using a generic form for the lensing map near a fold, we determine the observable properties of the lensed images,...
Interpreting the M22 Spike Events (2001)
Recently Sahu et al., using the Hubble Space Telescope to monitor stars in the direction of the old globular cluster M22, detected six events in which otherwise constant stars brightened by ~50%...
Microlensing and the Surface Brightness Profile of the Afterglow Image of GRB 000301C (2001)
Gaudi, B. Scott, Granot, Jonathan, Loeb, Abraham
The optical afterglow of Gamma-Ray Burst (GRB) 000301C exhibited a significant, short-timescale deviation from the power-law flux decline expected in the standard synchrotron shock model. Garnavich,...
Center of Light Curves for Whitney Fold and Cusp (2001)
Gaudi, B. Scott, Petters, A. O.
The generic, qualitative, local behavior of center-of-light curves near folds and cusps are studied. The results apply to any finite number of lens planes.
Resolving the Image of Gamma-Ray Burst Afterglows with Gravitational Microlensing (2001)
Gaudi, B. Scott, Loeb, Abraham
Microlensing of a gamma-ray burst afterglow by an intervening star can be used to infer the radial structure of the afterglow image. Near the peak of the microlensing event, the outer edge of the...
Planetary Transits Toward the Galactic Bulge (2000)
The primary difficulty with using transits to discover extrasolar planets is the low probability a planet has of transiting its parent star. One way of overcoming this difficulty is to search for...
Microlensing Constraints on the Frequency of Jupiter Mass Planets (2000)
Gaudi, B. Scott, Albrow, M. D., An, Jin H., Caldwell, J. A. R., Depoy, D. L., ...
Microlensing is the only technique likely, within the next 5 years, to constrain the frequency of Jupiter-analogs. The PLANET collaboration has monitored nearly 100 microlensing events of which more...
Graff, David S., Gaudi, B. Scott
We propose a direct method to detect close-in giant planets orbiting stars in the Galactic bulge. This method uses caustic-crossing binary microlensing events discovered by survey teams monitoring...
Detection Efficiencies of Microlensing Datasets to Stellar and Planetary Companions (1999)
Gaudi, B. Scott, Sackett, Penny D.
Microlensing light curves are now being monitored with the precision required to detect small perturbations due to planetary companions of the primary lens. Microlensing is complementary to other...
Microlensing by Multiple Planets in High Magnification Events (1998)
Gaudi, B. Scott, Naber, Richard M., Sackett, Penny D.
Microlensing is increasingly gaining recognition as a powerful method for the detection and characterization of extra-solar planetary systems. Naively, one might expect that the probability of...
Spectrophotometric Resolution of Stellar Atmospheres with Microlensing (1998)
Gaudi, B. Scott, Gould, Andrew
Microlensing is a powerful tool for studying stellar atmospheres because as the source crosses regions of formally infinite magnification (caustics) the surfaceof the star is resolved, thereby...
Planetary Microlensing Perturbations: True Planets or Binary Sources? (1997)
A planetary microlensing event is characterized by a short-lived perturbation to the standard Paczy\'nski curve. Planetary perturbations typically last from a few hours to a day, and have maximum...
Planet Parameters in Microlensing Events (1996)
Gaudi, B. Scott, Gould, Andrew
A planetary microlensing event occurs when a planet perturbs one of the two images created in a point-mass microlensing event, causing a deviation from the standard Paczy\'nski curve. Determination...
Detection Rates for Close Binaries Via Microlensing (1996)
Gaudi, B. Scott, Gould, Andrew
Microlensing is one of the most promising methods of reconstructing the stellar mass function down to masses even below the hydrogen-burning limit. The fundamental limit to this technique is the...
Femtolens Imaging of a Quasar Central Engine Using a Dwarf Star Telescope (1996)
Gould, Andrew, Gaudi, B. Scott
We show that it is possible to image the structure of a distant quasar on scales of $\sim 1\,$AU by constructing a telescope which uses a nearby dwarf star as its ``primary lens'' together with a...
Satellite Parallaxes of Lensing Events Towards the Galactic Bulge (1996)
Gaudi, B. Scott, Gould, Andrew
In order to understand the nature of the lenses that generate microlensing events, one would like to measure their mass, distance, and velocity. Unfortunately, current microlensing experiments...