940 citations · 3.3k across the 75 of their papers we have counts for
10 papers · 1 filter
Testing Bimodal Planet Formation
Dale L. Fields, Andrew Gould
We suggest that the observed break in giant-planet frequency as a function of host metallicity at Z=0.02 may be a reflection of bimodal planet formation. We search for signatures o…
Resolution of the MACHO-LMC-5 Puzzle: The Jerk-Parallax Microlens Degeneracy
Andrew Gould
By extending the constant-acceleration analysis of Smith, Mao, & Paczynski to include jerk, I show that microlens parallax measurements are subject to a four-fold discrete degenera…
chi^2 and Linear Fits
Andrew Gould
The mathematics of linear fits is presented in covariant form. Topics include: correlated data, covariance matrices, joint fits to multiple data sets, constraints, and extension of…
New Hipparcos-based Parallaxes for 424 Dim Stars
Andrew Gould, Julio Chaname
We present a catalog of 424 common proper motion companions to Hipparcos stars with good (>3 sigma) parallaxes, thereby effectively providing new parallaxes for these companions. C…
The End of the MACHO Era: Limits on Halo Dark Matter from Stellar Halo Wide Binaries
Jaiyul Yoo, Julio Chaname, Andrew Gould
We simulate the evolution of halo wide binaries in the presence of MAssive Compact Halo Objects (MACHOs) and compare our results to the sample of wide binaries of Chaname & Gould (…
Disk and Halo Wide Binaries from the Revised Luyten Catalog: Probes of Star Formation and MACHO Dark Matter
Julio Chaname, Andrew Gould
We present a catalog of 1147 candidate common proper motion binaries selected from the revised New Luyten Two-Tenths Catalog. Among these, we identify 999 genuine physical pairs us…
Resolving the Microlens Mass Degeneracy for Earth-Mass Planets
Andrew Gould, B. Scott Gaudi, Cheongho Han
Of all planet-finding techniques, microlensing is potentially the most sensitive to Earth-mass planets. However, microlensing lightcurves generically yield only the planet-star mas…
An Upper Limit on the Granularity of the Local Stellar Halo
Andrew Gould
I use the statistical properties of 4588 nearby halo stars to show that if the local stellar halo is composed of cold streams from disrupted dwarf satellites as is predicted by pop…
Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
Cheongho Han, Andrew Gould
We estimate the optical depth to self-lensing by stars in the Galactic bulge using the HST star counts of Holtzman et al and Zoccali et al as extrapolated by Gould into the brown-d…
Sgr A* Companion S0-2: A Probe of Very High-Mass Star Formation
Andrew Gould, Alice C. Quillen
The star S0-2, which is orbiting Sgr A* with a 15-yr period, almost certainly did not form in situ. We propose that it was injected into this close orbit by the tidal disruption of…