Results 31 to 40 of about 2,208 (72)

WFIRST Ultra-Precise Astrometry II: Asteroseismology [PDF]

, 2014
WFIRST microlensing observations will return high-precision parallaxes, sigma(pi) < 0.3 microarcsec, for the roughly 1 million stars with ...
Gould, A., Huber, D., Penny, M., Stello, D.   +3 more
core   +3 more sources

Primordial Black Hole Dark Matter Simulations Using PopSyCLE

The Astrophysical Journal
Primordial black holes (PBHs), theorized to have originated in the early Universe, are speculated to be a viable form of dark matter. If they exist, they should be detectable through photometric and astrometric signals resulting from gravitational ...
Kerianne Pruett, William Dawson, Michael S. Medford, Jessica R. Lu, Casey Lam, Scott Perkins, Peter McGill, Nathan Golovich, George Chapline   +8 more
doaj   +1 more source

A new probe of the small-scale primordial power spectrum: astrometric microlensing by ultracompact minihalos [PDF]

, 2012
The dark matter enclosed in a density perturbation with a large initial amplitude (delta-rho/rho > 1e-3) collapses shortly after recombination and forms an ultracompact minihalo (UCMH).
Erickcek, Adrienne L., Law, Nicholas M., Li, Fangda   +2 more
core   +3 more sources

Prediction of Astrometric and Timing Microlensing Events with Pulsars by ATNF Catalog and Gaia DR3

The Astrophysical Journal
Determining the mass of neutron stars is crucial for understanding their formation, evolution, and interior structure. Currently, only a few dozen neutron stars have had their masses measured, and most of them belong to binary systems. However, there are
Xu Lu, Yi Xie
doaj   +1 more source

Ongoing Astrometric Microlensing Events of Two Nearby Stars

, 2018
Context. Astrometric microlensing is an excellent tool to determine the mass of a stellar object. By measuring the astrometric shift of a background source star in combination with precise predictions of its unlensed position and of the lens position ...
Bastian, U., Demleitner, M., Klüter, J., Wambsganss, J.   +3 more
core   +1 more source

OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion? [PDF]

, 2009
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.
Abe, F., Albrow, M. D., Anderson, Jay, Beaulieu, J. P., Bennett, D. P., Bode, M., Bond, I. A., Bramich, D. M., Brillant, S., Britton, T. R., Burgdorf, M., Calitz, H., Cassan, A., Christie, G. W., Cook, K. H., Coutures, Ch., DePoy, D. L., Dieters, S., Donatowicz, J., Dong, Subo, Doublier, Vanessa, Foellmi, Cedric, Fouqué, P., Fox, D. B., Gal-Yam, A., Gaudi, B. S., Gilmore, A. C., Gould, Andrew, Greenhill, J., Han, C., Hearnshaw, J. B., Hill, K., Hoffman, M., Horne, K., Itow, Y., Jaroszyński, M., Jørgensen, U. G., Kamiya, K., Kane, S., Kilmartin, P. M., Korpela, A., Kubas, D., Kubiak, M., Lépine, S., Marquette, J. B., Martin, Roland, Masuda, K., Matsubara, Y., McCormick, J., Meintjes, P., Menzies, J., Motomura, M., Muraki, Y., Nakamura, S., Ofek, E., Ohnishi, K., Okada, C., Park, B.-G., Pietrzyński, G., Pogge, R. W., Pollard, K. R., Prester, D. Dominis, Rattenbury, N., Sahu, K. C., Saito, To., Sako, T., Sasaki, M., Snodgrass, C., Soszyński, I., Steele, I., Sullivan, D., Sumi, T., Szewczyk, O., Szymański, M. K., The MOA Collaboration,, The OGLE Collaboration,, The PLANET/Robo Net Collaborations,, The ΜFUN Collaboration,, Tristram, P. J., Udalski, Andrzej, Ulaczyk, K., Vinter, C., Wambsganss, J., Williams, A., Wyrzykowski, Ł., Yanagisawa, T., Yock, P. C. M., Yoshoika, T.   +87 more
core   +5 more sources

Astrometric Microlensing Constraints on a Massive Body in the Outer Solar System with Gaia

, 2005
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 ellipse will deflect the angular position of background
B. Scott Gaudi, Brown M. E., Hog E., Joshua S. Bloom, Oort J. H.   +4 more
core   +2 more sources

Microlensing Searches for Exoplanets

, 2018
Gravitational microlensing finds planets through their gravitational influence on the light coming from a more distant background star. The presence of the planet is then inferred from the tell-tale brightness variations of the background star during the
Tsapras, Yiannis
core   +1 more source

An Additional Application of the Space Interferometry Mission to Gravitational Microlensing Experiments

, 1999
Despite the detection of a large number of gravitational microlensing events, the nature of Galactic dark matter remains very uncertain. This uncertainty is due to two major reasons: the lens parameter degeneracy in the measured Einstein timescale and ...
Alard, Alard, Alard, Albrow, Alcock, Alcock, Alcock, Alcock, Allen, Ansari, Boden, Bouquet, Buchalter, Buchalter, Cheongho Han, di Stefano, Dominik, Duquennoy, Goldberg, Goldberg, Griest, Han, Han, Han, Han, Han, Han, Hecht, Holtzman, Jeong, Kamionkowski, Nemiroff, Nemiroff, Paczynski, Paczynski, Tu-Whan Kim, Udalski, Udalski, Walker, Wozniak   +39 more
core   +2 more sources

Broad spectral line and continuum variabilities in QSO spectra induced by microlensing of diffusive massive substructure

, 2013
We investigate the variability of the continuum and broad lines in QSO spectra (particularly in the H$\beta$ line and continuum at $\lambda$ 5100 \AA ) caused by microlensing of a diffuse massive structure (like an open star cluster).
Popović, Luka Č., Simić, Saša
core   +1 more source