Results 61 to 70 of about 3,374 (103)

The Brown-dwarf Desert Persists as a Mass-ratio Desert around Low-mass Stars

The Astrophysical Journal Letters
Sun-like stars are known to host a paucity of brown-dwarf companions at close separations. Direct imaging surveys of intermediate-mass stars have suggested that the brown-dwarf desert may be fundamentally a feature in the mass ratio. Microlensing surveys
Keming Zhang
doaj   +1 more source

OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant

The Astronomical Journal
We present the analysis of the microlensing event OGLE-2014-BLG-0221, a planetary candidate event discovered in 2014. The photometric light curve is best described by a binary-lens single-source model. Our light-curve modeling finds two degenerate models,
Rintaro Kirikawa, Takahiro Sumi, David P. Bennett, Daisuke Suzuki, Naoki Koshimoto, Shota Miyazaki, Ian A. Bond, Andrzej Udalski, Nicholas J. Rattenbury, Leading Authors, Fumio Abe, Richard Barry, Aparna Bhattacharya, Hirosane Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Yutaka Matsubara, Yasushi Muraki, Greg Olmschenk, Clément Ranc, Yuki K. Satoh, Mio Tomoyoshi, Paul . J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, MOA COLLABORATION, Przemek Mróz, Radosław Poleski, Jan Skowron, Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Mateusz J. Mróz, OGLE COLLABORATION   +39 more
doaj   +1 more source

OGLE-2011-BLG-0462: An Isolated Stellar-mass Black Hole Confirmed Using New HST Astrometry and Updated Photometry

The Astrophysical Journal
The long-duration Galactic-bulge microlensing event OGLE-2011-BLG-0462 produced relativistic astrometric deflections of the source star, which we measured using Hubble Space Telescope (HST) observations taken at eight epochs over ∼6 yr.
Kailash C. Sahu, Jay Anderson, Stefano Casertano, Howard E. Bond, Martin Dominik, Annalisa Calamida, Andrea Bellini, Thomas M. Brown, Henry C. Ferguson, Marina Rejkuba   +9 more
doaj   +1 more source

Fast Radio Bursts by Stellar Wind Microlensing of a Faint Background Source

The Astrophysical Journal
By assuming the inverse square law of solar wind plasma density as representative of other stars, it is shown that just outside a star, the outward deflection of a passing radio signal at ν  ≈ 1 GHz (which is capable of penetrating the plasma) is about 5
Richard Lieu
doaj   +1 more source

Gaia20fnr: A binary-lens microlensing event with full orbital motion revealed by four space telescopes

22 pages, 11 figures, submitted to A&A on 22.01 ...
Wicker, M., Wyrzykowski, Ł., Hundertmark, M., Rybicki, K. A., Zieliński, P., Stonkutė, E., Ihanec, N., Maskoliūnas, M., Bachelet, E., Kruszyńska, K., Dominik, M., Buckley, D. A. H., Gezer, I., Gromadzki, M., Mikołajczyk, P., Kotysz, K., Majumdar, J., Pakštienė, E., Zdanavičius, J., Čepas, V., Jonauskaitė, U., Bozza, V., Cassan, A., Jaimes, R. Figuera, Rabus, M., Rota, P., Street, R. A., Tsapras, Y., Wambsganss, J., Awiphan, S., Brincat, S. M., Budzik, Z., Davidson Jr., J. W., Dymock, R., Galdies, C., Godunova, V., Hambsch, F. -J., Jabłonska, M., Kvernadze, T., Larma, M., Makowska, M., Markus, Y., Merc, J., Michniewicz, O., Motylinski, M., Popowicz, A., Radziwonowicz, M., Reichart, D., Simon, A. O., Trzcionkowski, P., Zejmo, M., Zola, S.   +51 more
openaire   +2 more sources

Can gravitational waves be detected in quasar microlensing? [PDF]

, 2000
Studies of the lensed quasar ${\rm Q}0957+561 {\rm A,B}$ have shown evidence for microlensing in the brightness history of the quasar images. It had been suggested that a frequency offset between the brightness fluctuations in each of the two images ...
Larson, Shane L., Schild, Rudolph
core   +1 more source

Subaru Telescope -History, active/adaptive optics, instruments, and scientific achievements. [PDF]

Proc Jpn Acad Ser B Phys Biol Sci, 2021
Iye M.
europepmc   +1 more source

Recent advances in infrared imagers: toward thermodynamic and quantum limits of photon sensitivity. [PDF]

Rep Prog Phys, 2020
Bianconi S, Mohseni H.
europepmc   +1 more source

Primordial black holes and the origin of the matter-antimatter asymmetry. [PDF]

Philos Trans A Math Phys Eng Sci, 2019
García-Bellido J.
europepmc   +1 more source

Direct test of the FLRW metric from strongly lensed gravitational wave observations. [PDF]

Sci Rep, 2019
Cao S, Qi J, Cao Z, Biesiada M, Li J, Pan Y, Zhu ZH.   +6 more
europepmc   +1 more source