Results 31 to 40 of about 7,742 (115)

Real-time Likelihood-free Inference of Roman Binary Microlensing Events with Amortized Neural Posterior Estimation [PDF]

Astronomical Journal, 2021
Fast and automated inference of binary-lens, single-source (2L1S) microlensing events with sampling-based Bayesian algorithms (e.g., Markov Chain Monte Carlo, MCMC) is challenged on two fronts: the high computational cost of likelihood evaluations with ...
Keming 可名 Zhang 张, J. Bloom, B. Gaudi, François Lanusse, C. Lam, Jessica R. Lu   +5 more
semanticscholar   +1 more source

Possible Gravitational Microlensing Events in the Optical Lightcurve of Active Galaxy S5 0716+714

The Astrophysical Journal, 2023
A well-known active galaxy of the blazar type, S5 0716+714, is characterized by a particularly high-variability duty cycle on short timescales at optical frequencies.
D. Ł. Król, Ł. Stawarz, J. Krzesinski, C. C. Cheung   +3 more
doaj   +1 more source

Dark Matter Halos from the Inside Out

Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011
The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model.
James E. Taylor, Rob Ivison
wiley   +1 more source

Automated Detection of Short Optical Transients of Astrophysical Origin in Real Time

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
The detection of short optical transients of astrophysical origin in real time is an important task for existing robotic telescopes. The faster a new optical transient is detected, the earlier follow‐up observations can be started. The sooner the object is identified, the more data can be collected before the source fades away, particularly in the most
Marcin Sokołowski, Katarzyna Małek, Lech W. Piotrowski, Grzegorz Wrochna, Taro Kotani   +4 more
wiley   +1 more source

OGLE-2023-BLG-0836L: The sixth microlensing planet in a binary stellar system [PDF]

Astronomy & Astrophysics
Light curves of microlensing events occasionally deviate from the smooth and symmetric form of a single-lens single-source event. While most of these anomalous events can be accounted for by employing a binary-lens single-source (2L1S) or a single-lens ...
C. Han, A. Udalski, Y. Jung, A. Gould, Doeon Kim, M. Albrow, S. Chung, K. Hwang, Chung-Uk Lee, Y. Ryu, Y. Shvartzvald, I. Shin, J. Yee, Hongjing Yang, W. Zang, S. Cha, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, B.-G. Park, R. Pogge, P. Mr'oz, M. Mr'oz, M. Szyma'nski, J. Skowron, R. Poleski, I. Soszy'nski, P. Pietrukowicz, S. Kozłowski, K. Rybicki, P. Iwanek, K. Ulaczyk, M. Wrona, M. Gromadzki   +34 more
semanticscholar   +1 more source

Frequency shift in binary microlensing [PDF]

Monthly notices of the Royal Astronomical Society
Gravitational microlensing with binary lensing is one of the channels for detecting exoplanets. Due to the degeneracy of the lens parameters for the binary microlensing, additional features such as parallax and finite-size effects need to identify the ...
S. Sarbaz, S. Rahvar
semanticscholar   +1 more source

Gaia21blx: Complete resolution of a binary microlensing event in the Galactic disk [PDF]

Astronomy & Astrophysics
Gravitational microlensing is a method that is used to discover planet-hosting systems at distances of several kiloparsec in the Galactic disk and bulge.
P. Rota, V. Bozza, M. Hundertmark, É. Bachelet, R. Street, Y. Tsapras, A. Cassan, M. Dominik, R. Jaimes, K. Rybicki, J. Wambsganss, Ł. Wyrzykowski, P. Zieli´nski, The Omega Key, M. Bonavita, T. Hinse, U. Jørgensen, E. Khalouei, H. Korhonen, P. Longa-Peña, N. Peixinho, S. Rahvar, S. Sajadian, J. Skottfelt, C. Snodgrass, J. Tregolan-Reed, The MiNDSTEp   +26 more
semanticscholar   +1 more source

First Assessment of the Binary Lens OGLE-2015-BLG-0232 [PDF]

Astrophysical Journal, 2018
We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the ...
É. Bachelet, V. Bozza, C. Han, A. Udalski, I. Bond, J. Beaulieu, J. Beaulieu, R. Street, Hyosun Kim, D. Bramich, A. Cassan, M. Dominik, R. Jaimes, R. Jaimes, R. Jaimes, K. Horne, M. Hundertmark, M. Hundertmark, S. Mao, J. Menzies, C. Ranc, R. Schmidt, C. Snodgrass, I. Steele, Y. Tsapras, J. Wambsganss, P. Mróz, I. Soszyński, M. Szymański, J. Skowron, P. Pietrukowicz, S. Kozłowski, R. Poleski, K. Ulaczyk, M. Pawlak, F. Abe, R. Barry, D. Bennett, D. Bennett, A. Bhattacharya, A. Bhattacharya, M. Donachie, A. Fukui, A. Fukui, Y. Hirao, Y. Itow, K. Kawasaki, I. Kondo, N. Koshimoto, M. Li, Y. Matsubara, Y. Muraki, Sei Miyazaki, M. Nagakane, N. Rattenbury, H. Suematsu, D. Sullivan, T. Sumi, D. Suzuki, P. Tristram, A. Yonehara   +60 more
semanticscholar   +1 more source

Detection of exoplanet as a binary source of microlensing events in WFIRST survey [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We investigate the possibility of exoplanet detection orbiting source stars in microlensing events through WFIRST observations. We perform a Monte Carlo simulation on the detection rate of exoplanets via microlensing, assuming that each source star has
F. Bagheri, S. Sajadian, S. Rahvar
semanticscholar   +1 more source

OGLE-2018-BLG-1700L: Microlensing Planet in Binary Stellar System [PDF]

Astronomical Journal, 2019
We report a planet in a binary that was discovered from the analysis of the microlensing event OGLE-2018-BLG-1700. We identify the triple nature of the lens from the fact that the anomaly pattern can be decomposed into two parts produced by two binary ...
C. Han, Chung-Uk Lee, A. Udalski, A. Gould, I. Bond, M. Albrow, S. Chung, K. Hwang, Y. Jung, Y. Ryu, I. Shin, Y. Shvartzvald, J. Yee, W. Zang, S. Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, B.-G. Park, R. Pogge, M. J. Jee, Doeon Kim, P. Mróz, M. Szymański, J. Skowron, R. Poleski, I. Soszyński, P. Pietrukowicz, S. Kozłowski, K. Ulaczyk, K. Rybicki, P. Iwanek, M. Wrona, F. Abe, R. Barry, D. Bennett, A. Bhattacharya, M. Donachie, H. Fujii, A. Fukui, Y. Itow, Y. Hirao, Y. Kamei, I. Kondo, N. Koshimoto, M. Cheung Alex Li, Y. Matsubara, Y. Muraki, S. Miyazaki, M. Nagakane, C. Ranc, N. Rattenbury, H. Suematsu, D. Sullivan, T. Sumi, D. Suzuki, P. Tristram, T. Yamakawa, A. Yonehara   +60 more
semanticscholar   +1 more source