Results 11 to 20 of about 135 (115)

OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source? [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
(abridged) Using the particularly long gravitational microlensing event OGLE-2014-BLG-1186 with a time-scale $t_\mathrm{E}$ ~ 300 d, we present a methodology for identifying the nature of localised deviations from single-lens point-source light curves, which ensures that 1) the claimed signal is substantially above the noise floor, 2) the inferred ...
Rachel Street, Przemek Mroz, Noe Kains   +2 more
exaly   +15 more sources

Three Binary-source Binary-lens Microlensing Events from the 2024 Microlensing Campaign

Publications of the Astronomical Society of the Pacific
Abstract We investigated microlensing events detected by the Optical Gravitational Lensing Experiment (OGLE) and Korea Microlensing Telescope Network surveys during the 2024 observing season, focusing on those that exhibit very complex anomaly features.
Cheongho Han, Chung-Uk Lee, Andrzej Udalski, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Youn Kil Jung, Kyu- Ha Hwang, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Weicheng Zang, Hongjing Yang, Doeon Kim, Dong-Jin Kim, Byeong-Gon Park, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radosław Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof A. Rybicki, Patryk Iwanek, Krzysztof Ulaczyk, Marcin Wrona, Mariusz Gromadzki, Mateusz J. Mróz   +29 more
exaly   +3 more sources

Binary Source Microlensing Event OGLE-2016-BLG-0733: Interpretation of a Long-term Asymmetric Perturbation [PDF]

Astronomical Journal, 2017
Abstract In the process of analyzing an observed light curve, one often confronts various scenarios that can mimic the planetary signals causing difficulties in the accurate interpretation of the lens system. In this paper, we present the analysis of the microlensing event OGLE-2016-BLG-0733.
Nicholas Rattenbury, Przemek Mroz, Michał Krzysztof Szymański   +2 more
exaly   +4 more sources

Assessing the Impact of Binary Systems on Microlensing Using SPISEA and PopSyCLE Population Simulations

The Astrophysical Journal
Gravitational microlensing provides a unique opportunity to probe the mass distribution of stars, black holes, and other objects in the Milky Way. Population simulations are necessary to interpret results from microlensing surveys.
Natasha S. Abrams, Jessica R. Lu, Casey Y. Lam, Michael S. Medford, Matthew W. Hosek Jr., Sam Rose   +5 more
doaj   +2 more sources

Astrometric Method for Breaking the Photometric Degeneracy between Binary‐Source and Planetary Microlensing Perturbations

Astrophysical Journal, 2002
An extra-solar planet can be detected by microlensing because the planet can perturb the smooth lensing light curve created by the primary lens. However, it was shown by Gaudi that a subset of binary-source events can produce light curves that closely resemble those produced by a significant fraction of planet/star lens systems, causing serious ...
exaly   +3 more sources

Single Photon Kilohertz Frame Rate Imaging of Neural Activity. [PDF]

Adv Sci (Weinh), 2022
The high temporal precision of single photon avalanche diodes (SPADs) is leveraged to record neural activity reported by genetically encoded voltage indicators. Subthreshold and spiking activity of single neurons is resolved with shot noise limited signals at frame rates of up to 10 kHz.
Tian T, Yuan Y, Mitra S, Gyongy I, Nolan MF.   +4 more
europepmc   +2 more sources

A Differentiable Binary Microlensing Model Using Adaptive Contour Integration Method

The Astronomical Journal
We present microlux , which is a Jax -based code that can compute the binary microlensing light curve and its derivatives both efficiently and accurately.
Haibin Ren, Wei Zhu
doaj   +2 more sources

Characteristic Features of Gravitational Wave Lensing as Probe of Lens Mass Model

Annalen der Physik, Volume 535, Issue 6, June 2023., 2023
The gravitational lensing of gravitational waves is an expanding field in astronomy and cosmology. It might contribute to solving many different issue in these fields. To exploit its potential, first of all, one needs to recognize and model a gravitational wave event properly.
Paolo Cremonese, David Fonseca Mota, Vincenzo Salzano   +2 more
wiley   +1 more source

The road toward imaging a black hole: A personal perspective

Natural Sciences, Volume 2, Issue 4, October 2022., 2022
The article describes the authors personal journey towards developig the Event Horizon Telescope and the first image of a black hole. Left: predcition made by the author and collaborators proposing the black hole imaging in 2000. Right: the two images observed and published by the Event Horizon Telescope in 2019 and 2022.
Heino Falcke
wiley   +1 more source

Identifying interesting planetary systems for future X‐ray observations

Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022
Abstract X‐ray observations of star–planet systems are important to grow our understanding of exoplanets; these observations allow for studies of photoevaporation of the exoplanetary atmosphere, and in some cases even estimations of the size of the outer planetary atmosphere.
Grace Foster, Katja Poppenhaeger
wiley   +1 more source