AT 2023svr , the SIMBAD biblio

2025ApJ...980...47M - Astrophys. J., 980, 47 (2025/February-2)

Observations of Microlensed Images with Dual-field Interferometry: On-sky Demonstration and Prospects.

MROZ P., DONG S., MERAND A., SHANGGUAN J., WOILLEZ J., GOULD A., UDALSKI A., EISENHAUER F., RYU Y.-H., WU Z., LIU Z., YANG H., BOURDAROT G., DEFRERE D., DRESCHER A., FABRICIUS M., GARCIA P., GENZEL R., GILLESSEN S., HONIG S.F., KREIDBERG L., LE BOUQUIN J.-B., LUTZ D., MILLOUR F., OTT T., PAUMARD T., SAUTER J., SHIMIZU T.T., STRAUBMEIER C., SUBROWEIT M., WIDMANN F. (The GRAVITY+ Collaboration), SZYMANSKI M.K., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., POLESKI R., SKOWRON J., ULACZYK K., GROMADZKI M., RYBICKI K., IWANEK P., WRONA M., MROZ M.J. (The OGLE Collaboration), ALBROW M.D., CHUNG S.-J., HAN C., HWANG K.-H., JUNG Y.K., SHIN I.-G., SHVARTZVALD Y., YEE J.C., ZANG W., CHA S.-M., KIM D.-J., KIM S.-L., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration)

Abstract (from CDS):

Interferometric observations of gravitational microlensing events offer an opportunity for precise, efficient, and direct mass and distance measurements of lensing objects, especially those of isolated neutron stars and black holes. However, such observations have previously been possible for only a handful of extremely bright events. The recent development of a dual-field interferometer, GRAVITY Wide, has made it possible to reach out to significantly fainter objects and increase the pool of microlensing events amenable to interferometric observations by 2 orders of magnitude. Here, we present the first successful observation of a microlensing event with GRAVITY Wide and the resolution of microlensed images in the event OGLE-2023-BLG-0061/KMT-2023-BLG-0496. We measure the angular Einstein radius of the lens with subpercent precision, θE = 1.280 ± 0.009 mas. Combined with the microlensing parallax detected from the event light curve, the mass and distance to the lens are found to be 0.472 ± 0.012 M⊙ and 1.81 ± 0.05 kpc, respectively. We present the procedure for the selection of targets for interferometric observations and discuss possible systematic effects affecting GRAVITY Wide data. This detection demonstrates the capabilities of the new instrument, and it opens up completely new possibilities for the follow-up of microlensing events and future routine discoveries of isolated neutron stars and black holes.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gravitational microlensing - Optical interferometry

Simbad objects: 7

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