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Gaia21blx : Complete resolution of a binary microlensing event in the Galactic disk
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dc.contributor.author | Rota, P. | |
dc.contributor.author | Bozza, V. | |
dc.contributor.author | Hundertmark, M. | |
dc.contributor.author | Bachelet, E. | |
dc.contributor.author | Street, R. | |
dc.contributor.author | Tsapras, Y. | |
dc.contributor.author | Cassan, A. | |
dc.contributor.author | Dominik, M. | |
dc.contributor.author | Figuera Jaimes, R. | |
dc.contributor.author | Rybicki, K.A. | |
dc.contributor.author | Wambsganss, J. | |
dc.contributor.author | Wyrzykowski, L. | |
dc.contributor.author | Zielinski, P. | |
dc.contributor.author | Bonavita, M. | |
dc.contributor.author | Hinse, T.C. | |
dc.contributor.author | Jorgensen, U.G. | |
dc.contributor.author | Khalouei, E. | |
dc.contributor.author | Korhonen, H. | |
dc.contributor.author | Longa-Pena, P. | |
dc.contributor.author | Peixinho, N. | |
dc.contributor.author | Rahvar, S. | |
dc.contributor.author | Sajadian, S. | |
dc.contributor.author | Skottfelt, J. | |
dc.contributor.author | Snodgrass, C. | |
dc.contributor.author | Tregolan-Reed, J. | |
dc.date.accessioned | 2024-07-16T09:30:10Z | |
dc.date.available | 2024-07-16T09:30:10Z | |
dc.date.issued | 2024-06-13 | |
dc.identifier | 301152605 | |
dc.identifier | 80ea3cc5-bde1-475e-ab3c-d84ee75663a2 | |
dc.identifier.citation | Rota , P , Bozza , V , Hundertmark , M , Bachelet , E , Street , R , Tsapras , Y , Cassan , A , Dominik , M , Figuera Jaimes , R , Rybicki , K A , Wambsganss , J , Wyrzykowski , L , Zielinski , P , Bonavita , M , Hinse , T C , Jorgensen , U G , Khalouei , E , Korhonen , H , Longa-Pena , P , Peixinho , N , Rahvar , S , Sajadian , S , Skottfelt , J , Snodgrass , C & Tregolan-Reed , J 2024 , ' Gaia21blx : Complete resolution of a binary microlensing event in the Galactic disk ' , Astronomy & Astrophysics , vol. 686 , A173 . https://doi.org/10.48550/arXiv.2404.05078 , https://doi.org/10.1051/0004-6361/202347807 | en |
dc.identifier.issn | 0004-6361 | |
dc.identifier.other | Bibtex: 2024arXiv240405078R | |
dc.identifier.uri | https://hdl.handle.net/10023/30179 | |
dc.description | This work has made use of the IAC-STAR Synthetic CMD computation code. IAC-STAR is supported and maintained by the IT department of the Instituto de Astrofísica de Canarias. EB gratefully acknowledges support from NASA grant 80NSSC19K0291. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium) and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This work makes use of observations from the Las Cumbres Observatory global telescope network. YT acknowledges the support of DFG priority program SPP 1992 “Exploring the Diversity of Extrasolar Planets” (TS 356/3-1). RFJ acknowledges support for this project provided by ANID’s Millennium Science Initiative through grant ICN12_009, awarded to the Millennium Institute of Astrophysics (MAS), and by ANID’s Basal project FB210003. This work is supported by Polish MNiSW grant DIR/WK/2018/12 and European Union’s Horizon 2020 research and innovation program under grant agreement no. 101004719 (OPTICON-RadioNet Pilot, ORP). We also acknowledge support by the italian PRIN 2022J4H55R – Detection of Earth-like ExoPlanets, CUP D53D23002590006. N.P.’s work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grants UIDB/04434/2020 and UIDP/04434/2020. We acknowledge support from the Novo Nordisk Foundation Interdisciplinary Synergy Program grant no. NNF19OC0057374. | en |
dc.description.abstract | Context. Gravitational microlensing is a method that is used to discover planet-hosting systems at distances of several kiloparsec in the Galactic disk and bulge. We present the analysis of a microlensing event reported by the Gaia photometric alert team that might have a bright lens. Aims. In order to infer the mass and distance to the lensing system, the parallax measurement at the position of Gaia21blx was used. In this particular case, the source and the lens have comparable magnitudes and we cannot attribute the parallax measured by Gaia to the lens or source alone. Methods. Since the blending flux is important, we assumed that the Gaia parallax is the flux-weighted average of the parallaxes of the lens and source. Combining this assumption with the information from the microlensing models and the finite source effects we were able to resolve all degeneracies and thus obtained the mass, distance, luminosities and projected kinematics of the binary lens and the source. Results. According to the best model, the lens is a binary system at $2.18 \pm 0.07$ kpc from Earth. It is composed of a G star with $0.95\pm 0.17\,M_{\odot}$ and a K star with $0.53 \pm 0.07 \, M_{\odot}$. The source is likely to be an F subgiant star at $2.38 \pm 1.71$ kpc with a mass of $1.10 \pm 0.18 \, M_{\odot}$. Both lenses and the source follow the kinematics of the thin-disk population. We also discuss alternative models, that are disfavored by the data or by prior expectations, however. | |
dc.format.extent | 1729217 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | en |
dc.subject | Astrophysics - solar and stellar astrophysics | en |
dc.subject | Astrophysics - astrophysics of galaxies | en |
dc.subject | Gravitation | en |
dc.subject | Gravitational lensing: micro | en |
dc.subject | Catalogs | en |
dc.subject | Parallaxes | en |
dc.subject | Proper motions | en |
dc.subject | Binaries: general | en |
dc.subject | E | en |
dc.title | Gaia21blx : Complete resolution of a binary microlensing event in the Galactic disk | en |
dc.type | Journal article | en |
dc.contributor.sponsor | European Commission | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. St Andrews Centre for Exoplanet Science | en |
dc.identifier.doi | 10.48550/arXiv.2404.05078 | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | 101004719 | en |
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