A close binary lens revealed by the microlensing event Gaia20bof

2024
journal article
article
1
dc.abstract.enDuring the last 25 yr, hundreds of binary stars and planets have been discovered toward the Galactic bulge by microlensing surveys. Thanks to a new generation of large-sky surveys, it is now possible to regularly detect microlensing events across the entire sky. The OMEGA Key Projet at the Las Cumbres Observatory carries out automated follow-up observations of microlensing events alerted by these surveys with the aim of identifying and characterizing exoplanets as well as stellar remnants. In this study, we present the analysis of the binary lens event Gaia20bof. By automatically requesting additional observations, the OMEGA Key Project obtained dense time coverage of an anomaly near the peak of the event, allowing characterization of the lensing system. The observed anomaly in the lightcurve is due to a binary lens. However, several models can explain the observations. Spectroscopic observations indicate that the source is located at ≤2.0 kpc, in agreement with the parallax measurements from Gaia. While the models are currently degenerate, future observations, especially the Gaia astrometric time series as well as high-resolution imaging, will provide extra constraints to distinguish between them.
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorBachelet, E.
dc.contributor.authorRota, P.
dc.contributor.authorBozza, V.
dc.contributor.authorZieliński, P.
dc.contributor.authorTsapras, Y.
dc.contributor.authorHundertmark, M.
dc.contributor.authorWambsganss, J.
dc.contributor.authorWyrzykowski, Ł.
dc.contributor.authorMikołajczyk, P. J.
dc.contributor.authorStreet, R. A.
dc.contributor.authorJaimes, R. Figuera
dc.contributor.authorCassan, A.
dc.contributor.authorDominik, M.
dc.contributor.authorBuckley, D. A. H.
dc.contributor.authorAwiphan, S.
dc.contributor.authorNakhaharutai, N.
dc.contributor.authorZoła, Stanisław - 132934
dc.contributor.authorRybicki, K. A.
dc.contributor.authorGromadzki, M.
dc.contributor.authorHowil, K.
dc.contributor.authorIhanec, N.
dc.contributor.authorJabłońska, M.
dc.contributor.authorKruszyńska, K.
dc.contributor.authorKruszyńska, K.pl
dc.contributor.authorPylypenko, U.
dc.contributor.authorRatajczak, M.
dc.contributor.authorSitek, M.
dc.contributor.authorRabus, M.
dc.date.accessioned2025-02-05T14:28:16Z
dc.date.available2025-02-05T14:28:16Z
dc.date.createdat2025-02-05T10:34:36Zen
dc.date.issued2024
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.number1
dc.description.versionostateczna wersja wydawcy
dc.description.volume168
dc.identifier.articleid9
dc.identifier.doi10.3847/1538-3881/ad46fc
dc.identifier.eissn1538-3881
dc.identifier.issn0004-6256
dc.identifier.urihttps://ruj.uj.edu.pl/handle/item/547127
dc.languageeng
dc.language.containereng
dc.rightsUdzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa
dc.rights.licenceCC-BY
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/legalcode.pl
dc.share.typeotwarte czasopismo
dc.source.integratorfalse
dc.subject.enbinary lens microlensing
dc.subtypeArticle
dc.titleA close binary lens revealed by the microlensing event Gaia20bof
dc.title.journalAstronomical Journal
dc.typeJournalArticle
dspace.entity.typePublicationen
dc.abstract.en
During the last 25 yr, hundreds of binary stars and planets have been discovered toward the Galactic bulge by microlensing surveys. Thanks to a new generation of large-sky surveys, it is now possible to regularly detect microlensing events across the entire sky. The OMEGA Key Projet at the Las Cumbres Observatory carries out automated follow-up observations of microlensing events alerted by these surveys with the aim of identifying and characterizing exoplanets as well as stellar remnants. In this study, we present the analysis of the binary lens event Gaia20bof. By automatically requesting additional observations, the OMEGA Key Project obtained dense time coverage of an anomaly near the peak of the event, allowing characterization of the lensing system. The observed anomaly in the lightcurve is due to a binary lens. However, several models can explain the observations. Spectroscopic observations indicate that the source is located at ≤2.0 kpc, in agreement with the parallax measurements from Gaia. While the models are currently degenerate, future observations, especially the Gaia astrometric time series as well as high-resolution imaging, will provide extra constraints to distinguish between them.
dc.affiliation
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.author
Bachelet, E.
dc.contributor.author
Rota, P.
dc.contributor.author
Bozza, V.
dc.contributor.author
Zieliński, P.
dc.contributor.author
Tsapras, Y.
dc.contributor.author
Hundertmark, M.
dc.contributor.author
Wambsganss, J.
dc.contributor.author
Wyrzykowski, Ł.
dc.contributor.author
Mikołajczyk, P. J.
dc.contributor.author
Street, R. A.
dc.contributor.author
Jaimes, R. Figuera
dc.contributor.author
Cassan, A.
dc.contributor.author
Dominik, M.
dc.contributor.author
Buckley, D. A. H.
dc.contributor.author
Awiphan, S.
dc.contributor.author
Nakhaharutai, N.
dc.contributor.author
Zoła, Stanisław - 132934
dc.contributor.author
Rybicki, K. A.
dc.contributor.author
Gromadzki, M.
dc.contributor.author
Howil, K.
dc.contributor.author
Ihanec, N.
dc.contributor.author
Jabłońska, M.
dc.contributor.author
Kruszyńska, K.
dc.contributor.authorpl
Kruszyńska, K.
dc.contributor.author
Pylypenko, U.
dc.contributor.author
Ratajczak, M.
dc.contributor.author
Sitek, M.
dc.contributor.author
Rabus, M.
dc.date.accessioned
2025-02-05T14:28:16Z
dc.date.available
2025-02-05T14:28:16Z
dc.date.createdaten
2025-02-05T10:34:36Z
dc.date.issued
2024
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.number
1
dc.description.version
ostateczna wersja wydawcy
dc.description.volume
168
dc.identifier.articleid
9
dc.identifier.doi
10.3847/1538-3881/ad46fc
dc.identifier.eissn
1538-3881
dc.identifier.issn
0004-6256
dc.identifier.uri
https://ruj.uj.edu.pl/handle/item/547127
dc.language
eng
dc.language.container
eng
dc.rights
Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa
dc.rights.licence
CC-BY
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/legalcode.pl
dc.share.type
otwarte czasopismo
dc.source.integrator
false
dc.subject.en
binary lens microlensing
dc.subtype
Article
dc.title
A close binary lens revealed by the microlensing event Gaia20bof
dc.title.journal
Astronomical Journal
dc.type
JournalArticle
dspace.entity.typeen
Publication
Affiliations

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