OGLE-2017-BLG-0373Lb: A Jovian Mass-Ratio Planet Exposes A New Accidental Microlensing Degeneracy

• Autorzy: Skowron J. , Ryu Y.-H. , Hwang K.-H. , Udalski A. , Mróz P. , Kozłowski S. , Soszyński I. , Pietrukowicz P. , Szymański M. K. , Poleski R. , Ulaczyk K. , Pawlak M. , Rybicki K. , Iwanek P. , Albrow M. D. , Chung S.-J. , Gould A. , Han C. , Jung Y. K. , Shin I.-G. , Shvartzvald Y. , Yee J. C. , Zang W. , Zhu W. , Cha S.-M. , Kim D.-J. , Kim H.-W. , Kim S.-L. , Lee C.-U. , Lee D.-J , Lee Y. , Park B.-G. , Pogge R. W.

Identyfikatory

DOI

10.32023/0001-5237/68.1.2

• Języki publikacji: EN

Abstrakty

EN

We report the discovery of microlensing planet OGLE-2017-BLG-0373Lb. We show that while the planet-host system has an unambiguous microlens topology, there are two geometries within this topology that fit the data equally well, which leads to a factor 2.5 difference in planet-host mass ratio, i.e., q=1.5×10^-3 vs. q=0.6×10^-3. We show that this is an "accidental degeneracy" in the sense that it is due to a gap in the data. We dub it "the caustic-chirality degeneracy". We trace the mathematical origins of this degeneracy, which should enable similar degenerate solutions to be easily located in the future. A Bayesian estimate, based on a Galactic model, yields a host mass M=0.25^+0.30_-0.15 M⊙ at a distance DL=5.9^+1.3_-1.95 kpc. The lens-source relative proper motion is relatively fast, μ=9 mas/yr, which implies that the host mass and distance can be determined by high-resolution imaging after about 10 years. The same observations could in principle resolve the discrete degeneracy in q, but this will be more challenging.

Słowa kluczowe

EN

gravitational lensing: micro; planetary systems

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2018
• Tom: Vol. 68, No. 1
• Strony: 43--61
• Opis fizyczny: Bibliogr. 41 poz., tab., wykr.

Twórcy

autor

Skowron J.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Ryu Y.-H.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea

autor

Hwang K.-H.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea

autor

Udalski A.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Mróz P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Kozłowski S.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Soszyński I.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Pietrukowicz P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Szymański M. K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Poleski R.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
• (OGLE Collaboration)

autor

Ulaczyk K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Pawlak M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Rybicki K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Iwanek P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• (OGLE Collaboration)

autor

Albrow M. D.

• University of Canterbury, Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
• (KMTNet Collaboration)

autor

Chung S.-J.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• Korea University of Science and Technology, Daejeon 34113, Korea
• (KMTNet Collaboration)

autor

Gould A.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
• Max-Planck-Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
• (KMTNet Collaboration)

autor

Han C.

• Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea
• (KMTNet Collaboration)

autor

Jung Y. K.

• Harvard-Smithsonian CfA, 60 Garden St., Cambridge, MA 02138, USA
• (KMTNet Collaboration)

autor

Shin I.-G.

• Harvard-Smithsonian CfA, 60 Garden St., Cambridge, MA 02138, USA
• (KMTNet Collaboration)

autor

Shvartzvald Y.

• Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA NASA Postdoctoral Program Fellow
• (KMTNet Collaboration)

autor

Yee J. C.

• Harvard-Smithsonian CfA, 60 Garden St., Cambridge, MA 02138, USA
• (KMTNet Collaboration)

autor

Zang W.

• Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, China
• Department of Physics, Zhejiang University, Hangzhou, 310058, China
• (KMTNet Collaboration)

autor

Zhu W.

• Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St George Street, Toronto, ON M5S 3H8, Canada
• (KMTNet Collaboration)

autor

Cha S.-M.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• School of Space Research, Kyung Hee University, Yongin, Kyeonggi 17104, Korea
• (KMTNet Collaboration)

autor

Kim D.-J.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• (KMTNet Collaboration)

autor

Kim H.-W.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• (KMTNet Collaboration)

autor

Kim S.-L.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• (KMTNet Collaboration)

autor

Lee C.-U.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• Korea University of Science and Technology, Daejeon 34113, Korea
• (KMTNet Collaboration)

autor

Lee D.-J

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• (KMTNet Collaboration)

autor

Lee Y.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• School of Space Research, Kyung Hee University, Yongin, Kyeonggi 17104, Korea
• (KMTNet Collaboration)

autor

Park B.-G.

• Korea Astronomy and Space Science Institute, Daejon 34055, Korea
• Korea University of Science and Technology, Daejeon 34113, Korea
• (KMTNet Collaboration)

autor

Pogge R. W.

• epartment of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
• (KMTNet Collaboration)

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).