A Candidate High-velocity Exoplanet System in the Galactic Bulge
We present an analysis of adaptive optics images from the Keck I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. reports two possibilities for the lens system: a nearby gas giant lens with an exomoon companion or a very low-mass star with a planet...
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IOP Publishing
2025-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/ad9b0f |
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| author | Sean K. Terry Jean-Philippe Beaulieu David P. Bennett Aparna Bhattacharya Jon Hulberg Macy J. Huston Naoki Koshimoto Joshua W. Blackman Ian A. Bond Andrew A. Cole Jessica R. Lu Clément Ranc Natalia E. Rektsini Aikaterini Vandorou |
| author_facet | Sean K. Terry Jean-Philippe Beaulieu David P. Bennett Aparna Bhattacharya Jon Hulberg Macy J. Huston Naoki Koshimoto Joshua W. Blackman Ian A. Bond Andrew A. Cole Jessica R. Lu Clément Ranc Natalia E. Rektsini Aikaterini Vandorou |
| author_sort | Sean K. Terry |
| collection | DOAJ |
| description | We present an analysis of adaptive optics images from the Keck I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. reports two possibilities for the lens system: a nearby gas giant lens with an exomoon companion or a very low-mass star with a planetary companion in the Galactic bulge. The ∼10 yr baseline between the microlensing event and the Keck follow-up observations allows us to detect the faint candidate lens host (star) at K = 22.3 mag and confirm the distant lens system interpretation. The combination of the host star brightness and light curve parameters yields host star and planet masses of M _host = 0.19 ± 0.03 M _⊙ and m _p = 28.92 ± 4.75 M _⊕ at a distance of D _L = 7.49 ± 0.91 kpc. We perform a multiepoch cross reference to Gaia Data Release 3 and measure a transverse velocity for the candidate lens system of v _L = 541.31 ± 65.75 km s ^−1 . We conclude this event consists of the highest-velocity exoplanet system detected to date, and also the lowest-mass microlensing host star with a confirmed mass measurement. The high-velocity nature of the lens system can be definitively confirmed with an additional epoch of high-resolution imaging at any time now. The methods outlined in this work demonstrate that the Roman Galactic Exoplanet Survey will be able to securely measure low-mass host stars in the bulge. |
| format | Article |
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| institution | Kabale University |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj-art-f390d01fd005452abf6be936feaf1cbe2025-02-10T15:21:26ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01169313110.3847/1538-3881/ad9b0fA Candidate High-velocity Exoplanet System in the Galactic BulgeSean K. Terry0https://orcid.org/0000-0002-5029-3257Jean-Philippe Beaulieu1https://orcid.org/0000-0003-0014-3354David P. Bennett2https://orcid.org/0000-0001-8043-8413Aparna Bhattacharya3Jon Hulberg4https://orcid.org/0000-0002-7423-8615Macy J. Huston5https://orcid.org/0000-0003-4591-3201Naoki Koshimoto6https://orcid.org/0000-0003-2302-9562Joshua W. Blackman7https://orcid.org/0000-0001-5860-1157Ian A. Bond8https://orcid.org/0000-0002-8131-8891Andrew A. Cole9https://orcid.org/0000-0003-0303-3855Jessica R. Lu10https://orcid.org/0000-0001-9611-0009Clément Ranc11https://orcid.org/0000-0003-2388-4534Natalia E. Rektsini12https://orcid.org/0000-0002-1530-4870Aikaterini Vandorou13https://orcid.org/0000-0002-9881-4760Department of Astronomy, University of Maryland , College Park, MD 20742, USA ; skterry@umd.edu; Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USASorbonne Université , CNRS, Institut d’Astrophysique de Paris, IAP, F-75014 Paris, France; School of Natural Sciences, University of Tasmania , Private Bag 37 Hobart, Tasmania 7001, AustraliaDepartment of Astronomy, University of Maryland , College Park, MD 20742, USA ; skterry@umd.edu; Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USADepartment of Astronomy, University of Maryland , College Park, MD 20742, USA ; skterry@umd.edu; Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USADepartment of Physics, Catholic University of America , Washington, DC 20064, USADepartment of Astronomy, University of California Berkeley , Berkeley, CA 94720, USADepartment of Earth and Space Science, Graduate School of Science, Osaka University , Osaka 560-0043, JapanPhysikalisches Institut, Universität Bern , Gesellschaftsstrasse 6, CH-3012 Bern, SwitzerlandSchool of Mathematical and Computational Sciences, Massey University , Auckland 0632, New ZealandSchool of Natural Sciences, University of Tasmania , Private Bag 37 Hobart, Tasmania 7001, AustraliaDepartment of Astronomy, University of California Berkeley , Berkeley, CA 94720, USASorbonne Université , CNRS, Institut d’Astrophysique de Paris, IAP, F-75014 Paris, FranceSorbonne Université , CNRS, Institut d’Astrophysique de Paris, IAP, F-75014 Paris, France; School of Natural Sciences, University of Tasmania , Private Bag 37 Hobart, Tasmania 7001, AustraliaDepartment of Astronomy, University of Maryland , College Park, MD 20742, USA ; skterry@umd.edu; Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USAWe present an analysis of adaptive optics images from the Keck I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. reports two possibilities for the lens system: a nearby gas giant lens with an exomoon companion or a very low-mass star with a planetary companion in the Galactic bulge. The ∼10 yr baseline between the microlensing event and the Keck follow-up observations allows us to detect the faint candidate lens host (star) at K = 22.3 mag and confirm the distant lens system interpretation. The combination of the host star brightness and light curve parameters yields host star and planet masses of M _host = 0.19 ± 0.03 M _⊙ and m _p = 28.92 ± 4.75 M _⊕ at a distance of D _L = 7.49 ± 0.91 kpc. We perform a multiepoch cross reference to Gaia Data Release 3 and measure a transverse velocity for the candidate lens system of v _L = 541.31 ± 65.75 km s ^−1 . We conclude this event consists of the highest-velocity exoplanet system detected to date, and also the lowest-mass microlensing host star with a confirmed mass measurement. The high-velocity nature of the lens system can be definitively confirmed with an additional epoch of high-resolution imaging at any time now. The methods outlined in this work demonstrate that the Roman Galactic Exoplanet Survey will be able to securely measure low-mass host stars in the bulge.https://doi.org/10.3847/1538-3881/ad9b0fExoplanetsGravitational microlensingHigh-resolution microlensing event imagingAdaptive optics |
| spellingShingle | Sean K. Terry Jean-Philippe Beaulieu David P. Bennett Aparna Bhattacharya Jon Hulberg Macy J. Huston Naoki Koshimoto Joshua W. Blackman Ian A. Bond Andrew A. Cole Jessica R. Lu Clément Ranc Natalia E. Rektsini Aikaterini Vandorou A Candidate High-velocity Exoplanet System in the Galactic Bulge The Astronomical Journal Exoplanets Gravitational microlensing High-resolution microlensing event imaging Adaptive optics |
| title | A Candidate High-velocity Exoplanet System in the Galactic Bulge |
| title_full | A Candidate High-velocity Exoplanet System in the Galactic Bulge |
| title_fullStr | A Candidate High-velocity Exoplanet System in the Galactic Bulge |
| title_full_unstemmed | A Candidate High-velocity Exoplanet System in the Galactic Bulge |
| title_short | A Candidate High-velocity Exoplanet System in the Galactic Bulge |
| title_sort | candidate high velocity exoplanet system in the galactic bulge |
| topic | Exoplanets Gravitational microlensing High-resolution microlensing event imaging Adaptive optics |
| url | https://doi.org/10.3847/1538-3881/ad9b0f |
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