OGLE-2015-BLG-0845L: A low-mass M dwarf from the microlensing parallax and xallarap effects
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arXiv
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| Natura: | Preprint |
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2024
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| author | Hu, Zhecheng Zhu, Wei Gould, Andrew Udalski, Andrzej Sumi, Takahiro Chen, Ping Novati, Sebastiano Calchi Yee, Jennifer C. Beichman, Charles A. Bryden, Geoffery Carey, Sean Fausnaugh, Michael Gaudi, B. Scott Henderson, Calen B. Shvartzvald, Yossi Wibking, Benjamin Mróz, Przemek Skowron, Jan Poleski, Radosław Szymański, Michał K. Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Ulaczyk, Krzysztof Rybicki, Krzysztof A. Iwanek, Patryk Wrona, Marcin Gromadzki, Mariusz Abe, Fumio Barry, Richard Bennett, David P. Bhattacharya, Aparna Bond, Ian A. Fujii, Hirosane Fukui, Akihiko Hamada, Ryusei Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Kirikawa, Rintaro Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Suzuki, Daisuke Tomoyoshi, Mio Tristram, Paul. J. Vandorou, Aikaterini Yama, Hibiki Yamashita, Kansuke |
| author_facet | Hu, Zhecheng Zhu, Wei Gould, Andrew Udalski, Andrzej Sumi, Takahiro Chen, Ping Novati, Sebastiano Calchi Yee, Jennifer C. Beichman, Charles A. Bryden, Geoffery Carey, Sean Fausnaugh, Michael Gaudi, B. Scott Henderson, Calen B. Shvartzvald, Yossi Wibking, Benjamin Mróz, Przemek Skowron, Jan Poleski, Radosław Szymański, Michał K. Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Ulaczyk, Krzysztof Rybicki, Krzysztof A. Iwanek, Patryk Wrona, Marcin Gromadzki, Mariusz Abe, Fumio Barry, Richard Bennett, David P. Bhattacharya, Aparna Bond, Ian A. Fujii, Hirosane Fukui, Akihiko Hamada, Ryusei Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Kirikawa, Rintaro Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Suzuki, Daisuke Tomoyoshi, Mio Tristram, Paul. J. Vandorou, Aikaterini Yama, Hibiki Yamashita, Kansuke |
| contents | We present the analysis of the microlensing event OGLE-2015-BLG-0845, which was affected by both the microlensing parallax and xallarap effects. The former was detected via the simultaneous observations from the ground and Spitzer, and the latter was caused by the orbital motion of the source star in a relatively close binary. The combination of these two effects led to a mass measurement of the lens object, revealing a low-mass ($0.14 \pm 0.05 M_{\odot}$) M-dwarf at the bulge distance ($7.6 \pm 1.0$ kpc). The source binary consists of a late F-type subgiant and a K-type dwarf of $\sim1.2 M_{\odot}$ and $\sim 0.9 M_{\odot}$, respectively, and the orbital period is $70 \pm 10$ days. OGLE-2015-BLG-0845 is the first single-lens event in which the lens mass is measured via the binarity of the source. Given the abundance of binary systems as potential microlensing sources, the xallarap effect may not be a rare phenomenon. Our work thus highlights the application of the xallarap effect in the mass determination of microlenses, and the same method can be used to identify isolated dark lenses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_13031 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | OGLE-2015-BLG-0845L: A low-mass M dwarf from the microlensing parallax and xallarap effects Hu, Zhecheng Zhu, Wei Gould, Andrew Udalski, Andrzej Sumi, Takahiro Chen, Ping Novati, Sebastiano Calchi Yee, Jennifer C. Beichman, Charles A. Bryden, Geoffery Carey, Sean Fausnaugh, Michael Gaudi, B. Scott Henderson, Calen B. Shvartzvald, Yossi Wibking, Benjamin Mróz, Przemek Skowron, Jan Poleski, Radosław Szymański, Michał K. Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Ulaczyk, Krzysztof Rybicki, Krzysztof A. Iwanek, Patryk Wrona, Marcin Gromadzki, Mariusz Abe, Fumio Barry, Richard Bennett, David P. Bhattacharya, Aparna Bond, Ian A. Fujii, Hirosane Fukui, Akihiko Hamada, Ryusei Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Kirikawa, Rintaro Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Suzuki, Daisuke Tomoyoshi, Mio Tristram, Paul. J. Vandorou, Aikaterini Yama, Hibiki Yamashita, Kansuke Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies We present the analysis of the microlensing event OGLE-2015-BLG-0845, which was affected by both the microlensing parallax and xallarap effects. The former was detected via the simultaneous observations from the ground and Spitzer, and the latter was caused by the orbital motion of the source star in a relatively close binary. The combination of these two effects led to a mass measurement of the lens object, revealing a low-mass ($0.14 \pm 0.05 M_{\odot}$) M-dwarf at the bulge distance ($7.6 \pm 1.0$ kpc). The source binary consists of a late F-type subgiant and a K-type dwarf of $\sim1.2 M_{\odot}$ and $\sim 0.9 M_{\odot}$, respectively, and the orbital period is $70 \pm 10$ days. OGLE-2015-BLG-0845 is the first single-lens event in which the lens mass is measured via the binarity of the source. Given the abundance of binary systems as potential microlensing sources, the xallarap effect may not be a rare phenomenon. Our work thus highlights the application of the xallarap effect in the mass determination of microlenses, and the same method can be used to identify isolated dark lenses. |
| title | OGLE-2015-BLG-0845L: A low-mass M dwarf from the microlensing parallax and xallarap effects |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.13031 |