تقرير
OGLE-2019-BLG-0960 Lb: the Smallest Microlensing Planet
| العنوان: | OGLE-2019-BLG-0960 Lb: the Smallest Microlensing Planet |
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| المؤلفون: | Jennifer C. Yee, Weicheng Zang, Andrzej Udalski, Yoon-Hyun Ryu, Jonathan Green, Steve Hennerley, Andrew Marmont, Takahiro Sumi, Shude Mao, Mariusz Gromadzki, Przemek Mróz, Jan Skowron, Radoslaw Poleski, Michał Krzysztof Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, Hyoun Woo Kim, In-Gu Shin, Yossi Shvartzvald, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard Barry, David P. Bennett, Aparna Bhattacharya, Stela Ishitani Silva, Gregory Olmschenk, Clément Ranc |
| المصدر: | The Astronomical Journal. 162(5) |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Astrophysics, Astronomy |
| الوصف: | We report the analysis of OGLE-2019-BLG-0960, which contains the smallest mass-ratio microlensing planet found to date (q = 1.2–1.6 × 10^(−5) at 1σ). Although there is substantial uncertainty in the satellite parallax measured by Spitzer, the measurement of the annual parallax effect combined with the finite source effect allows us to determine the mass of the host star (M(L) = 0.3–0.6 Mꙩ), the mass of its planet (m(p) = 1.4–3.1 Mꚛ), the projected separation between the host and planet (a(⊥) = 1.2–2.3 au), and the distance to the lens system (D(L) = 0.6–1.2 kpc). The lens is plausibly the blend, which could be checked with adaptive optics observations. As the smallest planet clearly below the break in the mass-ratio function, it demonstrates that current experiments are powerful enough to robustly measure the slope of the mass-ratio function below that break. We find that the cross-section for detecting small planets is maximized for planets with separations just outside of the boundary for resonant caustics and that sensitivity to such planets can be maximized by intensively monitoring events whenever they are magnified by a factor A > 5. Finally, an empirical investigation demonstrates that most planets showing a degeneracy between (s > 1) and (s < 1) solutions are not in the regime (|log s| ≫ 0) for which the "close"/"wide" degeneracy was derived. This investigation suggests that there is a link between the "close"/"wide" and "inner/outer" degeneracies and also that the symmetry in the lens equation goes much deeper than symmetries uncovered for the limiting cases. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1538-3881 0004-6256 |
| DOI: | 10.3847/1538-3881/ac1582 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20220002210 |
| ملاحظات: | 399131 80GSFC21M0002 80HQTR21CA005 80GSFC17M0002 JPL 1571564 NSFC 11821303 NSFC 11761131004 MAESTRO 2014/14/A/ST9/00121 JSPS KAKENHI JSPS24253004 JSPS KAKENHI JSPS26247023 JSPS KAKENHI JSPS23340064 JSPS KAKENHI JSPS15H00781 JSPS KAKENHI JP16H06287 JSPS KAKENHI JP17H02871 AST-1516842 JPL 1500811 ERC Agreement No. [321035] NRFK 2019R1A2C2085965 NRFK 2020R1A4A2002885 DFG WA 1047/11-1 La Silla Paranal Observatory ID 179.B-2002 |
| رقم الأكسشن: | edsnas.20220002210 |
| قاعدة البيانات: | NASA Technical Reports |
| تدمد: | 15383881 00046256 |
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| DOI: | 10.3847/1538-3881/ac1582 |