Search

Your search keyword '"I. G. Shin"' showing total 9 results
Start Over Author "I. G. Shin" Topic 01 natural sciences
9 results on '"I. G. Shin"'

1. OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing

Author

R. Figuera Jaimes, Man Cheung Alex Li, Daniel Huber, Andrew A. Cole, K. H. Hwang, Calen B. Henderson, Masayuki Nagakane, I.-G. Shin, Wei Zhu, Sohrab Rahvar, Yasushi Muraki, Nuno Peixinho, C.-U. Lee, Steve Hennerley, Yuri I. Fujii, M. Rabus, Paul J. Tristram, Yongseok Lee, Andrzej Udalski, G. Bryden, Michał K. Szymański, C. von Essen, Penélope Longa-Peña, Radek Poleski, Atsunori Yonehara, Eduardo Unda-Sanzana, D. J. Lee, Lauri K. Haikala, Szymon Kozłowski, Naoki Koshimoto, Patryk Iwanek, B. S. Gaudi, Julie Green, Przemek Mróz, P. Fouqué, Daniel F. Evans, Thomas Henning, Jennifer C. Yee, M. Hundertmark, J.-P. Beaulieu, Iona Kondo, Richard W. Pogge, Yutaka Matsubara, Martin Dominik, K. Hill, Akihiko Fukui, Nicholas J. Rattenbury, Etienne Bachelet, Jan Skowron, Richard Barry, Tobias C. Hinse, Tianshu Wang, Michael D. Albrow, Igor Soszyński, Krzysztof Ulaczyk, Fumio Abe, Shota Miyazaki, Yoon-Hyun Ryu, S. Calchi Novati, Rachel Street, Aparna Bhattacharya, K. A. Rybicki, Byeong-Gon Park, Martin Donachie, Denis J. Sullivan, J. W. Blackman, J. Drummond, Sedighe Sajadian, Tim Natusch, Sang-Mok Cha, Takahiro Sumi, Martin Burgdorf, Daisuke Suzuki, Andrew Gould, Clément Ranc, Yuki Hirao, Weicheng Zang, Jesper Skottfelt, Yossi Shvartzvald, G. W. Christie, Luigi Mancini, Haruno Suematsu, I. Porritt, Dong-Jin Kim, S. S. Li, Ian A. Bond, John Southworth, D. Maoz, Shude Mao, Sean Carey, David P. Bennett, Yoshitaka Itow, Y. K. Jung, Valerio Bozza, Charles A. Beichman, Hyoun-Woo Kim, Chang S. Han, Colin Snodgrass, Christiane Helling, Paweł Pietrukowicz, Subo Dong, U. G. Jørgensen, Yiannis Tsapras, Seung-Lee Kim, S. J. Chung, University of St Andrews. School of Physics and Astronomy, and University of St Andrews. St Andrews Centre for Exoplanet Science

Subjects
oscillations [stars], Red giant, fundamental parameters [stars], DWARF STARS, Astrophysics, gravitational lensing: micro, 01 natural sciences, STANDARD, Angular diameter, Bulge, QB460, PROGRAM, QB Astronomy, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, QB, Earth and Planetary Astrophysics (astro-ph.EP), Physics, PLANET PHOTOMETRY, 3rd-DAS, Astrophysics - Solar and Stellar Astrophysics, stars: fundamental parameters, stars: oscillations, Astrophysics::Earth and Planetary Astrophysics, astro-ph.SR, STELLAR OSCILLATIONS, Brown dwarf, FOS: Physical sciences, asteroseismology, Astrophysics::Cosmology and Extragalactic Astrophysics, SUBGIANTS, Gravitational microlensing, Asteroseismology, Settore FIS/05 - Astronomia e Astrofisica, ANGULAR SIZES, SYSTEMS, 0103 physical sciences, Solar and Stellar Astrophysics (astro-ph.SR), DISTANCES, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Light curve, SURFACE BRIGHTNESS RELATIONS, Space and Planetary Science, astro-ph.EP, micro [gravitational lensing], Parallax, QB799, Astrophysics - Earth and Planetary Astrophysics
Abstract

著者人数: 105名 (所属. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS): 鈴木, 大介), Number of authors: 105 (Affiliation. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS): Suzuki, Daisuke), Accepted: 2019-07-03, 資料番号: SA1190108000

Published
2019
Full Text
View/download PDF

2. OGLE-2016-BLG-1190Lb: The First Spitzer Bulge Planet Lies Near the Planet/Brown-dwarf Boundary

Author

Yuki Hirao, Yossi Shvartzvald, Kimiaki Masuda, Hyoun-Woo Kim, Chang S. Han, B. S. Gaudi, Colin Snodgrass, R. W. Schmidt, I.-G. Shin, Z. Li, Sang-Mok Cha, Kouji Ohnishi, Sohrab Rahvar, Shinyoung Kim, S. J. Chung, Yoon-Hyun Ryu, Simon Cross, C.-U. Lee, Ian A. Bond, Masayuki Nagakane, G. Bryden, Matthew T. Penny, Calen B. Henderson, P. Mróz, S. Calchi Novati, Paul J. Tristram, J. MacKenzie, S. Kozlowski, Andrzej Udalski, Nicholas J. Rattenbury, C. von Essen, Michał K. Szymański, Jan Skowron, M. Hundertmark, A. Popovas, P. Pietrukowicz, Jennifer C. Yee, P. Longa, Y. K. Jung, Radosław Poleski, Naoki Koshimoto, Valerio Bozza, Richard K. Barry, Savannah Jacklin, C. H. Ling, Etienne Bachelet, Yasushi Muraki, Fumio Abe, C. A. Beichman, Rachel Street, Tianshu Wang, Shota Miyazaki, Yongseok Lee, Markus Rabus, Sedighe Sajadian, David P. Bennett, Atsunori Yonehara, Martin Donachie, Denis J. Sullivan, To. Saito, Man Cheung Alex Li, Daniel F. Evans, Kohei Kawasaki, Yoshitaka Itow, D. Maoz, R. Figuera Jaimes, Martin Dominik, Keith Horne, Joachim Wambsganss, Phil Evans, Iain A. Steele, Takahiro Sumi, A. Bhattacharya, Steve B. Howell, Simona Ciceri, Akihiko Fukui, Byeong-Gon Park, Dong-Joo Lee, U. G. Jørgensen, Yiannis Tsapras, John Southworth, Chelsea X. Huang, Igor Soszyński, Eamonn Kerins, Sean Carey, Wei Zhu, Kyu-Ha Hwang, Giuseppe D'Ago, Shude Mao, T. Yamada, Richard W. Pogge, Yutaka Matsubara, Tobias C. Hinse, D.-J. Kim, Krzysztof Ulaczyk, Daisuke Suzuki, M. Pawlak, Arnaud Cassan, Jesper Skottfelt, Yuichiro Asakura, S. K. Ment, Andrew Gould, Clément Ranc, Weicheng Zang, Michael D. Albrow, A. Sharan, Rosita Kokotanekova, Martin Burgdorf, Pascal Fouqué, Science & Technology Facilities Council, University of St Andrews. St Andrews Centre for Exoplanet Science, and University of St Andrews. School of Physics and Astronomy

Subjects
Gas giant, GRAVITATIONAL LENSING EXPERIMENT, Brown dwarf, FOS: Physical sciences, gravitational lensing: micro, Astrophysics::Cosmology and Extragalactic Astrophysics, Cathie Marsh Institute, Gravitational microlensing, 01 natural sciences, EARTH-MASS, MAGNIFICATION MICROLENSING EVENTS, JUPITER/SATURN ANALOG, micro [Gravitational lensing], 3rd-NDAS, GAS GIANTS, SYSTEMS, Bulge, Planet, QB460, 0103 physical sciences, PHOTOMETRY, QB Astronomy, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, QC, Astrophysics::Galaxy Astrophysics, QB, Earth and Planetary Astrophysics (astro-ph.EP), Physics, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, MASS PLANET, Earth mass, Orbital period, TIME, micro, Astrophysics - Earth and Planetary Astrophysics [gravitational lensing], Stars, Space and Planetary Science, ResearchInstitutes_Networks_Beacons/cathie_marsh_institute, Astrophysics::Earth and Planetary Astrophysics, STARS, Astrophysics - Earth and Planetary Astrophysics
Abstract

著者人数: 110名(JAXA職員: 鈴木, 大介), Accepted: 2017-11-17, 資料番号: SA1170210000

Published
2018
Full Text
View/download PDF

3. OGLE-2016-BLG-0613LABb: A Microlensing Planet in a Binary System

Author

Doeon Kim, Yongseok Lee, S. Kozlowski, Krzysztof Ulaczyk, B. S. Gaudi, Yossi Shvartzvald, Hyoun-Woo Kim, Steve B. Howell, Igor Soszyński, Matthew T. Penny, Michał Pawlak, Pascal Fouqué, Tianshu Wang, Sang-Mok Cha, Jan Skowron, Savannah Jacklin, Shinyoung Kim, S. J. Chung, Y. K. Jung, Shude Mao, I.-G. Shin, C. Han, D.-J. Kim, Andrzej Udalski, Michał K. Szymański, S. Calchi Novati, Kyu-Ha Hwang, Byeong-Gon Park, Yoon-Hyun Ryu, Michael D. Albrow, Calen B. Henderson, Andrew Gould, Weicheng Zang, C.-U. Lee, Jennifer C. Yee, P. Mróz, Wei Zhu, G. Bryden, P. Pietrukowicz, Radosław Poleski, and C. A. Beichman

Subjects
Physics, Earth and Planetary Astrophysics (astro-ph.EP), Proper motion, 010504 meteorology & atmospheric sciences, Brown dwarf, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Planetary system, Light curve, Gravitational microlensing, 01 natural sciences, Space and Planetary Science, Planet, Bulge, Primary (astronomy), 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, 10. No inequality, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Astrophysics - Earth and Planetary Astrophysics
Abstract

We present the analysis of OGLE-2016-BLG-0613, for which the lensing light curve appears to be that of a typical binary-lens event with two caustic spikes but with a discontinuous feature on the trough between the spikes. We find that the discontinuous feature was produced by a planetary companion to the binary lens. We find 4 degenerate triple-lens solution classes, each composed of a pair of solutions according to the well-known wide/close planetary degeneracy. One of these solution classes is excluded due to its relatively poor fit. For the remaining three pairs of solutions, the most-likely primary mass is about $M_1\sim 0.7\,M_\odot$ while the planet is a super-Jupiter. In all cases the system lies in the Galactic disk, about half-way toward the Galactic bulge. However, in one of these three solution classes, the secondary of the binary system is a low-mass brown dwarf, with relative mass ratios (1 : 0.03 : 0.003), while in the two others the masses of the binary components are comparable. These two possibilities can be distinguished in about 2024 when the measured lens-source relative proper motion will permit separate resolution of the lens and source., 14 pages, 9 figures

Published
2017

4. A terrestrial planet in a ~1-AU orbit around one member of a ∼15-AU binary

Author

I.-G. Shin, Andrew Gould, P. Pietrukowicz, Naoki Koshimoto, Darren L. DePoy, Igor Soszyński, K. Wada, S. Kozlowski, Lydia C. Philpott, Michael D. Albrow, Łukasz Wyrzykowski, C. H. Ling, Denis J. Sullivan, Yasushi Muraki, Ian A. Bond, Jack D. Drummond, Paul J. Tristram, Atsunori Yonehara, Jennifer C. Yee, Nicholas J. Rattenbury, Jan Skowron, C.-U. Lee, R. W. Pogge, D. Maoz, S. Namba, Tim Natusch, K. Ohnishi, C. Han, To. Saito, N. Tsurumi, G. Pietrzynski, P. Mróz, Yutaka Matsubara, M. Friedmann, J.-Y. Choi, A. Fukui, Krzysztof Ulaczyk, Daisuke Suzuki, Radek Poleski, K.-H. Hwang, D. Fukunaga, M. Kubiak, Shai Kaspi, Yossi Shvartzvald, H. Ngan, C. S. Botzler, G. W. Christie, Thiam-Guan Tan, Takahiro Sumi, Kimiaki Masuda, B. S. Gaudi, Fumio Abe, Jennie McCormick, I. Porritt, David P. Bennett, Yoshitaka Itow, Youn Kil Jung, P. C. M. Yock, H. Park, Andrzej Udalski, Michał K. Szymański, P. Larsen, N. Yamai, and M. Freeman

Subjects
010504 meteorology & atmospheric sciences, Astronomical unit, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Star (graph theory), Gravitational microlensing, 7. Clean energy, 01 natural sciences, Planet, 0103 physical sciences, Binary star, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Earth and Planetary Astrophysics (astro-ph.EP), Physics, Multidisciplinary, Astronomy, Orbit, 13. Climate action, Physics::Space Physics, Terrestrial planet, Astrophysics::Earth and Planetary Astrophysics, Low Mass, Astrophysics - Earth and Planetary Astrophysics
Abstract

We detect a cold, terrestrial planet in a binary-star system using gravitational microlensing. The planet has low mass (2 Earth masses) and lies projected at $a_{\perp,ph}$ ~ 0.8 astronomical units (AU) from its host star, similar to the Earth-Sun distance. However, the planet temperature is much lower, T, Published in Science, Main and supplementary material combined

Published
2014
Full Text
View/download PDF

5. Ground-based parallax confirmed by Spitzer: binary microlensing event MOA-2015-BLG-020

Author

Jennifer C. Yee, Igor Soszyński, K.-H. Hwang, David P. Bennett, Andrew Gould, Clément Ranc, Martin Donachie, Denis J. Sullivan, Iain A. Steele, Valerio Bozza, Y. Yee, Etienne Bachelet, Yoshitaka Itow, M. Hundertmark, Man Cheung Alex Li, S. L. Kim, I.-G. Shin, K. Kawasaki, Wei Zhu, Richard K. Barry, J. W. Menzies, Sean Carey, M. Pawlak, P. Pietrukowicz, Yuki Hirao, Radosław Poleski, Naoki Koshimoto, Michael D. Albrow, Sun-Ju Chung, Ian A. Bond, C.-U. Lee, Paul J. Tristram, Hyoun-Woo Kim, T. Yamada, B. Wibking, Yoon-Hyun Ryu, C. H. Ling, Calen B. Henderson, Shude Mao, Hiroshi Shibai, C. A. Beichman, Masayuki Nagakane, Kimiaki Masuda, Yossi Shvartzvald, Andrzej Udalski, Akihiko Fukui, Michael Fausnaugh, Michał K. Szymański, Richard W. Pogge, Yutaka Matsubara, Satoshi Miyazaki, Chang S. Han, P. Mróz, Martin Dominik, B. S. Gaudi, Krzysztof Ulaczyk, Colin Snodgrass, R. Figuera Jaimes, To. Saito, D.-J. Kim, G. Bryden, Yasushi Muraki, Atsunori Yonehara, R. W. Schmidt, Joachim Wambsganss, Keith Horne, Yiannis Tsapras, Y. K. Jung, S. Kozlowski, Rachel Street, Kouji Ohnishi, Yuichiro Asakura, Tianshu Wang, Nicholas J. Rattenbury, Jan Skowron, Takahiro Sumi, A. Sharan, Daisuke Suzuki, Arnaud Cassan, P. A. Evans, S. Calchi Novati, Sang-Mok Cha, Fumio Abe, Byeong-Gon Park, A. Bhattacharya, D. M. Bramich, University of St Andrews. School of Physics and Astronomy, and University of St Andrews. St Andrews Centre for Exoplanet Science

Subjects
010504 meteorology & atmospheric sciences, bulge [Galaxy], FOS: Physical sciences, Astrophysics, gravitational lensing: micro, Astrophysics::Cosmology and Extragalactic Astrophysics, Gravitational microlensing, 01 natural sciences, Galaxy: bulge, Einstein radius, general [binaries], Bulge, 0103 physical sciences, QB Astronomy, Astrophysics::Solar and Stellar Astrophysics, Disc, 010303 astronomy & astrophysics, Red clump, QC, Astrophysics::Galaxy Astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), 0105 earth and related environmental sciences, QB, Physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, 3rd-DAS, Light curve, Stars, QC Physics, binaries: general, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, micro [gravitational lensing], Astrophysics::Earth and Planetary Astrophysics, Parallax
Abstract

著者人数: 86名 (JAXA職員: 鈴木, 大介), Accepted: 2017-07-14, 資料番号: SA1170116000

Published
2017
Full Text
View/download PDF

6. OGLE-2016-BLG-0263L\lowercase{b}: Microlensing Detection of a Very Low-mass Binary Companion Through a Repeating Event Channel

Author

Yutaka Matsubara, C.-U. Lee, Michał Pawlak, Krzysztof Ulaczyk, I.-G. Shin, David P. Bennett, Jennifer C. Yee, Paul J. Tristram, Yoshitaka Itow, Richard K. Barry, Andrew Gould, Clément Ranc, Phil Evans, Yasushi Muraki, Yongseok Lee, Atsunori Yonehara, Ian A. Bond, C. Han, Martin Donachie, Denis J. Sullivan, Wei Zhu, T. Yamada, Byeong-Gon Park, Dong-Jin Kim, Masayuki Nagakane, C. H. Ling, Man Cheung Alex Li, Y. K. Jung, K. Ohnishi, P. Pietrukowicz, Radosław Poleski, Naoki Koshimoto, P. Mróz, Takahiro Sumi, Michael D. Albrow, To. Saito, Yuichiro Asakura, Nicholas J. Rattenbury, Jan Skowron, Igor Soszyński, A. Sharan, Yoon-Hyun Ryu, Fumio Abe, Daisuke Suzuki, Yuki Hirao, Kimiaki Masuda, Sang-Mok Cha, S. J. Chung, Andrzej Udalski, Michał K. Szymański, Seung-Lee Kim, Aparna Bhattacharya, Akihiko Fukui, and S. Kozlowski

Subjects
Physics, Earth and Planetary Astrophysics (astro-ph.EP), 010504 meteorology & atmospheric sciences, Channel (digital image), Event (relativity), Brown dwarf, Binary number, FOS: Physical sciences, Astronomy and Astrophysics, gravitational lensing: micro, Astrophysics, Planetary system, Gravitational microlensing, 01 natural sciences, Space and Planetary Science, 0103 physical sciences, Low Mass, planetary systems, 010303 astronomy & astrophysics, Astrophysics - Earth and Planetary Astrophysics, brown dwarfs, 0105 earth and related environmental sciences
Abstract

著者人数: 55名 (JAXA職員: 鈴木, 大介), Accepted: 2017-08-08, 資料番号: SA1170115000

Published
2017
Full Text
View/download PDF

7. Binary Source Microlensing Event OGLE-2016-BLG-0733: Interpretation of A Long-term Asymmetric Perturbation

Author

S. Kozlowski, C. Han, R. W. Pogge, Martin Donachie, Wei Zhu, Denis J. Sullivan, Man Cheung Alex Li, Fumio Abe, S. J. Chung, Masayuki Nagakane, Y. K. Jung, Daisuke Suzuki, Andrew Gould, Sang-Mok Cha, P. Pietrukowicz, Radosław Poleski, Naoki Koshimoto, I.-G. Shin, Aparna Bhattacharya, Andrzej Udalski, Michał K. Szymański, Seung-Lee Kim, P. Mróz, Yutaka Matsubara, Akihiko Fukui, Paul J. Tristram, Kimiaki Masuda, Yoon-Hyun Ryu, Richard K. Barry, H. Oyokawa, Krzysztof Ulaczyk, Michael D. Albrow, Igor Soszyński, C. H. Ling, Ian A. Bond, C.-U. Lee, Yuichiro Asakura, Kyu-Ha Hwang, D.-J. Kim, A. Sharan, Yasushi Muraki, M. Freeman, Michał Pawlak, Jennifer C. Yee, Yongseok Lee, Atsunori Yonehara, David P. Bennett, T. Yamada, Yoshitaka Itow, Nicholas J. Rattenbury, Jan Skowron, Byeong-Gon Park, Yuki Hirao, and Takahiro Sumi

Subjects
Physics, Earth and Planetary Astrophysics (astro-ph.EP), 010504 meteorology & atmospheric sciences, Einstein ring, Perturbation (astronomy), Binary number, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Gravitational microlensing, Light curve, 01 natural sciences, symbols.namesake, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Planet, 0103 physical sciences, symbols, Astrophysics::Earth and Planetary Astrophysics, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), 0105 earth and related environmental sciences, Astrophysics - Earth and Planetary Astrophysics
Abstract

In the process of analyzing an observed light curve, one often confronts various scenarios that can mimic the planetary signals causing difficulties in the accurate interpretation of the lens system. In this paper, we present the analysis of the microlensing event OGLE-2016-BLG-0733. The light curve of the event shows a long-term asymmetric perturbation that would appear to be due to a planet. From the detailed modeling of the lensing light curve, however, we find that the perturbation originates from the binarity of the source rather than the lens. This result demonstrates that binary sources with roughly equal-luminosity components can mimic long-term perturbations induced by planets with projected separations near the Einstein ring. The result also represents the importance of the consideration of various interpretations in planet-like perturbations and of high-cadence observations for ensuring the unambiguous detection of the planet., Comment: 7 pages, 1 tables, 7 figures, Accepted to AJ

Published
2016
Full Text
View/download PDF

8. OGLE-2012-BLG-0455/MOA-2012-BLG-206: Microlensing Event with Ambiguity in Planetary Interpretations Caused by Incomplete Coverage of Planetary Signal

Author

J.-Y. Choi, Jennifer C. Yee, Akihiko Fukui, Fumio Abe, S. Namba, Kouji Ohnishi, B. S. Gaudi, C.-U. Lee, M. Kubiak, N. Yamai, M. Freeman, Nicholas J. Rattenbury, Jan Skowron, A. Kavka, K. Wada, L. A. G. Monard, To. Saito, Grzegorz Pietrzyński, Ian A. Bond, Łukasz Wyrzykowski, Takahiro Sumi, Andrzej Udalski, Michał K. Szymański, Kimiaki Masuda, C. H. Ling, I.-G. Shin, Chang S. Han, Denis J. Sullivan, Paul J. Tristram, Daisuke Suzuki, D. Fukunaga, C. S. Botzler, Winston L. Sweatman, Igor Soszyński, Paul Chote, Andrew Gould, Philip Yock, Paweł Pietrukowicz, Subo Dong, Tim Natusch, Radosław Poleski, Naoki Koshimoto, H. Ngan, Szymon Kozłowski, Richard W. Pogge, Yutaka Matsubara, Krzysztof Ulaczyk, K.-H. Hwang, P. Harris, Pascal Fouqué, Darren L. DePoy, Y. K. Jung, H. Park, David P. Bennett, Yoshitaka Itow, G. W. Christie, Yasushi Muraki, and Atsunori Yonehara

Subjects
Physics, Earth and Planetary Astrophysics (astro-ph.EP), 010504 meteorology & atmospheric sciences, media_common.quotation_subject, Degenerate energy levels, Perturbation (astronomy), FOS: Physical sciences, Astronomy and Astrophysics, Visible radiation, Ambiguity, Astrophysics, Gravitational microlensing, Light curve, 01 natural sciences, Exoplanet, Space and Planetary Science, Planet, 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, media_common, Astrophysics - Earth and Planetary Astrophysics
Abstract

Characterizing a microlensing planet is done from modeling an observed lensing light curve. In this process, it is often confronted that solutions of different lensing parameters result in similar light curves, causing difficulties in uniquely interpreting the lens system, and thus understanding the causes of different types of degeneracy is important. In this work, we show that incomplete coverage of a planetary perturbation can result in degenerate solutions even for events where the planetary signal is detected with a high level of statistical significance. We demonstrate the degeneracy for an actually observed event OGLE-2012-BLG-0455/MOA-2012-BLG-206. The peak of this high-magnification event $(A_{\rm max}\sim400)$ exhibits very strong deviation from a point-lens model with $\Delta\chi^{2}\gtrsim4000$ for data sets with a total number of measurement 6963. From detailed modeling of the light curve, we find that the deviation can be explained by four distinct solutions, i.e., two very different sets of solutions, each with a two-fold degeneracy. While the two-fold (so-called "close/wide") degeneracy is well-understood, the degeneracy between the radically different solutions is not previously known. The model light curves of this degeneracy differ substantially in the parts that were not covered by observation, indicating that the degeneracy is caused by the incomplete coverage of the perturbation. It is expected that the frequency of the degeneracy introduced in this work will be greatly reduced with the improvement of the current lensing survey and follow-up experiments and the advent of new surveys., Comment: 5 pages, 3 figures, ApJ accepted

Published
2014

9. Candidate Gravitational Microlensing Events for Future Direct Lens Imaging

Author

I.-G. Shin, J.-Y. Choi, Paul J. Tristram, H. Park, Jennifer C. Yee, K. Wada, Grzegorz Pietrzyński, Łukasz Wyrzykowski, D. Moorhouse, Shai Kaspi, Yossi Shvartzvald, M. Hundertmark, D. M. Bramich, Andrew Gould, Yasushi Muraki, Akihiko Fukui, D. Fukunaga, Atsunori Yonehara, Richard W. Pogge, Yutaka Matsubara, G. Thornley, C. S. Botzler, Jennie McCormick, Alasdair Allan, C.-U. Lee, Winston L. Sweatman, Keith Horne, Igor Soszyński, Krzysztof Ulaczyk, G. W. Christie, Philip Yock, Paweł Pietrukowicz, Francisco Jablonski, Daisuke Suzuki, Kimiaki Masuda, K.-H. Hwang, S. Namba, M. Bos, Subo Dong, Yiannis Tsapras, Denis J. Sullivan, To. Saito, Takahiro Sumi, Andrzej Udalski, Chang S. Han, David P. Bennett, Naoki Koshimoto, Iain A. Steele, Michał K. Szymański, Tim Natusch, Yoshitaka Itow, M. Friedmann, Colin Snodgrass, C. H. Ling, Martin Dominik, Calen B. Henderson, Kouji Ohnishi, B. S. Gaudi, N. Kains, N. Yamai, M. Freeman, R. Figuera Jaimes, N. Tsurumi, Thiam-Guan Tan, Darren L. DePoy, H. Ngan, Fumio Abe, Y. K. Jung, Valerio Bozza, Szymon Kozłowski, D. Maoz, P. Browne, Nicholas J. Rattenbury, Jan Skowron, R. Poleski, M. Kubiak, Rachel Street, Leonardo A. Almeida, Ian A. Bond, The Royal Society, Science & Technology Facilities Council, and University of St Andrews. School of Physics and Astronomy

Subjects
Proper motion, Mass planet, Chemical evolution, FOS: Physical sciences, Astrophysics, Gravitational microlensing, 01 natural sciences, Optical depth, law.invention, micro [Gravitational lensing], Orbital motion, Robustness (computer science), Bulge, law, Brown dwarf, 0103 physical sciences, QB Astronomy, 010306 general physics, Adaptive optics, 010303 astronomy & astrophysics, Parallax, QC, Solar and Stellar Astrophysics (astro-ph.SR), QB, Physics, Galactic bulge, general [Binaries], Spatially resolved, Planetary companion, Astronomy and Astrophysics, OGLE-III, Lens (optics), Stars, QC Physics, Astrophysics - Solar and Stellar Astrophysics, Binary-lens, Space and Planetary Science
Abstract

The mass of the lenses giving rise to Galactic microlensing events can be constrained by measuring the relative lens-source proper motion and lens flux. The flux of the lens can be separated from that of the source, companions to the source, and unrelated nearby stars with high-resolution images taken when the lens and source are spatially resolved. For typical ground-based adaptive optics (AO) or space-based observations, this requires either inordinately long time baselines or high relative proper motions. We provide a list of microlensing events toward the Galactic Bulge with high relative lens-source proper motion that are therefore good candidates for constraining the lens mass with future high-resolution imaging. We investigate all events from 2004 -- 2013 that display detectable finite-source effects, a feature that allows us to measure the proper motion. In total, we present 20 events with mu >~ 8 mas/yr. Of these, 14 were culled from previous analyses while 6 are new, including OGLE-2004-BLG-368, MOA-2005-BLG-36, OGLE-2012-BLG-0211, OGLE-2012-BLG-0456, MOA-2012-BLG-532, and MOA-2013-BLG-029. In, Comment: 10 pages, 8 figures, 6 tables, submitted to ApJ. For a brief video explaining the key results of this paper, please visit: https://www.youtube.com/watch?v=i_dzT8NydJI

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results