Search for extrasolar planets with microlensing

• Project/Area Number: 16H05732
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: 阿部 文雄 名古屋大学, 宇宙地球環境研究所, 准教授 (80184224)
• Co-Investigator(Kenkyū-buntansha): 米原 厚憲 京都産業大学, 理学部, 教授 (10454472) ; 松原 豊 名古屋大学, 宇宙地球環境研究所, 准教授 (80202323)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Granted (Fiscal Year 2019)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2018: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
• Keywords: 重力レンズ / 太陽系外惑星 / 光学赤外線天文学 / 惑星形成 / 星・惑星形成 / 光学・赤外線天文学 / 可視赤外線天文学

Outline of Annual Research Achievements

本研究は、銀河中心付近のマイクロレンズ法による太陽系外惑星の探索を実施し、惑星形成の解明を目指すものである。この手法は、視線速度法やトランジット法などと比べ、外側の軌道を回る惑星に感度が高く、地球質量程度まで発見可能であることが特長である。
観測は、ニュージランド・マウントジョン天文台に設置した1.8m広視野望遠鏡によるサーベイ観測と、同天文台の61cm望遠鏡をはじめとする世界各地の望遠鏡による追観測によって、重力マイクロレンズ効果による増光現象の光度曲線（明るさの時間変化）を求めた。この光度曲線の詳細な解析を行うことにより、太陽系外惑星の発見を行う。この解析は、特異性のある重力レンズ効果のモデルによるフィッティングを行い、複数の局所解の中から最適解を求める複雑な解析を必要とし、通常１年以上かかる。
計画された２０１８年の観測は、日本から派遣した観測員（多くは大学院生）と現地観測員の協力によりほぼ予定通り実施され、リアルタイム解析によりバルジ方向に413個のマイクロレンズ事象を発見し、メールおよびホームページによって世界中の研究者に通知を行った。また、惑星の可能性のあるアノーマリー（変位）が観測された事象や惑星発見の可能性の高い高増光率の事象は、61cm望遠鏡や世界中の多くの望遠鏡と協力して集中的な観測を行った。これらの事象に対するこれまでの解析は、国際協力で実施されており、これまでのところ、５、６個の惑星候補が発見されており、さらに詳細な解析が進行中である。これらの結果は、解析が終了したものから順に学術誌等で公表する。
また、今年度は大マゼラン雲でのマイクロレンズ事象が各県され、トランジット観測衛星TESSなどによる追観測も行われた。今後、こうした事象が増えれば、銀河系外惑星の発見も期待できる。そのほか、惑星以外にも褐色矮星などの発見もなされた。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

観測に関しては、大きなトラブルも無く、日本から派遣した観測員と現地観測員との協力もうまく行った。また、アメリカやニュージーランドの研究者・学生による観測も行われ、観測における国際協力が有効に機能してきた。リアルタイムデータ処理によって、マイクロレンズ事象の発見・惑星などによるアノーマリー（変位）発見もうまく機能し、世界的な観測網による追観測も順調に進んだ。
これらに加え、最近では衛星を使った宇宙からのマイクロレンズ観測が盛んになって来た。赤外線天文衛星Spitzerは、すでに冷却用のヘリウムを使いきっているが、マイクロレンズ観測にはまだ使える。残念ながら、Kepler衛星は運用を停止したが、今後も衛星を使った宇宙からのパララックス観測は行われると予想される。
こうした宇宙からのパララックス観測により、従来距離が決まらないために不正確だった物理パラメーターも良く決まる様になってきた。国際協力によるデータ解析も順調に進行し、次々と学術誌に結果を公表している。その多くは、惑星発見のものである。発見された惑星の統計解析も行われ、惑星の頻度が海王星程度で頭打ちになることが判明した。同様の頻度分布の折れ曲がりは、トランジット法による内側の惑星に関しても確認されている。今後の理論的な研究に期待したい。
この様に、研究は着実に進展している。今後、さらに発見数を増やすとともに、衛星による宇宙からの観測を実施し、様々な統計解析を実施することにより、２０２０年台に予定されているNASAのWFIRST, ESAのEuclidなどによる本格的な宇宙からのマイクロレンズサーベイに繋げられることが期待できる。こうした状況から、おおむ
ね順調に進展していると判断した。

Strategy for Future Research Activity

ニュージーランドでの観測手法はすでにほぼ確立しており、今後は主として維持・運用が中心となる。予想される改善点としては、国際協力を推し進め外国の研究機関（ニュージーランドやアメリカの大学・NASAなどの研究機関）による観測などである。一方、世界的な観測網による追観測は、今後も増え続けることが予想される。韓国のKMTnet（チリ、南アフリカ、オーストラリア）も徐々に立ち上がって来たので、こうした観測網との協力も今後重要となる。Spitzer衛星との協力も今後さらに推進し、物理パラメーターのより良い決定を図るとともに、２０２０年代はじめに予定されている、Euclidや2030年代に打ち上げ予定のWFIRST衛星による本格的な宇宙からのマイクロレンズ観測に備える。
データ解析に関しては、当面これまでの国際協力によるデータ解析体制を維持し、さらに成果を上げる。また、それと平行してこれまでの解析法の改良を試みる。マイクロレンズのデータ解析は、特異性のある重力レンズの増光を扱うため、モデルの計算自身も難しく、局所解が多数出てきてしまう。このため、多くの計算時間と事象ごとに多くの手作業を必要とする。また、惑星系の様な多重レンズの問題を解くことは非常に難しく、これまで実用的に解くことができたのは、３重レンズ（１主星＋２惑星、２主星＋１惑星など）までである。今後、宇宙からの観測が本格化して測光精度が高くなると、惑星系によるわずかな増光が多数発見される可能性がある。これらの問題は、いずれも解決が困難であるが、多重レンズに関しては繰り返し近似法に目処がたってきたので、その実用化を目指す。
今後、さらに進めなければいけないのは、発見数を増やし統計解析をして、理論と比較することである。これまで、統計解析はある程度出来ているが、理論との比較は理論側の進展も重要となる。

Research Products

• [Int'l Joint Research] University of Auckland/Massey University/University of Canterbury(ニュージーランド)
• [Int'l Joint Research] University of Merryland/NASA(米国)
• [Int'l Joint Research] Auckland University/Massey University/University of Canterbury(New Zealand)
• [Int'l Joint Research] University of Meryland/NASA Goddard Space Flight Center(USA)
• [Journal Article] First Assessment of the Binary Lens OGLE-2015-BLG-0232 (2019)
  • Author(s): Bachelet E.他
  • Journal Title: The Astrophysical Journal Volume: 870 Pages: 11-11
  • DOI: 10.3847/1538-4357/aaedb9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Two new free-floating or wide-orbit planets from microlensing (2019)
  • Author(s): Mroz Przemek他
  • Journal Title: Astronomy and Astrophysics Volume: 622
  • DOI: 10.1051/0004-6361/201834557
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spitzer Microlensing of MOA-2016-BLG-231L: A Counter-rotating Brown Dwarf Binary in the Galactic Disk (2019)
  • Author(s): Chung Sun-Ju他
  • Journal Title: The Astrophysical Journal Volume: 871 Pages: 179-179
  • DOI: 10.3847/1538-4357/aaf861
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spitzer Microlensing Parallax for OGLE-2016-BLG-1067: A Sub-Jupiter Orbiting an M Dwarf in the Disk (2019)
  • Author(s): Calchi Novati S.他
  • Journal Title: The Astronomical Journal Volume: 157 Pages: 121-121
  • DOI: 10.3847/1538-3881/ab0106
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2014-BLG-0962 and a Comparison of Galactic Model Priors to Microlensing Data (2019)
  • Author(s): Shan Yutong他
  • Journal Title: The Astrophysical Journal Volume: 873 Pages: 30-30
  • DOI: 10.3847/1538-4357/ab0021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2017-BLG-0482Lb: A Microlensing Super-Earth Orbiting a Low-mass Host Star (2018)
  • Author(s): Han C.他
  • Journal Title: The Astronomical Journal Volume: 155 Pages: 211-211
  • DOI: 10.3847/1538-3881/aabad2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2015-BLG-1459L: The Challenges of Exo-moon Microlensing (2018)
  • Author(s): Hwang K.-H.他
  • Journal Title: The Astronomical Journal Volume: 155 Pages: 259-259
  • DOI: 10.3847/1538-3881/aac2cb
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A Likely Detection of a Two-planet System in a Low-magnification Microlensing Event (2018)
  • Author(s): Suzuki D.他
  • Journal Title: The Astronomical Journal Volume: 155 Pages: 263-263
  • DOI: 10.3847/1538-3881/aabd7a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291 (2018)
  • Author(s): Bennett David P.他
  • Journal Title: The Astronomical Journal Volume: 156 Pages: 113-113
  • DOI: 10.3847/1538-3881/aad59c
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] MOA-2015-BLG-337: A Planetary System with a Low-mass Brown Dwarf/Planetary Boundary Host, or a Brown Dwarf Binary (2018)
  • Author(s): Miyazaki S.他
  • Journal Title: The Astronomical Journal Volume: 156 Pages: 136-136
  • DOI: 10.3847/1538-3881/aad5ee
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] MOA-2016-BLG-319Lb: Microlensing Planet Subject to Rare Minor-image Perturbation Degeneracy in Determining Planet Parameters (2018)
  • Author(s): Han Cheongho他
  • Journal Title: The Astronomical Journal Volume: 156 Pages: 226-226
  • DOI: 10.3847/1538-3881/aae38e
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2017-BLG-0039: Microlensing Event with Light from a Lens Identified from Mass Measurement (2018)
  • Author(s): Han C.他
  • Journal Title: The Astrophysical Journal Volume: 867 Pages: 136-136
  • DOI: 10.3847/1538-4357/aae536
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A study of the light travel time effect in short-period MOA eclipsing binaries via eclipse timing (2018)
  • Author(s): Li M C A、Rattenbury N J、Bond I A、Sumi T、Bennett D P、Koshimoto N、Abe F、Asakura Y、Barry R、Bhattacharya A、Donachie M、Evans P、Fukui A、Hirao Y、Itow Y、Masuda K、Matsubara Y、Muraki Y、Nagakane M、Ohnishi K、Saito To、Sharan A、Sullivan D J、Suzuki D、Tristram P J、Yonehara A
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 480 Pages: 4557-4557
  • DOI: 10.1093/mnras/sty2104
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A Detailed Observational Analysis of V1324 Sco, the Most Gamma-Ray-luminous Classical Nova to Date (2018)
  • Author(s): Finzell Thomas、et al.
  • Journal Title: The Astrophysical Journal Volume: 852 Pages: 108-108
  • DOI: 10.3847/1538-4357/aaa12a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-peak Gravitational Microlensing Event (2018)
  • Author(s): Udalski A.、et al.
  • Journal Title: The Astrophysical Journal Volume: 853 Pages: 70-70
  • DOI: 10.3847/1538-4357/aaa295
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The First Planetary Microlensing Event with Two Microlensed Source Stars (2018)
  • Author(s): Bennett D. P.、et al.
  • Journal Title: The Astronomical Journal Volume: 155 Pages: 141-141
  • DOI: 10.3847/1538-3881/aaadfa
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Subaru Hyper Suprime-Cam Survey for an optical counterpart of GW170817 (2018)
  • Author(s): Tominaga N.、Tanaka M.、Morokuma T.、Utsumi Y.、Yamaguchi M. S、Yasuda N.、Tanaka M.、Yoshida M.、et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Pages: 1-11
  • DOI: 10.1093/pasj/psy007
  • NAID: 120006537077
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Faint-source-star planetary microlensing: the discovery of the cold gas-giant planet OGLE-2014-BLG-0676Lb (2017)
  • Author(s): Rattenbury, N. J., Bennett, D. P., Sumi, T., Koshimoto, N., et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 466 Pages: 2710-2717
  • DOI: 10.1093/mnras/stw3185
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] OGLE-2016-BLG-1003: First Resolved Caustic-crossing Binary-source Event Discovered by Second-generation Microlensing Surveys (2017)
  • Author(s): Jung Y. K.、et al.
  • Journal Title: The Astrophysical Journal Volume: 841 Pages: 75-75
  • DOI: 10.3847/1538-4357/aa7057
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2013-BLG-1761Lb: A Massive Planet around an M/K Dwarf (2017)
  • Author(s): Hirao Y.、et al.
  • Journal Title: The Astronomical Journal Volume: 154 Pages: 1-1
  • DOI: 10.3847/1538-3881/aa73da
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging (2017)
  • Author(s): Koshimoto N.、et al.
  • Journal Title: The Astronomical Journal Volume: 154 Pages: 3-3
  • DOI: 10.3847/1538-3881/aa72e0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] MOA-2012-BLG-505Lb: A Super-Earth-mass Planet That Probably Resides in the Galactic Bulge (2017)
  • Author(s): Nagakane M.、et al.
  • Journal Title: The Astronomical Journal Volume: 154 Pages: 35-35
  • DOI: 10.3847/1538-3881/aa74b2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2016-BLG-1469L: Microlensing Binary Composed of Brown Dwarfs (2017)
  • Author(s): Han C.、et al.
  • Journal Title: The Astrophysical Journal Volume: 843 Pages: 59-59
  • DOI: 10.3847/1538-4357/aa740e
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing (2017)
  • Author(s): Poleski R.、et al.
  • Journal Title: Astronomy & Astrophysics Volume: 604
  • DOI: 10.1051/0004-6361/201730928
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] MOA Data Reveal a New Mass, Distance, and Relative Proper Motion for Planetary System OGLE-2015-BLG-0954L (2017)
  • Author(s): Bennett D. P.、et al.
  • Journal Title: The Astronomical Journal Volume: 154 Pages: 68-68
  • DOI: 10.3847/1538-3881/aa7aee
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ground-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020 (2017)
  • Author(s): Wang Tianshu、et al.
  • Journal Title: The Astrophysical Journal Volume: 845 Pages: 129-129
  • DOI: 10.3847/1538-4357/aa813b
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The lowest mass ratio planetary microlens: OGLE 2016-BLG-1195Lb (2017)
  • Author(s): Bond I. A.、et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 469 Pages: 2434-2440
  • DOI: 10.1093/mnras/stx1049
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars (2017)
  • Author(s): Bensby T.、et al.
  • Journal Title: Astronomy & Astrophysics Volume: 605
  • DOI: 10.1051/0004-6361/201730560
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The first eclipsing binary catalogue from the MOA-II data base (2017)
  • Author(s): Li M. C. A.、et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 470 Pages: 539-550
  • DOI: 10.1093/mnras/stx1280
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2016-BLG-0263Lb: Microlensing Detection of a Very Low-mass Binary Companion through a Repeating Event Channel (2017)
  • Author(s): Han C.、et al.
  • Journal Title: The Astronomical Journal Volume: 154 Pages: 133-133
  • DOI: 10.3847/1538-3881/aa859a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multi-messenger Observations of a Binary Neutron Star Merger (2017)
  • Author(s): Abbott B. P., Abbott, R., Abbott, T. D., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R. X., Adya, V. B., Affeldt, C., Afrough, M., Agarwal, B., Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O. D., Aiello, L., Ain, A., Ajith, P. 他 Negoro, H. 含む 3656 名
  • Journal Title: Astrophysical Journal Letters Volume: 848 Pages: 1-59
  • DOI: 10.3847/2041-8213/aa91c9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2013-BLG-0132Lb and OGLE-2013-BLG-1721Lb: Two Saturn-mass Planets Discovered around M-dwarfs (2017)
  • Author(s): Mr?z Przemek、et al.
  • Journal Title: The Astronomical Journal Volume: 154 Pages: 205-205
  • DOI: 10.3847/1538-3881/aa8f98
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Pluto occultation on 2015 June 29 UTC with central flash and atmospheric spikes just before the New Horizons flyby (2017)
  • Author(s): Pasachoff Jay M.、Babcock Bryce A.、Durst Rebecca F.、Seeger Christina H.、Levine Stephen E.、Bosh Amanda S.、Person Michael J.、Sickafoose Amanda A.、Zuluaga Carlos A.、Kosiarek Molly R.、Abe Fumio、Nagakane Masayuki、Suzuki Daisuke、Tristram Paul J.、Arredondo Anicia
  • Journal Title: Icarus Volume: 296 Pages: 305-314
  • DOI: 10.1016/j.icarus.2017.05.012
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817 (2017)
  • Author(s): Utsumi Yousuke , Tanaka Masaomi , Tominaga Nozomu , Yoshida Michitoshi , Barway Sudhanshu , Nagayama Takahiro , Zenko Tetsuya , Aoki Kentaro , Fujiyoshi Takuya , Furusawa Hisanori , et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Pages: 101-101
  • DOI: 10.1093/pasj/psx118
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Kilonova from post-merger ejecta as an optical and near-Infrared counterpart of GW170817 (2017)
  • Author(s): Tanaka Masaomi , Utsumi Yousuke , Mazzali Paolo A. , Tominaga Nozomu , Yoshida Michitoshi , Sekiguchi Yuichiro , Morokuma Tomoki , Motohara Kentaro , Ohta Kouji , Kawabata Koji S. , et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Pages: 102-102
  • DOI: 10.1093/pasj/psx121
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2016-BLG-1190Lb: The First Spitzer Bulge Planet Lies Near the Planet/Brown-dwarf Boundary (2017)
  • Author(s): Ryu Y.-H.、et al.
  • Journal Title: The Astronomical Journal Volume: 155 Pages: 40-40
  • DOI: 10.3847/1538-3881/aa9be4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] OGLE-2012-BLG-0950Lb: THE FIRST PLANET MASS MEASUREMENT FROM ONLY MICROLENS PARALLAX AND LENS FLUX (2017)
  • Author(s): Koshimoto, N.他
  • Journal Title: The Astronomical Journal Volume: 153 Pages: 1-1
  • DOI: 10.3847/1538-3881/153/1/1
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] J-GEM follow-up observations of the gravitational wave source GW151226 (2017)
  • Author(s): Yoshida, Michitoshi他
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Pages: 9-9
  • DOI: 10.1093/pasj/psw113
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Binary Source Microlensing Event OGLE-2016-BLG-0733: Interpretation of a Long-term Asymmetric Perturbation (2017)
  • Author(s): Jung, Y. K.他
  • Journal Title: The Astronomical Journal Volume: 153 Pages: 129-129
  • DOI: 10.3847/1538-3881/aa5d07
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The frequency of snowline-region planets from four years of OGLE?MOA?Wise second-generation microlensing (2016)
  • Author(s): Shvartzvald, Y.他
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 457 Pages: 4089-4113
  • DOI: 10.1093/mnras/stw191
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] REVISITING THE MICROLENSING EVENT OGLE 2012-BLG-0026: A SOLAR MASS STAR WITH TWO COLD GIANT PLANETS (2016)
  • Author(s): Bealieu. J.-P.他
  • Journal Title: The Astrophysical Journal Volume: 824 Pages: 83-83
  • DOI: 10.3847/0004-637x/824/2/83
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] OGLE-2012-BLG-0724LB: A SATURN-MASS PLANET AROUND AN M DWARF (2016)
  • Author(s): Hirao, Y.他
  • Journal Title: The Astrophysical Journal Volume: 824 Pages: 139-139
  • DOI: 10.3847/0004-637x/824/2/139
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] THE FIRST NEPTUNE ANALOG OR SUPER-EARTH WITH A NEPTUNE-LIKE ORBIT: MOA-2013-BLG-605LB (2016)
  • Author(s): Sumi, T.他
  • Journal Title: The Astrophysical Journal Volume: 825 Pages: 112-112
  • DOI: 10.3847/0004-637x/825/2/112
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] LOCALIZATION AND BROADBAND FOLLOW-UP OF THE GRAVITATIONAL-WAVE TRANSIENT GW150914 (2016)
  • Author(s): B. P. Abbott, R. Abbott, T. D. Abbott, M. R. Abernathy, F. Acernese, K. Ackley, C. Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B. and 1564 coauthors
  • Journal Title: The Astrophysical Journal Volume: 826
  • DOI: 10.3847/2041-8205/826/1/l13
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] SUPPLEMENT: “LOCALIZATION AND BROADBAND FOLLOW-UP OF THE GRAVITATIONAL-WAVE TRANSIENT GW150914” (2016, ApJL, 826, L13) (2016)
  • Author(s): Abbott B.P., Abbott R., Abbott T.D., Abernathy M.R., Acernese F., Ackley K., Adams C., Adams T., Addesso P., Adhikari R.X. and 1567 coauthors
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 225 Pages: 8-8
  • DOI: 10.3847/0067-0049/225/1/8
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] J-GEM follow-up observations to search for an optical counterpart of the first gravitational wave source GW150914 (2016)
  • Author(s): T Morokuma, M Tanaka, Y Asakura, F Abe, PJ. Tristram, Y Utsumi, M Doi, K Fujisawa, R Itoh, Y Itoh, K S. Kawabata, N Kawai, D Kuroda, K Matsubayashi, Yoshihiko Saito, Yoichi Yatsu, et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68
  • DOI: 10.1093/pasj/psw061
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] THE FIRST CIRCUMBINARY PLANET FOUND BY MICROLENSING: OGLE-2007-BLG-349L(AB)c (2016)
  • Author(s): Bennett, D. P.他
  • Journal Title: The Astronomical Journal Volume: 152 Pages: 125-125
  • DOI: 10.3847/0004-6256/152/5/125
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] DISCOVERY OF A GAS GIANT PLANET IN MICROLENSING EVENT OGLE-2014-BLG-1760 (2016)
  • Author(s): Bhattacharya, A.他
  • Journal Title: The Astronomical Journal Volume: 152 Pages: 140-140
  • DOI: 10.3847/0004-6256/152/5/140
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] THE FIRST SIMULTANEOUS MICROLENSING OBSERVATIONS BY TWO SPACE TELESCOPES:SPITZERANDSWIFTREVEAL A BROWN DWARF IN EVENT OGLE-2015-BLG-1319 (2016)
  • Author(s): Shvartzvald, Y.他
  • Journal Title: The Astrophysical Journal Volume: 831 Pages: 183-183
  • DOI: 10.3847/0004-637x/831/2/183
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] THE EXOPLANET MASS-RATIO FUNCTION FROM THE MOA-II SURVEY: DISCOVERY OF A BREAK AND LIKELY PEAK AT A NEPTUNE MASS (2016)
  • Author(s): Suzuki, D.他
  • Journal Title: The Astrophysical Journal Volume: 833 Pages: 145-145
  • DOI: 10.3847/1538-4357/833/2/145
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Campaign 9 of theK2Mission: Observational Parameters, Scientific Drivers, and Community Involvement for a Simultaneous Space- and Ground-based Microlensing Survey (2016)
  • Author(s): Henderson, Calen B.他
  • Journal Title: Publications of the Astronomical Society of the Pacific Volume: 128 Pages: 124401-124401
  • DOI: 10.1088/1538-3873/128/970/124401
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Massive black hole search by MOA (2019)
  • Author(s): 阿部文雄
  • Organizer: 23rd International Microlensing Conference
  • Int'l Joint Research
• [Presentation] MOA 望遠鏡を用いた大質量ブラックホールの探索 (2018)
  • Author(s): 宗像恒
  • Organizer: 日本天文学会2018年秋季年会
• [Presentation] Follow-up observations of GW events and search for black holes by MOA (2018)
  • Author(s): 阿部文雄
  • Organizer: The Second Annual Area Symposium of innovative area Gravitational wave physics and astronomy: nenesis
  • Int'l Joint Research
• [Presentation] Follow up observations with B&C telescope (2018)
  • Author(s): 亀井悠平
  • Organizer: The Second Annual Area Symposium of innovative area Gravitational wave physics and astronomy: nenesis
  • Int'l Joint Research
• [Presentation] Gravitational wave followup by the MOA collaboration (2018)
  • Author(s): Fumio Abe
  • Organizer: Microlensing 22
  • Int'l Joint Research
• [Presentation] Update on the MOA project (2018)
  • Author(s): Ian Bond
  • Organizer: Microlensing 22
  • Int'l Joint Research
• [Presentation] Using the MOA database and the eclipse time variation 27 Jan method (2018)
  • Author(s): Man Cheung Alex Li
  • Organizer: Microlensing 22
  • Int'l Joint Research
• [Presentation] Planet formation theory (2018)
  • Author(s): Daisuke Suzuki
  • Organizer: Microlensing 22
  • Int'l Joint Research
• [Presentation] MOA-2015-BLG-404 : 低質量星周りの巨大ガス惑星 (2018)
  • Author(s): 永金昌幸
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] 巨大ガス惑星に付随するスーパーネプチューンの衛星系、または褐色矮星連 星: MOA-2015-BLG-337 (2018)
  • Author(s): 宮崎翔太
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] 重力マイクロレンズ観測結果と惑星形成モデルとの比較 (2018)
  • Author(s): 鈴木大介
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] 低増光率マイクロレンズイベントにおける複数惑星系の初検出：OGLE-2014- BLG-1722 (2018)
  • Author(s): 鈴木大介
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] MOA グループによる重力波天体 GW170817/AT2017gfo の観測 (2018)
  • Author(s): 阿部文雄
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] LIGO O2におけるMOA望遠鏡を用いた重力波天体の探索 (2017)
  • Author(s): 朝倉悠一郎, MOA共同研究, J-GEM共同研究
  • Organizer: 日本天文学会２０１７年春季年会
  • Place of Presentation: 九州大学
  • Year and Date: 2017-03-15
• [Presentation] 重力マイクロレンズ天体の星像内のコンタミの確率のベイズ推定法の確立 (2017)
  • Author(s): 越本直季
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] Follow-up observations by MOA in LIGO O1 and prospect for O2 (2016)
  • Author(s): Abe, Fumio, MOA Collaboration
  • Organizer: Symposium on "New development in astrophysics through multimessenger observations of gravitational wave sources"
  • Place of Presentation: YITP, Kyoto University
  • Year and Date: 2016-12-26
  • Int'l Joint Research
• [Presentation] EM follow-up observation with MOA telescope (2016)
  • Author(s): Yuichiro, Asakura, MOA Collaboration
  • Organizer: Symposium on "New development in astrophysics through multimessenger observations of gravitational wave sources"
  • Place of Presentation: YITP, Kyoto University
  • Year and Date: 2016-12-26
  • Int'l Joint Research
• [Presentation] MOA望遠鏡を使った重力波フォローアップシステムの開発及び運用 (2016)
  • Author(s): 朝倉悠一郎, MOA共同研究, J-GEM共同研究
  • Organizer: 日本天文学会２０１６年秋季年会
  • Place of Presentation: 愛媛大学
  • Year and Date: 2016-09-14
• [Book] 天文月報第１１０号第３巻２２７ページ「重力レンズとアマチュア」 (2017)
  • Author(s): 阿部 文雄
  • Total Pages: 7
  • Publisher: 日本天文学会
• [Remarks] Microlansing Observations in Astrophysics
  • URL: http://www.phys.canterbury.ac.nz/moa/
• [Remarks] Microlensing Observations in Astrophysics
  • URL: http://www.phys.canterbury.ac.nz/moa/
• [Remarks] MOA, Microlensing Observations in Astrophysics
  • URL: http://www.phys.canterbury.ac.nz/moa/