Searching for Close Binary System in Milky Way Galaxy for Potential Gravitational Wave Sources

• Project Area: Gravitational wave physics and astronomy: Genesis
• Project/Area Number: 20H04730
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: 鈴木 尚孝 東京大学, カブリ数物連携宇宙研究機構, 客員准科学研究員 (20722804)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 重力波 / 近接連星 / 白色矮星 / Ia型超新星 / 暗黒エネルギー / 背景重力波 / 連星 / ブラックホール / 中性子星

Outline of Research at the Start

アインシュタインが予言した重力波は、はじめて2015年に観測されました。これまでブラックホールの衝突合体や、中性子星の連星合体からの重力波が観測されていますが、近接連星と呼ばれる連星系からも微弱ながら重力波で放出されていることが知られています。天の川銀河の星々のスペクトルの視線速度の変化から近接連星候補の国勢調査を行い、連星系からの背景重力波の大きさを本研究では推定します。

Outline of Annual Research Achievements

本研究では、天の川銀河系内で重力波源となりうる白色矮星を含む近接連星を統計的に探し出すことである。近接連星は、微弱ながら重力波を放出することが知られており、将来のスペースからの重力波観測を立案する上でも、どれくらいの数の近接連星が天の川銀河に存在するかを知ることは重要である。また、白色矮星連星は、暗黒エネルギーの精密測定に使われているIa型超新星の母天体と考えられているが、白色矮星同士の連星なのか、白色矮星と主系列星の連星なのか、数十年に渡って議論され、決着がついていない。天の川銀河内で、母天体候補を探し出し統計的分布の知見を得ることが肝要である。
本研究では、まず候補天体リスト作成し、分光による追観測の遂行、データを解析し、近接連星の確認をしていく。これまで蓄積されたスローンデジタルスカイサーベイ（SDSS)から候補天体絞り出し、欧州の位置天文衛星GAIAのDR３のデータと照合し、連星の軌道半径の大きいもの(1000天文単位）から、小さい方向への分布を調査し、近接連星の分布について、推定した。また、Pan-Starrs、DECamの最新のデータとも組み合わせ、候補天体リストを作成した。確度の高い天体については、分光観測で確かめる予定であったが、新型コロナ感染症の影響により、望遠鏡が稼働していなかった時期があり、また天候にも恵まれず、観測計画は遅れているが、いくつかの有力天体については分光観測することができた。今期は１６晩、来期は１０晩観測時間を獲得し、観測を継続し、解析の上結果を論文化し、データを公開して行く予定である。

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Lawrence Berkeley National Lab(米国)
• [Int'l Joint Research] LPNHE(フランス)
• [Int'l Joint Research] Australia National University(オーストラリア)
• [Int'l Joint Research] Lawrence Berkeley National Laboratory/University of California, Berkeley(米国)
• [Journal Article] Bump Morphology of the CMAGIC Diagram (2023)
  • Author(s): Aldoroty L.、Wang L.、Hoeflich P.、Yang J.、Suntzeff N.、Perlmutter S.、Ponder K. A.、Rabinowitz D.、Rigault M.、Rubin D.、Runge K.、Saunders C.、Smadja G.、Suzuki N. et al.
  • Journal Title: The Astrophysical Journal Volume: 948 Issue: 1 Pages: 10-10
  • DOI: 10.3847/1538-4357/acad78
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Second Data Release of the COSMOS Lyα Mapping and Tomography Observations: The First 3D Maps of the Detailed Cosmic Web at 2.05 < z < 2.55 (2022)
  • Author(s): Horowitz Benjamin、Lee Khee-Gan、Ata Metin、Meller Thomas、Krolewski Alex、Prochaska J. Xavier、Hennawi Joseph F.、White Martin、Schlegel David、Rich R. Michael、Nugent Peter E.、Suzuki Nao、Kashino Daichi、Koekemoer Anton M.、Lemaux Brian C.
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 263 Issue: 2 Pages: 27-27
  • DOI: 10.3847/1538-4365/ac982d
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Uniform Recalibration of Common Spectrophotometry Standard Stars onto the CALSPEC System Using the SuperNova Integral Field Spectrograph (2022)
  • Author(s): Rubin David、Aldering G.、Antilogus P.、Aragon C.、Bailey S.、Baltay C.、Bongard S.、Boone K.、Buton C.、Copin Y.、Dixon S.、Fouchez D.、Gangler E.、Gupta R.、Hayden B.、Hillebrandt W.、Kim A. G.、Kowalski M.、Nordin J.、Pain R.、Perlmutter S.、Suzuki N. et al.
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 263 Issue: 1 Pages: 1-1
  • DOI: 10.3847/1538-4365/ac7b7f
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Conceptual design of the Keck Wide Field Imager (KWFI) (2022)
  • Author(s): Radovan Matthew V.、Bertz Robert、Cooke Jeff、Dekany Richard、Delacroix Alex、Fucik Jason R.、Gillingham Peter R.、Krishnan Shanti、Poole Gregory、Seikel Ray、Smith Roger、Suzuki Nao、Travouillon Tony
  • Journal Title: SPIE Volume: 12184 Pages: 20-20
  • DOI: 10.1117/12.2630502
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A Probabilistic Autoencoder for Type Ia Supernova Spectral Time Series (2022)
  • Author(s): Stein George、Seljak Uros、Aldering G.、Bongard S.、Boone K.、Buton C.、Karmen M.、Kim A. G.、Kowalski M.、Kesters D.、Leget P.-F.、Mondon F.、Nordin J.、Pain R.、Pecontal E.、Pereira R.、Perlmutter S.、Ponder K. A.、Rigault M.、Rubin D.、Saunders C.、Smadja G.、Suzuki N. et al.
  • Journal Title: The Astrophysical Journal Volume: 935 Issue: 1 Pages: 5-5
  • DOI: 10.3847/1538-4357/ac7c08
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063 (2022)
  • Author(s): Jiang Ji-an、Yasuda Naoki、Maeda Keiichi、Tominaga Nozomu、Doi Mamoru、Yoachim Peter、Uno Kohki、Moriya Takashi J.、Kumar Brajesh、Pan Yen-Chen、Tanaka Masayuki、Tanaka Masaomi、Nomoto Ken’ichi、Jha Saurabh W.、Ruiz-Lapuente Pilar、Jones David、Shigeyama Toshikazu、Suzuki Nao et al.
  • Journal Title: The Astrophysical Journal Letters Volume: 933 Issue: 2 Pages: L36-L36
  • DOI: 10.3847/2041-8213/ac7390
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Third data release of the Hyper Suprime-Cam Subaru Strategic Program (2022)
  • Author(s): Aihara Hiroaki et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 74 Issue: 2 Pages: 247-272
  • DOI: 10.1093/pasj/psab122
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program (2021)
  • Author(s): Tang S.、Silverman J.D.、Ding X.、Li J.、Lee K.-G.、Strauss M.A.、Goulding A.、Schramm M.、Kawinwanichakij L.、Xavier P.J.、Hennawi J.F.、Imanishi M.、Iwasawa K.、Toba Y.、Kayo I.、Oguri M.、Matsuoka Y.、Onoue M.、Jahnke K.、Ichikawa K.、Hartwig T.、Kashikawa N.、Kawaguchi Toshihiro、et al.
  • Journal Title: The Astrophysical Journal Volume: 922 Issue: 1 Pages: 83-83
  • DOI: 10.3847/1538-4357/ac1ff0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing Feedback via IGM tomography and the Lyα Forest with Subaru PFS, TMT/ELT, and JWST (2021)
  • Author(s): Nagamine Kentaro、Shimizu Ikkoh、Fujita Katsumi、Suzuki Nao、Lee Khee-Gan、Momose Rieko、Mukae Shiro、Liang Yongming、Kashikawa Nobunari、Ouchi Masami、Silverman John D.
  • Journal Title: The Astrophysical Journal Volume: 914 Issue: 1 Pages: 66-66
  • DOI: 10.3847/1538-4357/abfa16
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The HST See Change Program. I. Survey Design, Pipeline, and Supernova Discoveries* (2021)
  • Author(s): Hayden Brian、Rubin David、Boone Kyle et al.
  • Journal Title: The Astrophysical Journal Volume: 912 Issue: 2 Pages: 87-87
  • DOI: 10.3847/1538-4357/abed4d
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Twins Embedding of Type Ia Supernovae. II. Improving Cosmological Distance Estimates (2021)
  • Author(s): Boone K.、Aldering G.、Antilogus P.、Aragon C.、Bailey S. et al.
  • Journal Title: The Astrophysical Journal Volume: 912 Issue: 1 Pages: 71-71
  • DOI: 10.3847/1538-4357/abec3b
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Twins Embedding of Type Ia Supernovae. I. The Diversity of Spectra at Maximum Light (2021)
  • Author(s): Boone K.,Aldering G.,Antilogus P.,Aragon C.,Bailey S et al.
  • Journal Title: The Astrophysical Journal Volume: 912 Issue: 1 Pages: 70-70
  • DOI: 10.3847/1538-4357/abec3c
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Constraints on the Rate of Supernovae Lasting for More Than a Year from Subaru/Hyper Suprime-Cam (2021)
  • Author(s): Moriya Takashi J.、Jiang Ji-an、Yasuda Naoki、Kokubo Mitsuru、Kawana Kojiro、Maeda Keiichi、Pan Yen-Chen、Quimby Robert M.、Suzuki Nao、Takahashi Ichiro、Tanaka Masaomi、Tominaga Nozomu、Nomoto Ken’ichi、Cooke Jeff、Galbany Lluis、Gonzalez-Gaitan Santiago、Lee Chien-Hsiu、Pignata Giuliano
  • Journal Title: The Astrophysical Journal Volume: 908 Issue: 2 Pages: 249-249
  • DOI: 10.3847/1538-4357/abcfc0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Photometric classification of Hyper Suprime-Cam transients using machine learning (2020)
  • Author(s): Takahashi Ichiro、Suzuki Nao、Yasuda Naoki、Kimura Akisato、Ueda Naonori、Tanaka Masaomi、Tominaga Nozomu、Yoshida Naoki
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 5 Pages: 22-22
  • DOI: 10.1093/pasj/psaa082
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Dual Supermassive Black Holes at Close Separation Revealed by the Hyper Suprime-Cam Subaru Strategic Program (2020)
  • Author(s): Silverman J.D., Tang S., Lee K.-G., T. Hartwig, A. Goulding, M.A. Strauss, M. Schramm, X. Ding, R. Riffel, S. Fujimoto, C. Hikage, M. Imanishi, K. Iwasawa, K. Jahnke, I. Kayo, N. Kashikawa, T. Kawaguchi, 他16名
  • Journal Title: The Astrophysical Journal Volume: 899 Issue: 2 Pages: 154-154
  • DOI: 10.3847/1538-4357/aba4a3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Three-dimensional Distribution Map of H i Gas and Galaxies around an Enormous Lyα Nebula and Three QSOs at z = 2.3 Revealed by the H i Tomographic Mapping Technique (2020)
  • Author(s): Mukae S., Ouchi M., Cai Z., Lee K-G., and 20 coauthors including Suzuki, Nao
  • Journal Title: The Astrophysical Journal Volume: 896 Issue: 1 Pages: 45-45
  • DOI: 10.3847/1538-4357/ab8db7
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The SNEMO and SUGAR Companion Data Sets (2020)
  • Author(s): Aldering G.、Antilogus P.、Aragon C. and 41 coauthors including Suzuki, Nao
  • Journal Title: Research Notes of the AAS Volume: 4 Issue: 5 Pages: 63-63
  • DOI: 10.3847/2515-5172/ab8fa5
  • Open Access / Int'l Joint Research
• [Journal Article] Strong dependence of Type Ia supernova standardization on the local specific star formation rate (2020)
  • Author(s): Rigault M., Brinnel V., Aldering G., Antilogus P. and 39 coauthors including Suzuki, Nao
  • Journal Title: Astronomy & Astrophysics Volume: 644 Pages: 176-176
  • DOI: 10.1051/0004-6361/201730404
  • Peer Reviewed / Open Access / Int'l Joint Research