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Title: Subaru Hyper Suprime-Cam Survey for an Optical Counterpart of GW170817

Here, we perform a z-band survey for an optical counterpart of the binary neutron star coalescence GW170817 with Subaru/Hyper Suprime-Cam. Our untargeted transient search covers 23.6 deg2 corresponding to the 56.6% credible region of GW170817 and reaches the 50% completeness magnitude of 20.6 mag on average. As a result, we find 60 candidate extragalactic transients, including J-GEM17btc (also known as SSS17a/DLT17ck). While J-GEM17btc is associated with NGC 4993, which is firmly located inside the 3D skymap of GW170817, the other 59 candidates do not have distance information in the GLADE v2 catalog or NASA/IPAC Extragalactic Database. Among 59 of the candidates, 58 are located at the center of extended objects in the Pan-STARRS1 catalog, while one candidate has an offset. We present location, z-band apparent magnitude, and time variability of the candidates and evaluate the probabilities that they are located within the 3D skymap of GW170817. The probability for J-GEM17btc is 64%, which is much higher than for the other 59 candidates (9.3 × 10 –3 – 2.1 × 10 –1%). Here, the possibility that at least one of the other 59 candidates is located within the 3D skymap is only 3.2%. Therefore, we conclude that J-GEM17btc is the mostmore » likely and distinguished candidate to be the optical counterpart of GW170817.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [2] ;  [6] ;  [6] ;  [2] ;  [7] ;  [6] ;  [3] ;  [3] ;  [8] ;  [6] ;  [9] ;  [2] ;  [9] ;  [10] more »;  [11] ;  [12] ;  [13] ;  [14] ;  [13] ;  [15] ;  [6] ;  [16] ;  [17] ;  [16] ;  [13] ;  [18] ;  [16] ;  [19] « less
  1. Department of Physics, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Kobe, Hyogo 658-8501, Japan; Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, 5-1-5 Kashiwa, Chiba 277-8583, Japan
  2. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
  3. Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
  4. Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan; Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
  5. Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, 5-1-5 Kashiwa, Chiba 277-8583, Japan
  6. Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, HI 96720, USA
  7. Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
  8. Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  9. Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8601, Japan
  10. South African Astronomical Observatory, PO Box 9, 7935 Observatory, Cape Town, South Africa
  11. Institute for Natural and Mathematical Sciences, Massey University, Private Bag 102904 North Shore Mail Centre, Auckland 0745, New Zealand
  12. The Research Institute for Time Studies, Yamaguchi University, Yoshida 1677-1, Yamaguchi, Yamaguchi 753-8511, Japan
  13. Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, 407-2 Nishigaichi, Sayo, Hyogo 679-5313, Japan
  14. Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  15. Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
  16. Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonake, Osaka 560-0043, Japan
  17. Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232, Japan
  18. Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan; Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan
  19. University of Canterbury, Mt John Observatory, PO Box 56, Lake Tekapo 7945, New Zealand
Publication Date:
Grant/Contract Number:
AC02-76SF00515; JP17H06363; JP15H00788; JP24103003; JP10147214; JP10147207; JP16H02183; JP15H02075; JP26800103; JP25800103; D11-R-0830
Type:
Accepted Manuscript
Journal Name:
Publications of the Astronomical Society of Japan
Additional Journal Information:
Journal Volume: 70; Journal Issue: 2; Journal ID: ISSN 0004-6264
Publisher:
Astronomical Society of Japan
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
The J-GEM Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; nuclear reactions; nucleosynthesis; abundances; gravitational waves; surveys; stars; neutron
OSTI Identifier:
1458423

Tominaga, Nozomu, Tanaka, Masaomi, Morokuma, Tomoki, Utsumi, Yousuke, Yamaguchi, Masaki S., Yasuda, Naoki, Tanaka, Masayuki, Yoshida, Michitoshi, Fujiyoshi, Takuya, Furusawa, Hisanori, Kawabata, Koji S., Lee, Chien-Hsiu, Motohara, Kentaro, Ohsawa, Ryou, Ohta, Kouji, Terai, Tsuyoshi, Abe, Fumio, Aoki, Wako, Asakura, Yuichiro, Barway, Sudhanshu, Bond, Ian A., Fujisawa, Kenta, Honda, Satoshi, Ioka, Kunihito, Itoh, Youichi, Kawai, Nobuyuki, Kim, Ji Hoon, Koshimoto, Naoki, Matsubayashi, Kazuya, Miyazaki, Shota, Saito, Tomoki, Sekiguchi, Yuichiro, Sumi, Takahiro, and Tristram, Paul J.. Subaru Hyper Suprime-Cam Survey for an Optical Counterpart of GW170817. United States: N. p., Web. doi:10.1093/pasj/psy007.
Tominaga, Nozomu, Tanaka, Masaomi, Morokuma, Tomoki, Utsumi, Yousuke, Yamaguchi, Masaki S., Yasuda, Naoki, Tanaka, Masayuki, Yoshida, Michitoshi, Fujiyoshi, Takuya, Furusawa, Hisanori, Kawabata, Koji S., Lee, Chien-Hsiu, Motohara, Kentaro, Ohsawa, Ryou, Ohta, Kouji, Terai, Tsuyoshi, Abe, Fumio, Aoki, Wako, Asakura, Yuichiro, Barway, Sudhanshu, Bond, Ian A., Fujisawa, Kenta, Honda, Satoshi, Ioka, Kunihito, Itoh, Youichi, Kawai, Nobuyuki, Kim, Ji Hoon, Koshimoto, Naoki, Matsubayashi, Kazuya, Miyazaki, Shota, Saito, Tomoki, Sekiguchi, Yuichiro, Sumi, Takahiro, & Tristram, Paul J.. Subaru Hyper Suprime-Cam Survey for an Optical Counterpart of GW170817. United States. doi:10.1093/pasj/psy007.
Tominaga, Nozomu, Tanaka, Masaomi, Morokuma, Tomoki, Utsumi, Yousuke, Yamaguchi, Masaki S., Yasuda, Naoki, Tanaka, Masayuki, Yoshida, Michitoshi, Fujiyoshi, Takuya, Furusawa, Hisanori, Kawabata, Koji S., Lee, Chien-Hsiu, Motohara, Kentaro, Ohsawa, Ryou, Ohta, Kouji, Terai, Tsuyoshi, Abe, Fumio, Aoki, Wako, Asakura, Yuichiro, Barway, Sudhanshu, Bond, Ian A., Fujisawa, Kenta, Honda, Satoshi, Ioka, Kunihito, Itoh, Youichi, Kawai, Nobuyuki, Kim, Ji Hoon, Koshimoto, Naoki, Matsubayashi, Kazuya, Miyazaki, Shota, Saito, Tomoki, Sekiguchi, Yuichiro, Sumi, Takahiro, and Tristram, Paul J.. 2018. "Subaru Hyper Suprime-Cam Survey for an Optical Counterpart of GW170817". United States. doi:10.1093/pasj/psy007. https://www.osti.gov/servlets/purl/1458423.
@article{osti_1458423,
title = {Subaru Hyper Suprime-Cam Survey for an Optical Counterpart of GW170817},
author = {Tominaga, Nozomu and Tanaka, Masaomi and Morokuma, Tomoki and Utsumi, Yousuke and Yamaguchi, Masaki S. and Yasuda, Naoki and Tanaka, Masayuki and Yoshida, Michitoshi and Fujiyoshi, Takuya and Furusawa, Hisanori and Kawabata, Koji S. and Lee, Chien-Hsiu and Motohara, Kentaro and Ohsawa, Ryou and Ohta, Kouji and Terai, Tsuyoshi and Abe, Fumio and Aoki, Wako and Asakura, Yuichiro and Barway, Sudhanshu and Bond, Ian A. and Fujisawa, Kenta and Honda, Satoshi and Ioka, Kunihito and Itoh, Youichi and Kawai, Nobuyuki and Kim, Ji Hoon and Koshimoto, Naoki and Matsubayashi, Kazuya and Miyazaki, Shota and Saito, Tomoki and Sekiguchi, Yuichiro and Sumi, Takahiro and Tristram, Paul J.},
abstractNote = {Here, we perform a z-band survey for an optical counterpart of the binary neutron star coalescence GW170817 with Subaru/Hyper Suprime-Cam. Our untargeted transient search covers 23.6 deg2 corresponding to the 56.6% credible region of GW170817 and reaches the 50% completeness magnitude of 20.6 mag on average. As a result, we find 60 candidate extragalactic transients, including J-GEM17btc (also known as SSS17a/DLT17ck). While J-GEM17btc is associated with NGC 4993, which is firmly located inside the 3D skymap of GW170817, the other 59 candidates do not have distance information in the GLADE v2 catalog or NASA/IPAC Extragalactic Database. Among 59 of the candidates, 58 are located at the center of extended objects in the Pan-STARRS1 catalog, while one candidate has an offset. We present location, z-band apparent magnitude, and time variability of the candidates and evaluate the probabilities that they are located within the 3D skymap of GW170817. The probability for J-GEM17btc is 64%, which is much higher than for the other 59 candidates (9.3 × 10–3 – 2.1 × 10–1%). Here, the possibility that at least one of the other 59 candidates is located within the 3D skymap is only 3.2%. Therefore, we conclude that J-GEM17btc is the most likely and distinguished candidate to be the optical counterpart of GW170817.},
doi = {10.1093/pasj/psy007},
journal = {Publications of the Astronomical Society of Japan},
number = 2,
volume = 70,
place = {United States},
year = {2018},
month = {2}
}