Japan's gravity wave tracking observation team J-GEM observes the gravity wave source "GW170817" observed by the gravity wave telescopes "LIGO" (USA) and "Virgo" (Europe), and the visible and infrared compatible celestial bodies of the gravity wave source. For the first time, I succeeded in tracking the change in brightness over time.The observation team consists of Hiroshima University, National Astronomical Observatory, Konan University, Kagoshima University, Nagoya University, and the University of Tokyo.

 The gravitational wave predicted by Einstein in 1916 is a phenomenon in which the distortion of space due to gravity is transmitted at the speed of light. It was first directly observed by LIGO in 2015, and the 2017 Nobel Physics Award was awarded for this achievement.However, it was unclear which celestial body emitted it only by gravitational wave observation.

 Neutron stars are high-density objects with a radius of about 10 kilometers (density is 1 billion tons per cubic centimeter), and unlike the case of black hole coalescence, when neutron stars coalesce, electromagnetic radiation of various wavelengths was expected. ..

 On August 2017, 8, the LIGO / Virgo joint team observed gravitational waves due to neutron star mergers.Immediately passed on to more than 17 observatories around the world. Eleven hours later, several telescopes discovered a celestial body (SSS70a) corresponding to gravitational waves.

Approximately 17 hours after gravity wave detection, Hawaii's Subaru Telescope (National Astronomical Observatory), New Zealand's MOA-II Telescope (Nagoya University, Osaka University) and B & C Telescope (Canterbury University), South Africa's IRSF Telescope (Nagoya University, Kagoshima University), We carried out optical infrared tracking observations with a group of telescopes in Japan, and succeeded in tracking the dimming of near infrared rays for 15 consecutive days.

This observation result is attributed to the electromagnetic radiation phenomenon "Kilonova" accompanied by the "r process", which is one of the processes for synthesizing elements heavier than iron (gold, platinum, rare earth, etc.). It is taken as a step.

Nagoya University

Aiming to be a person who has true courage and intellect and can open up the future

Nagoya University is a comprehensive university with 9 faculties, 13 graduate schools, 3 affiliated research institutes, nationwide joint usage, and 5 joint research centers.Through creative research activities, he explores the truth and produces some of the best intellectual achievements in the world.Foster courageous intellectuals with abundant logical thinking and imagination through educational practices that emphasize spontaneity […]

Hiroshima University

Learning to design your own life.To the world's top 100 universities that create knowledge

Under the five principles of "spirit of seeking peace," "creation of new knowledge," "education that cultivates abundant humanity," "coexistence with local and international communities," and "continuous self-transformation," 5 faculties and 12 studies A comprehensive research university with a department.While promoting university reform with both educational and research capabilities, we will continuously produce global human resources and gain knowledge […]

Konan University

The talent of each person is in full bloom.Campus where you can connect with people and grow your personality

Konan University promotes "small-group education" that leverages the strengths of medium-sized comprehensive universities.We are practicing unique initiatives such as a learning portfolio that firmly grasps and evaluates the individuality of each student and the KONAN Certificate System.In addition, advanced robot development and close contact with local Kobe […]

Kagoshima University

Aiming to become a glocal education and research center that flies from southern Kyushu to the world

Kagoshima University has nine faculties and nine graduate schools, with approximately 9 undergraduate students and approximately 9 graduate students (including approximately 9,000 international students), for a total of approximately 2,000 students.We strive to discover the potential of each student and to develop their aptitude, and provide a wide range of liberal arts education and advanced specialized education, as well as […].

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