Multimessenger breakthrough: gravitational waves and light detected from the same event

 Multi-messenger Observations of a Binary Neutron Star Merger: The Astrophysical Journal Letters, Volume 848, Number 2

 

The LIGO and Virgo detectors – run by a collaboration of over 1000 members including a number from RIT's CCRG – have previously detected gravitational waves from several black hole mergers. Now for the first time, they have detected gravitational waves from a new source: the merger of two neutron stars. Being made of matter, unlike merging black holes, two neutron stars  will emit an abundance of light as and after they merge.

On August 17th, 2017, at 8:41am EST, the gravitational waves from this neutron star merger passed through the two LIGO and one Virgo detectors. Within two seconds, the Fermi space telescope observed a short burst of gamma rays – the most energetic form of light – which was later determined to have originated from the same area on the sky. Within hours, ground- and space-based telescopes were able to locate the light from the resulting explosion, narrowing it down to the galaxy NGC 4993, roughly 130 million light-years from Earth, in the constellation Hydra.

In the two months since this discovery, RIT's LIGO members have been hard at work with the rest of the 1000+ person collaboration in analyzing the data. RIT members include: faculty Hans-Peter Bischof, Manuela Campanelli, Carlos Lousto, Richard O'Shaughnessy, Rupal Mittal, John Whelan, and Yosef Zlochower; postdoctoral researcher James Healy; undergraduate students Matthew Delfavero and Monica Rizzo; graduate students John Bero, Brennan Ireland, Jacob Lange, Nicole Rosato, Jared Wofford, and Daniel Wysocki.

This detection marks the dawn of the era of multimessinger astronomy. Combining independent sources of information like this (e.g., light and gravitational waves) has with one event closed multiple open cosmic mysteries (the source of short gamma ray bursts and kilonovae, as well as the speed of gravity), and in the years and decades to come may close many more.

Video of press release

Official press release

RIT news article

LIGO detection page

Papers posted on announcement day

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