Drawing new insights from gravitational waves
Gravitational wave astronomy sheds light on supernova explosions
New information gleaned from gravitational wave observations is helping scientists understand what happens when massive stars die and transform into black holes.
Rochester Institute of Technology researcher Richard O’Shaughnessy and collaborators reanalyzed the merging black holes detected by LIGO (Laser Interferometer Gravitational Wave Observatory) on Dec. 26, 2016.
“Using essentially freshman physics, we drew new insights about the most violent events in the universe,” said O’Shaughnessy, an associate professor in RIT’s School of Mathematical Sciences. He is also researcher in RIT’s Center for Computational Relativity and Gravitation and a member of the LIGO Scientific Collaboration.
O’Shaughnessy presented his research findings at the American Astronomical Society meeting on June 5 in Austin, Texas. Physical Review Letters has accepted a paper co-authored by O’Shaughnessy, Davide Gerosa from Caltech and Daniel Wysocki from RIT.
The LIGO Scientific Collaboration cited O’Shaughnessy’s research in the paper announcing its third discovery of gravitational waves that published in Physical Review Letters on June 1.
The current study reanalyzed the binary black holes, known as GW151226. It has been the only time LIGO has reported binary black holes must be spinning, O’Shaughnessy said. LIGO’s previous measurements suggested that the larger mass orbited the other at a slightly tilted angle.
O’Shaughnessy and his team link the black hole’s misalignment to when it formed from the death of a massive star. The force of the stellar explosion and collapse expelled the newborn black hole with a “natal kick,” causing this misalignment, the authors suggest.
Natal kicks are thought to occur during the formation of neutron stars, which are created from the death of less massive stars than the progenitors of LIGO’s sources. O’Shaughnessy’s team suggests this phenomenon could also apply to binary black holes, which orbit each other.
“My collaborators and I tried to constrain the strength of these natal kicks based on LIGO’s observation,” O’Shaughnessy said. “If it formed from an isolated pairs of stars, we conclude strong black hole natal kicks were required. That’s an exciting challenge for models of how massive stars explode and collapse.”
Gerosa adds, “Our study corroborates years of tentative but suggestive evidence that black holes might have received these kicks. And with just one of LIGO’s observations, we learned something about how a star exploded billions of years ago. That’s the promise of gravitational wave astronomy in action.”
This research has been supported by the National Science Foundation and NASA.
Davide Gerosa is supported by NASA through Einstein Postdoctoral Fellowship grant No. PF6-170152 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. Any opinions, findings, and conclusions or recommendations expressed in this article are those of the author and do not necessarily reflect the views of the Smithsonian Astrophysical Observatory or the National Aeronautics Space Administration.
April 18, 2019
Imagine RIT visitors get to control RIT’s ‘Weather Machine’ in new two-story-high video game
Imagine RIT visitors will help keep the skies above RIT clear during the festival on April 27, in a new video game on display at the MAGIC Spell Studios building. Festivalgoers can play “Weather Defense: A Two Stories High Video Wall Game” on six large 4K displays, mounted two stories up the atrium wall of the new 52,000-square-foot MAGIC building.
April 18, 2019
Student Spotlight: Participating in the ASCE Concrete Canoe competition
Meet Brady Smith, a fourth-year civil engineering technology student and captain of this year’s Concrete Canoe team.
April 17, 2019
Imagine RIT Preview: Virtual Bugs
When the Seneca Park Zoo Society needed a way to create detailed 3D computer models of rare insects from Madagascar, they turned to RIT’s imaging science program for help. A multidisciplinary team of first-year students designed and built a new system to tackle the problem and will showcase the final product at the Imagine RIT festival.
April 17, 2019
RIT hosts 2019 Upstate NY Regional Student Conference on April 19 and 20 at Polisseni Center
Concrete canoes float—really. And bridges are more complicated to construct than putting up a few steel beams. Student-engineers who build both the unusual—yet attractive—canoes and complex bridge spans will display their designs at the 2019 Upstate New York Regional Student Conference taking place April 19-20 at RIT.