28 July 2020

AAS Names Paul Demorest as Fred Kavli Plenary Lecturer


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Paul B. DemorestWith support from the Kavli Foundation, the Vice-Presidents of the American Astronomical Society (AAS) invite a distinguished scientist to kick off each semiannual AAS meeting with a presentation on recent research of great importance. At the 237th AAS meeting, to be held virtually in January 2021, the Fred Kavli Plenary Lecture will be given by Paul B. Demorest, Scientist and Group Lead for VLA/VLBA Science Support at the US National Radio Astronomy Observatory (NRAO) in Socorro, New Mexico.

Demorest is a leader in NANOGrav, the North American Nanohertz Observatory for Gravitational Waves. This American-Canadian project aims to detect very-low-frequency gravitational radiation from a variety of cosmic sources, including binary supermassive black holes orbiting each other in the centers of galaxies. The Laser Interferometer Gravitational-wave Observatory (LIGO) in the United States and its counterpart Virgo in Italy are sensitive to high-frequency waves from merging stellar-mass black holes and neutron stars. They can’t sense the lazy ripples in space-time caused by the slow dance of more massive and more widely separated black holes.

The NANOGrav project relies on data from some of the world’s most advanced existing radio telescopes. These measure the arrival times of radio waves from millisecond pulsars — rapidly spinning, highly magnetized neutron stars that beam radio signals into space. When one of these pulsars is oriented just right, we see pulses of radio emission hundreds of times each second as the star’s dizzying rotation repeatedly sweeps its beam across Earth. Millisecond pulsars keep time almost as accurately as atomic clocks. By monitoring dozens of them throughout our galaxy, NANOGrav — a so-called pulsar timing array — will detect the rhythmic slowing down and speeding up of pulses when passing low-frequency gravitational waves alternately stretch and compress the fabric of space-time. This essentially turns the entire Milky Way galaxy into a gravitational-wave detector.

In his Kavli lecture on Monday, 11 January 2021, Demorest will describe how NANOGrav came about, review the project’s observations and lessons learned during its first decade, detail the steps he and his colleagues are taking to expand the telescope network and enhance its sensitivity, discuss the specific types of objects and phenomena NANOGrav is designed to explore, and explain why the collaboration anticipates detecting their first gravitational-wave signal within the next decade.

“I was surprised and thrilled when the AAS invited me to give the Kavli lecture,” says Demorest. “Every astronomer knows that whenever we open a new window on the universe, we make discoveries beyond our imagination. I look forward to sharing the excitement all of us on the project are experiencing as we get close to making observations of gravitational waves from supermassive black holes a regular occurrence.”

Demorest earned his bachelor’s degree (2000), master’s degree (2002), and PhD (2007) in physics at the University of California, Berkeley. He then spent three years on a Jansky Fellowship at the National Radio Astronomy Observatory (NRAO) in Charlottesville, Virginia, after which he took a position there as Senior Research Associate. He became an NRAO staff scientist in 2011 and, in 2014, relocated to New Mexico, home to the Very Large Array (VLA) and Very Long Baseline Array (VLBA). He is a member of both the NANOGrav and International Pulsar Timing Array collaborations and has nearly 100 peer-reviewed publications to his credit.

“We’re proud that the AAS has selected Dr. Demorest for this prestigious award,” said NRAO Director Tony Beasley. “Paul is one of our leading experts in pulsar science and observational techniques, and his efforts on NANOGrav have brought that partnership to the important point they now have reached.”

The AAS is delighted to honor Dr. Paul B. Demorest with the January 2021 Fred Kavli Plenary Lectureship.


Rick Fienberg
AAS Press Officer
+1 857-891-5649
Joan Schmelz
AAS Senior Vice-President
Universities Space Research Association

Image (504 KB JPG, 1000 x 1500 pixels):
Radio astronomer Paul B. Demorest, Associate Scientist at the US National Radio Astronomy Observatory in Socorro, New Mexico, will give the Fred Kavli Plenary Lecture at the 237th meeting of the American Astronomical Society, to be held virtually, on 11 January 2021. In his talk he’ll provide an update on NANOGrav, the North American Nanohertz Observatory for Gravitational Waves. Credit: Dave Finley/NRAO.

NRAO's version of this press release:

The Kavli Foundation, established in December 2000 by Fred Kavli, a California business leader and philanthropist, is dedicated to advancing science for the benefit of humanity, promoting public understanding of scientific research, and supporting scientists and their work. The foundation's mission is implemented through an international program of research institutes, professorships, symposia, and other initiatives in the fields of astrophysics, nanoscience, neuroscience, and theoretical physics.

The American Astronomical Society (AAS), established in 1899, is the major organization of professional astronomers in North America. Its membership of more than 8,000 also includes physicists, mathematicians, geologists, engineers, and others whose research interests lie within the broad spectrum of subjects now comprising the astronomical sciences. The mission of the AAS is to enhance and share humanity’s scientific understanding of the universe, which it achieves through publishing, meeting organization, education and outreach, policy advocacy, and training and professional development.