An Indian-born astronomer has made headlines by being awarded the Royal Astronomical Society's (RAS) Gold Medal, a prestigious accolade in the realm of astronomy that dates back over two centuries. This award shines a spotlight on Professor Shrinivas Kulkarni's groundbreaking work in time-domain astronomy, illustrating the significant advancements he has contributed to our understanding of transient cosmic phenomena.
Based in the United States, Kulkarni's achievements place him alongside some of the greatest minds in science, including icons like Stephen Hawking, Jocelyn Bell Burnell, Albert Einstein, and Edwin Hubble. The recognition he receives from such a venerable institution emphasizes not just his individual contributions but also the transformative effects he has had on the field of astronomy.
Since 1985, Kulkarni has been serving as the George Ellery Hale Professor at Caltech, where he has made remarkable discoveries, including the identification of brown dwarfs and distant gamma-ray bursts. One of his most celebrated accomplishments—something he fondly recalls from his graduate days at UC Berkeley—is the discovery of the first millisecond pulsar, an achievement that filled him with excitement and kept him awake at night, demonstrating his passionate commitment to unraveling the mysteries of the universe.
In a groundbreaking moment for astrophysics, Kulkarni established in 1997 that gamma-ray bursts originate from beyond our galaxy, a revelation that significantly altered the landscape of astrophysical research. He is also known for spearheading initiatives like the Palomar Transient Factory (PTF) and the Zwicky Transient Facility (ZTF), both of which have transformed optical time-domain surveys. These facilities are capable of capturing thousands of cosmic events, such as supernovae and novae, every couple of nights from the renowned Palomar Observatory, fundamentally shifting how astronomers observe and study these fleeting occurrences in the Northern sky.
The citation from the RAS praises these innovative facilities for their role in "revolutionising time domain astrophysics," attributing their success to Kulkarni's development of advanced instruments, with ten having been constructed over several decades based on his philosophy of "build a big enough gizmo" to tackle complex astronomical challenges.
Recently, during the 2024 Watson Lecture at Caltech, he shared valuable insights gained from the ZTF project, melding his passion for exploring uncharted territories of the cosmos with his engineering skills. Expressing his surprise at receiving the award, Kulkarni acknowledged the impressive lineage of past recipients and extended his gratitude to his collaborators who contributed to the PTF and ZTF projects.
Having received the Shaw Prize in 2024, Kulkarni's academic journey began with a Master's degree from IIT Delhi in 1978, followed by a PhD from Berkeley in 1983. Currently, he is directing NASA's upcoming UVEX ultraviolet sky survey, set to launch in 2030, along with the Z-Shooter spectrometer for Keck Observatory, aiming to achieve its first light in 2029.
The RAS Gold Medals, which have been awarded annually since 1824, recognize excellence across various fields within astronomy and geophysics, celebrating a range of talents from research breakthroughs to educational outreach efforts. This year's medal for geophysics was awarded to Andrew Jackson of ETH Zurich, acknowledging his significant advances in geomagnetism.
Kulkarni’s remarkable achievements serve as an inspiration to the STEM community, particularly among India's diaspora, connecting his roots at IIT to the vast possibilities on the global stage, and paving the way for the next exciting chapter in time-domain astronomy.
