April 10, 2026
Juan Ignacio Espinoza Retamal, a native of Constitución and former student of the Pontifical Catholic University of Chile, is the second Chilean to receive the 51 Pegasi b Fellowship and the first to do so after completing his entire education in Chile.
The astrophysicist was awarded this highly competitive international astronomy fellowship in the United States. This not only puts him at the forefront of global research but also marks a milestone for Chilean science.
In a highly competitive global environment, where access to funding and networks of excellence is crucial, receiving this grant is a significant honor. Sponsored by the Heising-Simons Foundation, the initiative selects researchers with leadership potential and provides them with resources to pursue independent, high-impact research agendas.
This program contemplates around 450.000 US to finance research during 3 years -With the possibility of extending it for 1 more year-, in addition to mentoring, access to international collaboration networks, and meetings with leading scientists in the field, it has established itself as a platform for scientific outreach with a global reach.
This distinction acquires special relevance for him in the second place: as a Chilean receiving this honor, following the Astronomer Teresa Paneque, and as the first to do so after completing his entire education in Chile.
“I am extremely happy to know that all the work I’ve been doing is finally paying off. This is an extremely competitive fellowship, and all current and past fellows are leaders in their respective fields and conduct cutting-edge research. It is an honor for me to be a part of this,” he said.
“I also feel that this is not only a personal milestone, but a big victory for the entire astronomical community in Chile, because even in all these difficulties, in our country we make high-quality science,” he said.
Having recently earned his Ph.D. in Astrophysics from the University of Chile (UC) in 2025, Espinoza was part of the largest cohort of Ph.D. graduates ever recorded in Chile—207—a milestone that reflects the consolidation and sustained growth of doctoral education in the country.
At the same ceremony, he was awarded the Prize for Excellence in Doctoral Theses for his research titled “Constraining the Flatness of Planetary Systems,” which focuses on the origin and evolution of exoplanets, as well as the configuration and dynamics of planetary systems beyond the Solar System.
Regarding his education, the researcher highlighted the Pontifical Catholic University of Chile as a key platform for his academic development.
“The university gave me all the necessary tools for my research. I always felt supported by my professors. The department of Astrophysics in the UC reunites first-level researchers, who made me able to connect with people outside the country, from whom I’ve learned a lot,” he said.
His current research focuses on exoplanetary systems, measuring how aligned or misaligned they are with respect to the rotation of their stars.
“To do this, I use data collected with some of the most precise instruments in the world, such as the ESPRESSO spectrographs on the VLT in Chile, the Planet Finder Spectrograph on the Magellan telescopes, and NEID on the WIYN telescope in Arizona. Based on these measurements, we can understand the physical processes that gave rise to these systems,” he explained.
The Pontifical Catholic University of Chile highlights the quality and caliber of its doctoral students. This was noted by Diego Cosmelli, director of the UC Graduate School.
Juan Ignacio Espinoza has received a highly prestigious international award, cementing a career marked by talent, excellence, and scientific dedication. His achievement is a source of great pride and places him among the elite of the global astronomy research community. Likewise, this milestone reflects the high caliber of doctoral students at the Pontifical Catholic University of Chile, who continue to conduct outstanding research, generate high-impact knowledge, and project it beyond the country’s borders.
The recognition also sparked reactions within the scientific community. On social media, astronomer Teresa Paneque celebrated the milestone:
“I’m so happy because there’s a Chilean—now there are two of us (…) I love seeing that more and more Latin Americans are winning these awards and doing world-class science.”
Looking ahead, the scientist aims to continue pushing the limits of current instrumentation to study systems with increasingly smaller planets in greater detail.
Lastly, he leaves a message for those who want to follow the science path:
“The sciences and astronomy in particular are a good option for those who have the curiosity to know how the world works. Today, Chile is one of the world’s leading centers of astronomy, and the field has a bright future. I urge the authorities to protect the country’s skies, which are unique in the world and serve as our window to the universe, and to invest more in science. There is a lot of talent in Chile, but more support is needed,” he emphasized.
Currently, the researcher is conducting his work at Princeton University, where he will continue his research on exoplanets thanks to this fellowship, consolidating studies on the architecture of planetary systems from both observational and theoretical perspectives.
Beyond its scientific impact, this recognition reflects the growing international prominence of science conducted in Chile and the increasingly solid presence of its researchers in the world’s leading research centers.