Franck Marchis

Franck Marchis
Exoplanets Research Thrust Chair, Senior Scientist
Doctorat of Toulouse University
Major Awards: 

Recipient of one of the 2004 Grants in Honor of Professor Henri Chretien (AAS, September 2004)

In April 2007, the asteroid numbered 1989SO8 was named “(6639) Marchis” in honor of his work in the field of multiple asteroids.

Curriculum Vitae: 
Planetary Science, Astronomy, Instrumentation, Science Outreach
"Prediction is very difficult, especially if it's about the future. " Niels Bohr

Dr. Franck Marchis is a Principal Investigator at the Carl Sagan Center of the SETI Institute since July 2007. He joined the institute for a full time position in June 2011 after having a joint appointment with the department of astronomy of the University of California at Berkeley.

Over the past 15 years, he has dedicated his research to the study of our solar system using mainly ground-based telescopes equipped with adaptive optics. The solar system is characterized by considerable diversity of its constituent bodies. Franck Marchis’ first involvement in the study of this diversity started in 1996 while working at the UNAM Astronomy Department in Mexico City. He made the first ground-based observations of the volcanoes on the jovian moon Io, using the first Adaptive Optics (AO) systems available on the European Southern Observatory (ESO) 3.6 m telescope at Chile’s La Silla Observatory. After a brief stay in London and four years in Chile at ESO, he completed in 2000 his PhD in a French university (Toulouse III) even if he has conducted his research in these three countries. His doctoral research described the application of adaptive optics to the study of the solar system.

He continued this explorative work at U. C. Berkeley where he had the opportunity to use the W.M. Keck 10 m telescope and its revolutionary Laser Guide Star AO system. In collaborations with astronomers of the Observatoire de Paris, he searched for, and studied moons around asteroids. In 2005, this team discovered the first triple asteroidal system composed of Sylvia, a 280-km size irregular asteroid, surrounded by two kilometer-size satellites named Romulus and Remus. The existence of multiple asteroid systems provides direct clues about the collisional past of the solar system and the formation of major planets. The direct measurement of the bulk density of an asteroid available when the moon’s orbit is well constrained give indications about the composition and distribution of material in the asteroid. In 2006, his group published in Nature the first density measurement of a Jupiter Trojan asteroid (617) Patroclus, which is similar to the density of comets and icy outer asteroids. This work  implies that Trojan asteroids could be captured transneptunian objects due to the migration of the giant planets. 

More recently Franck has been also involved in the definition of new generation of AOs for 8 -10 m class telescopes and future Extremely Large Telescopes.  He has developed algorithms to process and enhance the quality  of images, both astronomical and biological, using fluorescence microscopy. His currently involved in the development of the Gemini Planet Imager, an extreme AO system for the Gemini South telescope which will be capable of imaging and record spectra of exoplanets orbiting around nearby stars.

His research involves both undergraduate and graduate students. Marchis is eager about contributing to the diversity of our science community and educating a new generation of researchers. 

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A new instrument that combines two high-resolution telescope techniques – adaptive optics and interferometry – has for the first time distinguished and studied the individual stars in a nearby binary star system, demonstrating promise for eventually picking out planets around other stars.

Gemini Planet Imager

The instrument, called the Gemini Planet Imager (GPI), was designed, built, and optimized for imaging faint planets next to bright stars and probing their atmospheres, and studying dusty disks around young stars. It is the most advanced such instrument to be deployed on one of the world’s biggest telescopes – the 8-meter Gemini South telescope in Chile.

Accurate Insights on Multiple Asteroid Systems: Shape, Bulk Density and Formation

We will conduct a robust and consistent observing program to gather detailed information of a large sample of known multiple asteroid systems.


A Study of Multiplicity in Small Solar System Bodies

A collaborative study of the satellites of asteroids using adaptive optics (AO). The orbits of binary systems are characterized and the internal structure of the asteroids inferred to help learn more about the proto-planetary environment.