Welcome to the Planetary Research Laboratory

The Planetary Research Laboratory (PRL) is hosted within the Physics & Astronomy Department at San Francisco State University. Our research involves students at both the undergraduate and graduate level and includes a combination of observational and theoretical programs.

News from the Lab

2016-06-17: PRL graduate student, Alma Ceja, has been awarded an ARCS Scholarship. The ARCS Foundation provides scholarships to exceptional students to provide them with the needed support to help them grow in their scientific careers. Alma is studying anthropogenic effects (such as temperature changes) on the physiology of marine invertebrates. In a broader context, we are using temperature variation models of exoplanets to study implications for the growth and decline of hypothetical biological populations. Congratulations Alma!

2016-06-13: We have announced the discovery of a new planet orbiting two stars using data from the Kepler mission. The planet has both the largest size and largest orbit of any "circumbinary" planet yet discovered. It also orbits within the Habitable Zone of the binary system, which could have positive habitability implications for exomoons associated with the giant planet. The results of this work have been accepted for publication in the Astrophysical Journal and are available here.

2016-06-03: Professor Stephen Kane delivered two astrobiology talks that were streamed live via the NASA Astrobiology Institute Seminar Series and are now available for public viewing. The talks were held in early May 2016 at the University of California, Riverside. The first was a public talk entitled "Mercury Transit & Beyond: Planetary Discoveries Inside and Outside Our Solar System". The second was a science colloquium entitled "Analyzing Alien Worlds: A Multidisciplinary Approach to Characterizing Exoplanets". Additionally, a recent talk by Professor Kane delivered at the Silicon Valley Astronomy Lecture Series is now available online, and is entitled "Finding a New Earth: Exoplanets and the Habitable Zone".

2016-03-30: Using the Spitzer Space Telescope, we have observed 55 Cancri e, a two Earth radii planet that completes an orbit around the host star every 18 hours. Our observations show that there is an extreme day-night temperature difference of 1,300 K, consistent with either a thick atmosphere of a planet that has had the atmosphere stripped away. Read the associated publication to learn more.

2015-11-27: One of the most curious exoplanet discoveries over the past two decades is that planets can have highly eccentric orbits just like a comet. We can now confirm that HD 20782 b, a planet about 50% more massive than Jupiter, is the most eccentric planet known with an eccentricity of 0.96! We additionally found evidence that the planet "lights up" as it makes its closest approach to the host star. Read the associated publication to learn more.

2015-10-20: A research paper by PRL student Colin Chandler has been accepted for publication by the Astronomical Journal and was also featured on the website of the American Astronomical Society. The paper presents a new target selection catalog designed for surveys that aim to probe the Habitable Zone of nearby/bright host stars. The paper is entitled "The Catalog of Earth-Like Exoplanet Survey TArgets (CELESTA): A Database of Habitable Zones around Nearby Stars" and is available here.

2014-09-10: How common are Venus analogs in planetary systems? To help answer this question, we a have developed the "Venus Zone" as a target selection tool for future characterization missions. Our results identify 43 planets in the Venus Zone and show that almost half of Sun-like stars could have Venus-like planets. Read the associated publication to learn more.

2014-03-24: The Habitable Zone Gallery has been updated with many new features, plot, search functions, and much more. The gallery now contains 1,418 planets in 855 planetary systems, with 53 planets spending 100% of their orbit in the Habitable Zone.

2013-05-28: Imagine the hostile surface conditions on a more massive version of the planet Venus. We show in a recent paper that Kepler-69c is far more likely to bear a Venusian than Earth environment and thus is highly unlikely to be habitable. The Venera landers would not have fared so well.