Cuatro Ciénegas, Mexico, a living laboratory and a proxy for early Earth, shows living stromatolites in a pristine river system, targets of investigation for the VPL team to better understand microbial evolution and adaptive processes.
VPL modeling results predict that a planet's gravitational interaction with the parent star can create extreme volcanism and vaporize oceans
VPL researchers work to understand the co-evolution of photosynthesis with the planetary environment on planets that orbit stars very different to our Sun.

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VPL Headlines

08/21/2015

Yuk Yung wins Kuiper Prize!

VPL researcher Yuk Yung has been awarded the AAS Division of Planetary Sciences Gerard P. Kuiper prize!  This award honors individuals who have made outstanding contributions to the field of planetary science.  Dr. Yung's work has led to significant advances in atmospheric photochemistry, global habitability, climate change, radiative transfer, and atmospheric evolution.  The models produced by Dr. Yung have been used widely in the planetary science community to interpret results from missions ranging from Voyager to New Horizons.  Congratulations Yuk Yung!  MORE>

08/07/2015

Is that really alien life?

In an article at Space.com, VPL PI Victoria Meadows and VPL researcher Shawn Domagal-Goldman discuss how processes in a planetary environment might mimic the presence of photosynthesis and confuse future searches for life on exoplanets.  Oxygen produced by bacteria and plants has long been regarded as a strong sign of life on our planet, but VPL research has uncovered four separate ways that a planet with no life could build up large quantities of oxygen in its atmosphere MORE>

07/30/2015

Collisions could reveal “invisible gas” in exoplanets

VPL graduate student Edward Schwieterman, professor Victoria Meadows, and researchers Tyler Robinson, Amit Misra, and Shawn Domagal-Goldman have demonstrated that the collisional absorption signature of nitrogen gas can be detected in Earth’s disk-averaged spectrum and have modeled how it would appear on Earth-like exoplanets. Usually, nitrogen is considered an “invisible gas” because it lacks normal spectral features.  Detection of nitrogen would provide a means to characterize the bulk atmosphere of potentially habitable exoplanets and constrain the likelihood of oxygen production by non-living processes. The paper will be published in The Astrophysical Journal. MORE>

06/10/2015

Atmospheric signs of volcanic activity could aid search for life

VPL graduate students Amit Misra, Josh Krissansen-Totton, Steve Sholes, and colleague have collaborated on an interdisciplinary paper on how to detect geological activity on extrasolar planets by looking for volcanically-induced transient sulfate aerosols in the planet's atmosphere. MORE>

05/07/2015

Searching for Alien Biosignatures: Non-Photosynthetic Organisms May Produce Novel Signatures of Life on Exoplanets

VPL graduate student Edward Schwieterman, professor Victoria Meadows, and professor Charles Cockell at the UK Centre for Astrobiology present an interdisciplinary study of the possibility non-photosynthetic organisms may create signs of life on Earth-like exoplanets. These organisms contain pigments that reflect light differently than water, rocks, or photosynthetic organisms like land plants, producing spectral signatures that could indicate the presence of life. The paper was published in the May issue of Astrobiology.   MORE>

05/06/2015

Earliest evidence for microbial nitrogen fixation at 3.2 billion years ago

VPL Researchers, led by NAI NPP postdoc Eva Stueeken, with colleagues Matt Koehler and Roger Buick analyzed 3.2 billion year old rocks from Australia and found the oldest record of life using atmospheric nitrogen to make organic chemicals. This discovery implies that the size of the early biosphere was not limited by nitrogen availability - a critical bottleneck for life - and that microbial life may have been quite abundant on the early Earth. The paper was recently published in "Nature".     MORE>

04/22/2015

VPL Joins the NExSS Exoplanet Research Network

VPL is now a founding member of NASA’s new Nexus for Exoplanet System Science (NExSS) research network and is credited as being part of the inspiration for the the formation of this scientific "super group." NExSS encourages exoplanet research projects funded by the NASA Astrophysics and Planetary Sciences Divisions to collaborate in a strongly interdisciplinary way:   MORE>

02/12/2015

Stars May Change Mini-Neptunes into Habitable Planets

VPL graduate student Rodrigo Luger, professors Rory Barnes and Victoria Meadows, and collaborators have found that some terrestrial planets in the habitable zones of low mass stars could be the evaporated cores of small Neptune-like planets. While these planets are likely to be very different from Earth in composition, they should have abundant surface water, one of the principal ingredients for habitability. The paper was published in the January issue of Astrobiology. MORE>

02/10/2015

New Venus Studies Probe the Dynamic Atmosphere Below the Clouds and Reveal the Complexities of Hazy Worlds

VPL graduate student, Giada Arney, and VPL colleagues, present the first maps of cloud opacity, droplet sulfuric acid percentage, and trace gases in the Venus lower atmosphere.  Unexpected temporal and spatial variations of several species may be related to rainout processes, and variable hemispherical dichotomies suggest that the Venusian troposphere is just as dynamic as higher layers of the atmosphere.  There may be many Venus-like exoplanets, and understanding the planet next door is the first step to understanding these other worlds. MORE>

12/01/2014

Too Hot To Handle: Planets in the Habitable Zones of Low Mass Stars May Be Roasted Early On

VPL graduate student Rodrigo Luger and Professor Rory Barnes have shown that many terrestrial planets in the habitable zones of low mass (M dwarf) stars could have experienced extreme stellar heating for up to 1 billion years after planet formation. This heating arises because M dwarfs evolve differently than the Sun -- they contract and cool for a much longer period of time. As they cool, the habitable zone moves in and so planets we find in the habitable zone today may have spent up to 1 billion years in a Venus-like state. During this period, destruction of water by UV radiation and hydrogen escape to space could ultimately build up massive abiotic oxygen atmospheres. MORE>