Lava field with snow

Research at DTM stretches from our world to the edge of the Universe.

The Department of Terrestrial Magnetism was founded in 1904 to map the geomagnetic field of the Earth. Over the years the research direction shifted, but the historic goal to understand the Earth and its place in the universe has remained the same. Today the department is home to an interdisciplinary team of astronomers and astrophysicists, geophysicists and geochemists, cosmochemists and planetary scientists.

These Carnegie researchers are discovering planets outside our solar system, determining the age and structure of the solar system, and studying the causes of earthquakes and volcanoes. With colleagues from the Geophysical Laboratory, these investigators are also helping to define the new and exciting field of astrobiology.

Diana Roman


Forecasting volcanic activity requires continuous monitoring for signals of magmatic unrest in harsh, often remote environments. Furthermore, because volcanoes generally host abundant (non-volcanic) environmental noise, monitored signals must be confirmed on multiple instruments to avoid the possibility of false alarms due to a non-volcanic source of an apparent increase in a monitored signal. BENTO is a next-generation monitoring system that is highly portable, low-cost, rapidly deployable, and entirely autonomous. Such a system could be used to provide critical monitoring and data collection capabilities during rapid-onset eruptions, or to provide a crude baseline monitor at large numbers of remote volcanoes to 'flag' the onset of unrest so that costlier resources such as specialized instrumentation can be deployed in the appropriate place at the appropriate time. Ongoing field-testing and refinement of BENTO prototypes, and strategies for their deployment, in a wide range of volcanic environments is helping to produce a reliable technology that can be incorporated into volcano monitoring activities worldwide.

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Proxima b

The Earthbound Planet Search

Finding planets orbiting nearby stars has been a holy grail in astronomy for more than 400 years. We began working on this problem 30 years ago, at a time when there were no known extrasolar planets. In late 1995 we began routinely finding planets around the nearest stars. Since then we have found several hundred planets, including the first sub-saturn mass planet, the first neptune mass planet, the first terrestrial mass planet, the first multiple planet system, and the first transiting planet.

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Large Binocular Telescope Hunt for Observable Signatures of Terrestrial Planetary Systems (LBTI-HOSTS)

The purpose of this survey is to detect or limit warm dust in the habitable zones of nearby stars. About 20% of field stars have cold debris disks created by the collisions and evaporation of planetesimals. Much less is known about warm circumstellar dust, such as that found in the vicinity of the Earth in our own system. This dust is generated in asteroidal collisions and cometary breakups, and current detection limits are at best ~500 times our system's level, i.e. 500 zodi. LBTI-HOSTS will be the first survey capable of measuring exozodi at the 10 zodi level (3). Exozodi of this brightness would be the major source of astrophysical noise for a future space telescope aimed at direct imaging and spectroscopy of habitable zone terrestrial planets. Detections of warm dust will also reveal new information about planetary system architectures and evolution.

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Superdeep diamonds

Superdeep Diamonds and Mantle Convection

Superdeep diamonds are derived from below the continental lithosphere and most likely from the transition zone (670km deep) or the top of the lower mantle. A full understanding of their origins and the compositions of the high pressure mineral phases has potential to revolutionize our understanding of deep mantle circulation.

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Kepler NASA/Ames/JPL

Kepler: A Search for Habitable Planets

Alan P. Boss - Science Working Group Member

Kepler is NASA's first mission capable of finding Earth-size planets around other stars. The centuries-old quest for other worlds like our Earth has been rejuvenated by the intense excitement and popular interest surrounding the discovery of hundreds of planets orbiting other stars. There is now clear evidence for substantial numbers of three types of exoplanets; gas giants, hot-super-Earths in short period orbits, and ice giants.

The challenge now is to find terrestrial planets (i.e., those one half to twice the size of the Earth), especially those in the habitable zone of their stars where liquid water and possibly life might exist.

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Intracontinental Deformation And Surface Uplift In Mongolia

High-elevation, low relief surfaces are common on continents. These intercontinental plateaus influence river networks, climate, and the migration of plants and animals. How these plateaus form is not clear. We are studying the geodynamic processes responsible for surface uplift in the Hangay in central Mongolia to better understand the origin of high topography in continental interiors.

This work focuses on characterizing the physical properties and structure of the lithosphere and sublithospheric mantle, and the timing, rate, and pattern of surface uplift in the Hangay. We are carrying out studies in geomorphology, geochronology, thermochronology, paleoaltimetry, biogeography, petrology, geochemistry, and seismology.

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The MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) mission to orbit Mercury following three flybys of that planet is a scientific investigation of the planet Mercury. Understanding Mercury, and the forces that have shaped it is fundamental to understanding the terrestrial planets and their evolution. The orbital phase will use the flyby data as an initial guide to perform a focused scientific investigation of this enigmatic world.

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Search for Exoplanets

DTM has undertaken a new search for Jupiter-like planets in orbit around nearby stars. Using the 2.5-m du Pont telescope located at Carnegie's Las Campanas Observatory in Chile, we are searching for gas giant planets similar to Jupiter by the astrometric method. In this method, the wobble of the host star's position on the sky as it orbits around the center of mass of the star-planet system is measured with high accuracy. Knowing the mass of the star then allows the true mass of the planet, as well as its orbital parameters (including the semi-major axis, eccentricity, and inclination), to be determined.

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