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A Computational Tool to Interpret the Bulk Composition of Solid Exoplanets based on Mass and Radius Measurements
Li Zeng, Sara Seager
The prospects for finding transiting exoplanets in the range of a few to 20 Earth masses is growing rapidly with both ground-based and spaced-based efforts. We describe a publicly…
Ranges of Atmospheric Mass and Composition of Super Earth Exoplanets
L. Elkins-Tanton, S. Seager
Terrestrial-like exoplanets may obtain atmospheres from three primary sources: Capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity…
Coreless Terrestrial Exoplanets
L. Elkins-Tanton, S. Seager
Differentiation in terrestrial planets is expected to include the formation of a metallic iron core. We predict the existence of terrestrial planets that have differentiated but ha…
The Atmospheric Signatures of Super-Earths: How to Distinguish Between Hydrogen-Rich and Hydrogen-Poor Atmospheres
E. Miller-Ricci, D. Sasselov, S. Seager
Extrasolar super-Earths (1-10 M$_{\earth}$) are likely to exist with a wide range of atmospheres. Some super-Earths may be able to retain massive hydrogen-rich atmospheres. Others…
Worlds Beyond: A Strategy for the Detection and Characterization of Exoplanets
J. I. Lunine, D. Fischer, H. Hammel +13
This is a scientific strategy for the detection and characterization of extrasolar planets; that is, planets orbiting other stars. As such, it maps out over a 15-year horizon the t…
The NASA EPOXI mission of opportunity to gather ultraprecise photometry of known transiting exoplanets
Jessie L. Christiansen, David Charbonneau, Michael F. A'Hearn +16
The NASA Discovery mission EPOXI, utilizing the Deep Impact flyby spacecraft, comprises two phases: EPOCh (Extrasolar Planet Observation and Characterization) and DIXI (Deep Impact…
Preliminary Results on HAT-P-4, TrES-3, XO-2, and GJ 436 from the NASA EPOXI Mission
Sarah Ballard, David Charbonneau, Michael F. A'Hearn +16
EPOXI (EPOCh + DIXI) is a NASA Discovery Program Mission of Opportunity using the Deep Impact flyby spacecraft. The EPOCh (Extrasolar Planet Observation and Characterization) Scien…
Towards the Albedo of an Exoplanet: MOST Satellite Observations of Bright Transiting Exoplanetary Systems
Jason F. Rowe, Jaymie M. Matthews, Sara Seager +7
The Canadian MOST satellite is a unique platform for observations of bright transiting exoplanetary systems. Providing nearly continuous photometric observations for up to 8 weeks,…
Reflected light from 3D exoplanetary atmospheres and simulation of HD 209458b
Ben Hood, Kenneth Wood, Sara Seager +1
We present radiation transfer models that demonstrate that reflected light levels from three dimensional (3D) exoplanetary atmospheres can be more than 50% lower than those predict…
Identifying the rotation rate and the presence of dynamic weather on extrasolar Earth-like planets from photometric observations
E. Palle, Eric B. Ford, S. Seager +2
With the recent discoveries of hundreds of extrasolar planets, the search for planets like Earth and life in the universe, is quickly gaining momentum. In the future, large space o…
On Signatures of Atmospheric Features in Thermal Phase Curves of Hot Jupiters
Emily Rauscher, Kristen Menou, James Y-K. Cho +2
Turbulence is ubiquitous in Solar System planetary atmospheres. In hot Jupiter atmospheres, the combination of moderately slow rotation and thick pressure scale height may result i…
The Very Low Albedo of an Extrasolar Planet: MOST Spacebased Photometry of HD 209458
Jason F. Rowe, Jaymie M. Matthews, Sara Seager +8
Measuring the albedo of an extrasolar planet provides insights into its atmospheric composition and its global thermal properties, including heat dissipation and weather patterns.…
Ocean Planet or Thick Atmosphere: On the Mass-Radius Relationship for Solid Exoplanets with Massive Atmospheres
E. R. Adams, S. Seager, L. Elkins-Tanton
The bulk composition of an exoplanet is commonly inferred from its average density. For small planets, however, the average density is not unique within the range of compositions.…
Thermal Emission from Transiting Very-Hot Jupiters: Prospects for Ground-based Detection at Optical Wavelengths
Mercedes Lopez-Morales, Sara Seager
Very hot Jupiters (VHJs) are defined as Jupiter-mass extrasolar planets with orbital periods shorter than three days. For low albedos the effective temperatures of irradiated VHJs…
Mass-Radius Relationships for Solid Exoplanets
S. Seager, M. Kuchner, C. Hier-Majumder +1
We use new interior models of cold planets to investigate the mass-radius relationships of solid exoplanets, considering planets made primarily of iron, silicates, water, and carbo…
Spitzer Transit and Secondary Eclipse Photometry of GJ 436b
Drake Deming, Joseph Harrington, Gregory Laughlin +4
We report the results of infrared (8 micron) transit and secondary eclipse photometry of the hot Neptune exoplanet, GJ436b using Spitzer. The nearly photon-limited precision of the…
Hot Jupiter Variability in Eclipse Depth
Emily Rauscher, Kristen Menou, James Y-K. Cho +2
Physical conditions in the atmospheres of tidally-locked, slowly-rotating hot Jupiters correspond to dynamical circulation regimes with Rhines scales and Rossby deformation radii c…
Toward Eclipse Mapping of Hot Jupiters
Emily Rauscher, Kristen Menou, Sara Seager +3
Recent Spitzer infrared measurements of hot Jupiter eclipses suggest that eclipse mapping techniques could be used to spatially resolve the day-side photospheric emission of these…
The phase-dependent Infrared brightness of the extrasolar planet upsilon Andromedae b
J. Harrington, B. Hansen, S. Luszcz +5
The star upsilon Andromeda is orbited by three known planets, the innermost of which has an orbital period of 4.617 days and a mass at least 0.69 that of Jupiter. This planet is cl…
Limits to Transits of the Neptune-mass planet orbiting Gl 581
Mercedes Lopez-Morales, Nidia I. Morrell, R. Paul Butler +1
We have monitored the Neptune-mass exoplanet-hosting M-dwarf Gl 581 with the 1m Swope Telescope at Las Campanas Observatory over two predicted transit epochs. A neutral density fil…
Atmospheric Circulation of Close-In Extrasolar Giant Planets: I. Global, Barotropic, Adiabatic Simulations
James Y-K. Cho, Kristen Menou, Brad Hansen +1
We present results from a set of over 300 pseudospectral simulations of atmospheric circulation on extrasolar giant planets with circular orbits. The simulations are of high enough…
An Upper Limit on the Albedo of HD 209458b: Direct Imaging Photometry with the MOST Satellite
J. F. Rowe, J. M. Matthews, S. Seager +7
We present space-based photometry of the transiting exoplanetary system HD 209458 obtained with the MOST (Microvariablity and Oscillations of STars) satellite, spanning 14 days and…
Atmospheres of Extrasolar Giant Planets
Mark S. Marley, Jonathan Fortney, Sara Seager +1
The key to understanding an extrasolar giant planet's spectrum--and hence its detectability and evolution--lies with its atmosphere. Now that direct observations of thermal emissio…
Comparative Planetology and the Search for Life Beyond the Solar System
Charles A. Beichman, Malcolm Fridlund, Wesley A. Traub +3
The study of planets beyond the solar system and the search for other habitable planets and life is just beginning. Ground-based (radial velocity and transits) and space-based surv…