Ibgui, Laurent, Spiegel, David S., Burrows, Adam
The radii of some transiting extrasolar giant planets are larger than would be expected by the standard theory. We address this puzzle with the model of coupled radius-orbit tidal evolution developed...
Ibgui, Laurent, Burrows, Adam, Spiegel, David S.
In order to explain the inflated radii of some transiting extrasolar giant planets, we investigate a tidal heating scenario for the inflated planets WASP-4b, WASP-6b, WASP-12b, WASP-15b, and TrES-4....
Models of Neptune-Mass Exoplanets: Emergent Fluxes and Albedos (2009)
Spiegel, David S., Burrows, Adam, Ibgui, Laurent, Hubeny, Ivan, Milsom, John A.
There are now many known exoplanets with Msin(i) within a factor of two of Neptune's, including the transiting planets GJ436b and HAT-P-11b. Planets in this mass-range are different from their more...
Can TiO Explain Thermal Inversions in the Upper Atmospheres of Irradiated Giant Planets? (2009)
Spiegel, David S., Silverio, Katie, Burrows, Adam
Spitzer Space Telescope infrared observations indicate that several transiting extrasolar giant planets have thermal inversions in their upper atmospheres. Above a relative minimum, the temperature...
New Worlds: Evaluating terrestrial planets as astrophysical objects (2009)
Scharf, Caleb A., Spiegel, David S., Chandler, Mark, Sohl, Linda, Del Genio, Anthony, Way, Michael, ...
Terrestrial exoplanets are on the verge of joining the ranks of astronomically accessible objects. Interpreting their observable characteristics, and informing decisions on instrument design and use,...
Habitable Climates: The Influence of Obliquity (2008)
Spiegel, David S., Menou, Kristen, Scharf, Caleb A.
Extrasolar terrestrial planets with the potential to host life might have large obliquities or be subject to strong obliquity variations. We revisit the habitability of oblique planets with an energy...
Spiegel, David S., Menou, Kristen, Scharf, Caleb A.
According to the standard liquid-water definition, the Earth is only partially habitable. We reconsider planetary habitability in the framework of energy-balance models, the simplest seasonal models...
On constraining a transiting exoplanet's rotation rate with its transit spectrum (2007)
Spiegel, David S., Haiman, Zoltan, Gaudi, B. Scott
We investigate the effect of planetary rotation on the transit spectrum of an extrasolar giant planet. During ingress and egress, absorption features arising from the planet's atmosphere are Doppler...
Discovery of a Very Bright, Nearby Gravitational Microlensing Event (2007)
Gaudi, B. Scott, Patterson, Joseph, Spiegel, David S., Krajci, Thomas, Koff, R., Pojmanski, G., ...
We report the serendipitous detection of a very bright, very nearby microlensing event. In late October 2006, an otherwise unremarkable A0 star at a distance ~1 kpc (GSC 3656-1328) brightened...
A possible dearth of hot gas in galaxy groups at intermediate redshift (2006)
Spiegel, David S., Paerels, Frits, Scharf, Caleb A.
We examine the X-ray luminosity of galaxy groups in the CNOC2 survey, at redshifts 0.1 < z < 0.6. Previous work examining the gravitational lensing signal of the CNOC2 groups has shown that they are...
Spiegel, David S., Zamojski, Michel, Gersch, Alan, Donovan, Jennifer, Haiman, Zoltan
We revisit the possibility of detecting an extrasolar planet around a background star as it crosses the fold caustic of a foreground binary lens. During such an event, the planet's flux can be...
Symmetries of the Helmholtz equation and its separable coordinate systems (1999)
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