Fortney, Jonathan J., Zahnle, Kevin, Baraffe, Isabelle, Burrows, Adam, Dodson-Robinson, Sarah E., Chabrier, Gilles, ...
The determination of Saturn's atmospheric noble gas abundances are critical to understanding the formation and evolution of Saturn, and giant planets in general. These measurements can only be...
Multiple Scattering Polarization of Substellar-mass Objects : T-dwarfs (2009)
Sengupta, Sujan, Marley, Mark S.
While there have been multiple observational programs aimed at detecting linear polarization of optical radiation emitted by ultracool dwarfs, there has been comparatively less rigorous theoretical...
Stephens, D. C., Leggett, S. K., Cushing, Michael C., Marley, Mark S., Saumon, D., Geballe, T. R., ...
We present new 5.2-14.5 micron low-resolution spectra of 14 mid-L to mid-T dwarfs, as well as 3.0-4.1 micron spectra for five of these dwarfs. These data are supplemented by existing red and...
2MASS J09393548–2448279: The coldest and least luminous brown dwarf binary known? (2008)
Burgasser, Adam J., Tinney, C. G., Cushing, Michael C., Saumon, Didier, Marley, Mark S., Bennett, Clara S., ...
Determinations of the luminosity and atmospheric properties of the T8 brown dwarf 2MASS J09393548 - 2448279 are presented, based on Spitzer IRAC and IRS observations and ground-based astrometry. We...
The Atmospheres of Extrasolar Planets (2008)
The characteristics of irradiated solar system planetary atmospheres have been studied for decades, consequently modern planetary science benefits from an exhaustive body of ground- and space-based...
Showman, Adam P., Fortney, Jonathan J., Lian, Yuan, Marley, Mark S., Freedman, Richard S., Knutson, Heather A., ...
We present global, three-dimensional numerical simulations of HD 189733b and HD 209458b that couple the atmospheric dynamics to a realistic representation of non-gray cloud-free radiative transfer....
Moderate-resolution Spitzer infrared spectrograph observations of M, L, and T dwarfs (2008)
Mainzer, A. K., Roellig, Thomas L., Saumon, D., Marley, Mark S., Cushing, Michael C., Sloan, G. C., ...
We present 10-19 μm moderate-resolution spectra of 10 M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. The IRS...
Fortney, Jonathan J., Marley, Mark S., Saumon, Didier, Lodders, Katharina
We examine the spectra and infrared colors of the cool methane-dominated atmospheres at Teff < 1400 K expected for young gas giant planets. We couple these spectral calculations to an updated version...
A Spectroscopic Binary at the M/L Transition (2008)
Blake, Cullen H., Charbonneau, David, White, Russel J., Torres, Guillermo, Marley, Mark S., Saumon, Didier
We report the discovery of a single-lined spectroscopic binary with an Ultra Cool Dwarf (UCD) primary with a spectral type between M8 and L0.5. This system was discovered during the course of an...
The Future of Ultracool Dwarf Science with JWST (2008)
Marley, Mark S., Leggett, S. K.
Ultracool dwarfs exhibit a remarkably varied set of characteristics which hint at the complex physical processes acting in their atmospheres and interiors. Spectra of these objects not only depend...
Showman, Adam P., Cooper, Curtis S., Fortney, Jonathan J., Marley, Mark S.
We present global, three-dimensional numerical simulations of the atmospheric circulation on HD 209458b and HD 189733b and calculate the infrared spectra and light curves predicted by these...
Detectability of CO, PH (2007)
Ash And, Keith S. Noll, Mark S. Marley
. We have caluclated model spectra near 5 ¯m for the brown dwarf Gl 229B including molecules that are sensitive to vertical mixing. CO and PH 3 are potentially detectable, but AsH 3 and GeH 4 are...
Atmospheric Parameters of Field L and T Dwarfs (2007)
Cushing, Michael C., Marley, Mark S., Saumon, D., Kelly, Brandon C., Vacca, William D., Rayner, John T., ...
We present an analysis of the 0.95-14.5 micron spectral energy distributions of nine field ultracool dwarfs with spectral types ranging from L1 to T4.5. Effective temperatures, gravities, and...
Fortney, Jonathan J., Lodders, Katharina, Marley, Mark S., Freedman, Richard S.
We highlight the importance of gaseous TiO and VO opacity on the highly irradiated close-in giant planets. The atmospheres of these planets naturally fall into two classes that are somewhat analogous...
Line and Mean Opacities for Ultracool Dwarfs and Extrasolar Planets (2007)
Freedman, Richard S., Marley, Mark S., Lodders, Katharina
Opacities and chemical abundance data are crucial ingredients of ultracool dwarf and extrasolar giant planet atmosphere models. We report here on the detailed sources of molecular opacity data...
Multiepoch Radial Velocity Observations of L Dwarfs (2007)
Blake, Cullen H., Charbonneau, David, White, Russel J., Marley, Mark S., Saumon, Didier
We report on the development of a technique for precise radial-velocity measurements of cool stars and brown dwarfs in the near infrared. Our technique is analogous to the Iodine (I2) absorption cell...
Analysis of Spitzer Spectra of Irradiated Planets: Evidence for Water Vapor? (2007)
Fortney, Jonathan J., Marley, Mark S.
Published mid infrared spectra of transiting planets HD 209458b and HD 189733b, obtained during secondary eclipse by the InfraRed Spectrograph (IRS) aboard the Spitzer Space Telescope, are...
Moderate Resolution Spitzer Infrared Spectrograph (IRS) Observations of M, L, and T Dwarfs (2007)
Mainzer, A. K., Roellig, Thomas L., Saumon, D., Marley, Mark S., Cushing, Michael C., Sloan, G. C., ...
We present 10 - 19 um moderate resolution spectra of ten M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. The IRS...
Fortney, Jonathan J., Marley, Mark S., Barnes, Jason W.
To aid in the physical interpretation of planetary radii constrained through observations of transiting planets, or eventually direct detections, we compute model radii of pure hydrogen-helium,...
TPF-C : status and recent progress (2006)
Traub, Wesley A., Levine, Marie, Shaklan, Stuart, Kasting, James, Angel, J. Roger, Brown, Michael E., ...
The Terrestrial Planet Finder Coronagraph (TPF-C) is a deep space mission designed to detect and characterize Earthlike planets around nearby stars. TPF-C will be able to search for signs of life on...
Atmospheres of Extrasolar Giant Planets (2006)
Marley, Mark S., Fortney, Jonathan, Seager, Sara, Barman, Travis
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 emission from extrasolar...
L ' and M ' photometry of ultracool dwarfs (2004)
Golimowski, David A., Leggett, Sandy K., Marley, Mark S., Fan, Xiaohui, Geballe, Thomas R., Knapp, Gillian R., ...
We have compiled L′ (3.4-4.1 μm) and M′ (4.6-4.8 μm) photometry of 63 single and binary M, L, and T dwarfs obtained at the United Kingdom Infrared Telescope using the Mauna...
Knapp, Gillian R., Leggett, Sandy K., Fan, Xiaohui, Marley, Mark S., Geballe, Thomas R., Golimowski, David A., ...
We present new JHK photometry on the MKO-NIR system and JHK spectroscopy for a large sample of L and T dwarfs. Photometry has been obtained for 71 dwarfs, and spectroscopy for 56. The sample...
L ' and M ' photometry of ultracool dwarfs (2004)
Golimowski, David A., Leggett, Sandy K., Marley, Mark S., Fan, Xiaohui, Geballe, Thomas R., Knapp, Gillian R., ...
We have compiled L′ (3.4-4.1 μm) and M′ (4.6-4.8 μm) photometry of 63 single and binary M, L, and T dwarfs obtained at the United Kingdom Infrared Telescope using the Mauna...
Knapp, Gillian R., Leggett, Sandy K., Fan, Xiaohui, Marley, Mark S., Geballe, Thomas R., Golimowski, David A., ...
We present new JHK photometry on the MKO-NIR system and JHK spectroscopy for a large sample of L and T dwarfs. Photometry has been obtained for 71 dwarfs, and spectroscopy for 56. The sample...
L-dwarf variability: I-band observations (2002)
Gelino, Christopher R., Marley, Mark S., Holtzman, Jon A., Ackerman, Andrew S., Lodders, Katharina
We report on the results of an I-band photometric variability survey of eighteen L dwarfs. We find that seven exhibit statistically significant variations above the 95.4% confidence level with...
Evidence for Cloud Disruption in the L/T Dwarf Transition (2002)
Burgasser, Adam J., Marley, Mark S., Ackerman, Andrew S., Saumon, Didier, Lodders, Katharina, Dahn, Conard C., ...
Clouds of metal-bearing condensates play a critical role in shaping the emergent spectral energy distributions of the coolest classes of low-mass stars and brown dwarfs, L and T dwarfs. Because...
L-dwarf variability: Magnetic star spots or non-uniform clouds? (2001)
Gelino, Christopher R., Marley, Mark S., Holtzman, Jon A., Ackerman, Andrew S., Lodders, Katharina
The recent discovery of photometric variations in L dwarfs has opened a discussion on the cause of the variations. We argue against the existence of magnetic spots in these atmospheres and favor the...
Precipitating Condensation Clouds in Substellar Atmospheres (2001)
Ackerman, Andrew S., Marley, Mark S.
We present a method to calculate vertical profiles of particle size distributions in condensation clouds of giant planets and brown dwarfs. The method assumes a balance between turbulent diffusion...
The Onset of Methane in L Dwarfs (2000)
Noll, Keith S., Geballe, T. R., Leggett, S. K., Marley, Mark S.
We have detected weak absorption features produced by the strong nu(3) methane band at 3.3 microns in two L dwarfs, 2MASSW J1507476-162738 and 2MASSI J0825196+211552, classified by Kirkpatrick et al....
Atmospheres of Giant Planets from Neptune to Gliese 229B (1997)
Stratospheric heating, condensation, convective transport of non-equilibrium species, and deep radiative energy transport are important processes in the atmospheres of the solar jovian planets. They...