Search Results - "Hansen, Brad M.S"

COOL WHITE DWARFS by Hansen, Brad M.S, Liebert, James

“…Old, cool white dwarfs convey valuable information about the early history of our Galaxy. They have been used to determine the age of the galactic disk,…”
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Probing the Faintest Stars in a Globular Star Cluster by Richer, Harvey B, Anderson, Jay, Brewer, James, Davis, Saul, Fahlman, Gregory G, Hansen, Brad M.S, Hurley, Jarrod, Kalirai, Jasonjot S, King, Ivan R, Reitzel, David, Rich, R. Michael, Shara, Michael M, Stetson, Peter B

“…NGC 6397 is the second closest globular star cluster to the Sun. Using 5 days of time on the Hubble Space Telescope, we have constructed an ultradeep…”
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TESTING IN SITU ASSEMBLY WITH THE KEPLER PLANET CANDIDATE SAMPLE by Hansen, Brad M S, Murray, Norm

“…We present a Monte Carlo model for the structure of low-mass (total mass <25 M sub([+ in circle])) planetary systems that form by the in situ gravitational…”
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Formation of the Terrestrial Planets from a Narrow Annulus by Hansen, Brad M. S

“…We show that the assembly of the solar system terrestrial planets can be successfully modeled with all of the mass initially confined to a narrow annulus…”
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Re-evaluating hot Jupiter WASP-12b: An update by Crossfield, Ian J.M., Barman, Travis, Hansen, Brad M.S., Tanaka, Ichi, Kodama, Tadayuki

“…The hot Jupiter WASP-12b Is one of the largest, hottest, and best-studied extrasolar planets. We revisit our recent analysis of WASP-12b's emission spectrum in…”
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Calibration of Equilibrium Tide Theory for Extrasolar Planet Systems by Hansen, Brad M. S

“…We provide an 'effective theory' of tidal dissipation in extrasolar planet systems by empirically calibrating a model for the equilibrium tide. The model is…”
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CALIBRATION OF EQUILIBRIUM TIDE THEORY FOR EXTRASOLAR PLANET SYSTEMS. II by HANSEN, Brad M. S

“…We present a new empirical calibration of equilibrium tidal theory for extrasolar planet systems, extending a prior study by incorporating detailed physical…”
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ELEVEN MULTIPLANET SYSTEMS FROM K2 CAMPAIGNS 1 AND 2 AND THE MASSES OF TWO HOT SUPER-EARTHS by Sinukoff, Evan, Howard, Andrew W., Petigura, Erik A., Schlieder, Joshua E., Crossfield, Ian J. M., Ciardi, David R., Fulton, Benjamin J., Isaacson, Howard, Aller, Kimberly M., Baranec, Christoph, Beichman, Charles A., Hansen, Brad M. S., Knutson, Heather A., Law, Nicholas M., Liu, Michael C., Riddle, Reed, Dressing, Courtney D.

“…ABSTRACT We present a catalog of 11 multiplanet systems from Campaigns 1 and 2 of the K2 mission. We report the sizes and orbits of 26 planets split between…”
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RE-EVALUATING WASP-12b: STRONG EMISSION AT 2.315 μm, DEEPER OCCULTATIONS, AND AN ISOTHERMAL ATMOSPHERE by CROSSFIELD, Ian J. M, BARMAN, Travis, HANSEN, Brad M. S, TANAKA, Ichi, KODAMA, Tadayuki

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The chaotic nature of TRAPPIST-1 planetary spin states by Vinson, Alec M, Tamayo, Daniel, Hansen, Brad M S

“…ABSTRACT The TRAPPIST-1 system has seven known terrestrial planets arranged compactly in a mean motion resonant chain around an ultracool central star, some…”
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On the spin states of habitable zone exoplanets around M dwarfs: the effect of a near-resonant companion by Vinson, Alec M., Hansen, Brad M. S.

“…Abstract One long-standing problem for the potential habitability of planets within M dwarf systems is their likelihood to be tidally locked in a synchronously…”
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A NEARBY M STAR WITH THREE TRANSITING SUPER-EARTHS DISCOVERED BY K2 by Crossfield, Ian J. M., Petigura, Erik, Schlieder, Joshua E., Howard, Andrew W., Fulton, B. J., Aller, Kimberly M., Ciardi, David R., Lépine, Sébastien, Barclay, Thomas, Pater, Imke de, Kleer, Katherine de, Quintana, Elisa V., Christiansen, Jessie L., Schlafly, Eddie, Kaltenegger, Lisa, Crepp, Justin R., Henning, Thomas, Obermeier, Christian, Deacon, Niall, Weiss, Lauren M., Isaacson, Howard T., Hansen, Brad M. S., Liu, Michael C., Greene, Tom, Howell, Steve B., Barman, Travis, Mordasini, Christoph

“…ABSTRACT Small, cool planets represent the typical end-products of planetary formation. Studying the architectures of these systems, measuring planet masses…”
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HIGH-RESOLUTION, DIFFERENTIAL, NEAR-INFRARED TRANSMISSION SPECTROSCOPY OF GJ 1214b by Crossfield, I J M

“…The nearby star GJ 1214 hosts a planet intermediate in radius and mass between Earth and Neptune, resulting in some uncertainty as to its nature. We have…”
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Two Classes of Hot Jupiters by Hansen, Brad M. S, Barman, Travis

“…We identify two classes of transiting planet, based on their equilibrium temperatures and Safronov numbers. We examine various possible explanations for the…”
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CONSTRAINING NEUTRINO COOLING USING THE HOT WHITE DWARF LUMINOSITY FUNCTION IN THE GLOBULAR CLUSTER 47 TUCANAE by Hansen, Brad M. S., Richer, Harvey, Kalirai, Jason, Goldsbury, Ryan, Frewen, Shane, Heyl, Jeremy

“…ABSTRACT We present Hubble Space Telescope observations of the upper part ( K) of the white dwarf cooling sequence in the globular cluster 47 Tucanae and…”
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Bound circumplanetary orbits under the influence of radiation pressure: Application to dust in directly imaged exoplanet systems by Hansen, Bradley M. S., Hayakawa, Kevin

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The Initial-Final Mass Relation: Direct Constraints at the Low-Mass End by Kalirai, Jasonjot S, Hansen, Brad M. S, Kelson, Daniel D, Reitzel, David B, Rich, R. Michael, Richer, Harvey B

“…The initial-final mass relation represents a mapping between the mass of a white dwarf remnant and the mass that the hydrogen-burning main-sequence star that…”
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ULTRA-DEEP HUBBLE SPACE TELESCOPE IMAGING OF THE SMALL MAGELLANIC CLOUD: THE INITIAL MASS FUNCTION OF STARS WITH M ≲ 1 M by Kalirai, Jason S., Anderson, Jay, Dotter, Aaron, Richer, Harvey B., Fahlman, Gregory G., Hansen, Brad M. S., Hurley, Jarrod, Reid, I. Neill, Rich, R. Michael, Shara, Michael M.

“…We present a new measurement of the stellar initial mass function (IMF) based on ultra-deep, high-resolution photometry of >5000 stars in the outskirts of the…”
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The Masses of Population II White Dwarfs by Kalirai, Jason S, Davis, D. Saul, Richer, Harvey B, Bergeron, P, Catelan, Marcio, Hansen, Brad M. S, Michael Rich, R

“…Globular star clusters are among the first stellar populations to have formed in the Milky Way, and thus only a small sliver of their initial spectrum of…”
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TWO TRANSITING LOW DENSITY SUB-SATURNS FROM K2 by Petigura, Erik A., Howard, Andrew W., Lopez, Eric D., Deck, Katherine M., Fulton, Benjamin J., Crossfield, Ian J. M., Ciardi, David R., Chiang, Eugene, Lee, Eve J., Isaacson, Howard, Beichman, Charles A., Hansen, Brad M. S., Schlieder, Joshua E., Sinukoff, Evan

“…ABSTRACT We report the discovery and confirmation of K2-24 b and c, two sub-Saturn planets orbiting a bright (V = 11.3), metal-rich ([Fe/H] = 0.42 0.04 dex) G3…”
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