Publications (15)
Concerning the Phase of the Time-Variation in the Cl-36 Decay Rate
Ephraim Fischbach, J. Thomas Gruenwald, Daniel Javorsek +4
We show that apparently conflicting results on the time-variation of the measured Cl-36 decay rates can be readily understood as arising from solar variability beyond the simple Ea…
SCUBA Mapping of Spitzer c2d Small Clouds and Cores
C. H. Young, T. L. Bourke, K. E. Young +6
We present submillimeter observations of dark clouds that are part of the Spitzer Legacy Program, From Molecular Cores to Planet-Forming Disks (c2d). We used the Submillimetre Comm…
Analysis of Gamma Radiation from a Radon Source: Indications of a Solar Influence
Peter A. Sturrock, Gideon Steinitz, Ephraim Fischbach +3
This article presents an analysis of about 29,000 measurements of gamma radiation associated with the decay of radon in a sealed container at the Geological Survey of Israel (GSI)…
The Spitzer c2d Survey of Weak-line T Tauri Stars II: New Constraints on the Timescale for Planet Building
Lucas Cieza, Deborah L. Padgett, Karl R. Stapelfeldt +18
One of the central goals of the Spitzer Legacy Project ``From Molecular Cores to Planet-forming Disks'' (c2d) is to determine the frequency of remnant circumstellar disks around we…
Multi--Pressure Polytropes as Models for the Structure and Stability of Molecular Clouds. I. Theory
Christopher F. McKee, John H. Holliman, II
Molecular clouds are supported by thermal pressure, magnetic pressure, and turbulent pressure. Each of these can be modeled with a polytropic equation of state, so that overall the…
A Re-interpretation of Historical References to the Supernova of 1054 AD
George W. Collins, II, William P. Claspy +1
In this paper we re-examine historical references to the supernova event of 1054 AD with a view to establishing a sequence astronomical events which minimizes apparent conflicts be…
High Resolution Mid-Infrared Spectroscopy of NGC 7538 IRS 1: Probing Chemistry in a Massive Young Stellar Object
C. Knez, J. H. Lacy, N. J. Evans +3
We present high resolution (R = 75,000-100,000) mid-infrared spectra of the high-mass embedded young star IRS 1 in the NGC 7538 star-forming region. Absorption lines from many rota…
On the Mass of a Universe with a Quantum String-Like Beginning
A. J. Meyer, II
In this paper the mass of a universe, which began as a gravitationally closed, maximally spinning, Planck density quantum string is derived. A universe beginning in such an initial…
White Paper on the Case for Landed Mercury Science
Paul K. Byrne, David T. Blewett, Nancy L. Chabot +5
We advocate for establishing key scientific priorities for the future of Mercury exploration, including the development of specific science goals for a landed mission. We support t…
Observation and Modeling of the Solar Transition Region: II. Solutions of the Quasi-Static Loop Model
Hakeem M. Oluseyi, A. B. C. Walker, II +3
In the present work we undertake a study of the quasi-static loop model and the observational consequences of the various solutions found. We obtain the most general solutions cons…
White Paper Towards a Fuller Understanding of Icy Satellite Seafloors, Interiors, and Habitability
Paul K. Byrne, Andrew J. Dombard, Catherine M. Elder +5
Icy satellites represent compelling astrobiological targets, but their rocky interiors must be better characterized. Fundamental research programs and thematic workshops promoting…
Cold Disks: Spitzer Spectroscopy of Disks around Young Stars with Large Gaps
J. M. Brown, G. A. Blake, C. P. Dullemond +10
We have identified four circumstellar disks with a deficit of dust emission from their inner 15-50 AU. All four stars have F-G spectral type, and were uncovered as part of the Spit…
The Cosmological Flatness Problem and Limits on Dark Matter
George W. Collins, II
The traditional argument to justify Omega_0 = rho/rho_{crit} = 1 which suggests an absurdly close agreement between the initial expansion energy of the universe and its binding ene…
Effect of core--mantle and tidal torques on Mercury's spin axis orientation
Stanton J. Peale, Jean-Luc Margot, Steven A Hauck +2
The rotational evolution of Mercury's mantle and its core under conservative and dissipative torques is important for understanding the planet's spin state. Dissipation results fro…
Disks that are double spiral staircases
Tobias H. Colding, W. P. Minicozzi, II
What are the possible shapes of various things and why? For instance, when a closed wire or a frame is dipped into a soap solution and is raised up from the solution, the surface s…