5,999 research outputs found
Ultra Short Period Planets in K2: SuPerPiG Results for Campaigns 0-5
We have analyzed data from Campaigns 0-5 of the K2 mission and report 19
ultra-short-period candidate planets with orbital periods of less than 1 day
(nine of which have not been previously reported). Planet candidates range in
size from 0.7-16 Earth radii and in orbital period from 4.2 to 23.5 hours. One
candidate (EPIC 203533312, Kp=12.5) is among the shortest-period planet
candidates discovered to date (P=4.2 hours), and, if confirmed as a planet,
must have a density of at least rho=8.9 g/cm^3 in order to not be tidally
disrupted. Five candidates have nominal radius values in the sub-Jovian desert
(R_P=3-11 R_E and P<=1.5 days) where theoretical models do not favor their
long-term stability; the only confirmed planet in this range is in fact thought
to be disintegrating (EPIC 201637175). In addition to the planet candidates, we
report on four objects which may not be planetary, including one with
intermittent transits (EPIC 211152484) and three initially promising candidates
that are likely false positives based on characteristics of their light curves
and on radial velocity follow-up. A list of 91 suspected eclipsing binaries
identified at various stages in our vetting process is also provided. Based on
an assessment of our survey's completeness, we estimate an occurrence rate for
ultra-short period planets among K2 target stars that is about half that
estimated from the Kepler sample, raising questions as to whether K2 systems
are intrinsically different from Kepler systems, possibly as a result of their
different galactic location.Comment: 13 pages, 8 figures, accepted to AJ on 2016 May 2
Poincare duality for K-theory of equivariant complex projective spaces
We make explicit Poincare duality for the equivariant K-theory of equivariant complex projective spaces. The case of the trivial group provides a new approach to the K-theory orientation
Comparison of Aquifer Sustainability Under Groundwater Administrations in Oklahoma and Texas
We compared two approaches to administration of groundwater law on a hydrologic model of the North Canadian River, an alluvial aquifer in northwestern Oklahoma. Oklahoma limits pumping rates to retain 50% aquifer saturated thickness after 20 years of groundwater use. The Texas Panhandle Groundwater Conservation District’s (GCD) rules limit pumping to a rate that consumes no more than 50% of saturated thickness in 50 years, with reevaluation and readjustment of permits every 5 years. Using a hydrologic model (MODFLOW), we simulated river-groundwater interaction and aquifer dynamics under increasing levels of ‘‘development’’ (i.e., increasing groundwater withdrawals). Oklahoma’s approach initially would limit groundwater extraction more than the GCD approach, but the GCD approach would be more protective in the long run. Under Oklahoma rules more than half of aquifer storage would be depleted when development reaches 65%. Reevaluation of permits under the Texas Panhandle GCD approach would severely limit pumping as the 50% level is approached. Both Oklahoma and Texas Panhandle GCD approaches would deplete alluvial base flow at approximately 10% development. Results suggest periodic review of permits could protect aquifer storage and river base flow. Modeling total aquifer storage is more sensitive to recharge rate and aquifer hydraulic conductivity than to specific yield, while river leakage is most sensitive to aquifer hydraulic conductivity followed by specific yield
The Asymptotic Form of Cosmic Structure: Small Scale Power and Accretion History
We explore the effects of small scale structure on the formation and
equilibrium of dark matter halos in a universe dominated by vacuum energy. We
present the results of a suite of four N-body simulations, two with a LCDM
initial power spectrum and two with WDM-like spectra that suppress the early
formation of small structures. All simulations are run into to far future when
the universe is 64Gyr/h old, long enough for halos to essentially reach
dynamical equilibrium. We quantify the importance of hierarchical merging on
the halo mass accretion history, the substructure population, and the
equilibrium density profile. We modify the mass accretion history function of
Wechsler et al. (2002) by introducing a parameter, \gamma, that controls the
rate of mass accretion, dln(M) / dln(a) ~ a^(-\gamma), and find that this form
characterizes both hierarchical and monolithic formation. Subhalo decay rates
are exponential in time with a much shorter time scale for WDM halos. At the
end of the simulations, we find truncated Hernquist density profiles for halos
in both the CDM and WDM cosmologies. There is a systematic shift to lower
concentration for WDM halos, but both cosmologies lie on the same locus
relating concentration and formation epoch. Because the form of the density
profile remains unchanged, our results indicate that the equilibrium halo
density profile is set independently of the halo formation process.Comment: 17 pages, submitted to ApJ. Full resolution version avaliable at
http://www-personal.umich.edu/~mbusha/Papers/AccretionHistory.pd
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