Day 113

Saturday.  I gotta get most of my work for the weekend done today.  


1110.4377
The impact of circumplanetary jets on transit spectra and timing offsets for Hot-Jupiters
Dobbs-Dixon, Agol, Burrows


Theoretical wavelength-dependent transit lightcurves for HD209458b based on 3d radiative hydro model.  Calculate signatures associated with the emergence of a super-rotating circumplanetary jet [i.e., within the Hot-Jupiter atmosphere].  


1110.4384
A revised parallel-sequence morphological classification of galaxies: structure and formation of S0 and Spheroidal galaxies
Kormendy, Bender


S0a-S0b-S0c parallels Sa-Sb-Sc of spiral galaxies; the ratio B/T of bulge to total light defines the position of galaxy in each sequence.  Extend S0a-... to spheroidal ("Sph") galaxies that are positioned in parallel to irregular galaxies in a similarly extended Sa-Sb-Sc-Im sequence.  Juxtaposition of Sph and irregular galaxies: present photometry and bulge-disk decompositions of Virgo S0s, including late-type S0s that bridge the gap between S0b and Sph galaxies.  [Easier to be convinced when looking at the color-magnitude diagram.  Sd/Im are the dimmest of the blue cloud, Sph are the dimmest of the red sequence.]


1110.4391
Discovery of a dissociative galaxy cluster merger with large physical separation
Dawson, Wittman, Jee, Gee, Hughes, Tyson, Schmidt, Thorman, Bradac, Miyazaki, Lemaux, Utsumi


Collisional cluster gas dissociated from (collision-less) galaxies and DM.  DM self-interaction cross section sigma_DM/m_DM <= 7 cm^2/g.  


* I want to know how they calculate these numbers--the cross sections and all.


1110.4392
Multiple-planet scattering and the origin of hot Jupiters
Beauge, Nesvorny


Exoplanets show a pile-up of Jupiter-size planets in orbits with at 3-day period.  Fraction have retrograde orbit wrt star's rotation.  Numerical integrations: start with systems initially having 3 or 4 planets.  Standard Kozai migration mechanism inefficient.  Two distinct populations of hot jupiters: inner population (<0.03) are transients (fall into star at <1Gyr), formed in the system where no planetary ejections occurred; highly retrograde and inclined orbits.  Outer population of hot jupiters formed in systems where at least one planet was ejected, surviving effects of tides over >1Gyr.  Semimajor axis distribution of Population II fits the observed 3-day pile-up.  Inclination distribution of outer hot jupiters depends on the number of planets in the initial systems (4-planet case showed a larger proportion ~10%), and wider spread in inclination values.    Suggests: Hot Jupiter systems initially started out with many planets, some of which were ejected.  Related to free-floating planets?


1110.4393
I Zw 18 as morphological paradigm for rapidly assembling high-z galaxies
Papaderos, Ostlin


I Zwicky 18, "blue compact dwarf" (BCD) galaxy, atypical because the extended exponential low-surface brightness envelope is entirely due to extended nebular emission ("ne").  Use HST to go really faint.  SF over the past ~100Myr with stellar diffusion and radial stellar mass filtering effect explains properties of IZw18.  The ne extends out the ~16 stellar scale lengths and provides at least 1/3 of the total optical emission.  Rapid assembly of stellar mass at high SSFRs: energetic output during dominant phases of galaxy evolution may result in large exponential ne envelopes, extending much beyond the still compact stellar component.  IZw18 may be ubiquitous among high-SSFR galaxies at high redshift.  Extended ne may introduce substantial observational biases and significantly affect fundamental galaxy relations.  Surface brightness profiles of distant morphological analogs to IZw18 may be barely distinguishable from Sersic profiles with an exponent 2<n<5, thus mimicking the profiles of massive galaxy spheroids.


* cool.


1110.4396
Jet Power in Pre-Planetary Nebulae: Observations vs. Theory
Huggins


High velocity jets are prominent features of a wide class of planetary nebulae, but their origines not understood.  Compare current theoretical ideas on jet formation with observations of mm CO where the dynamical properties are best defined.  Jets: mass, velocity, momentum, energy; the mass and energetics of the equatorial mass-loss that typically accompanies jet formation prove to be important diagnostics (integrated approach).  Estimate key physical quantities such as binding energy of the envelope when jets are launched, and allows testing of model features using correlations between parameters.  A relatively small sample of well-observed objects find some specific scenarios for powering jets can be ruled out.


* it would have been nice to have a summary of the theories...


1110.4398
On Lya emission in z~3-6 UV-selected galaxies
Schaerer, de Barros, Stark


Examine how strength of Lya emission can be constrained from broad-band SED fits.  SED fitting tool includes the effects of nebular emission, Lya emission as free parameter.  Demonstrate with mock galaxies.  Analyze large sample of UBV and i dropout galaxies.  Find trends: fraction of galaxies with Lya emission increasing both with z and towards fainter magnitude (at fixed z); similar trends with Lya equivalent width.