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Variegation of comet 67P/Churyumov-Gerasimenko in regions showing activity
Jorda, L.; Lamy, P. L.; Lara, L. M. +49 more
Aims.We carried out an investigation of the surface variegation of comet 67P/Churyumov-Gerasimenko, the detection of regions showing activity, the determination of active and inactive surface regions of the comet with spectral methods, and the detection of fallback material.
Methods: We analyzed multispectral data generated with Optical, Spec…
New Parallaxes and a Convergence Analysis for the TW Hya Association
Faherty, J. K.; Weinberger, A. J.; Gagné, J. +3 more
The TW Hya Association (TWA) is a nearby stellar association with an age of ∼5-10 Myr. This is an important age for studying the late stages of star and planet formation. We measure the parallaxes of 14 candidate members of TWA. That brings to 38 the total number of individual stars with fully measured kinematics, I.e., proper motion, radial veloc…
Gamma-ray emission from SN2014J near maximum optical light
Sunyaev, R.; Churazov, E.; Hernanz, M. +17 more
Context. The optical light curve of Type Ia supernovae (SNIa) is powered by thermalized gamma-rays produced by the decay of 56Ni and 56Co, the main radioactive isotopes synthesized by the thermonuclear explosion of a C/O white dwarf.
Aims: Gamma-rays escaping the ejecta can be used as a diagnostic tool for studying the c…
Global Gradients for Cosmic-Ray Protons in the Heliosphere During the Solar Minimum of Cycle 23/24
Potgieter, M. S.; Vos, E. E.
Global gradients for cosmic-ray (CR) protons in the heliosphere are computed with a comprehensive modulation model for the recent prolonged solar minimum of Cycle 23/24. Fortunately, the PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) and Ulysses/KET (Kiel Electron Telescope) instruments simultaneously observed pro…
Titan's temporal evolution in stratospheric trace gases near the poles
Nixon, Conor A.; Achterberg, Richard K.; Flasar, F. Michael +7 more
We analyze spectra acquired by the Cassini/Composite Infrared Spectrometer (CIRS) at high resolution from October 2010 until September 2014 in nadir mode. Up until mid 2012, Titan's Northern atmosphere exhibited the enriched chemical content found since the Voyager days (November 1980), with a peak around the Northern Spring Equinox (NSE) in 2009.…
The abundance and thermal history of water ice in the disk surrounding HD 142527 from the DIGIT Herschel Key Program
Waters, L. B. F. M.; Woitke, P.; Hony, S. +9 more
Context. The presence or absence of ice in protoplanetary disks is of great importance to the formation of planets. By enhancing solid surface density and increasing sticking efficiency, ice catalyzes the rapid formation of planetesimals and decreases the timescale of giant planet core accretion.
Aims: In this paper, we analyze the compositio…
Star formation laws in the Andromeda galaxy: gas, stars, metals and the surface density of star formation
Barmby, P.; Lianou, S.; Rahmani, S.
We use hierarchical Bayesian regression analysis to investigate star formation laws in the Andromeda galaxy (M31) in both local (30, 155 and 750 pc) and global cases. We study and compare the well-known Kennicutt-Schmidt law, the extended Schmidt law and the metallicity/star formation correlation. Using a combination of Hα and 24 µm emission…
Peak-ring structure and kinematics from a multi-disciplinary study of the Schrödinger impact basin
Kramer, Georgiana Y.; Collins, Gareth S.; Kring, David A. +2 more
The Schrödinger basin on the lunar farside is ~320 km in diameter and the best-preserved peak-ring basin of its size in the Earth-Moon system. Here we present spectral and photogeologic analyses of data from the Moon Mineralogy Mapper instrument on the Chandrayaan-1 spacecraft and the Lunar Reconnaissance Orbiter Camera (LROC) on the LRO spacecraf…
Internetwork magnetic field as revealed by two-dimensional inversions
Danilovic, S.; van Noort, M.; Rempel, M.
Context. Properties of magnetic field in the internetwork regions are still fairly unknown because of rather weak spectropolarimetric signals.
Aims: We address the matter by using the two-dimensional (2D) inversion code, which is able to retrieve the information on smallest spatial scales up to the diffraction limit, while being less suscepti…
Distributions of Quasar Hosts on the Galaxy Main Sequence Plane
Rieke, George H.; Shi, Yong; Zhang, Zhoujian +4 more
The relation between star formation rates (SFRs) and stellar masses, I.e., the galaxy main sequence, is a useful diagnostic of galaxy evolution. We present the distributions relative to the main sequence of 55 optically selected PG and 12 near-IR-selected Two Micron All Sky Survey (2MASS) quasars at z ≤ 0.5. We estimate the quasar host stellar mas…