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Hot exozodiacal dust: an exocometary origin?
Augereau, J. -C.; Sezestre, É.; Thébault, P.
Context. Near- and mid-infrared interferometric observations have revealed populations of hot and warm dust grains populating the inner regions of extrasolar planetary systems. These are known as exozodiacal dust clouds, or exozodis, reflecting the similarity with the solar system's zodiacal cloud. Radiative transfer models have constrained the du…
Neutral carbon and highly excited CO in a massive star-forming main sequence galaxy at z = 2.2
Daddi, Emanuele; Aravena, Manuel; Decarli, Roberto +5 more
We used the Plateau De Bure Interferometer to observe multiple CO and neutral carbon transitions in a z = 2.2 main sequence disk galaxy, BX610. Our observation of CO(7-6), CO(4-3), and both far-infrared (FIR) [CI] lines complements previous observations of Hα and low-J CO, and reveals a galaxy that is vigorously forming stars with UV fields (Log(G…
A Closer Look at Some Gas-phase Depletions in the ISM: Trends for O, Ge, and Kr versus {F}_{* }, f(H2), and Starlight Intensity
Jenkins, Edward B.
In a survey of archived ultraviolet spectra of 100 stars recorded by the echelle spectrograph of the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, we measure the strengths of the weak absorption features of O I, Ge II, and Kr I in the interstellar medium. Our objective is to undertake an investigation that goes beyond earlier…
Compositional variations of Titan's impact craters indicates active surface erosion
Janssen, M. A.; Cassini Radar Team; Werynski, A. +2 more
Titan, the only moon in the solar system with a considerable atmosphere, is host to a variety of exogenic processes that shape its surface. These processes form features that are quite similar to features on Earth, including sand dunes, rivers, and lakes. The combination of a thick atmosphere and active surface processes also leads to a scarcity o…
The water line emission and ortho-to-para ratio in the Orion Bar photon-dominated region
Le Petit, F.; Roueff, E.; Lis, D. C. +2 more
Context. The ortho-to-para ratio (OPR) of water in the interstellar medium (ISM) is often assumed to be related to the formation temperature of water molecules, making it a potentially interesting tracer of the thermal history of interstellar gas.
Aims: A very low OPR of 0.1-0.5 was previously reported in the Orion Bar photon-dominated region…
Interaction of SN Ib 2004dk with a Previously Expelled Envelope
Wheeler, J. Craig; Silverman, Jeffrey M.; Pooley, David +7 more
The interaction between the expanding supernova (SN) ejecta with the circumstellar material (CSM) that was expelled from the progenitor prior to explosion is a long-sought phenomenon, yet observational evidence is scarce. Here we confirm a new example: SN 2004dk, originally a hydrogen-poor, helium-rich Type Ib SN that reappeared as a strong {{H}}α…
Numerical Algorithm for Detecting Ion Diffusion Regions in the Geomagnetic Tail With Applications to MMS Tail Season 1 May to 30 September 2017
Farrugia, C. J.; Torbert, R. B.; Rogers, A. J.
We present a numerical algorithm to identify ion diffusion regions (IDRs) in the geomagnetic tail and test its applicability. We use five criteria applied in three stages. (i) correlated reversals (within 90 s) of Vx and Bz (at least 2 nT about 0; geocentric solar magnetospheric coordinates); (ii) detection of Hall electric a…
Stellar populations of galaxies in the ALHAMBRA survey up to z ∼ 1. IV. Properties of quiescent galaxies on the stellar mass-size plane
Cenarro, A. J.; López-Sanjuan, C.; Perea, J. +7 more
Aims: We perform a comprehensive study of the stellar population properties (formation epoch, age, metallicity, and extinction) of quiescent galaxies as a function of size and stellar mass to constrain the physical mechanism governing the stellar mass assembly and the likely evolutive scenarios that explain their growth in size.
Methods:…
The blue straggler population of the old open cluster Berkeley 17
Chen, W. P.; Beccari, Giacomo; Vaidya, Kaushar +1 more
Context. Blue straggler stars (BSSs) are observed in Galactic globular clusters and old open clusters. The radial distribution of BSSs has been used to diagnose the dynamical evolution of globular clusters. For the first time, with a reliable sample of BSSs identified with Gaia DR2, we conduct such an analysis for an open cluster.
Aims: We ai…
Detection and Classification of Supernovae Beyond z ∼ 2 Redshift with the James Webb Space Telescope
Vinkó, József; Regős, Enikő
Future time-domain surveys for transient events in the near- and midinfrared bands will significantly extend our understanding about the physics of the early universe. In this paper we study the implications of a deep (∼27 mag), long-term (∼3 yr), observationally inexpensive survey with the James Webb Space Telescope (JWST) within its Continuous V…