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The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster
Anderson, J.; Tremblay, P. -E.; Stetson, P. B. +13 more
We present a new distance determination to the Galactic globular cluster 47 Tucanae by fitting the spectral energy distributions of its white dwarfs (WDs) to pure hydrogen atmosphere WD models. Our photometric data set is obtained from a 121-orbit Hubble Space Telescope program using the Wide Field Camera 3 UVIS/IR channels, capturing F390W, F606W…
Late Hesperian aqueous alteration at Majuro crater, Mars
Mangold, N.; Poulet, F.; Ansan, V. +3 more
Impact craters cover a large portion of the surface of Mars and could constitute a significant exobiology research target as their formation provided heat sources for aqueous processes. To date, only rare examples of hydrothermal alteration in craters have been reported on Mars while many studies have focused on modeling their effect. Using data f…
A Herschel Survey of Cold Dust in Disks around Brown Dwarfs and Low-mass Stars
Pascucci, Ilaria; Henning, Thomas; Ménard, François +6 more
We report the complete photometric results from our Herschel study which is the first comprehensive program to search for far-infrared emission from cold dust around young brown dwarfs (BDs). We surveyed 50 fields containing 51 known or suspected BDs and very low mass stars that have evidence of circumstellar disks based on Spitzer photometry and/…
Luminous and High Stellar Mass Candidate Galaxies at z ≈ 8 Discovered in the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +26 more
One key goal of the Hubble Space Telescope Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey is to track galaxy evolution back to z ≈ 8. Its two-tiered "wide and deep" strategy bridges significant gaps in existing near-infrared surveys. Here we report on z ≈ 8 galaxy candidates selected as F105W-band dropouts in one of its deep fields…
The Unusual Temporal and Spectral Evolution of SN2011ht. II. Peculiar Type IIn or Impostor?
Humphreys, Roberta M.; Davidson, Kris; Pogge, R. W. +4 more
SN2011ht has been described both as a true supernova (SN) and as an impostor. In this paper, we conclude that it does not match some basic expectations for a core-collapse event. We discuss SN2011ht's spectral evolution from a hot dense wind to a cool dense wind, followed by the post-plateau appearance of a faster low density wind during a rapid d…
Modelling of the ultraviolet and visual SED variability in the hot magnetic Ap star CU Virginis
Shulyak, D.; Krtička, J.; Lüftinger, T. +4 more
Context. The spectral energy distribution (SED) in chemically peculiar stars may be significantly affected by their abundance anomalies. The observed SED variations are usually assumed to be a result of inhomogeneous surface distribution of chemical elements, flux redistribution and stellar rotation. However, the direct evidence for this is still …
Luminous Satellites. II. Spatial Distribution, Luminosity Function, and Cosmic Evolution
Treu, T.; Auger, M. W.; Fassnacht, C. D. +3 more
We infer the normalization and the radial and angular distributions of the number density of satellites of massive galaxies (log10[M*h/M ⊙] > 10.5) between redshifts 0.1 and 0.8 as a function of host stellar mass, redshift, morphology, and satellite luminosity. Exploiting the depth and resolution of the COSMOS H…
Identification of HESS J1303-631 as a pulsar wind nebula through γ-ray, X-ray, and radio observations
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +195 more
Aims: The previously unidentified very high-energy (VHE; E > 100 GeV) γ-ray source HESS J1303-631, discovered in 2004, is re-examined including new data from the H.E.S.S. Cherenkov telescope array in order to identify this object. Archival data from the XMM-Newton X-ray satellite and from the PMN radio survey are also examined.
Method…
Climate-driven deposition of water ice and the formation of mounds in craters in Mars’ north polar region
Le Mouélic, Stéphane; Conway, Susan J.; Orosei, Roberto +4 more
This paper explores the origins and evolution of ice-rich interior mounds found within craters of the north polar region of Mars. We present a systematic study of impact craters above 65°N, and identify 18 craters that have interior mounds. At least 11 of these mounds are composed of water ice and geometric similarities suggest that dune-covered m…
The Relationship between the Sudden Change of the Lorentz Force and the Magnitude of Associated Flares
Liu, Chang; Wang, Haimin; Wang, Shuo
The rapid and irreversible change of photospheric magnetic fields associated with flares has been confirmed by many recent studies. These studies showed that the photospheric magnetic fields respond to coronal field restructuring and turn to a more horizontal state near the magnetic polarity inversion line (PIL) after eruptions. Recent theoretical…