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An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). IV. Discovery of High-redshift AGB Analogs
van Loon, J. Th.; Sonneborn, G.; Gehrz, R. D. +13 more
The survey for DUST in Nearby Galaxies with Spitzer (DUSTiNGS) identified several candidate Asymptotic Giant Branch (AGB) stars in nearby dwarf galaxies and showed that dust can form even in very metal-poor systems ({\boldsymbol{Z}}∼ 0.008 {Z}⊙ ). Here, we present a follow-up survey with WFC3/IR on the Hubble Space Telescope (HST), usin…
A Comprehensive Library of X-Ray Pulsars in the Small Magellanic Cloud: Time Evolution of Their Luminosities and Spin Periods
Coe, M. J.; Drake, J. J.; Yang, J. +3 more
We have collected and analyzed the complete archive of XMM-Newton (116), Chandra (151), and RXTE (952) observations of the Small Magellanic Cloud (SMC), spanning 1997-2014. The resulting observational library provides a comprehensive view of the physical, temporal, and statistical properties of the SMC pulsar population across the luminosity range…
Joint constraints on the Galactic dark matter halo and Galactic Centre from hypervelocity stars
Sari, R.; Marchetti, T.; Rossi, Elena M. +2 more
The mass assembly history of the Milky Way can inform both theory of galaxy formation and the underlying cosmological model. Thus, observational constraints on the properties of both its baryonic and dark matter contents are sought. Here, we show that hypervelocity stars (HVSs) can in principle provide such constraints. We model the observed veloc…
Seasonal erosion and restoration of the dust cover on comet 67P/Churyumov-Gerasimenko as observed by OSIRIS onboard Rosetta
Jorda, L.; Lamy, P. L.; Lara, L. M. +51 more
Context. Dust deposits or dust cover are a prevalent morphology in the northern hemi-nucleus of comet 67P/Churyumov-Gerasimenko (67P). The evolution of the dust deposits was captured by the OSIRIS camera system onboard the Rosetta spacecraft having escorted the comet for over two years. The observations shed light on the fundamental role of cometa…
The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV
Harrison, F. A.; Stern, D.; Alexander, D. M. +27 more
We identify sources with extremely hard X-ray spectra (I.e., with photon indices of {{Γ }}≲ 0.6) in the 13 deg2 NuSTAR serendipitous survey, to search for the most highly obscured active galactic nuclei (AGNs) detected at > 10 {keV}. Eight extreme NuSTAR sources are identified, and we use the NuSTAR data in combination with lower-ene…
Interpreting the Strongly Lensed Supernova iPTF16geu: Time Delay Predictions, Microlensing, and Lensing Rates
Lee, Chien-Hsiu; Oguri, Masamune; Suyu, Sherry H. +2 more
We present predictions for time delays between multiple images of the gravitationally lensed supernova, iPTF16geu, which was recently discovered from the intermediate Palomar Transient Factory (iPTF). As the supernova is of Type Ia where the intrinsic luminosity is usually well known, accurately measured time delays of the multiple images could pr…
Observations of the GRB Afterglow ATLAS17aeu and Its Possible Association with GW 170104
Inserra, C.; Rest, A.; Smartt, S. J. +26 more
We report the discovery and multiwavelength data analysis of the peculiar optical transient, ATLAS17aeu. This transient was identified in the sky map of the LIGO gravitational wave event GW 170104 by our ATLAS and Pan-STARRS coverage. ATLAS17aeu was discovered 23.1 hr after GW 170104 and rapidly faded over the next three nights, with a spectrum re…
Halogens as tracers of protosolar nebula material in comet 67P/Churyumov-Gerasimenko
Neefs, Eddy; Mall, Urs; De Keyser, Johan +26 more
We report the first in situ detection of halogens in a cometary coma, that of 67P/Churyumov-Gerasimenko. Neutral gas mass spectra collected by the European Space Agency's Rosetta spacecraft during four periods of interest from the first comet encounter up to perihelion indicate that the main halogen-bearing compounds are HF, HCl and HBr. The bulk …
The puzzling case of the radio-loud QSO 3C 186: a gravitational wave recoiling black hole in a young radio source?
Bianchi, S.; Macchetto, F. D.; Capetti, A. +14 more
Context. Radio-loud active galactic nuclei with powerful relativistic jets are thought to be associated with rapidly spinning black holes (BHs). BH spin-up may result from a number of processes, including accretion of matter onto the BH itself, and catastrophic events such as BH-BH mergers.
Aims: We study the intriguing properties of the powe…
The Very Low Albedo of WASP-12b from Spectral Eclipse Observations with Hubble
Nikolov, Nikolay; Gibson, Neale P.; Sing, David K. +11 more
We present an optical eclipse observation of the hot Jupiter WASP-12b using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. These spectra allow us to place an upper limit of {A}g< 0.064 (97.5% confidence level) on the planet’s white light geometric albedo across 290-570 nm. Using six wavelength bins acro…