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ASASSN-15lh: A Superluminous Ultraviolet Rebrightening Observed by Swift and Hubble
Baade, Dietrich; Wang, Lifan; Wheeler, J. Craig +9 more
We present and discuss ultraviolet and optical photometry from the Ultraviolet/Optical Telescope, X-ray limits from the X-Ray Telescope on Swift, and imaging polarimetry and ultraviolet/optical spectroscopy with the Hubble Space Telescope, all from observations of ASASSN-15lh. It has been classified as a hydrogen-poor superluminous supernova (SLSN…
Changes in the Physical Environment of the Inner Coma of 67P/Churyumov-Gerasimenko with Decreasing Heliocentric Distance
Jorda, L.; Lamy, P. L.; Lara, L. M. +43 more
The Wide Angle Camera of the OSIRIS instrument on board the Rosetta spacecraft is equipped with several narrow-band filters that are centered on the emission lines and bands of various fragment species. These are used to determine the evolution of the production and spatial distribution of the gas in the inner coma of comet 67P with time and helio…
Lightning climatology of exoplanets and brown dwarfs guided by Solar system data
Helling, Ch.; Hodosán, G.; Asensio-Torres, R. +2 more
Clouds form on extrasolar planets and brown dwarfs where lightning could occur. Lightning is a tracer of atmospheric convection, cloud formation and ionization processes as known from the Solar system, and may be significant for the formation of prebiotic molecules. We study lightning climatology for the different atmospheric environments of Earth…
Anatomy of outbursts and quiescent activity of Comet 29P/Schwassmann-Wachmann
Roche, Paul; Mottola, Stefano; Miles, Richard +4 more
Detailed morphological and photometric characterisation of Comet 29P in the optical region is presented comprising: (a) multi-filter observations of the outburst coma in 2010-2012 with the 2.0-m Faulkes Telescopes (FT); (b) high-cadence, high-precision photometry in May-September 2014; and (c) HST observations in March 1996 (WFPC2/F702W filter). O…
HST Grism Confirmation of Two z ∼ 2 Structures from the Clusters around Radio-loud AGN (CARLA) Survey
Noirot, Gaël; Gonzalez, Anthony H.; Stern, Daniel +10 more
Using Hubble Space Telescope slitless grism data, we report the spectroscopic confirmation of two distant structures at z∼ 2 associated with powerful high-redshift radio-loud active galactic nuclei (AGNs). These rich structures, likely (forming) clusters, are among the most distant structures currently known, and were identified on the basis of Sp…
The first observation of an intermediate flare from SGR 1935+2154
Hurley, K.; Zhang, X. -L.; Israel, G. L. +8 more
We report on the bright burst detected by four Interplanetary network (IPN) spacecraft on 2015 April 12. The IPN localization of the source is consistent with the position of the recently discovered soft gamma-repeater SGR 1935+2154. From the Konus-Wind (KW) observation, we derive temporal and spectral parameters of the emission, and the burst ene…
Inflation in the closed FLRW model and the CMB
Bonga, Béatrice; Gupt, Brajesh; Yokomizo, Nelson
Recent cosmic microwave background (CMB) observations put strong constraints on the spatial curvature via estimation of the parameter Ωk assuming an almost scale invariant primordial power spectrum. We study the evolution of the background geometry and gauge-invariant scalar perturbations in an inflationary closed FLRW model and calcula…
Submillimeter Polarization Spectrum in the Vela C Molecular Cloud
Ward-Thompson, Derek; Fissel, Laura M.; Nakamura, Fumitaka +27 more
Polarization maps of the Vela C molecular cloud were obtained at 250, 350, and 500 µm during the 2012 flight of the balloon-borne telescope BLASTPol. These measurements are used in conjunction with 850 µm data from Planck to study the submillimeter spectrum of the polarization fraction for this cloud. The spectrum is relatively flat an…
X-ray and radio emission from the luminous supernova 2005kd
Bauer, F. E.; Dwarkadas, V. V.; Romero-Cañizales, C. +1 more
SN 2005kd is among the most luminous supernovae (SNe) to be discovered at X-ray wavelengths. We have re-analysed all good angular resolution (better than 20 arcsec full width at half-maximum point spread function) archival X-ray data for SN 2005kd. The data reveal an X-ray light curve that decreases as t-1.62±0.06. Our modelling of the …
CFHTLenS and RCSLenS cross-correlation with Planck lensing detected in fourier and configuration space
Heymans, Catherine; Moutard, Thibaud; Harnois-Déraps, Joachim +13 more
We measure the cross-correlation signature between the Planck cosmic microwave background (CMB) lensing map and the weak lensing observations from both the Red-sequence Cluster Lensing Survey and the Canada-France-Hawaii Telescope Lensing Survey. In addition to a Fourier analysis, we include the first configuration-space detection, based on the es…