Search Publications
Survey of Cold Water Lines in Protoplanetary Disks: Indications of Systematic Volatile Depletion
van Dishoeck, Ewine F.; Fedele, Davide; Lis, Dariusz C. +11 more
We performed very deep searches for 2 ground-state water transitions in 13 protoplanetary disks with the HIFI instrument on board the Herschel Space Observatory, with integration times up to 12 hr per line. We also searched for, with shallower integrations, two other water transitions that sample warmer gas. The detection rate is low, and the uppe…
Chasing obscuration in type-I AGN: discovery of an eclipsing clumpy wind at the outer broad-line region of NGC 3783
Kaastra, J. S.; Kriss, G. A.; Arav, N. +21 more
In 2016 we carried out a Swift monitoring programme to track the X-ray hardness variability of eight type-I AGN over a year. The purpose of this monitoring was to find intense obscuration events in AGN, and thereby study them by triggering joint XMM-Newton, NuSTAR, and HST observations. We successfully accomplished this for NGC 3783 in December 20…
Evidence for a radiatively driven disc-wind in PDS 456?
Tombesi, F.; Reeves, J. N.; Braito, V. +5 more
We present a newly discovered correlation between the wind outflow velocity and the X-ray luminosity in the luminous (Lbol ∼ 1047erg s - 1) nearby (z = 0.184) quasar PDS 456. All the contemporary XMM-Newton, NuSTAR and Suzaku observations from 2001-2014 were revisited and we find that the centroid energy of the blu…
Extreme jet ejections from the black hole X-ray binary V404 Cygni
Gurwell, M.; Russell, D. M.; Fender, R. +14 more
We present simultaneous radio through sub-mm observations of the black hole X-ray binary (BHXB) V404 Cygni during the most active phase of its June 2015 outburst. Our 4 h long set of overlapping observations with the Very Large Array, the Sub-millimeter Array and the James Clerk Maxwell Telescope (SCUBA-2) covers eight different frequency bands (i…
Luminosity dependence of the cyclotron line and evidence for the accretion regime transition in V 0332+53
Doroshenko, Victor; Tsygankov, Sergey S.; Mushtukov, Alexander A. +4 more
We report on the analysis of NuSTAR observations of the Be-transient X-ray pulsar V 0332+53 during the giant outburst in 2015 and another minor outburst in 2016. We confirm the cyclotron-line energy-luminosity correlation previously reported in the source and the line energy decrease during the giant outburst. Based on 2016 observations, we find t…
Spectral Changes in the Hyperluminous Pulsar in NGC 5907 as a Function of Super-orbital Phase
Harrison, F. A.; Stern, D.; Bachetti, M. +5 more
We present broadband, multi-epoch X-ray spectroscopy of the pulsating ultra-luminous X-ray source (ULX) in NGC 5907. Simultaneous XMM-Newton and NuSTAR data from 2014 are best described by a multicolor blackbody model with a temperature gradient as a function of accretion disk radius significantly flatter than expected for a standard thin accretio…
The MUSE Hubble Ultra Deep Field Survey. X. Lyα equivalent widths at 2.9 < z < 6.6
Inami, H.; Richard, J.; Verhamme, A. +17 more
We present rest-frame Lyα equivalent widths (EW0) of 417 Lyα emitters (LAEs) detected with Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT) at 2.9 <z< 6.6 in the Hubble Ultra Deep Field. Based on the deep MUSE spectroscopy and ancillary Hubble Space Telescope (HST) photometry data, we carefully measured E…
Changes in Jupiter's Zonal Wind Profile preceding and during the Juno mission
Wong, Michael H.; Atreya, Sushil K.; Orton, Glenn S. +8 more
We present five epochs of WFC3 HST Jupiter observations taken between 2009-2016 and extract global zonal wind profiles for each epoch. Jupiter's zonal wind field is globally stable throughout these years, but significant variations in certain latitude regions persist. We find that the largest uncertainties in the wind field are due to vortices or …
MMS Observation of Magnetic Reconnection in the Turbulent Magnetosheath
Lavraud, B.; Vaivads, A.; Le Contel, O. +30 more
In this paper we use the full armament of the MMS (Magnetospheric Multiscale) spacecraft to study magnetic reconnection in the turbulent magnetosheath downstream of a quasi-parallel bow shock. Contrarily to the magnetopause and magnetotail cases, only a few observations of reconnection in the magnetosheath have been reported. The case study in thi…
Three’s Company: An Additional Non-transiting Super-Earth in the Bright HD 3167 System, and Masses for All Three Planets
Henning, Thomas; Butler, R. Paul; Vogt, Steven S. +55 more
HD 3167 is a bright (V = 8.9), nearby K0 star observed by the NASA K2 mission (EPIC 220383386), hosting two small, short-period transiting planets. Here we present the results of a multi-site, multi-instrument radial-velocity campaign to characterize the HD 3167 system. The masses of the transiting planets are 5.02 ± 0.38 {M}\oplus for…