Search Publications
Constraining the initial conditions of NGC 2264 using ejected stars found in Gaia DR2
Parker, Richard J.; Schoettler, Christina; de Bruijne, Jos
Fast, ejected stars have been found around several young star-forming regions, such as the Orion Nebula Cluster. These ejected stars can be used to constrain the initial density, spatial and kinematic substructure when compared to predictions from N-body simulations. We search for runaway and slower walkaway stars using Gaia Data Release 2 (DR2) w…
Revisiting WASP-47 with ESPRESSO and TESS
Bayliss, Daniel; Bryant, Edward M.
WASP-47 hosts a remarkable planetary system containing a hot Jupiter (WASP-47 b; P = 4.159 days) with an inner super-Earth (WASP-47 e; P = 0.7896 days), a close-orbiting outer Neptune (WASP-47 d; P = 9.031 days), and a long-period giant planet (WASP-47 c; P = 588.4 days). We use the new Transiting Exoplanet Survey Satellite (TESS) photometry to re…
Magnetic Field Intermittency in the Solar Wind: Parker Solar Probe and SolO Observations Ranging from the Alfvén Region up to 1 AU
Fedorov, A.; Louarn, P.; Velli, Marco +19 more
Parker Solar Probe (PSP) and SolO data are utilized to investigate magnetic field intermittency in the solar wind (SW). Small-scale intermittency (20-100 d i ) is observed to radially strengthen when methods relying on higher-order moments are considered (SF q ; SDK), but no clear trend is observed at larger scales. However,…
A tale of caution: the tails of NGC 752 are much longer than claimed
Wang, Long; Boffin, Henri M. J.; Jerabkova, Tereza +1 more
Understanding the exact extent and content of tidal tails of open clusters provides useful clues on how field stars populate the Milky Way. We reanalyse, using Gaia EDR3 data, the tails around the open cluster NGC 752. Compared to previous analyses, we look at a much wider region around the cluster and use first the convergent point method, couple…
SKYSURF: Constraints on Zodiacal Light and Extragalactic Background Light through Panchromatic HST All-sky Surface-brightness Measurements. I. Survey Overview and Methods
Pirzkal, Nor; Casertano, Stefano; Driver, Simon P. +35 more
We give an overview and describe the rationale, methods, and testing of the Hubble Space Telescope (HST) Archival Legacy project "SKYSURF." SKYSURF uses HST's unique capability as an absolute photometer to measure the ~0.2-1.7 µm sky-surface brightness (sky-SB) from 249,861 WFPC2, ACS, and WFC3 exposures in ~1400 independent HST fields. SKYS…
Properties of the interstellar medium in star-forming galaxies at redshifts 2 ≤ z ≤ 5 from the VANDELS survey
Schaerer, D.; Castellano, M.; Pentericci, L. +16 more
Gaseous flows inside and outside galaxies are key to understanding galaxy evolution, as they regulate their star formation activity and chemical enrichment across cosmic time. We study the interstellar medium (ISM) kinematics of a sample of 330 galaxies with C III] or He II emission using far-ultraviolet (far-UV) ISM absorption lines detected in t…
Supernova Remnants in M83 as Observed with MUSE
Della Bruna, Lorenza; Blair, William P.; Adamo, Angela +4 more
Here we describe a new study of the supernova remnants (SNRs) and SNR candidates in nearby face-on spiral galaxy M83, based primarily on MUSE integral field spectroscopy. Our revised catalog of SNR candidates in M83 has 366 objects, 81 of which are reported here for the first time. Of these, 229 lie within the MUSE observation region, 160 of which…
Localizing narrow Fe Kα emission within bright AGN
Brandt, William N.; Ricci, Claudio; Bauer, Franz E. +11 more
Context. The 6.4 keV Fe Kα emission line is a ubiquitous feature in X-ray spectra of active galactic nuclei (AGN), and its properties track the interaction between the variable primary X-ray continuum and the surrounding structure from which it arises.
Aims: We clarify the nature and origin of the narrow Fe Kα emission using X-ray spectral, t…
A NICER look at thermonuclear X-ray bursts from Aql X-1
Göğüş, Ersin; Chakrabarty, Deepto; Guillot, Sebastien +8 more
We present spectral and temporal properties of all the thermonuclear X-ray bursts observed from Aql X-1 by the Neutron Star Interior and Composition Explorer (NICER) between 2017 July and 2021 April. This is the first systematic investigation of a large sample of type I X-ray bursts from Aql X-1 with improved sensitivity at low energies. We detect…
Can Gaia find planets around white dwarfs?
Bonsor, Amy; Sanderson, Hannah; Mustill, Alexander
The Gaia spacecraft presents an unprecedented opportunity to reveal the population of long period (a > 1 au) exoplanets orbiting stars across the H-R diagram, including white dwarfs. White dwarf planetary systems have played an important role in the study of planetary compositions, from their unique ability to provide bulk elemental abundances …