Search Publications
Expanding Bipolar X-Ray Structure After the 2006 Eruption of RS Oph
Mukai, K.; Sokoloski, J. L.; Luna, G. J. M. +2 more
We report on the detection and analysis of extended X-ray emission by the Chandra X-ray Observatory stemming from the 2006 eruption of the recurrent nova RS Oph. The extended emission was detected 1254 and 1927 days after the start of the 2006 eruption and is consistent with a bipolar flow oriented in the East-West direction of the sky with openin…
Do AGN triggering mechanisms vary with radio power? - II. The importance of mergers as a function of radio power and optical luminosity
Tadhunter, C. N.; Ramos Almeida, C.; Pierce, J. C. S. +7 more
Investigation of the triggering mechanisms of radio active galactic nuclei (radio AGN) is important for improving our general understanding of galaxy evolution. In the first paper in this series, detailed morphological analysis of high-excitation radio galaxies (HERGs) with intermediate radio powers suggested that the importance of triggering via …
Successive deuteration in low-mass star-forming regions: The case of D2-methanol (CHD2OH) in IRAS 16293-2422
Margulès, Laurent; Drozdovskaya, Maria N.; Jørgensen, Jes K. +3 more
Context. Di-deuterated molecules are observed in the earliest stages of star formation at abundances of a few percent relative to their nondeuterated isotopologs, which is unexpected considering the scarcity of deuterium in the interstellar medium. With sensitive observations leading to the detection of a steadily increasing number of di-deuterate…
Quasars with Proper Motions and the Link to Double and Multiple AGNs
Secrest, Nathan J.; Makarov, Valeri V.
Gaia used a large sample of photometrically selected active galactic nuclei (AGNs) and quasars to remove the residual spin of its global proper motion system in order to achieve a maximally inertial reference frame. A small fraction of these reference objects have statistically significant astrometric proper motions in Gaia EDR3. We compile a sour…
A scaled-up planetary system around a supernova progenitor
Quanz, S. P.; Henning, T.; Mayer, L. +24 more
Context. Virtually all known exoplanets reside around stars with M < 2.3 M⊙ either due to the rapid evaporation of the protostellar disks or to selection effects impeding detections around more massive stellar hosts.
Aims: To clarify if this dearth of planets is real or a selection effect, we launched the planet-hunting B-star E…
The Impact of Energetic Particles on the Martian Ionosphere During a Full Solar Cycle of Radar Observations: Radar Blackouts
Witasse, Olivier; Orosei, Roberto; Lester, Mark +13 more
We present the first long-term characterization of ionization layers in the lower ionosphere of Mars (below ∼90 km), a region inaccessible to orbital in-situ observations, based on an analysis of radar echo blackouts observed on Mars Express and the Mars Reconnaissance Orbiter from 2006 to 2017. A blackout occurs when the expected surface reflecti…
Mixing Interstellar Clouds Surrounding the Sun
Zank, Gary P.; Redfield, Seth; Winslow, Réka M. +9 more
On its journey through the Galaxy, the Sun passes through diverse regions of the interstellar medium. High-resolution spectroscopic measurements of interstellar absorption lines in spectra of nearby stars show absorption components from more than a dozen warm partially ionized clouds within 15 pc of the Sun. The two nearest clouds-the Local Inters…
A new reference catalogue for the very metal-poor Universe: +150 OB stars in Sextans A
Herrero, A.; Castro, N.; Najarro, F. +3 more
Local Group (LG) very metal-poor massive stars are the best proxy for the First Stars of the Universe and fundamental to modelling the evolution of early galaxies. These stars may follow new evolutionary pathways restricted to very low metallicities, such as chemically homogeneous evolution (CHE). However, given the great distance leap needed to r…
A CO isotopologue Line Atlas within the Whirlpool galaxy Survey (CLAWS)
Kruijssen, J. M. Diederik; Leroy, Adam K.; Rosolowsky, Erik +24 more
We present the CO isotopologue Line Atlas within the Whirpool galaxy Survey (CLAWS), which is based on an IRAM 30 m large programme that provides a benchmark study of numerous faint CO isotopologues in the millimetre-wavelength regime across the full disc of the nearby grand-design spiral galaxy M 51 (NGC 5194). The survey's core goal is to use th…
Kepler-167e as a Probe of the Formation Histories of Cold Giants with Inner Super-Earths
Knutson, Heather A.; Fulton, Benjamin J.; Howard, Andrew W. +6 more
The observed correlation between outer giant planets and inner super-Earths is emerging as an important constraint on planet formation theories. In this study, we focus on Kepler-167, which is currently the only system known to contain both inner transiting super-Earths and a confirmed outer transiting gas giant companion beyond 1 au. Using long-t…