Search Publications
The XMM Cluster Survey: new evidence for the 3.5-keV feature in clusters is inconsistent with a dark matter origin
Romer, A. K.; Bhargava, S.; Jeltema, T. +14 more
There have been several reports of a detection of an unexplained excess of X-ray emission at $\simeq$3.5 keV in astrophysical systems. One interpretation of this excess is the decay of sterile neutrino dark matter. The most influential study to date analysed 73 clusters observed by the XMM-Newton satellite. We explore evidence for a ≃3.5-keV exces…
Regulation of accretion by its outflow in a symbiotic star: the 2016 outflow fast state of MWC 560
Sokoloski, J. L.; Luna, G. J. M.; Munari, U. +11 more
How are accretion discs affected by their outflows? To address this question for white dwarfs accreting from cool giants, we performed optical, radio, X-ray, and ultraviolet observations of the outflow-driving symbiotic star MWC 560 (≡V694 Mon) during its 2016 optical high state. We tracked multi-wavelength changes that signalled an abrupt increas…
Rapid luminosity decline and subsequent reformation of the innermost dust distribution in the changing-look AGN Mrk 590
Minezaki, Takeo; Kokubo, Mitsuru
We examine the long-term optical/near-infrared (NIR) flux variability of a 'changing-look' active galactic nucleus (AGN) Mrk 590 between 1998 and 2007. Multiband multi-epoch optical/NIR photometry data from the SDSS Stripe 82 data base and the Multicolor Active Galactic Nuclei Monitoring (MAGNUM) project reveal that Mrk 590 experienced a sudden lu…
Inferred time-scales for common envelope ejection using wide astrometric companions
Igoshev, Andrei P.; Perets, Hagai B.; Michaely, Erez
Evolution of close binaries often proceeds through the common envelope stage. The physics of the envelope ejection (CEE) is not yet understood, and several mechanisms were suggested to be involved. These could give rise to different time-scales for the CEE mass-loss. In order to probe the CEE-time-scales we study wide companions to post-CE binarie…
Heliospheric energetic neutral atoms: Non-stationary modelling and comparison with IBEX-Hi data
Izmodenov, V. V.; Alexashov, D. B.; Baliukin, I. I.
The interstellar boundary explorer (IBEX) has been measuring fluxes of the energetic neutral atoms (ENAs) using the IBEX-Hi (0.3-6 keV) instrument since 2008. We have developed a numerical time-depended code to calculate globally distributed flux (GDF) of hydrogen ENAs employing both (1) 3D kinetic-MHD model of the global heliosphere and (2) recon…
Clustering with JWST: Constraining galaxy host halo masses, satellite quenching efficiencies, and merger rates at z = 4-10
Stark, Daniel P.; Endsley, Ryan; Rieke, Marcia +5 more
Galaxy clustering measurements can be used to constrain many aspects of galaxy evolution, including galaxy host halo masses, satellite quenching efficiencies, and merger rates. We simulate JWST galaxy clustering measurements at z ∼ 4-10 by utilizing mock galaxy samples produced by an empirical model, the UNIVERSEMACHINE. We also adopt the survey f…
Open clusters as tracers on radial migration of the galactic disc
Zhao, G.; Chen, Y. Q.
Radial migration is an important process in the Galactic disc. A few open clusters show some evidence on this mechanism but there is no systematic study. In this work, we investigate the role of radial migration on the Galactic disc based on a large sample of 146 open clusters with homogeneous metallicity and age from Netopil et al. and kinematics…
2MASS J15460752-6258042: a mid-M dwarf hosting a prolonged accretion disc
Song, Inseok; Lee, Jinhee; Murphy, Simon
We report the discovery of the oldest (∼55 Myr) mid-M type star known to host ongoing accretion. 2MASS J15460752-6258042 (2M1546, spectral type M5, 59.2 pc) shows spectroscopic signs of accretion such as strong H α, He I, and [O I] emission lines, from which we estimate an accretion rate of ∼10-10 M⊙ yr-1. Consider…
The Pan-Pacific Planet Search - VIII. Complete results and the occurrence rate of planets around low-luminosity giants
Butler, R. P.; Wittenmyer, Robert A.; Horner, Jonathan +6 more
Our knowledge of the populations and occurrence rates of planets orbiting evolved intermediate-mass stars lags behind that for solar-type stars by at least a decade. Some radial velocity surveys have targeted these low-luminosity giant stars, providing some insights into the properties of their planetary systems. Here, we present the final data re…
Assessing spectra and thermal inversions due to TiO in hot Jupiter atmospheres
Madhusudhan, Nikku; Gandhi, Siddharth; Masseron, Thomas +3 more
Recent detections of thermal inversions in the dayside atmospheres of some hot Jupiters are motivating new avenues to understand the interplay between their temperature structures and other atmospheric conditions. In particular, TiO has long been proposed to cause thermal inversions in hot Jupiters, depending on other factors such as stellar irrad…