Search Publications
Hidden in the haystack: low-luminosity globular clusters towards the Milky Way bulge
Rejkuba, M.; Zoccali, M.; Rojas-Arriagada, A. +8 more
Recent wide-area surveys have enabled us to study the Milky Way with unprecedented detail. Its inner regions, hidden behind dust and gas, have been partially unveiled with the arrival of near-infrared (IR) photometric and spectroscopic data sets. Among recent discoveries, there is a population of low-mass globular clusters, known to be missing, es…
The white dwarf binary pathways survey - VI. Two close post-common envelope binaries with TESS light curves
Gänsicke, B. T.; Rebassa-Mansergas, A.; Raddi, R. +9 more
Establishing a large sample of post-common-envelope binaries (PCEBs) that consist of a white dwarf plus an intermediate mass companion star of spectral type AFGK, offers the potential to provide new constraints on theoretical models of white dwarf binary formation and evolution. Here, we present a detailed analysis of two new systems, TYC 110-755-…
Kepler and the Behemoth: Three Mini-Neptunes in a 40 Million Year Old Association
Bouma, L. G.; Bieryla, A.; Latham, D. W. +8 more
Stellar positions and velocities from Gaia are yielding a new view of open cluster dispersal. Here we present an analysis of a group of stars spanning Cepheus (l = 100°) to Hercules (l = 40°), hereafter the Cep-Her complex. The group includes four Kepler objects of interest: Kepler-1643 b (R p = 2.32 ± 0.13 R ⊕, P = 5.3 days)…
Asteroseismology of RR Lyrae stars with non-radial modes
Smolec, Radosław; Netzel, Henryka
The additional signals observed in the frequency spectra of the first-overtone RR Lyrae stars, which form a period ratio around 0.61 with the period of the first overtone, are a common phenomenon for RRc and RRd stars, as well as for first-overtone classical Cepheids. The recently proposed model explains these signals as harmonics of non-radial mo…
The Mantis Network II: examining the 3D high-resolution observable properties of the UHJs WASP-121b and WASP-189b through GCM modelling
Lee, Elspeth K. H.; Heng, Kevin; Tsai, Shang-Min +4 more
The atmospheres of ultra hot Jupiters (UHJs) are prime targets for the detection of molecules and atoms at both low and high spectral resolution. We study the atmospheres of the UHJs WASP-121b and WASP-189b by performing 3D general circulation models (GCMs) of these planets using high temperature correlated-k opacity schemes with ultra-violet (UV)…
Forward fitting STIX visibilities
Volpara, Anna; Massa, Paolo; Krucker, Säm +6 more
Aims: We seek to determine to what extent the problem of forward fitting visibilities measured by the Spectrometer/Telescope Imaging X-rays (STIX) on board Solar Orbiter becomes more challenging with respect to the same problem in the case of previous hard X-ray solar imaging missions. In addition, we aim to identify an effective optimization…
Lyα Escape from Low-mass, Compact, High-redshift Galaxies
Reddy, Naveen A.; Shivaei, Irene; Dey, Arjun +5 more
We investigate the effects of stellar populations and sizes on Lyα escape in 27 spectroscopically confirmed and 35 photometric Lyα emitters (LAEs) at z ≈ 2.65 in seven fields of the Boötes region of the NOAO Deep Wide-Field Survey. We use deep HST/WFC3 imaging to supplement ground-based observations and infer key galaxy properties. Compared to typ…
HI-H2 transition: Exploring the role of the magnetic field. A case study toward the Ursa Major cirrus
Blinov, D.; Panopoulou, G. V.; Gong, Y. +6 more
Context. Atomic gas in the diffuse interstellar medium (ISM) is organized in filamentary structures. These structures usually host cold and dense molecular clumps. The Galactic magnetic field is considered to play an important role in the formation of these clumps.
Aims: Our goal is to explore the role of the magnetic field in the HI
Light-curve Evolution of the Nearest Tidal Disruption Event: A Late-time, Radio-only Flare
Yuan, Qiang; Perlman, Eric S.; Meyer, Eileen T. +7 more
Tidal disruption events (TDEs) occur when a star passes close enough to a galaxy's supermassive black hole to be disrupted by tidal forces. We discuss new observations of IGRJ12580+0134, a TDE observed in NGC 4845 (d = 17 Mpc) in 2010 November, with the Karl G. Jansky Very Large Array (VLA 9 9 The National Radio Astronomy Obs…
Galactic Cosmic Rays Throughout the Heliosphere and in the Very Local Interstellar Medium
Heber, Bernd; Zhang, Ming; Potgieter, Marius S. +7 more
We review recent observations and modeling developments on the subject of galactic cosmic rays through the heliosphere and in the Very Local Interstellar Medium, emphasizing knowledge that has accumulated over the past decade. We begin by highlighting key measurements of cosmic-ray spectra by Voyager, PAMELA, and AMS and discuss advances in global…