Search Publications
BU Canis Minoris - the most compact known flat doubly eclipsing quadruple system
Powell, Brian P.; Borkovits, Tamás; Gagliano, Robert +25 more
We have found that the 2+2 quadruple star system BU CMi is currently the most compact quadruple system known, with an extremely short outer period of only 121 d. The previous record holder was TIC 219006972 (Kostov et al.), with a period of 168 d. The quadruple nature of BU CMi was established by Volkov, Kravtsova & Chochol, but they misidenti…
Faint [C I](1-0) emission in z ∼ 3.5 radio galaxies
Andreani, P.; Wang, W.; Popping, G. +6 more
We present Atacama Large Millimeter/sub-millimeter Array neutral carbon, [${\rm C\, \small {\rm I}}$](1-0), line observations that probe molecular hydrogen gas (H2) within seven radio galaxies at z = 2.9-4.5 surrounded by extended (≳100 kpc) Ly α nebulae. We extract [${\rm C\, \small {\rm I}}$](1-0) emission from the radio-active galact…
Tests of photometry: the case of the NGC 3370 ACS field
Jang, In Sung
A critical analysis and comparison of different methods for obtaining point spread function (PSF) photometry are carried out. Deep ACS observations of NGC 3370 were reduced using four distinct approaches. These reductions explore a number of methodological differences: software packages (DAOPHOT and DOLPHOT), input images (individual and stacked f…
WASP-131 b with ESPRESSO - I. A bloated sub-Saturn on a polar orbit around a differentially rotating solar-type star
Lafarga, M.; Lendl, M.; Allart, R. +17 more
In this paper, we present observations of two high-resolution transit data sets obtained with ESPRESSO of the bloated sub-Saturn planet WASP-131 b. We have simultaneous photometric observations with NGTS and EulerCam. In addition, we utilized photometric light curves from TESS, WASP, EulerCam, and TRAPPIST of multiple transits to fit for the plane…
Photometric study of the late-time near-infrared plateau in Type Ia supernovae
Galbany, L.; Inserra, C.; Gutiérrez, C. P. +23 more
We present an in-depth study of the late-time near-infrared plateau in Type Ia supernovae (SNe Ia), which occurs between 70 and 500 d. We double the existing sample of SNe Ia observed during the late-time near-infrared plateau with new observations taken with the Hubble Space Telescope, Gemini, New Technology Telescope, the 3.5-m Calar Alto Telesc…
Revising the properties of low mass eclipsing binary stars using TESS light curves
Maxted, P. F. L.; Southworth, J.; Mancini, L. +1 more
Precise measurements of stellar parameters are required in order to develop our theoretical understanding of stellar structure. These measurements enable errors and uncertainties to be quantified in theoretical models and constrain the physical interpretation of observed phenomena, such as the inflated radii of low-mass stars.
Multiwavelength scrutiny of X-ray sources in dwarf galaxies: ULXs versus AGNs
Soria, Roberto; Greene, Jenny E.; Baldassare, Vivienne F. +10 more
Owing to their quiet evolutionary histories, nearby dwarf galaxies (stellar masses $M_\star \lesssim 3 \times 10^9 \, \mathrm{M}_\odot$) have the potential to teach us about the mechanism(s) that 'seeded' the growth of supermassive black holes, and also how the first stellar mass black holes formed and interacted with their environments. Here, we …
Searching for the warm-hot intergalactic medium using XMM-Newton high-resolution X-ray spectra
Churazov, E.; Kallman, T. R.; García, Javier A. +1 more
The problem of missing baryons in the local universe remains an open question. One proposed alternative is that at low redshifts missing baryons are in the form of the warm-hot intergalactic medium (WHIM). In order to test this idea, we present a detailed analysis of X-ray high-resolution spectra of six extragalactic sources, Mrk 421, 1ES 1028+511…
Constraining the assembly time of the stellar haloes of nearby Milky Way-mass galaxies through AGB populations
Bell, Eric F.; Holwerda, Benne W.; Monachesi, Antonela +5 more
The star formation histories (SFHs) of galactic stellar haloes offer crucial insights into the merger history of the galaxy and the effects of those mergers on their hosts. Such measurements have revealed that while the Milky Way's most important merger was 8-10 Gyr ago, M31's largest merger was more recent, within the last few Gyr. Unfortunately,…
Catching a nova X-ray/UV flash in the visible? Early spectroscopy of the very slow Nova Velorum 2022 (Gaia22alz)
Mukai, K.; Sokoloski, J. L.; Mróz, P. +22 more
We present early spectral observations of the very slow Galactic nova Gaia22alz, over its gradual rise to peak brightness that lasted 180 d. During the first 50 d, when the nova was only 3-4 mag above its normal brightness, the spectra showed narrow (FWHM ≈ 400 km s-1) emission lines of H Balmer, He I, He II, and C IV but no P Cygni abs…