Search Publications
ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N 105 Star-forming Region
Tokuda, Kazuki; Onishi, Toshikazu; Kurtz, Stan E. +18 more
The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molecules (COMs), including biologically important ones, in low-metallicity environments-typical of earlier cosmological epochs. We report the results of 1.2 mm continuum and molecular line observations of three fields i…
Multiply eclipsing candidates from the TESS satellite
Mašek, M.; Zasche, P.; Henzl, Z.
We present a catalogue of the Transiting Exoplanet Survey Satellite (TESS) targets that show multiple eclipses. In all of these stars, we detected two sets of eclipses, for which their two distinctive periods can be derived. These multiple stellar systems could either be doubly eclipsing quadruples or triple-star coplanar systems showing eclipses …
Transient obscuration event captured in NGC 3227. II. Warm absorbers and obscuration events in archival XMM-Newton and NuSTAR observations
Kaspi, Shai; Kriss, Gerard A.; Mehdipour, Missagh +18 more
The relationship between warm absorber (WA) outflows of active galactic nuclei and nuclear obscuration activities caused by optically thick clouds (obscurers) crossing the line of sight is still unclear. NGC 3227 is a suitable target for studying the properties of both WAs and obscurers because it matches the following selection criteria: WAs in b…
Detectability of Black Hole Binaries with Gaia: Dependence on Binary Evolution Models
Shikauchi, Minori; Tanikawa, Ataru; Kawanaka, Norita
The astrometric satellite Gaia is expected to observe noninteracting black hole (BH) binaries with luminous companions (LCs; hereafter BH-LC binaries), a different population from BH X-ray binaries previously discovered. The detectability of BH-LC binaries with Gaia might be dependent on binary evolution models. We investigated the Gaia's detectab…
A WISE view on extreme AGB stars
Groenewegen, M. A. T.
Context. Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period is related to the luminosity and mass-loss rate (MLR) of the star. Long-period variables (LPVs) and Mira variables are the most prominent of all types of variability of evolved stars. However, the reddest, most obscured AGB stars are too fa…
Identification and Spectroscopic Characterization of 128 New Herbig Stars
Panić, Olja; Pérez-Martínez, Ricardo; Oudmaijer, René D. +6 more
We present optical spectroscopy observations of 145 high-mass pre-main-sequence candidates from the catalog of Vioque et al. 2020 From these, we provide evidence for the Herbig nature of 128 sources. This increases the number of known objects of the class by ~50%. We determine the stellar parameters of these sources using the spectra and Gaia EDR3…
The average dust attenuation curve at z 1.3 based on HST grism surveys
Malkan, M. A.; Calzetti, D.; Scarlata, C. +12 more
We present the first characterization of the average dust attenuation curve at z ~ 1.3 by combining rest-frame ultraviolet through near-IR photometry with Balmer decrement (H α/H β) constraints for ~900 galaxies with 8 ≲ log (M⋆/M⊙) < 10.2 at 0.75 < z < 1.5 in the HST WFC3 IR Spectroscopic Parallel and 3D-HST grism s…
A blast from the infant Universe: The very high-z GRB 210905A
Covino, S.; D'Avanzo, P.; Campana, S. +52 more
We present a detailed follow-up of the very energetic GRB 210905A at a high redshift of z = 6.312 and its luminous X-ray and optical afterglow. Following the detection by Swift and Konus-Wind, we obtained a photometric and spectroscopic follow-up in the optical and near-infrared (NIR), covering both the prompt and afterglow emission from a few min…
A new emulated Monte Carlo radiative transfer disc-wind model: X-Ray Accretion Disc-wind Emulator - XRADE
Brusa, M.; Dadina, M.; Reeves, J. N. +14 more
We present a new X-Ray Accretion Disc-wind Emulator (XRADE) based on the 2.5D Monte Carlo radiative transfer code that provides a physically motivated, self-consistent treatment of both absorption and emission from a disc wind by computing the local ionization state and velocity field within the flow. XRADE is then implemented through a process th…
Photometric characterization and trajectory accuracy of Starlink satellites: implications for ground-based astronomical surveys
Battle, Adam; Campbell, Tanner; Reddy, Vishnu +2 more
Starlink is a low-Earth orbit (LEO) satellite constellation operated by Space Exploration Technologies Corp. (SpaceX) which aims to provide global satellite internet access. Thus far, most photometric observations of Starlink satellites have primarily been from citizen scientists' visual observations without using quantitative detectors. This pape…