Search Publications
Observational chemical signatures of the past FU Ori outbursts
Ábrahám, Péter; Kóspál, Ágnes; Smirnov-Pinchukov, Grigorii V. +4 more
FU Ori-type stars (FUors) are young stellar objects (YSOs) experiencing luminosity outbursts by a few orders of magnitude, which last for ~102 yr. A dozen of FUors are known up to date, but many more currently quiescent YSOs could have experienced such outbursts in the last ~103 yr. To find observational signatures of possibl…
Minute-cadence observations of the LAMOST Fields with the TMTS - V. Machine learning classification of TMTS catalogues of periodic variable stars
Wang, Xiaofeng; Li, Tanda; Mo, Jun +17 more
Periodic variables are always of great scientific interest in astrophysics. Thanks to the rapid advancement of modern large-scale time-domain surveys, the number of reported variable stars has experienced substantial growth for several decades, which significantly deepened our comprehension of stellar structure and binary evolution. The Tsinghua U…
Triaxial Schwarzschild models of NGC 708: a 10-billion solar mass black hole in a low-dispersion galaxy with a Kroupa IMF
Bender, Ralf; Thomas, Jens; Saglia, Roberto P. +3 more
We report the discovery of a (1.0 ± 0.28) × 1010 M⊙ supermassive black hole (BH) at the centre of NGC 708, the Brightest Cluster Galaxy of Abell 262. Such high BH masses are very rare and allow to investigate BH-host galaxy scaling relations at the high mass end, which in turn provide hints about the (co)evolution of such sys…
The spatially resolved star formation history of the dwarf spiral galaxy NGC 5474
Östlin, G.; Cignoni, M.; Tosi, M. +16 more
We study the resolved stellar populations and derive the star formation history of NGC 5474, a peculiar star-forming dwarf galaxy at a distance of ~7 Mpc, using Hubble Space Telescope Advanced Camera for Surveys data from the Legacy Extragalactic UV Survey (LEGUS) programme. We apply an improved colour-magnitude diagram fitting technique based on …
Revealing H2O dissociation in WASP-76 b through combined high- and low-resolution transmission spectroscopy
Madhusudhan, Nikku; Gandhi, Siddharth; Brogi, Matteo +3 more
Numerous chemical constraints have been possible for exoplanetary atmospheres thanks to high-resolution spectroscopy (HRS) from ground-based facilities as well as low-resolution spectroscopy (LRS) from space. These two techniques have complementary strengths, and hence combined HRS and LRS analyses have the potential for more accurate abundance co…
Physical properties of Centaur (60558) 174P/Echeclus from stellar occultations
Maury, A.; Gillon, M.; Jehin, E. +42 more
The Centaur (60558) Echeclus was discovered on 2000 March 03, orbiting between the orbits of Jupiter and Uranus. After exhibiting frequent outbursts, it also received a comet designation, 174P. If the ejected material can be a source of debris to form additional structures, studying the surroundings of an active body like Echeclus can provide clue…
Probing coherence in metal absorption towards multiple images of strong gravitationally lensed quasars
Fumagalli, Michele; Acebron, Ana; Grillo, Claudio +3 more
We present a tomographic analysis of metal absorption lines arising from the circumgalactic medium (CGM) of galaxies at z ≈ 0.5-2, using Multi Unit Spectroscopic Explorer (MUSE) observations of two background quasars at z ≈ 2.2 and 2.8, which are two of the few currently known quasars with multiple images due to strong gravitational lensing by gal…
The S-PLUS Transient Extension Program: imaging pipeline, transient identification, and survey optimization for multimessenger astronomy
Mendes de Oliveira, C.; Alvarez-Candal, A.; Kilpatrick, C. D. +9 more
We present the S-PLUS Transient Extension Program (STEP): a supernova and fast transient survey conducted in the southern hemisphere using data from the Southern Photometric Local Universe Survey (S-PLUS) Main Survey and the T80-South telescope. Transient astrophysical phenomena have a range of interest that goes through different fields of astrop…
Characterization of Herschel-selected strong lens candidates through HST and sub-mm/mm observations
Berta, S.; Pérez-Fournon, I.; Rodighiero, G. +36 more
We have carried out Hubble Space Telescope (HST) snapshot observations at 1.1 µm of 281 candidate strongly lensed galaxies identified in the wide-area extragalactic surveys conducted with the Herschel Space Observatory. Our candidates comprise systems with flux densities at $500\, \mu$m, S500 ≥ 80 mJy. We model and subtract the su…
Spectroscopic analysis of the strongly lensed SN Encore: constraints on cosmic evolution of Type Ia supernovae
Pérez-Fournon, I.; Koekemoer, Anton M.; Poidevin, F. +16 more
Strong gravitational lensing magnifies the light from a background source, allowing us to study these sources in detail. Here, we study the spectra of a