Search Publications
The PAU Survey: early demonstration of photometric redshift performance in the COSMOS field
Carretero, J.; Castander, F. J.; Crocce, M. +23 more
The Physics of the Accelerating Universe Survey (PAUS) is an innovative photometric survey with 40 narrow-bands at the William Herschel Telescope (WHT). The narrow-bands are spaced at 100 Å intervals covering the range 4500-8500 Å and, in combination with standard broad-bands, enable excellent redshift precision. This paper describes the technique…
A high binary fraction for the most massive close-in giant planets and brown dwarf desert members
Bonavita, M.; Rice, K.; Lopez, E. +3 more
Stellar multiplicity is believed to influence planetary formation and evolution, although the precise nature and extent of this role remain ambiguous. We present a study aimed at testing the role of stellar multiplicity in the formation and/or evolution of the most massive, close-in planetary and substellar companions. Using past and new direct im…
Dust traps in the protoplanetary disc MWC 758: two vortices produced by two giant planets?
Dong, Ruobing; Baruteau, Clément; Carmona, Andrés +9 more
Resolved ALMA and VLA observations indicate the existence of two dust traps in the protoplanetary disc MWC 758. By means of two-dimensional gas+dust hydrodynamical simulations post-processed with three-dimensional dust radiative transfer calculations, we show that the spirals in scattered light, the eccentric, asymmetric ring and the crescent-shap…
X-ray spectra reveal the reawakening of the repeat changing-look AGN NGC 1566
Harrison, F.; Schartel, N.; Santos-Lleó, M. +6 more
We present simultaneous XMM-Newton and NuSTAR observations of the repeat changing-look AGN NGC 1566, which dramatically increased in brightness in the IR to X-ray bands in 2018. The broad-band X-ray spectrum was taken at the peak of the outburst and is typical of Seyfert 1 AGN. The spectrum shows a soft excess, Compton hump, warm absorption and re…
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) - I. Search for exoplanets and variable stars in the field of 47 Tuc
Bedin, L. R.; Montalto, M.; Piotto, G. +9 more
The TESS mission will survey ∼85 per cent of the sky, giving us the opportunity of extracting high-precision light curves of millions of stars, including stellar cluster members. In this work, we present our project `A PSF-based Approach to TESS High quality data Of Stellar clusters' (PATHOS), aimed at searching and characterize candidate exoplane…
Chandra centres for COSMOS X-ray galaxy groups: differences in stellar properties between central dominant and offset brightest group galaxies
Daddi, Emanuele; Dolag, Klaus; Capak, Peter +24 more
We present the results of a search for galaxy clusters and groups in the ∼2 deg2 of the COSMOS field using all available X-ray observations from the XMM-Newton and Chandra observatories. We reach an X-ray flux limit of 3× 10^{-16} erg cm^{-2 s}^{-1} in the 0.5-2 keV range, and identify 247 X-ray groups with M_{ 200c}=8× 10^{12}-3× 10^{1…
Study of Lithium-rich giants with the GALAH spectroscopic survey
Deepak; Reddy, Bacham E.
In this article, we speculate on the possible mechanisms for Li enhancement origin in RGB stars based on a large data set of around 340 299 stars collected from the GALAH survey combined with the Gaia astrometry. Data has 51 982 low mass (M ≤ 2 M⊙) RGB stars with reliable atmospheric parameters. The data set shows a well-populated RGB w…
Probing the existence of very massive first stars
Salvadori, S.; Bonifacio, P.; Caffau, E. +4 more
We present a novel approach aimed at identifying the key chemical elements to search for the (missing) descendants of very massive first stars exploding as pair instability supernovae (PISN). Our simple and general method consists in a parametric study accounting for the unknowns related to early cosmic star formation and metal-enrichment. Our app…
The tidal disruption event AT2017eqx: spectroscopic evolution from hydrogen rich to poor suggests an atmosphere and outflow
Berger, E.; Challis, P.; Foley, R. J. +24 more
We present and analyse a new tidal disruption event (TDE), AT2017eqx at redshift z = 0.1089, discovered by Pan-STARRS and ATLAS. The position of the transient is consistent with the nucleus of its host galaxy; the spectrum shows a persistent blackbody temperature T ≳ 20 000 K with broad H I and He II emission; and it peaks at a blackbody luminosit…
MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4
Wade, G. A.; Neiner, C.; Paunzen, E. +7 more
Recently, high-precision optical 2-min cadence light curves obtained with TESS for targets located in the mission's defined first four sectors have been released. The majority of these high-cadence and high-precision measurements currently span {∼ }28 d, thereby allowing periodic variability occurring on time-scales {≲ }14 d to potentially be dete…