Search Publications
GALACTICNUCLEUS: A high-angular-resolution JHKs imaging survey of the Galactic centre. II. First data release of the catalogue and the most detailed CMDs of the GC
Nishiyama, S.; Najarro, F.; Nogueras-Lara, F. +7 more
Context. The high extinction and extreme source crowding of the central regions of the Milky Way are serious obstacles to the study of the structure and stellar population of the Galactic centre (GC). Existing surveys that cover the GC region (2MASS, UKIDSS, VVV, SIRIUS) do not have the necessary high angular resolution. Therefore, a high-angular-…
Tidally Induced Radius Inflation of Sub-Neptunes
Millholland, Sarah
Recent work suggests that many short-period super-Earth and sub-Neptune planets may have significant spin axis tilts (“obliquities”). When planets are locked in high-obliquity states, the tidal dissipation rate may increase by several orders of magnitude. This intensified heat deposition within the planets’ interiors should generate significant st…
The SkyMapper DR1.1 search for extremely metal-poor stars
Schmidt, B. P.; Da Costa, G. S.; Marino, A. F. +10 more
We present and discuss the results of a search for extremely metal-poor stars based on photometry from data release DR1.1 of the SkyMapper imaging survey of the southern sky. In particular, we outline our photometric selection procedures and describe the low-resolution (R ≈ 3000) spectroscopic follow-up observations that are used to provide estima…
Multiple Spiral Arms in the Disk around Intermediate-mass Binary HD 34700A
Monnier, John D.; Kraus, Stefan; Oppenheimer, Rebecca +14 more
We present the first images of the transition disk around the close binary system HD 34700A in polarized scattered light using the Gemini Planet Imager instrument on Gemini South. The J- and H-band images reveal multiple spiral-arm structures outside a large (R = 0.″49 = 175 au) cavity, along with a bluish spiral structure inside the cavity. The c…
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…
Massive star evolution: rotation, winds, and overshooting vectors in the mass-luminosity plane. I. A calibrated grid of rotating single star models
Higgins, Erin R.; Vink, Jorick S.
Context. Massive star evolution is dominated by various physical effects, including mass loss, overshooting, and rotation, but the prescriptions of their effects are poorly constrained and even affect our understanding of the main sequence.
Aims: We aim to constrain massive star evolution models using the unique test-bed eclipsing binary HD 1…
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…
No Evidence for Lunar Transit in New Analysis of Hubble Space Telescope Observations of the Kepler-1625 System
Bedell, Megan; Kreidberg, Laura; Luger, Rodrigo
Observations of the Kepler-1625 system with Kepler and the Hubble Space Telescope have suggested the presence of a candidate exomoon, Kepler-1625b I, a Neptune-radius satellite orbiting a long-period Jovian planet. Here we present a new analysis of the Hubble observations, using an independent data reduction pipeline. We find that the transit ligh…
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…