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Stellar pulsation and granulation as noise sources in exoplanet transit spectroscopy in the ARIEL space mission
Vandenbussche, Bart; Pascale, Enzo; Argyriou, Ioannis +2 more
Stellar variability from pulsations and granulation presents a source of correlated noise that can impact the accuracy and precision of multiband photometric transit observations of exoplanets. This can potentially cause biased measurements in the transmission or emission spectrum or underestimation of the final error bars on the spectrum. ARIEL i…
Parallaxes of Southern Extremely Cool objects III: 118 L and T dwarfs
Sozzetti, A.; Lattanzi, M. G.; Bucciarelli, B. +17 more
We present new results from the Parallaxes of Southern Extremely Cool dwarfs program to measure parallaxes, proper motions and multiepoch photometry of L and early T dwarfs. The observations were made on 108 nights over the course of 8 yr using the Wide Field Imager on the ESO 2.2m telescope. We present 118 new parallaxes of L and T dwarfs of whic…
Optical and near-infrared IFU spectroscopy of the nuclear region of the AGN-starburst galaxy NGC 7582
Ricci, T. V.; Steiner, J. E.; May, D. +2 more
NGC 7582 is an SB(s)ab galaxy which displays evidences of simultaneous nuclear activity and star formation in its centre. Previous optical observations revealed, besides the H II regions, an ionization cone and a gas disc in its central part. Hubble Space Telescope (HST) images in both optical and infrared bands show the active galactic nuclei (AG…
Tracing the assembly history of NGC 1395 through its Globular Cluster System
Forte, Juan C.; Faifer, Favio R.; González, Nélida M. +4 more
We used deep Gemini-South/GMOS g΄r΄i΄z΄ images to study the globular cluster (GC) system of the massive elliptical galaxy NGC 1395, located in the Eridanus supergroup. The photometric analysis of the GC candidates reveals a clear colour bimodality distribution, indicating the presence of `blue' and `red'…
A deep near-infrared spectroscopic survey of the Scutum-Crux arm for Wolf-Rayet stars
Crowther, Paul A.; Rosslowe, C. K.
We present a New Technology Telescope/Son-of-Isaac spectroscopic survey of infrared selected Wolf-Rayet (WR) candidates in the Scutum-Crux spiral arm (298° ≤ l ≤ 340°, |b| ≤ 0.5°. We obtained near-IR spectra of 127 candidates, revealing 17 WR stars - a ∼13 per cent success rate - of which 16 are newly identified here. The majority of the new WR st…
The second Herschel-ATLAS Data Release - III. Optical and near-infrared counterparts in the North Galactic Plane field
Ivison, R. J.; Ibar, E.; Dunne, L. +8 more
This paper forms part of the second major public data release of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). In this work, we describe the identification of optical and near-infrared counterparts to the submillimetre detected sources in the 177 deg2 North Galactic Plane (NGP) field. We used the likelihood ratio met…
GRAWITA: VLT Survey Telescope observations of the gravitational wave sources GW150914 and GW151226
Covino, S.; D'Avanzo, P.; Campana, S. +50 more
We report the results of deep optical follow-up surveys of the first two gravitational-wave sources, GW150914 and GW151226, done by the GRAvitational Wave Inaf TeAm Collaboration (GRAWITA). The VLT Survey Telescope (VST) responded promptly to the gravitational wave alerts sent by the LIGO and Virgo Collaborations, monitoring a region of 90 and 72 …
Discovery of WASP-174b: Doppler tomography of a near-grazing transit
Bouchy, F.; Queloz, D.; Ségransan, D. +23 more
We report the discovery and tomographic detection of WASP-174b, a planet with a near-grazing transit on a 4.23-d orbit around a V= 11.9, F6V star with [Fe/H] = 0.09 ± 0.09. The planet is in a moderately misaligned orbit with a sky-projected spin-orbit angle of λ = 31° ± 1°. This is in agreement with the known tendency for orbits around hotter star…
Hubble Tarantula Treasury Project - VI. Identification of pre-main-sequence stars using machine-learning techniques
Gouliermis, Dimitrios A.; Anderson, Jay; Grebel, Eva K. +9 more
The Hubble Tarantula Treasury Project (HTTP) has provided an unprecedented photometric coverage of the entire starburst region of 30 Doradus down to the half Solar mass limit. We use the deep stellar catalogue of HTTP to identify all the pre-main-sequence (PMS) stars of the region, i.e. stars that have not started their lives on the main-sequence …
Large-scale three-dimensional Gaussian process extinction mapping
Sale, S. E.; Magorrian, J.
Gaussian processes (GPs) are the ideal tool for modelling the Galactic interstellar medium, combining statistical flexibility with a good match to the underlying physics. In an earlier paper, we outlined how they can be employed to construct three-dimensional maps of dust extinction from stellar surveys. GPs scale poorly to large data sets though,…