Search Publications
The physical properties of local (U)LIRGs: A comparison with nearby early- and late-type galaxies
Bianchi, S.; Georgantopoulos, I.; Masoura, V. A. +6 more
Aims: In order to pinpoint the place of the (ultra-) luminous infrared galaxies ((U)LIRGs) in the local Universe, we examine the properties of a sample of 67 such nearby systems and compare them with those of 268 early- and 542 late-type, well studied, galaxies from the DustPedia database.
Methods: We made use of multi-wavelength photome…
The GAPS Programme at TNG. XXIX. No detection of reflected light from 51 Peg b using optical high-resolution spectroscopy
Scandariato, G.; Pagano, I.; Poretti, E. +44 more
Context. The analysis of exoplanetary atmospheres by means of high-resolution spectroscopy is an expanding research field which provides information on the chemical composition, thermal structure, atmospheric dynamics, and orbital velocity of exoplanets.
Aims: In this work, we aim to detect the light reflected by the exoplanet 51 Peg b by emp…
The diffuse interstellar band around 8620 Å. II. Kinematics and distance of the DIB carrier
Schultheis, M.; Recio-Blanco, A.; de Laverny, P. +4 more
Context. Diffuse interstellar bands (DIBs) are important interstellar absorption features of which the origin is still debated. With the large data sets from modern spectroscopic surveys, background stars are widely used to show how the integrated columns of DIB carriers accumulate from the Sun to great distances. To date, studies on the kinematic…
The β Pictoris b Hill sphere transit campaign. I. Photometric limits to dust and rings
Wang, L.; Lecavelier des Etangs, A.; Stee, P. +33 more
Aims: Photometric monitoring of β Pic in 1981 showed anomalous fluctuations of up to 4% over several days, consistent with foreground material transiting the stellar disk. The subsequent discovery of the gas giant planet β Pic b and the predicted transit of its Hill sphere to within a 0.1 au projected separation of the planet provided an oppo…
Radio evidence for a shock wave reflected by a coronal hole
Bemporad, A.; Frassati, F.; Giordano, S. +4 more
We report the first unambiguous observational evidence in the radio range of the reflection of a coronal shock wave at the boundary of a coronal hole. The event occurred above an active region located at the northwest limb of the Sun and was characterized by an eruptive prominence and an extreme-ultraviolet wave steepening into a shock. The EUV ob…
A stellar census in globular clusters with MUSE. A new perspective on the multiple main sequences of ω Centauri
Dreizler, S.; Latour, M.; Brinchmann, J. +3 more
Context. ω Cen is a rare example of a globular cluster where the iron abundance of the stars spans more than one order of magnitude. Many spectroscopic investigations of its red-giant and sub-giant branches have revealed multiple peaks in the iron abundance distribution. The metallicity distribution of main sequence (MS) stars is not well characte…
Broad-line region configuration of the supermassive binary black hole candidate PG1302-102 in the relativistic Doppler boosting scenario
Lu, Youjun; Ge, Junqiang; Ji, Xiang +2 more
PG1302-102 is thought to be a supermassive binary black hole (BBH) system according to the periodical variations of its optical and UV photometry, which may be interpreted as being due to the relativistic Doppler boosting of the emission mainly from the disk around the secondary black hole (BH) modulated by its orbital motion. In this paper, we in…
Globules and pillars in Cygnus X. III. Herschel and upGREAT/SOFIA far-infrared spectroscopy of the globule IRAS 20319+3958 in Cygnus X
Comerón, F.; Schneider, N.; Bontemps, S. +11 more
IRAS 20319+3958 in Cygnus X South is a rare example of a free-floating globule (mass ~240 M⊙, length ~1.5 pc) with an internal H II region created by the stellar feedback of embedded intermediate-mass stars, in particular, one Herbig Be star. In Schneider et al. 2012, (A&A, 542, L18) and Djupvik et al. 2017, (A&A, 599, A37), we …
Evolved massive stars at low-metallicity. IV. Using the 1.6 µm H-bump to identify red supergiant stars: Case study of NGC 6822
Yang, Ming; Bonanos, Alceste Z.; Gao, Jian +9 more
We present a case study in which we used a novel method to identify red supergiant (RSG) candidates in NGC 6822 based on their 1.6 µm H-bump. We collected 32 bands of photometric data for NGC 6822 ranging from the optical to the mid-infrared, derived from Gaia, PS1, LGGS, VHS, UKIRT, IRSF, HAWK-I, Spitzer, and WISE. Using the theoretical spe…
The behaviour of lithium at high metallicity in the Milky Way. Selection effects in the samples and the possible role of atomic diffusion
de Laverny, P.; Charbonnel, C.; Prantzos, N. +1 more
Aims: We revisit large spectroscopic data sets for field stars from the literature to derive the upper Li envelope in the high metallicity regime in our Galaxy.
Methods: We take advantage of Gaia EDR3 data and state-of-the-art stellar models to precisely determine the position of the sample dwarf stars in the Hertzsprung-Russell diagram.…