Search Publications
First detection of oscillations in the Halo giant HD 122563: Validation of seismic scaling relations and new parameters
Andersen, M. F.; Grundahl, F.; Pallé, P. L. +8 more
Aims: The nearby metal-poor giant HD 122563 is an important astrophysical laboratory in which to test stellar atmospheric and interior physics. It is also a benchmark star for which to calibrate methods to apply to large scale surveys. Recently it has been remeasured using various methodologies given the new high precision instruments at our …
The Close AGN Reference Survey (CARS). Discovery of a global [C II] 158 µm line excess in AGN HE 1353-1917
Gaspari, M.; Groves, B.; Combes, F. +15 more
The [C II]λ158 µm line is one of the strongest far-infrared (FIR) lines and an important coolant in the interstellar medium of galaxies that is accessible out to high redshifts. The excitation of [C II] is complex and can best be studied in detail at low redshifts. Here we report the discovery of the highest global [C II] excess with respect…
Discovery of a second pulsating intermediate helium-enriched sdOB star
Latour, M.; Green, E. M.; Fontaine, G.
We present the discovery of long-period, low-amplitude, g-mode pulsations in the intermediate He-rich hot subdwarf (sdOB) star Feige 46. So far, only one other He-enriched sdOB star (LS IV-14 ° 116) was known to exhibit such pulsations. From our ground-based light curves of Feige 46, we extracted five independent periodicities ranging from 2294 s …
Masses of the Hyades white dwarfs. A gravitational redshift measurement
Pasquini, L.; Pala, A. F.; Ludwig, H. -G. +3 more
Context. It is possible to accurately measure the masses of the white dwarfs (WDs) in the Hyades cluster using gravitational redshift, because the radial velocity of the stars can be obtained independently of spectroscopy from astrometry and the cluster has a low velocity dispersion.
Aims: We aim to obtain an accurate measurement of the Hyade…
Physical conditions in the gas phases of the giant H II region LMC-N 11. II. Origin of [C II] and fraction of CO-dark gas
Lebouteiller, V.; Madden, S. C.; Galliano, F. +11 more
Context. The ambiguous origin of the [C II] 158µm line in the interstellar medium complicates its use for diagnostics concerning the star-formation rate and physical conditions in photodissociation regions.
Aims: We investigate the origin of [C II] in order to measure the total molecular gas content, the fraction of CO-dark H2
Properties of the singing comet waves in the 67P/Churyumov-Gerasimenko plasma environment as observed by the Rosetta mission
Eriksson, A.; Karlsson, T.; Volwerk, M. +9 more
Using in situ measurements from different instruments on board the Rosetta spacecraft, we investigate the properties of the newly discovered low-frequency oscillations, known as singing comet waves, that sometimes dominate the close plasma environment of comet 67P/Churyumov-Gerasimenko. These waves are thought to be generated by a modified ion-Wei…
Complex molecular gas kinematics in the inner 5 kpc of 4C12.50 as seen by ALMA
Combes, F.; Salomé, P.; Dasyra, K. M. +2 more
The nearby system 4C12.50, also known as IRAS 13451+1217 and PKS 1345+12, is a merger of gas-rich galaxies with infrared and radio activity. It has a perturbed interstellar medium (ISM) and a dense configuration of gas and dust around the nucleus. The radio emission at small (∼100 pc) and large (∼100 kpc) scales, as well as the large X-ray cavity …
A new study towards PSR J1826-1334 and PSR J1826-1256 in the region of HESS J1825-137 and HESS J1826-130
Giacani, E.; Duvidovich, L.; Castelletti, G. +2 more
Aims: The goal of this paper is to detect synchrotron emission from the relic electrons of the crushed pulsar wind nebula (PWN) HESS J1825-137 and to investigate the origin of the γ-ray emission from HESS J1826-130.
Methods: The study of HESS J1825-137 was carried out on the basis of new radio observations centred at the position of PSR …
Secondary eclipse of the hot Jupiter WASP-121b at 2 µm
Kovács, Géza; Kovács, Tamás
Ground-based observations of the secondary eclipse in the 2MASS K band are presented for the hot Jupiter WASP-121b. These are the first occultation observations of an extrasolar planet that were carried out with an instrument attached to a 1 m class telescope (the SMARTS 1.3 m). We find a highly significant eclipse depth of (0.228 ± 0.023)%. Toget…
MASCARA-3b. A hot Jupiter transiting a bright F7 star in an aligned orbit
Snellen, I. A. G.; Grundahl, F.; Hjorth, M. +12 more
We report the discovery of MASCARA-3b, a hot Jupiter orbiting its bright (V = 8.33) late F-type host every 5.55149 ± 0.00001 days in an almost circular orbit (e = 0.050-0.017+0.020). This is the fourth exoplanet discovered with the Multi-site All-Sky CAmeRA (MASCARA), and the first of these that orbits a late-type star. Follo…