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Characterising the high-mass star forming filament G351.776-0.527 with Herschel and APEX dust continuum and gas observations
König, C.; Menten, K. M.; Testi, L. +13 more
G351.776-0.527 is among the most massive, closest, and youngest filaments in the inner Galactic plane and therefore it is an ideal laboratory to study the kinematics of dense gas and mass replenishment on a large scale. In this paper, we present far-infrared and submillimetre wavelength continuum observations combined with spectroscopic C18
Solar microflares: a case study on temperatures and the Fe XVIII emission
Del Zanna, G.; Mitra-Kraev, U.
In this paper, we discuss the temperature distribution and evolution of a microflare, simultaneously observed by Hinode's X-Ray Telescope (XRT), its Extreme Ultraviolet Imaging Spectrometer (EIS), as well as the Atmospheric Imaging Assembly (AIA) on-board the Solar Dynamics Observatory (SDO). Using EIS lines, we find that during peak emission the …
Kepler Object of Interest Network. III. Kepler-82f: a new non-transiting 21 M⊕ planet from photodynamical modelling
Mallonn, M.; Becker, A. C.; Ribas, I. +13 more
Context. The Kepler Object of Interest Network (KOINet) is a multi-site network of telescopes around the globe organised for follow-up observations of transiting planet candidate Kepler objects of interest with large transit timing variations (TTVs). The main goal of KOINet is the completion of their TTV curves as the Kepler telescope stopped obse…
LQAC-5: The fifth release of the Large Quasar Astrometric Catalogue. A compilation of 592 809 objects with 398 697 Gaia counterparts
Barache, C.; Souami, D.; Souchay, J. +6 more
Context. In addition to their great astrophysical interest, quasars represent quasi-ideal reference objects in the celestial sphere with, a priori, a lack of significant proper motion. Since the fourth release of the Large Quasar Astrometric Catalogue (LQAC-4), a large number of quasars have been discovered, in particular those coming from the DR1…
So close, so different: characterization of the K2-36 planetary system with HARPS-N
Vanderburg, A.; Poretti, E.; Sozzetti, A. +19 more
Context. K2-36 is a K dwarf orbited by two small (Rb = 1.43 ± 0.08 R⊕ and Rc = 3.2 ± 0.3 R⊕), close-in (ab = 0.022 au and ac = 0.054 au) transiting planets discovered by the Kepler/K2 space observatory. They are representatives of two distinct families of small planets (Rp
Searching for intergalactic star forming regions in Stephan's Quintet with SITELLE. I. Ionised gas structures and kinematics
Kehrig, C.; Iglesias-Páramo, J.; Drissen, L. +3 more
Stephan's Quintet (SQ), the prototypical compact group of galaxies in the local Universe, has been observed with the imaging Fourier transform spectrometer SITELLE, attached to the Canada-France-Hawaii-Telescope, to perform a deep search for intergalactic star-forming emission. In this paper we present the extended ionised gaseous structures detec…
Fingerprinting the effects of hyperfine structure on CH and OH far infrared spectra using Wiener filter deconvolution
Lee, Min-Young; Menten, Karl M.; Jacob, Arshia M. +3 more
Context. Despite being a commonly observed feature, the modification of the velocity structure in spectral line profiles by hyperfine structure complicates the interpretation of spectroscopic data. This is particularly true for observations of simple molecules such as CH and OH toward the inner Galaxy, which show a great deal of velocity crowding.…
Accurate effective temperature from Hα profiles
Pasquini, L.; Ludwig, H. -G.; Porto de Mello, G. F. +4 more
Context. The determination of stellar effective temperature (Teff) in F, G, and K stars using Hα profile fitting is a quite remarkable and powerful tool because it does not depend on reddening and is only slightly sensitive to other atmospheric parameters. Nevertheless, this technique is not frequently used because of the complex proced…
Flying far and fast: the distribution of distant hypervelocity star candidates from Gaia DR2 data
de la Fuente Marcos, R.; de la Fuente Marcos, C.
Context. Hypervelocity stars move fast enough to leave the gravitational field of their home galaxies and venture into intergalactic space. The most extreme examples known have estimated speeds in excess of 1000 km s-1. These can be easily induced at the centres of galaxies via close encounters between binary stars and supermassive blac…
Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
Ginski, C.; Benisty, M.; de Boer, J. +10 more
Context. Protoplanetary disks are the birth environments of planetary systems. Therefore, the study of young, circumstellar environments is essential in understanding the processes taking place in planet formation and the evolution of planetary systems.
Aims: We detect and characterize circumstellar disks and potential companions around solar…