Search Publications
The stellar content of the XMM-Newton slew survey
Schmitt, J. H. M. M.; Robrade, J.; Schneider, P. C. +1 more
Aims: We present a detailed analysis of the stellar content of the current version of the XMM-Newton slew survey (XMMSL2).
Methods: Since stars emit only a small fraction of their total luminosity in the X-ray band, the stellar XMMSL2 sources ought to have relatively bright optical counterparts. Therefore the stellar identifications were…
TESS in the Solar System
Pál, András; Molnár, László; Kiss, Csaba
The Transiting Exoplanet Survey Satellite (TESS), launched successfully on 2018 April 18 will observe nearly the full sky, and will provide timeseries imaging data in ∼27-day-long campaigns. TESS is equipped with four cameras, each of which has a field of view of 24 × 24°. During the first two years of the primary mission, one of these cameras, Ca…
Can a Bright and Energetic X-Ray Pulsar Be Hiding Amid the Debris of SN 1987A?
Esposito, Paolo; Rea, Nanda; Matsuura, Mikako +3 more
The mass of the stellar precursor of supernova (SN) 1987A and the burst of neutrinos observed at the moment of the explosion are consistent with the core-collapse formation of a neutron star. However, no compelling evidence for the presence of a compact object of any kind in SN 1987A has been found yet in any band of the electromagnetic spectrum, …
Disc instabilities and nova eruptions in symbiotic systems: RS Ophiuchi and Z Andromedae
Hameury, J. -M.; Lasota, J. -P.; Bollimpalli, D. A.
Using the disc instability model for dwarf novae and soft X-ray transients, we investigate the stability of accretion discs in long-period binary systems. We simulate outbursts resulting from this thermal-viscous instability for two symbiotic systems, RS Ophiuchi and Z Andromedae. The outburst properties deduced from our simulations suggest that, …
Searching for Hα emitting sources around MWC 758. SPHERE/ZIMPOL high-contrast imaging
de Gregorio-Monsalvo, I.; Quanz, S. P.; Montesinos, B. +14 more
Context. MWC 758 is a young star surrounded by a transitional disk. The disk shows an inner cavity and spiral arms that could be caused by the presence of protoplanets. Recently, a protoplanet candidate has been detected around MWC 758 through high-resolution L'-band observations. The candidate is located inside the disk cavity at a separation of …
The 26.3-h orbit and multiwavelength properties of the `redback' millisecond pulsar PSR J1306-40
Linares, Manuel
We present the discovery of the variable optical and X-ray counterparts to the radio millisecond pulsar (MSP) PSR J1306-40, recently discovered by Keane et al. We find that both the optical and X-ray fluxes are modulated with the same period, which allows us to measure for the first time the orbital period Porb = 1.097 16[6] d. The opti…
The cosmic epoch dependence of environmental effects on size evolution of red-sequence early-type galaxies
Andreon, S.
This work aims to observationally investigate the history of size growth of early-type galaxies and how the growth depends on cosmic epoch and the mass of the halo in which they are embedded. We carried out a photometric and structural analysis in the rest-frame V band of a mass-selected (log M/M⊙ > 10.7) sample of red-sequence early…
Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters
Adam, R.; Arnaud, M.; Benoît, A. +48 more
Substructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. I…
Constraints on Cosmic-ray Acceleration Efficiency in Balmer Shocks of Two Young Type Ia Supernova Remnants in the Large Magellanic Cloud
Hughes, John P.; Pandya, Viraj; McCully, Curtis +2 more
We present results from an optical study of two young Balmer-dominated remnants of SNIa in the Large Magellanic Cloud, 0509-67.5 and 0519-69.0, in an attempt to search for signatures of efficient cosmic-ray (CR) acceleration. We combine proper motion measurements with corresponding optical spectroscopic measurements of the Hα line at multiple rim …
First detection of bromine and antimony in hot stars
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
Bromine (Z = 35) and antimony (Z = 51) are extremely difficult to detect in stars. In very few instances, weak and mostly uncertain identifications of Br I, Br II, and Sb II in relatively cool, chemically peculiar stars were successful. Adopted solar abundance values rely on meteoritic determinations. Here, we announce the first identification of …