Search Publications
A puzzling 2-hour X-ray periodicity in the 1.5-hour orbital period black widow PSR J1311−3430
Mereghetti, Sandro; Belfiore, Andrea; Salvaterra, Ruben +3 more
Time-domain analysis of an archival XMM-Newton observation unveiled a very unusual variability pattern in the soft X-ray emission of PSR J1311−3430, a black widow millisecond pulsar in a tight binary (PB = 93.8 min) with a very low-mass (M ∼ 0.01 M⊙) He companion star, known to show flaring emission in the optical and in the …
Differential astrometry with Gaia. Investigating relativistic light deflection close to Jupiter
Lattanzi, M. G.; Messineo, R.; Busonero, D. +5 more
Aims: In this paper, we develop a differential astrometric framework that is appropriate for a scanning space satellite such as Gaia. We apply it to the first of the GAREQ fields - the Gaia Relativistic Experiment on Jupiter's quadrupole - which is the fruit of dedicated efforts within the Gala project focused on measuring the relativistic de…
Spectral evidence of solar neighborhood analogs in CALIFA galaxies
Sánchez, S. F.; Barrera-Ballesteros, J. K.; Carigi, L. +3 more
Aims: We introduce a novel nonparametric method to find solar neighborhood analogs (SNAs) in extragalactic integral field spectroscopic surveys. The main ansatz is that the physical properties of the solar neighborhood (SN) should be encoded in its optical stellar spectrum.
Methods: We assume that our best estimate of such a spectrum is …
AGN in the ULIRG HE 0435−5304
Pollo, Agnieszka; Małek, Katarzyna; Hryniewicz, Krzysztof +2 more
Context. HE 0435−5304 from Hamburg European Southern Observatory survey is a quasar that appears in the literature with two conflicting redshift values: ∼1.2 and ∼0.4. It was used in the studies of the intergalactic medium through fitting of the narrow absorption lines in its ultraviolet (UV) spectrum. This source is also known historically as a l…
NIR jets from a clustered region of massive star formation. Morphology and composition in the IRAS 18264-1152 region
Leurini, S.; Ramsay, S.; Caratti o Garatti, A. +6 more
Context. Massive stars play crucial roles in determining the physical and chemical evolution of galaxies. However, they form deeply embedded in their parental clouds, making it challenging to directly observe these stars and their immediate environments. It is known that accretion and ejection processes are intrinsically related, thus observing th…
Radial distribution of the carbonaceous nano-grains in the protoplanetary disk around HD 169142
Di Folco, Emmanuel; Devinat, Marie; Habart, Émilie +4 more
Context. HD 169142 is part of the class of (pre-)transitional protoplanetary disks showing multiple carbon nanodust spectroscopic signatures (aromatic, aliphatic) dominating the infrared spectrum. Precise constraints on the spatial distribution and properties of carbonaceous dust particles are essential to understanding the physics, radiative tran…
Investigating datasets with high IRIS burst prevalence
Kleint, L.; Nelson, C. J.
Context. Approximately 0.01% of all Si IV 1394 Å spectra sampled in 2013 and 2014 by the Interface Region Imaging Spectrograph (IRIS) have IRIS burst profiles. However, these events are not evenly distributed across datasets with 19.31% of these spectra being identified in only six (of more than 3500) rasters.
Aims: Here, we investigate five …
Spatially resolved mid-infrared observations of the circumstellar environment of the born-again object FG Sge
Ohnaka, K.; Jara Bravo, B. A.
Context. FG Sge has evolved from the hot central star of the young planetary nebula Hen 1-5 to a G-K supergiant in the last 100 yr. It is one of the three born-again objects that have been identified as of yet, and they are considered to have undergone a thermal pulse in the post-asymptotic giant branch evolution.
Aims: We present mid-infrare…
Gaia-supported re-discovery of a remarkable weak line quasar from a variability and proper motion survey
Scholz, Ralf-Dieter; Meusinger, Helmut
We demonstrate that VPMS J170850.95+433223.7 is a weak line quasar (WLQ) which is remarkable in several respects. It was already classified as a probable quasar two decades ago, but with considerable uncertainty. The non-significant proper motion and parallax from the Gaia Early Data Release 3 have solidified this assumption. Based on previously u…
A Kepler K2 view of subdwarf A-type stars
Mösenlechner, G.; Paunzen, E.; Pelisoli, I. +3 more
Context. The spectroscopic class of subdwarf A-type (sdA) stars has come into focus in recent years because of their possible link to extremely low-mass white dwarfs, a rare class of objects resulting from binary evolution. Although most sdA stars are consistent with metal-poor halo main-sequence stars, the formation and evolution of a fraction of…