Search Publications
Properties of a hypothetical cold pulsar wind in LS 5039
Bosch-Ramon, V.
Context. LS 5039 is a powerful high-mass gamma-ray binary that probably hosts a young non-accreting pulsar. However, despite the wealth of data available, the means by which the non-thermal emitter is powered are still unknown.
Aims: We use a dynamical-radiative numerical model, and multiwavelength data, to constrain the properties of a hypot…
INTEGRAL discovery of a high-energy tail in the microquasar Cygnus X-3
Rodriguez, J.; Wilms, J.; Laurent, P. +3 more
Context. The X-ray spectra of X-ray binaries are dominated by emission of either soft or hard X-rays which defines their soft and hard spectral states. While the generic picture is relatively well understood, little is known about the interplay of the various media at work, or about the reasons why some sources do not follow common behavior. Cygnu…
The aftermath of nova Centauri 2013 (V1369 Centauri)
Howell, Steve B.; Shore, Steven N.; Kuin, Paul +3 more
Context. Classical nova progenitors are cataclysmic variables and very old novae are observed to match systems with high mass transfer rates and (relatively) long orbital periods. However, the aftermath of a classical nova has never been studied in detail.
Aims: We intend to probe the aftermath of a classical nova explosion in cataclysmic var…
Fast outflows in protoplanetary nebulae and young planetary nebulae observed by Herschel/HIFI
Teyssier, D.; García-Lario, P.; Alcolea, J. +4 more
Context. Fast outflows and their interaction with slow shells (generally known as the fossil circumstellar envelope of asymptotic giant branch stars) play an important role in the structure and kinematics of protoplanetary and planetary nebulae (pPNe, PNe). To properly study their effects within these objects, we also need to observe the intermedi…
Deep transfer learning for the classification of variable sources
Bailer-Jones, Coryn A. L.; Kim, Dae-Won; Yeo, Doyeob +1 more
Ongoing or upcoming surveys such as Gaia, ZTF, or LSST will observe the light curves of billions or more astronomical sources. This presents new challenges for identifying interesting and important types of variability. Collecting a sufficient amount of labeled data for training is difficult, especially in the early stages of a new survey. Here we…
Strong Hα emission in the young planetary mass companion 2MASS J0249-0557 c
Béjar, V. J. S.; Zapatero Osorio, M. R.; Lodieu, N. +2 more
Aims: Our objective is the optical and near-infrared spectroscopic characterisation of 2MASS J0249-0557 c, a recently discovered young planetary mass companion to the β Pictoris (~25 Myr) member 2MASS J0249-0557.
Methods: Using the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey and the Two Micron All Sky Survey (2M…
VVV survey near-infrared colour catalogue of known variable stars
Minniti, D.; Saito, R. K.; Catelan, M. +4 more
Context. The Vista Variables in the Via Lactea (VVV) near-infrared variability survey explores some of the most complex regions of the Milky Way bulge and disk in terms of high extinction and high crowding.
Aims: We add a new wavelength dimension to the optical information available at the American Association of Variable Star Observers Inter…
Signatures of UV radiation in low-mass protostars. I. Origin of HCN and CN emission in the Serpens Main region
Harsono, Daniel; Karska, Agata; Tychoniec, Łukasz +6 more
Context. Ultraviolet radiation (UV) influences the physics and chemistry of star-forming regions, but its properties and significance in the immediate surroundings of low-mass protostars are still poorly understood.
Aims: Our aim is to extend the use of the CN/HCN ratio, already established for high-mass protostars, to the low-mass regime to …
Evolution of galaxy scaling relations in clusters at 0.5 < z < 1.5
Böhm, A.; Dannerbauer, H.; Hoyos, C. +4 more
Aims: We present new gas kinematic observations with the OSIRIS instrument at the GTC for galaxies in the Cl1604 cluster system at z ∼ 0.9. These observations together with a collection of other cluster samples at different epochs analyzed by our group are used to study the evolution of the Tully-Fisher, velocity-size, and specific angular mo…
Carbon-chain molecule survey toward four low-mass molecular outflow sources
Li, Di; Qin, S. -L.; Esimbek, Jarken +4 more
We performed a carbon-chain molecule (CCM) survey toward four low-mass outflow sources, IRAS 04181+2655 (I04181), HH211, L1524, and L1598, using the 13.7 m telescope at the Purple Mountain Observatory (PMO) and the 65 m Tian Ma Radio telescope at the Shanghai Observatory. We observed the following hydrocarbons (C2H, C4H, c-C<…