Search Publications
HD 7977 and its possible influence on Solar System bodies
Dybczyński, Piotr A.; Królikowska, Małgorzata; de Bruijne, Jos +5 more
Context. In the latest Gaia third data release, one can find extremely small proper motion components for the star HD 7977. This, together with the radial velocity measurement lead to the conclusion that this star passed very close to the Sun in the recent past.
Aims: Such a very close approach of a one solar mass star must have resulted in n…
High-mass star formation across the Large Magellanic Cloud. I. Chemical properties and hot molecular cores observed with ALMA at 1.2 mm
Fuller, Gary A.; Sánchez-Monge, Álvaro; Schilke, Peter +4 more
Context. The formation of massive stars passes through a so-called hot molecular core phase, where the temperature of molecular gas and dust rises to above 100 K within a size scale of approximately 0.1 pc. The hot molecular cores are rich in chemical compounds found in the gas phase, which are a great probe of ongoing star formation.
Aims: T…
New method for estimating molecular cloud distances based on Gaia, 2MASS, and the TRILEGAL galaxy model
Chen, Zhiwei; Feng, Haoran; Jiang, Zhibo +2 more
We propose a new method for estimating the distances of molecular clouds traced by CO line emission. Stars from 2MASS and Gaia EDR3 are selected as on-cloud stars when they are projected on a cloud. The background on-cloud stars have redder colors on average than the foreground stars. Instead of searching for stars projected away from the cloud, w…
Boost recall in quasi-stellar object selection from highly imbalanced photometric datasets. The reverse selection method
Grazian, Andrea; Boutsia, Konstantina; Cupani, Guido +9 more
Context. The identification of bright quasi-stellar objects (QSOs) is of fundamental importance to probe the intergalactic medium and address open questions in cosmology. Several approaches have been adopted to find such sources in the currently available photometric surveys, including machine learning methods. However, the rarity of bright QSOs a…
Multiplicity of stars with planets in the solar neighbourhood
Caballero, J. A.; Cortés-Contreras, M.; Cifuentes, C. +3 more
Aims. We intended to quantify the impact of stellar multiplicity on the presence and properties of exoplanets. Methods. We investigated all exoplanet host stars at less than 100 pc using the latest astrometric data from Gaia DR3 and advanced statistical methodologies. We complemented our search for common proper motion and parallax companions with…
Large-field CO (J = 1−0) observations toward SNR G150.3+4.5
Zhang, Shiyu; Su, Yang; Chen, Xuepeng +4 more
Aims: We aim to investigate the molecular environment of the supernova remnant (SNR) G150.3+4.5, and explore its association with ambient molecular clouds (MCs).
Methods: We present large-field CO (J = 1−0) molecular line observations toward SNR G150.3+4.5, using the 13.7 m millimeter telescope of the Purple Mountain Observatory. The obs…
Effects of coronal rain on decayless kink oscillations of coronal loops
Antolin, Patrick; Pant, Vaibhav; Shrivastav, Arpit Kumar
Decayless kink oscillations are ubiquitously observed in active region coronal loops with an almost constant amplitude for several cycles. Decayless kink oscillations of coronal loops triggered by coronal rain have been analyzed, but the impact of coronal rain formation in an already oscillating loop is unclear. As kink oscillations can help diagn…
High-precision astrometry with VVV. II. A near-infrared extension of Gaia into the Galactic plane
Minniti, D.; Anderson, J.; Bedin, L. R. +4 more
Aims: We use near-infrared, ground-based data from the VISTA Variables in the Via Lactea (VVV) survey to indirectly extend the astrometry provided by the Gaia catalog to objects in heavily extinct regions toward the Galactic bulge and plane that are beyond Gaia's reach.
Methods: We made use of state-of-the-art techniques developed for hi…
Simultaneous X-ray and optical variability of M dwarfs observed with eROSITA and TESS
Stelzer, B.; Magaudda, E.; Joseph, W. M. +1 more
Context. M-dwarf stars are the most numerous stars in the Galaxy, and are highly magnetically active. They exhibit bursts of radiation and matter, called flares and coronal mass ejections which have the potential to strongly affect the habitability of their planets.
Aims: We investigate variability through simultaneous optical and X-ray obser…
Mg II h&k spectra of an enhanced network region simulated with the MURaM-ChE code: Results using 1.5D synthesis
Solanki, S. K.; Leenaarts, J.; Cameron, R. +3 more
Context. The Mg II h&k lines are key diagnostics of the solar chromosphere. They are sensitive to the temperature, density, and nonthermal velocities in the chromosphere. The average Mg II h&k line profiles arising from previous 3D chromospheric simulations are too narrow compared to observations. Aims. We study the formation and properties of the…