Search Publications
Super-resolution of Solar Magnetograms Using Deep Learning
Xu, Long; Zhao, Dong; Dou, Fengping +2 more
Currently, data-driven models of solar activity forecast are investigated extensively by using machine learning. For model training, it is highly demanded to establish a large database which may contain observations coming from different instruments with different spatio-temporal resolutions. In this paper, we employ deep learning models for super…
Physical properties of more than one thousand brightest cluster galaxies detected in the Canada-France-Hawaii Telescope Legacy Survey
Durret, F.; Márquez, I.; Sarron, F. +1 more
Context. Brightest cluster galaxies (BCGs) are very massive elliptical galaxies found at the centres of clusters. Their study gives clues to the formation and evolution of the clusters in which they are embedded.
Aims: We analyse here in a homogeneous way the properties of a sample of more than 1000 BCGs in the redshift range 0.15 < z <…
HD 20329b: An ultra-short-period planet around a solar-type star found by TESS
Pallé, E.; Dai, F.; Gandolfi, D. +45 more
Context. Ultra-short-period (USP) planets are defined as planets with orbital periods shorter than one day. This type of planets is rare, highly irradiated, and interesting because their formation history is unknown.
Aims: We aim to obtain precise mass and radius measurements to confirm the planetary nature of a USP candidate found by the Tra…
The TESS Triple-9 Catalog: 999 uniformly vetted exoplanet candidates
Kostov, Veselin B.; Colón, Knicole D.; Christiansen, Jessie L. +20 more
The Transiting Exoplanet Survey Satellite (TESS) has detected thousands of exoplanet candidates since 2018, most of which have yet to be confirmed. A key step in the confirmation process of these candidates is ruling out false positives through vetting. Vetting also eases the burden on follow-up observations, provides input for demographics studie…
Solar Wind Charge Exchange Soft X-Ray Emissions in the Magnetosphere during an Interplanetary Coronal Mass Ejection Compared to Its Driven Sheath
Liu, Ying D.; Sun, Wei; Ji, Li +9 more
Soft X-ray emissions from solar wind charge exchange (SWCX) are applied in a recently developed approach to study the magnetosphere using panoramic soft X-ray imaging. This study represents the first attempt to distinguish magnetospheric SWCX emissions observed by XMM-Newton during the impact of an interplanetary coronal mass ejection (ICME) and i…
Fundamental effective temperature measurements for eclipsing binary stars - III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31
Alonso, R.; Deleuil, M.; Erikson, A. +74 more
EBLM J0113+31 is a moderately bright (V = 10.1), metal-poor ([Fe/H] ≈-0.3) G0V star with a much fainter M dwarf companion on a wide, eccentric orbit (= 14.3 d). We have used near-infrared spectroscopy obtained with the SPIRou spectrograph to measure the semi-amplitude of the M dwarf's spectroscopic orbit, and high-precision photometry of the eclip…
Inner southern magnetosphere observation of Mercury via SERENA ion sensors in BepiColombo mission
Kallio, E.; Barabash, S.; Holmström, M. +89 more
Mercury's southern inner magnetosphere is an unexplored region as it was not observed by earlier space missions. In October 2021, BepiColombo mission has passed through this region during its first Mercury flyby. Here, we describe the observations of SERENA ion sensors nearby and inside Mercury's magnetosphere. An intermittent high-energy signal, …
A new low-luminosity globular cluster discovered in the Milky Way with the VVVX survey
Minniti, D.; Fernández-Trincado, J. G.; Alonso-García, J. +4 more
Context. The VISTA Variables in the Via Láctea Extended Survey (VVVX) allows us to probe previously unexplored regions of the inner Milky Way (MW), especially those that are affected by stellar crowding and strong extinction.
Aims: Our long-term goal is to identify new star clusters and investigate them to reveal their true nature. In particu…
99 oscillating red-giant stars in binary systems with NASA TESS and NASA Kepler identified from the SB9-Catalogue
García, R. A.; Mathis, S.; Mathur, S. +6 more
Oscillating red-giant stars in binary systems are an ideal testbed for investigating the structure and evolution of stars in the advanced phases of evolution. With 83 known red giants in binary systems, of which only ∼40 have determined global seismic parameters and orbital parameters, the sample is small compared to the numerous known oscillating…
Stellar kinematics of dwarf galaxies from multi-epoch spectroscopy: application to Triangulum II
Caldwell, Nelson; Martin, Nicolas F.; Mateo, Mario +9 more
We present new MMT/Hectochelle spectroscopic measurements for 257 stars observed along the line of sight to the ultrafaint dwarf galaxy Triangulum II (Tri II). Combining results from previous Keck/DEIMOS spectroscopy, we obtain a sample that includes 16 likely members of Tri II, with up to 10 independent redshift measurements per star. To this mul…