Search Publications
Confirmation of the presence of a CRSF in the NICER spectrum of X 1822-371
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Aims: X 1822-371 is an eclipsing binary system with a period close to 5.57 h and an orbital period derivative Ṗorb of 1.42(3) × 10−10 s s−1. The extremely high value of its Ṗorb is compatible with a super-Eddington mass transfer rate from the companion star and, consequently, an intrinsic luminosity…
Coronal and chromospheric activity of Teegarden's star
Schmitt, J. H. M. M.; Czesla, S.; Reiners, A. +11 more
Teegarden's star is a late-type M-dwarf planet host, typically showing only rather low levels of activity. In this paper we present an extensive characterisation of this activity at photospheric, chromospheric, and coronal levels. We specifically investigated TESS observations of Teegarden's star, which showed two very large flares with an estimat…
Extreme magnetic field modulus variability of the Bp star HD 57372
Ilyin, I.; Hubrig, S.; Järvinen, S. P. +2 more
Context. In chemically peculiar Ap/Bp stars with large-scale organised magnetic fields of simple centred dipole configuration, the ratio between the maximum and the minimum of the mean magnetic field modulus is on the order of 1.25. Values of two or more are observed only for very few Ap/Bp stars and are indicative of a very unusual magnetic field…
The disk of the eruptive protostar V900 Mon. A MATISSE/VLTI and MUSE/VLT perspective
Lykou, F.; Ábrahám, P.; Chen, L. +8 more
Aims: In this work, we study the silicate dust content in the disk of one of the youngest eruptive stars, V900 Mon, at the highest angular resolution, probing down to the inner 10 au of said disk, and study the historical evolution of the system, traced in part by a newly discovered emission clump.
Methods: We performed high angular reso…
Dynamical traceback age of the Octans young stellar association
Miret-Roig, N.; Bouy, H.; Barrado, D. +2 more
Context. Octans is one of the most distant (d ∼ 150 pc) young stellar associations of the solar neighbourhood, and it has not yet been sufficiently explored. Its age is still poorly constrained in the literature and requires further investigation.
Aims: We take advantage of the state-of-the-art astrometry delivered by the third data release o…
The debiased morphological transformations of galaxies since z = 3 in CANDELS
Demarco, R.; Cerulo, P.; Salvador, D. +3 more
Context. Morphological quantitative measurements and visual-like classifications are susceptible to biases arising from the expansion of the Universe. One of these biases is the effect of cosmological surface brightness dimming (CSBD): the measured surface brightness of a galaxy decays with redshift as (1 + z)−4. This effect might lead …
Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720 b, TOI-6008 b, and TOI-6086 b
Tamura, M.; Pallé, E.; Hirano, T. +53 more
One of the main goals of the NASA Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of Earth-like planets around nearby M-dwarf stars. We present the discovery and validation of three new short-period Earth-sized planets orbiting nearby M dwarfs: TOI-5720 b, TOI-6008 b, and TOI-6086 b. We combined TESS data, ground-based multic…
First detection of CF+ in the Large Magellanic Cloud
Gong, Yan; Menten, Karl M.; Jacob, Arshia M. +2 more
Context. CF+ has been established as a valuable diagnostic tool for investigating photodissociation regions (PDRs) and fluorine abundances in the Milky Way. However, its role in extragalactic environments remains largely uncharted.
Aims: Our objective is to explore the significance of CF+ in the Large Magellanic Cloud (L…
The search for DA double white dwarf binary candidates from SDSS DR14
Zhao, Gang; Li, Zhenwei; Zhao, Jingkun +4 more
Aims: Double white dwarf (DWD) binaries are one of the channels through which type Ia supernovae explosions occur. With the release of more and more sky survey data, the search for additional DWDs has become a possibility. We utilized the spectroscopic data from SDSS DR14 to search for DWD binaries based on variations in radial velocities (RV…
Flare heating of the chromosphere: Observations of flare continuum from GREGOR and IRIS
Berlicki, A.; Liu, W.; Dudík, J. +8 more
Context. On 2022 May 4, an M5.7 flare erupted in the active region NOAA 13004, which was the target of a coordinated campaign between GREGOR, IRIS, Hinode, and ground-based instruments at the Ondřejov observatory. A flare kernel located at the edge of a pore was co-observed by the IRIS slit and GREGOR HiFI+ imagers. Aims. We investigated the flare…