Search Publications
The reason for the widespread energetic storm particle event of 13 March 2023
Palmerio, E.; Jebaraj, I. C.; Riihonen, E. +20 more
Context. On 13 March 2023, when the Parker Solar Probe spacecraft (S/C) was situated on the far side of the Sun as seen from Earth, a large solar eruption took place, which created a strong solar energetic particle (SEP) event observed by multiple S/C all around the Sun. The energetic event was observed at six well-separated locations in the helio…
Search for hot subdwarf stars from SDSS images using a deep learning method: SwinBayesNet
Yi, Zhenping; Lei, Zhenxin; Kong, Xiaoming +5 more
Hot subdwarfs are essential for understanding the structure and evolution of low-mass stars, binary systems, astroseismology, and atmospheric diffusion processes. In recent years, deep learning has driven significant progress in hot subdwarf searches. However, most approaches tend to focus on modelling with spectral data, which are inherently more…
Molecular inventory of the environment of a young eruptive star: Case study of the classical FU Orionis star V1057 Cyg
Menten, K. M.; Ábrahám, P.; Kóspál, Á. +6 more
Context. Studying accretion-driven episodic outbursts in young stellar objects (YSOs) is crucial for understanding the later stages of star and planet formation. FU Orionis-type objects (briefly, FUors) represent a small but rather central class of YSOs, whose outbursts are characterized by a rapid multi-magnitude increase in brightness at optical…
Extragalactic magnetar giant flare GRB 231115A: Insights from Fermi/GBM observations
Goldstein, Adam; Kouveliotou, Chryssa; Younes, George +22 more
Magnetar giant flares (MGFs) are the extremely short, energetic transients originating from highly magnetized neutron stars. When observed in nearby galaxies, these rare events are nearly indistinguishable from cosmological short gamma-ray bursts. We present the analysis of GRB 231115A, a candidate extragalactic MGF observed by Fermi/GBM and local…
25 years of XMM-Newton observations of the Sgr A complex: 3D distribution and internal structure of the clouds
Haardt, Francesco; Ponti, Gabriele; Stel, Giovanni +1 more
Context. Sgr A⋆, the supermassive black hole at the center of the Milky Way, is currently very faint. However, X-ray radiation reflected by the Sgr A complex, a group of nearby molecular clouds, suggests that it went through one or more periods of high activity some hundreds of years ago. Aims. We aim to determine whether previously pro…
New insights into the proton precipitation sites in solar flares
Krucker, Säm; Battaglia, Andrea Francesco
Aims. We revisit the Reuven Ramaty High Energy Solar Spectrocopy Imager (RHESSI) γ-ray observations of the extraordinary GOES X25 flare SOL2003-10-28T11:10 to investigate previously reported conclusions that flare-accelerated electrons and protons precipitate along spatially separated flare loops. Methods. In contrast to previous works that recons…
ALMA detections of circumstellar disks in the giant H II region M17: Probing the intermediate- to high-mass pre-main-sequence population
Rab, C.; Kaper, L.; Hogerheijde, M. +8 more
Context. Our current understanding is that intermediate- to high-mass stars form in a way similar to low-mass stars, through disk accretion. The expected shorter formation timescales, higher accretion rates, and increasingly strong radiation fields compared to their lower-mass counterparts may lead to significantly different physical conditions th…
Gaia vbroad: Spectral-line broadening and binarity
Mazeh, T.; Faigler, S.; Brown, A. G. A. +1 more
The Gaia DR3 catalogue includes line-broadening measurements (vbroad) for 3 524 677 stars. We concentrate here on the low-mass main-sequence (MS) sub-sample of the catalogue, with (GBP ‑ GRP)0 in the range of 1–1.6, which includes 81 371 sources. The colour-magnitude diagram of the sample displays two distinct stri…
TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS, and SOPHIE
Ikuta, Kai; Bieryla, Allyson; Latham, David W. +44 more
We report the discovery and characterization of two sub-Saturns from the Transiting Exoplanet Survey Satellite (TESS) using high- resolution spectroscopic observations from the MaHPS spectrograph at the Wendelstein Observatory and the SOPHIE spectrograph at the Haute-Provence Observatory. Combining photometry from TESS, KeplerCam, LCOGT, and MuSCA…
Disentangling stellar atmospheric parameters in astronomical spectra using generative adversarial neural networks: Application to Gaia/RVS parameterisation
Álvarez, M. A.; Dafonte, C.; Manteiga, M. +4 more
Context. The rapid expansion of large-scale spectroscopic surveys has highlighted the need to use automatic methods to extract information about the properties of stars with the greatest efficiency and accuracy, and also to optimise the use of computational resources. Aims. We developed a method based on generative adversarial networks (GANs) to d…