Search Publications
Toward a better understanding of the mid-infrared emission in the Large Magellanic Cloud
Ristorcelli, I.; Noriega-Crespo, A.; Demyk, K. +2 more
Context. The scarcity of spectroscopic data with a high signal-to-noise ratio in the interstellar medium between 20 and 100 µm has led to the development of several dust models with distinct dust properties that are poorly constrained in this broad wavelength range. Some of them require the presence of graphites, whereas others consider smal…
Searching for compact objects in the single-lined spectroscopic binaries of the young Galactic cluster NGC 6231
de Mink, S. E.; Shenar, T.; Sana, H. +7 more
Context. Recent evolutionary computations predict that a few percent of massive O or early-B stars in binary systems should have a dormant stellar-mass black hole (BH) as a companion. However, despite several reported candidate X-ray quiet OB+BH systems over the last couple of years, finding them with certainty remains challenging. Yet these have …
The CARMENES search for exoplanets around M dwarfs. A deep transfer learning method to determine Teff and [M/H] of target stars
Amado, P. J.; Caballero, J. A.; Reiners, A. +17 more
The large amounts of astrophysical data being provided by existing and future instrumentation require efficient and fast analysis tools. Transfer learning is a new technique promising higher accuracy in the derived data products, with information from one domain being transferred to improve the accuracy of a neural network model in another domain.…
The distance to the Serpens South cluster from H2O masers
Gong, Yan; Pillai, Thushara; Loinard, Laurent +3 more
In this Letter we report Very Long Baseline Array observations of 22 GHz water masers toward the protostar
Capturing the lowest luminosity state of the supergiant fast X-ray transient XTE J1739−302
Ponti, G.; Sidoli, L.; Esposito, P. +1 more
Here, we report the results of our analysis of recent Chandra, XMM-Newton, and NuSTAR observations of the supergiant fast X-ray transient XTE J1739−302. The source was caught in a low X-ray luminosity state, from a few 1031-1034 erg s−1 (0.5-10 keV). A very low X-ray luminosity was captured during an XMM-Newton obs…
Modeling the Mg I from the NUV to MIR. II. Testing stellar models
Peralta, J. I.; Vieytes, M. C.; Mendez, A. M. P. +1 more
Context. Reliable atomic data are mandatory ingredients to obtain a realistic semiempirical model of any stellar atmosphere. Due to their importance, we further improved our recently published Mg I atomic model.
Aims: We tested the new atomic model using atmospheric models of stars of different spectral types: the Sun (dG2), HD 22049 (dK2, Ep…
Long-term optical variability of the Be/X-ray binary GRO J2058+42
Blinov, D.; Reig, P.; Tzouvanou, A. +1 more
Context. GRO J2058+42 is a transient hard X-ray pulsar that occasionally goes into outburst. The optical counterpart is a poorly studied OB-type companion.
Aims: We investigate the long-term optical variability of the Be/X-ray binary GRO J2058+42 and the possible connection with periods of enhanced X-ray activity.
Methods: We performed a…
Two sub-Neptunes around the M dwarf TOI-1470
Tamura, M.; Amado, P. J.; Caballero, J. A. +50 more
Aims: A transiting planet candidate with a sub-Neptune radius orbiting the nearby (d = 51.9 ± 0.07 pc) M1.5 V star TOI-1470 with a period of ~2.5 d was announced by the NASA Transiting Exoplanet Survey Satellite (TESS), which observed the field of TOI-1470 in four different sectors. We aim to validate its planetary nature using precise radial…
Cluster aggregates surrounding Pismis 5 in the Vela molecular ridge
Hu, Qingshun; Zhang, Yu; Ma, Shuo +5 more
Context. In the Gaia era, the precision of astrometric data is unprecedented. High-quality data make it easier to find more cluster aggregates and gather further confirmation of these open clusters.
Aims: We use Gaia Data Release 3 (DR3) to redetermine the open clusters surrounding Pismis 5 in the Vela molecular ridge (VMR). We also investiga…
Very late-time spectroscopy of SN 2009ip: Constraints on the ongoing Hα emission
Prieto, Jose L.; Dessart, Luc; Pessi, Thallis
Context. The peculiar supernova (SN) 2009ip was an ambiguous event that placed many questions on its true origin. Here, we present very late-time spectroscopic and photometric observations of SN 2009ip, obtained 9 years (3274 days) after the 2012B outburst.
Aims: We analyze the Hα emission still present in the very late-time spectrum of SN 20…