Search Publications
J-NEP: 60-band photometry and photometric redshifts for the James Webb Space Telescope North Ecliptic Pole Time-Domain Field
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Mendes de Oliveira, C. +28 more
The Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) will observe approximately one-third of the northern sky with a set of 56 narrow-band filters using the dedicated 2.55 m Javalambre Survey Telescope (JST) at the Javalambre Astrophysical Observatory. Prior to the installation of the main camera, in order to demonstrat…
The Gaia view of the Cepheus OB2 association
Ábrahám, Péter; Kun, Mária; Szilágyi, Máté +1 more
OB associations, birthplaces of the most luminous stars, are key objects for understanding the formation of high-mass stars and their effects on their environments. The aim of this work is to explore the structure and kinematics of the Cepheus OB2 association and characterize the history of star formation in the region - in particular, the role of…
A Search for Unbound Stellar Companions to Pulsar J1124-5916
Kochanek, C. S.
We searched for and found no higher mass (${\gtrsim}3{\rm M}_\odot$) unbound binary stellar companions to the progenitor of pulsar J1124-5916. There are lower mass candidates, but they all have high probabilities of being false positives. There are no candidates for it now being a fully unbound triple system. Even if one of the lower mass candidat…
Initiation mechanism of the first on-disk X-class flare of solar cycle 25
Feng, Xueshang; Duan, Aiying; Jiang, Chaowei +1 more
In this paper we study the initiation mechanism of the first on-disk X-class eruptive flare in solar cycle 25. Coronal magnetic field reconstructions reveal a magnetic flux rope (MFR) whose configuration is highly consistent with a filament existing for a long period before the flare; the eruption of the whole filament indicates that the MFR erupt…
Imaging of exocomets with infrared interferometry
Janson, Markus; Rebollido, Isabel; Brandeker, Alexis +6 more
Active comets have been detected in several exoplanetary systems, although so far only indirectly, when the dust or gas in the extended coma has transited in front of the stellar disk. The large optical surface and relatively high temperature of an active cometary coma also makes it suitable to study with direct imaging, but the angular separation…
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…
Shedding New Light on Weak Emission-line Quasars in the C IV-Hβ Parameter Space
Brandt, W. N.; Myers, Adam D.; Strauss, Michael A. +20 more
Weak emission-line quasars (WLQs) are a subset of type 1 quasars that exhibit extremely weak Lyα + N V λ1240 and/or C IV λ1549 emission lines. We investigate the relationship between emission-line properties and accretion rate for a sample of 230 "ordinary" type 1 quasars and 18 WLQs at z < 0.5 and 1.5 < z < 3.5 that have rest-frame ultra…
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.…
TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star
Kobulnicky, Henry A.; Cochran, William D.; Mahadevan, Suvrath +19 more
Using both ground-based transit photometry and high-precision radial velocity spectroscopy, we confirm the planetary nature of TOI-3785 b. This transiting Neptune orbits an M2-Dwarf star with a period of ~4.67 days, a planetary radius of 5.14 ± 0.16 R ⊕, a mass of ${14.95}_{-3.92}^{+4.10}$ M ⊕, and a density of $\rho ={0.61}_…