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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}_…
Evidence of Non-Thermal Hydrogen in the Exosphere of Mars Resulting in Enhanced Water Loss
Bertaux, J. L.; Clarke, J. T.; Halekas, J. +9 more
Atomic H is a direct tracer of water loss at Mars. The recent discovery of annual enhancements in its escape rate near perihelion, in excess of the previously established theory, indicates that Mars has lost substantial amounts of water to space. However, these loss rates are often estimated assuming thermal properties for the exospheric H atoms a…
The connection between stellar mass, age, and quenching time-scale in massive quiescent galaxies at z ≃ 1
Cullen, F.; McLure, R. J.; Dunlop, J. S. +6 more
We present a spectrophotometric study of a mass-complete sample of quiescent galaxies at 1.0 < z < 1.3 with $\mathrm{log_{10}}(M_{\star }/\mathrm{{\rm M}_{\odot }}) \ge 10.3$ drawn from the VANDELS survey, exploring the relationship between stellar mass, age, and star-formation history. Within our sample of 114 galaxies, we derive a stellar-…
On the follow-up efforts of long-period transiting planet candidates detected with Gaia astrometry
Sozzetti, A.; Giacobbe, P.; Lattanzi, M. G. +1 more
The class of transiting cold Jupiters, orbiting at ≳0.5-1.0 au, is to-date underpopulated. Probing their atmospheric composition and physical characteristics is particularly valuable, as it allows for direct comparisons with the Solar system giant planets. We investigate some aspects of the synergy between Gaia astrometry and other ground-based an…