Search Publications
Dynamical detection of a companion driving a spiral arm in a protoplanetary disk
Dong, Ruobing; Ren, Bin B.; Wagner, Kevin +6 more
Radio and near-infrared observations have observed dozens of protoplanetary disks that host spiral arm features. Numerical simulations have shown that companions may excite spiral density waves in protoplanetary disks via companion-disk interaction. However, the lack of direct observational evidence for spiral-driving companions poses challenges t…
Photometric determination of the mass accretion rates of pre-main-sequence stars. VII. The low-density cluster NGC 376 in the Small Magellanic Cloud
Panagia, Nino; De Marchi, Guido; Tsilia, Styliani
Aims: We study the properties of low-mass stars recently formed in the field of the NGC 376 cluster in the Small Magellanic Cloud (SMC).
Methods: Using photometric observations acquired with the Hubble Space Telescope (HST) in the V, I, and Hα bands, we identify 244 candidate pre-main-sequence (PMS) stars showing Hα excess emission at th…
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…
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…
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…