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Ultra-high-resolution observations of plasmoid-mediated magnetic reconnection in the deep solar atmosphere
de la Cruz Rodríguez, Jaime; van Noort, Michiel; Rouppe van der Voort, Luc H. M.
Context. Magnetic reconnection in the deep solar atmosphere can give rise to enhanced emission in the Balmer hydrogen lines, a phenomenon referred to as Ellerman bombs.
Aims: To effectively trace magnetic reconnection below the canopy of chromospheric fibrils, we analyzed unique spectroscopic observations of Ellerman bombs in the Hα line.
Elemental Abundances of the Super-Neptune WASP-107b's Host Star Using High-resolution, Near-infrared Spectroscopy
Souto, Diogo; Crossfield, Ian J. M.; Nordlander, Thomas +8 more
We present the first elemental abundance measurements of the K dwarf (K7V) exoplanet-host star WASP-107 using high-resolution (R ≃45,000), near-infrared (H- and K-band) spectra taken from Gemini-S/IGRINS. We use the previously determined physical parameters of the star from the literature and infer the abundances of 15 elements—C, N, O, Na, Mg, Al…
Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry
Kiefer, F.; Lagrange, A. -M.; Rubini, P. +2 more
Context. Thanks to more than 20 yr of monitoring, the radial velocity (RV) method has detected long-period companions (P > 10 yr) around several dozens of stars. Yet, the true nature of these companions remains unclear because of the uncertainty as to the inclination of the companion orbital plane.
Aims: We wish to constrain the orbital in…
The first two-dimensional stellar structure and evolution models of rotating stars. Calibration to β Cephei pulsator HD 192575
Rieutord, M.; Espinosa Lara, F.; Mombarg, J. S. G.
Contact. Rotation is a key ingredient in the theory of stellar structure and evolution. Until now, stellar evolution codes operate in a one-dimensional framework for which the validity domain in regards to the rotation rate is not well understood.
Aims: In this Letter, we present the first results of self-consistent stellar models in two spat…
An X-Ray-dim "Isolated" Neutron Star in a Binary?
Shi, Jianrong; Ramsay, Gavin; Esamdin, Ali +13 more
We report the discovery of a dark companion to 2MASS J15274848+3536572 with an orbital period of 6.14 hr. Combining the radial velocity from LAMOST observations and modeling of the multiband light curve, one obtains a mass function of ≃0.131 M ⊙, an inclination of $45\buildrel{\circ}\over{.} {20}_{-0\buildrel{\circ}\over{.} \,20}^{+0\bu…
Accurate oxygen abundance of interstellar gas in Mrk 71 from optical and infrared spectra
Weiner, Benjamin; Spilker, Justin; Fadda, Dario +9 more
The heavy element content (`metallicity') of the Universe is a record of the total star formation history. Gas-phase metallicity in galaxies, as well as its evolution with time, is of particular interest as a tracer of accretion and outflow processes. However, metallicities from the widely used electron temperature (Te) method are typic…
The Near Infrared Imager and Slitless Spectrograph for JWST. V. Kernel Phase Imaging and Data Analysis
Willott, Chris J.; Noirot, Gaël; Mérand, Antoine +26 more
Kernel phase imaging (KPI) enables the direct detection of substellar companions and circumstellar dust close to and below the classical (Rayleigh) diffraction limit. The high-Strehl full pupil images provided by the James Webb Space Telescope (JWST) are ideal for application of the KPI technique. We present a kernel phase analysis of JWST NIRISS …
No Small-scale Radio Jets Here: Multiepoch Observations of Radio Continuum Structures in NGC 1068 with the VLBA
Fischer, Travis C.; Secrest, Nathan J.; Crenshaw, D. Michael +2 more
We present recent Very Long Baseline Array (VLBA) 5 GHz radio observations of the nearby, luminous Seyfert 2 galaxy NGC 1068 for comparison to similar VLBA observations made on 1997 April 26. By cross-correlating the positions of emitting regions across both epochs, we find that spatially resolved extranuclear radio knots in this system have subre…
Sodium Brightening of (3200) Phaethon near Perihelion
Zhang, Qicheng; Knight, Matthew M.; Battams, Karl +2 more
Sunskirting asteroid (3200) Phaethon has been repeatedly observed in Solar Terrestrial Relations Observatory (STEREO) Heliospheric Imager 1 (HI1) imagery to anomalously brighten and produce an antisunward tail for a few days near each perihelion passage, phenomena previously attributed to the ejection of micron-sized dust grains. Color imaging by …
Analysing the SEDs of protoplanetary disks with machine learning
Pinte, C.; Woitke, P.; Kamp, I. +2 more
Context. The analysis of spectral energy distributions (SEDs) of protoplanetary disks to determine their physical properties is known to be highly degenerate. Hence, a full Bayesian analysis is required to obtain parameter uncertainties and degeneracies. The main challenge here is computational speed, as one proper full radiative transfer model re…