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The Magnetic Sensitivity of the (250-278 nm) Fe II Polarization Spectrum
Afonso Delgado, David; del Pino Alemán, Tanausú; Trujillo Bueno, Javier
This paper presents a theoretical investigation of the polarization and magnetic sensitivity of the near-ultraviolet (near-UV) solar spectral lines of Fe II between 250 and 278 nm. In recent years, UV spectropolarimetry has become key to uncovering the magnetism of the upper layers of the solar chromosphere. The unprecedented data obtained by the …
Assessing global trends in Mars magma compositions using ground truth
Head, James W.; Rogers, A. Deanne; McSween, Harry Y. +1 more
Global magmatic trends inferred from gamma-ray, visible/near-infrared, and thermal infrared spectrometers on Mars-orbiting spacecraft have been used to constrain planetary petrogenetic processes and global thermal evolution models. Inferred magmatic trends include temporal variations in the relative proportions of low-Ca and high-Ca pyroxenes, and…
Spinning up a Daze: TESS Uncovers a Hot Jupiter Orbiting the Rapid Rotator TOI-778
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +69 more
NASA's Transiting Exoplanet Survey Satellite (TESS) mission has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating stars, facilitating the confirmation and mass determination of these worlds. We present the discovery of a hot Jupiter orbit…
A Morphological Study of Two Young Multipolar Planetary Nebulae
Hsia, Chih-Hao; Kang, Xiao-Xi; Wen, Shi-Bo +2 more
We carry out an optical morphological and infrared spectral study for two young planetary nebulae (PNs) Hen 2-158 and Pe 1-1 to understand their complex shapes and dust properties. Hubble Space Telescope optical images reveal that these nebulae have several bipolar-lobed structures and a faint arc with a clear boundary is located at the northweste…
Parámetros astrofísicos de cúmulos abiertos ubicados en el tercer y cuarto cuadrante de la Galaxia
Baracchi, M. A.; Colazo, A. D. V.; Rodríguez-Buss, C. M. +7 more
As part of new project in the framework of the activities of the subject `Astrofísica General} (FaMAF, UNC), we present astrophysical parameters of open clusters located in the third and fourth Galactic quadrant: NGC 2243, NGC 2439, Pi 12, Tr 13 and NGC 5168. Based on Gaia DR3 photometric data and fitting theoretical isochrones to the color-magnit…
The Nature of LoBAL QSOs. II. HST/WFC3 Observations Reveal Host Galaxies Dominated by Mergers
Lacy, Mark; Canalizo, Gabriela; Farrah, Duncan +4 more
Low-ionization broad absorption line QSOs (LoBALs) are suspected to be merging systems in which extreme, active galactic nucleus-driven outflows have been triggered. Whether or not LoBALs are uniquely associated with mergers, however, has yet to be established. To characterize the morphologies of LoBALs, we present the first high-resolution morpho…
TOI-2498 b: a hot bloated super-Neptune within the Neptune desert
Cegla, Heather M.; Latham, David W.; Fernández Fernández, Jorge +39 more
We present the discovery and confirmation of a transiting hot bloated super-Neptune using photometry from the Transiting Exoplanet Survey Satellite (TESS) and the Las Cumbres Observatory Global Telescope (LCOGT) and radial velocity measurements from the High Accuracy Radial velocity Planet Searcher (HARPS). The host star TOI-2498 is a V = 11.2, G-…
Relating photometric and magnetic properties of structures at solar surface
Sokoloff, Dmitry; Obridko, Vladimir; Katsova, Maria
We investigate sharp structures visible in solar magnetic field tracers. It is shown that the sunspot magnetic boundaries do not coincide with the photometric ones. Moreover, there is no clear boundary of the magnetic field in the vicinity of sunspots. Thus, the widely accepted concept of magnetic tubes with sharp edges is not always correct and s…
Fundamental parameters of two O9-type giant stars: the (former) spectral classification standard HD 93249 A and ALS 12502 A
Simón-Díaz, S.; Gamen, R.; Maíz Apellániz, J. +5 more
The evolution of massive stars is not completely understood. Several phenomena affect their birth, life, and death, multiplicity being one of them. In this context, the OWN and MONOS projects are systematically observing O- and WN-type stars whose multiplicity status is unknown. Their major goal considers the necessity of determining absolute para…
Swift Deep Galactic Plane Survey classification of Swift J170800-402551.8 as a candidate intermediate polar cataclysmic variable
Mukai, K.; Cenko, S. B.; Hailey, C. +24 more
Here, we present the results of our multiwavelength campaign aimed at classifying Swift J170800-402551.8 as part of the Swift Deep Galactic Plane Survey (DGPS). We utilized Target of Opportunity (ToO) observations with the Neil Gehrels Swift Observatory, Chandra X-ray Observatory, Neutron star Interior Composition Explorer (NICER), X-ray Multi-Mir…