Search Publications
JWST Imaging of Edge-on Protoplanetary Disks. III. Drastic Morphological Transformation Across the Mid-infrared in Oph163131
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +6 more
We present JWST broadband images of the highly inclined protoplanetary disk SSTc2d J163131.2-242627 (Oph163131) from 2.0 to 21 µm. The images show a remarkable evolution in disk structure with wavelength, quite different from previous JWST observations of other edge-on disks. At 2.0 and 4.4 µm, Oph163131 shows two scattering surfaces s…
X-Ray Spectroscopy of the Dwarf Nova Z Chamaeleontis in Quiescence and Outburst Using the XMM-Newton Observatory
Drake, Jeremy J.; Balman, Şölen; Godon, Patrick +1 more
We present X-ray spectroscopy of the SU UMa–type dwarf nova Z Chamaeleontis using the European Photon Imaging Camera and reflection grating spectrometer (RGS) instruments on board the XMM-Newton observatory. The quiescent system can be modeled by collisional equilibrium (CIE) or nonequilibrium plasma models, yielding a kT of 8.2–13.0 keV at a lumi…
Search for Stellar Companions of Exoplanet Host Stars with AstraLux/CAHA 2.2 m
Mugrauer, Markus; Buder, Sven; Ginski, Christian +3 more
Stellar multiplicity is a key aspect of exoplanet diversity, as the presence of more than one star in a planetary system can have both devastating and positive effects on its formation and evolution. In this paper, we present the results of a Lucky Imaging survey of 212 exoplanet host stars performed with AstraLux at the 2.2 m telescope of the Cen…
Star formation history of the post-collisional Cartwheel galaxy using AstroSat/UVIT FUV images
Gómez-González, V. M. A.; Mayya, Y. D.; Barway, Sudhanshu +1 more
We present the results obtained by analysing the new AstroSat Ultra-Violet Imaging Telescope (UVIT) far-ultraviolet (FUV) image of the collisional-ring galaxy Cartwheel. The FUV emission is principally associated with the star-forming outer ring, with no ultraviolet detection from the nucleus and inner ring. A few sources are detected in the regio…
Chandra X-ray analysis of Herbig Ae/Be stars
Mathew, Blesson; Manoj, P.; Kartha, Sreeja S. +4 more
Herbig Ae/Be (HAeBe) stars are intermediate-mass pre-main-sequence stars, characterized by infrared (IR) excess and emission lines. They are observed to emit X-rays, whose origin is a matter of discussion and not settled yet. X-ray emission is not expected in HAeBe stars, as they lack the subsurface convective zone. In this study, we retrieved obs…
TV Mon - post-mass transfer Algol-type binary with δ Scuti pulsations in primary component
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +4 more
We present a study of the detached eclipsing binary TV Mon using spectra from the LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) medium-resolution survey, ASAS-SN (All Sky Automated Survey for SuperNovae), and CoRoT (Convection, Rotation and planetary Transits) photometry. We apply multiple-epochs spectral fitting to derive rad…
A Spectroscopic and Interferometric Study of W Serpentis Stars. I. Circumbinary Outflow in the Interacting Binary W Serpentis
Gies, Douglas R.; Shepard, Katherine; Monnier, John D. +6 more
W Serpentis is an eclipsing binary system and the prototype of the Serpentid class of variable stars. These are interacting binaries experiencing intense mass transfer and mass loss. However, the identities and properties of both stars in W Ser remain a mystery. Here, we present an observational analysis of high-quality, visible-band spectroscopy …
Absence of a correlation between white dwarf planetary accretion and primordial stellar metallicity
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +8 more
Over a quarter of white dwarfs have photospheric metal pollution, which is evidence for recent accretion of exoplanetary material. While a wide range of mechanisms have been proposed to account for this pollution, there are currently few observational constraints to differentiate between them. To investigate the driving mechanism, we observe a sam…
The improved component masses and parallaxes for the two close binary stars: HD80671 and HD97038
Masda, Suhail
We present the fundamental stellar parameters, including the individual component masses, as well as the orbital parameters, and dynamical parallaxes of the two close binary stars; HD80671, and HD97038. The stellar parameters are spectrophotometrically estimated via Al-Wardat's method for analyzing binary and multiple stellar systems, which is hav…
Molecular line polarisation from the circumstellar envelopes of asymptotic giant branch stars
Velilla-Prieto, L.; Vlemmings, W. H. T.; Lankhaar, B.
Context. Polarisation observations of masers in the circumstellar envelopes (CSEs) around asymptotic giant branch (AGB) stars have revealed strong magnetic fields. However, masers probe only specific lines of sight through the CSE. Non-masing molecular line polarisation observations can more directly reveal the large-scale magnetic field morpholog…