Search Publications
Determining Stellar Elemental Abundances from DESI Spectra with the Data-driven Payne
Wu, Yaqian; Xiang, Maosheng; Ting, Yuan-Sen +8 more
Stellar abundances for a large number of stars provide key information for the study of Galactic formation history. Large spectroscopic surveys such as the Dark Energy Spectroscopic Instrument (DESI) and LAMOST take median-to-low-resolution (R ≲ 5000) spectra in the full optical wavelength range for millions of stars. However, the line-blending ef…
Compositions of the Hercules-Aquila Cloud and Virgo Overdensity
Shi, Jianrong; Huang, Yang; Ma, Jun +4 more
Based on a sample of K giant from Large sky Area Multi-Object fibre Spectroscopic Telescope Data Release 8 and a sample of RR Lyrae (RRL) from Gaia Data Release 3, we investigate the compositions of the Hercules-Aquila Cloud (HAC) and Virgo Overdensity (VOD) and their collective contribution to the tilt and triaxiality of the stellar halo ($r\, \l…
The tidal deformation and atmosphere of WASP-12 b from its phase curve★
Alonso, R.; Deleuil, M.; Erikson, A. +85 more
Context. Ultra-hot Jupiters present a unique opportunity to understand the physics and chemistry of planets, their atmospheres, and interiors at extreme conditions. WASP-12 b stands out as an archetype of this class of exoplanets, with a close-in orbit around its star that results in intense stellar irradiation and tidal effects.
Aims: The go…
The Magellanic Puzzle: origin of the periphery
Nidever, David L.; Massana, Pol; Olsen, Knut
In this paper, we analyse the metallicity structure of the Magellanic Clouds using parameters derived from the Gaia Data Release 3 (DR3) low-resolution XP (for Blue/Red Photometer) spectra, astrometry, and photometry. We find that the qualitative behaviour of the radial metallicity gradients in the Large Magellanic Cloud (LMC) and Small Magellanic…
Evidence for 3XMM J185246.6+003317 as a massive magnetar with a low magnetic field
Rodrigues, Claudia V.; de Lima, Rafael C. R.; Pereira, Jonas P. +10 more
3XMM J185246.6+003317 is a transient magnetar located in the vicinity of the supernova remnant Kes79. So far, observations have only set upper limits to its surface magnetic field and spindown, and there is no estimate for its mass and radius. Using ray-tracing modelling and Bayesian inference for the analysis of several light curves spanning a pe…
A JWST Medium-resolution MIRI Spectrum and Models of the Type Ia Supernova 2021aefx at +415 days
Suntzeff, N. B.; Wang, L.; Galbany, L. +39 more
We present a JWST MIRI medium-resolution spectrometer spectrum (5–27 µm) of the Type Ia supernova (SN Ia) SN 2021aefx at +415 days past B-band maximum. The spectrum, which was obtained during the iron-dominated nebular phase, has been analyzed in combination with previous JWST observations of SN 2021aefx to provide the first JWST time series…
SNAD catalogue of M-dwarf flares from the Zwicky Transient Facility
Voloshina, A. S.; Lavrukhina, A. D.; Pruzhinskaya, M. V. +12 more
Most of the stars in the Universe are M spectral class dwarfs, which are known to be the source of bright and frequent stellar flares. In this paper, we propose new approaches to discover M-dwarf flares in ground-based photometric surveys. We employ two approaches: a modification of a traditional method of parametric fit search and a machine learn…
Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
Scholz, R. -D.
Context. Hypervelocity stars (HVSs) unbound to the Galaxy can be formed with extreme stellar interactions, for example close encounters with supermassive black holes or in massive star clusters, supernova explosions in binary systems, or the stripping of dwarf galaxies. Observational evidence comes from measurements of radial velocities (RVs) of o…
Polycyclic aromatic hydrocarbon luminous galaxies in JWST CEERS data
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +9 more
It has been an unanswered question how many dusty galaxies have been undetected from the state-of-the-art observational surveys. JWST enables us to detect faint infrared (IR) galaxies that have prominent polycyclic aromatic hydrocarbon (PAH) features in the mid-IR wavelengths. PAH is a valuable tracer of star formation and dust properties in the m…
Spectroscopic Survey of Faint Planetary-nebula Nuclei. V. The EGB 6-type Central Star of Abell 57
Bond, Howard E.; Ciardullo, Robin; Zeimann, Gregory R. +3 more
During our spectroscopic survey of central stars of faint planetary nebulae (PNe), we found that the nucleus of Abell 57 exhibits strong nebular emission lines. Using synthetic narrowband images, we show that the emission arises from an unresolved compact emission knot (CEK) coinciding with the hot (90,000 K) central star. Thus Abell 57 belongs to…