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Identifying 850 δ Scuti pulsators in a narrow Gaia colour range with TESS 10-min full-frame images
Li, Yaguang; Bedding, Timothy R.; Murphy, Simon J. +7 more
We use TESS 10-min full-frame images (Sectors 27-55) to study a sample of 1708 stars within 500 pc of the Sun that lie in a narrow colour range in the centre of the δ Scuti instability strip (0.29 < GBP - GRP < 0.31). Based on the Fourier amplitude spectra, we identify 848 δ Scuti stars, as well as 47 eclipsing or conta…
Signatures of gas flows - II. Connecting the kinematics of the multiphase circumgalactic medium to galaxy rotation
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more
The multiphase circumgalactic medium (CGM) hosts critical processes that affect galaxy evolution such as accretion and outflows. We searched for evidence of these phenomena by using the EW co-rotation fraction (
At the end of cosmic noon: Short gas depletion times in unobscured quasars at z ∼ 1
Rybak, M.; McKean, J. P.; van der Werf, P. +8 more
Unobscured quasars (QSOs) are predicted to be the final stage in the evolutionary sequence from gas-rich mergers to gas-depleted, quenched galaxies. Studies of this population, however, find a high incidence of far-infrared-luminous sources-suggesting significant dust-obscured star formation-but direct observations of the cold molecular gas fuelli…
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…