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View article: Re-evaluating Lyman α wing opacities and the low mass-problem in cool white dwarfs
Re-evaluating Lyman α wing opacities and the low mass-problem in cool white dwarfs Open
Gaia observations have reignited interest in the optical and ultraviolet (UV) opacity problems of cool white dwarfs ($\rm{T_{\mathrm{eff}}}\le 6000$ K), which were thought to be resolved nearly two decades ago through the inclusion of Lyma…
View article: Precise Parameters for Two LISA Sources
Precise Parameters for Two LISA Sources Open
We present precise parameters for two compact double white dwarf (DWD) binaries, SDSS J232230.20+050942.0 (J2322+0509) and SDSS J063449.92+380352.2 (J0634+3803), with orbital periods of 20 and 26.5 minutes, respectively. These systems will…
View article: Discovery of an icy and nitrogen-rich extrasolar planetesimal
Discovery of an icy and nitrogen-rich extrasolar planetesimal Open
White dwarfs accreting planetary debris provide detailed insight into the bulk composition of rocky exoplanetesimals. However, only one Kuiper Belt analogue has been identified in that way so far. Here, we report the accretion of an icy ex…
View article: A hot white dwarf merger remnant revealed by an ultraviolet detection of carbon
A hot white dwarf merger remnant revealed by an ultraviolet detection of carbon Open
Atmospheric carbon has been detected in the optical spectra of six hydrogen-rich ultra-massive white dwarfs, revealing large carbon abundances (log(C/H) > −0.5) attributable to the convective dredge-up of internal carbon into thin hydrogen…
View article: Measurements of three exo-planetesimal compositions: a planetary core, a chondritic body, and an icy Kuiper belt analogue
Measurements of three exo-planetesimal compositions: a planetary core, a chondritic body, and an icy Kuiper belt analogue Open
The study of planetesimal debris accreted by white dwarfs offers unique insights into the composition of exoplanets. Using far-ultraviolet and optical spectroscopy, we have analysed the composition of planetesimals accreted by three metal …
View article: Measurements of three exo-planetesimal compositions: a planetary core, a chondritic body, and an icy Kuiper belt analogue
Measurements of three exo-planetesimal compositions: a planetary core, a chondritic body, and an icy Kuiper belt analogue Open
The study of planetesimal debris accreted by white dwarfs offers unique insights into the composition of exoplanets. Using far-ultraviolet and optical spectroscopy, we have analysed the composition of planetesimals accreted by three metal …
View article: Recent advances in conventional and innovative extraction techniques for recovery of high-added value compounds for food additives and nutraceuticals
Recent advances in conventional and innovative extraction techniques for recovery of high-added value compounds for food additives and nutraceuticals Open
There is a growing interest in the extraction of high-value compounds in food processing and industrial applications due to a need to enhance the quality, nutritional aspect, and appeal of the final product. This review critically examines…
View article: Constraints on Remnant Planetary Systems as a Function of Main-sequence Mass with HST/COS
Constraints on Remnant Planetary Systems as a Function of Main-sequence Mass with HST/COS Open
As the descendants of stars with masses less than 8 M ⊙ on the main sequence, white dwarfs provide a unique way to constrain planetary occurrence around intermediate-mass stars (spectral types BAF) that are otherwise difficult to measure w…
View article: Ultraviolet extinction correlation with 3D dust maps using white dwarfs
Ultraviolet extinction correlation with 3D dust maps using white dwarfs Open
Accurate astrometric and photometric measurements from Gaia have led to the construction of 3D dust extinction maps which can now be used for estimating the integrated extinctions of Galactic sources located within 5 kpc. These maps based …
View article: Ultraviolet extinction correlation with 3D dust maps using white dwarfs
Ultraviolet extinction correlation with 3D dust maps using white dwarfs Open
Accurate astrometric and photometric measurements from Gaia have led to the construction of 3D dust extinction maps which can now be used for estimating the integrated extinctions of Galactic sources located within 5 kpc. These maps based …
View article: Constraints on Remnant Planetary Systems as a Function of Main-Sequence Mass with HST/COS
Constraints on Remnant Planetary Systems as a Function of Main-Sequence Mass with HST/COS Open
As the descendants of stars with masses less than 8 M$_{\odot}$ on the main sequence, white dwarfs provide a unique way to constrain planetary occurrence around intermediate-mass stars (spectral types BAF) that are otherwise difficult to m…
View article: A network of cooler white dwarfs as infrared standards for flux calibration
A network of cooler white dwarfs as infrared standards for flux calibration Open
The accurate flux calibration of observational data is vital for astrophysics and cosmology because absolute flux uncertainties of stellar standards propagate into scientific results. With the ever higher precision achieved by telescopic m…
View article: The Gaia white dwarf revolution
The Gaia white dwarf revolution Open
This review highlights the role of the Gaia space mission in transforming white dwarf research. These stellar remnants constitute 5%–7% of the local stellar population in volume, yet before Gaia the lack of trigonometric parallaxes hindere…
View article: The Gaia white dwarf revolution
The Gaia white dwarf revolution Open
This review highlights the role of the Gaia space mission in transforming white dwarf research. These stellar remnants constitute 5-7% of the local stellar population in volume, yet before Gaia the lack of trigonometric parallaxes hindered…
View article: Study of Blue Metal-poor Stars Using UVIT/AstroSat
Study of Blue Metal-poor Stars Using UVIT/AstroSat Open
Blue metal-poor stars are main-sequence stars that are bluer and brighter than typical turn-off stars in metal-poor globular clusters. They are thought to have either evolved through post-mass transfer mechanisms as field blue straggler st…
View article: Unveiling the white dwarf in J191213.72 − 441045.1 through ultraviolet observations
Unveiling the white dwarf in J191213.72 − 441045.1 through ultraviolet observations Open
J191213.72 − 441045.1 is a binary system composed of a white dwarf and an M-dwarf in a 4.03-h orbit. It shows emission in radio, optical, and X-ray, all modulated at the white dwarf spin period of 5.3 min, as well as various orbital sideba…
View article: An <i>HST</i> COS ultraviolet spectroscopic survey of 311 DA white dwarfs – I. Fundamental parameters and comparative studies
An <i>HST</i> COS ultraviolet spectroscopic survey of 311 DA white dwarfs – I. Fundamental parameters and comparative studies Open
White dwarf studies carry significant implications across multiple fields of astrophysics, including exoplanets, supernova explosions, and cosmological investigations. Thus, accurate determinations of their fundamental parameters (Teff and…
View article: An HST COS ultra-violet spectroscopic survey of 311 DA white dwarfs.I. Fundamental parameters and comparative studies
An HST COS ultra-violet spectroscopic survey of 311 DA white dwarfs.I. Fundamental parameters and comparative studies Open
White dwarf studies carry significant implications across multiple fields of astrophysics, including exoplanets, supernova explosions, and cosmological investigations. Thus, accurate determinations of their fundamental parameters (Teff and…
View article: Study of blue metal-poor stars using UVIT/AstroSat
Study of blue metal-poor stars using UVIT/AstroSat Open
Blue metal-poor stars are main-sequence stars that are bluer and brighter than typical turn-off stars in metal-poor globular clusters. They are thought to have either evolved through post-mass transfer mechanisms as field blue straggler st…
View article: Globular Cluster UVIT Legacy Survey (GlobULeS) – II. Evolutionary status of hot stars in M3 and M13
Globular Cluster UVIT Legacy Survey (GlobULeS) – II. Evolutionary status of hot stars in M3 and M13 Open
We present a far-ultraviolet (FUV) study of hot stellar populations in the second parameter pair globular clusters (GCs) M3 and M13, as a part of the GC UVIT Legacy Survey programme (GlobULeS). We use observations made with F148W and F169M…
View article: Globular Cluster UVIT Legacy Survey (GlobULeS) $-$ II. Evolutionary status of hot stars in M3 and M13
Globular Cluster UVIT Legacy Survey (GlobULeS) $-$ II. Evolutionary status of hot stars in M3 and M13 Open
We present a far-ultraviolet (FUV) study of hot stellar populations in the second parameter pair globular clusters (GCs) M3 and M13, as a part of the Globular cluster UVIT Legacy Survey program (GlobULeS). We use observations made with F14…
View article: GlobULeS. IV. UVIT/AstroSat Detection of Extremely Low Mass White Dwarf Companions to Blue Straggler Stars in NGC 362
GlobULeS. IV. UVIT/AstroSat Detection of Extremely Low Mass White Dwarf Companions to Blue Straggler Stars in NGC 362 Open
We report the discovery of extremely low mass white dwarfs (ELM WDs) as a companion of blue straggler stars (BSSs) in the Galactic globular cluster NGC 362 using images from AstroSat's Ultra Violet Imaging Telescope (UVIT). Spectral energy…
View article: GlobULeS-IV. UVIT/AstroSat detection of extremely low mass white dwarf companions to blue straggler stars in NGC 362
GlobULeS-IV. UVIT/AstroSat detection of extremely low mass white dwarf companions to blue straggler stars in NGC 362 Open
We report the discovery of extremely low-mass white dwarfs (ELM WDs) as a companion of blue straggler stars (BSSs) in the Galactic globular cluster NGC 362 using images from AstroSats Ultra Violet Imaging Telescope (UVIT). Spectral Energy …
View article: Globular Cluster UVIT Legacy Survey (GlobULeS). III. Omega Centauri in Far-ultraviolet
Globular Cluster UVIT Legacy Survey (GlobULeS). III. Omega Centauri in Far-ultraviolet Open
We present the first comprehensive study of the most massive globular cluster, Omega Centauri, in the far-ultraviolet (FUV), extending from the center to ∼28% of the tidal radius using the Ultraviolet Imaging Telescope on board AstroSat. A…
View article: Globular Cluster UVIT legacy Survey (GlobUleS) III. Omega Centauri in Far-Ultraviolet
Globular Cluster UVIT legacy Survey (GlobUleS) III. Omega Centauri in Far-Ultraviolet Open
We present the first comprehensive study of the most massive globular cluster Omega Centauri in the far-ultraviolet (FUV) extending from the center to ~ 28% of the tidal radius using the Ultraviolet Imaging Telescope aboard AstroSat. A com…
View article: Globular Clusters UVIT Legacy Survey (GlobULeS) I. FUV-optical Color-Magnitude Diagrams for Eight Globular Clusters
Globular Clusters UVIT Legacy Survey (GlobULeS) I. FUV-optical Color-Magnitude Diagrams for Eight Globular Clusters Open
We present the first results of eight Globular Clusters (GCs) from the AstroSat/UVIT Legacy Survey program GlobULeS based on the observations carried out in two FUV filters (F148W and F169M). The FUV-optical and FUV-FUV color-magnitude dia…
View article: AstroSat Study of the Globular Cluster NGC 2298: Probable Evolutionary Scenarios of Hot Horizontal Branch Stars
AstroSat Study of the Globular Cluster NGC 2298: Probable Evolutionary Scenarios of Hot Horizontal Branch Stars Open
We present the far-UV (FUV) photometry of images acquired with UVIT on AstroSat to probe the horizontal branch (HB) population of the Galactic globular cluster NGC 2298. UV-optical color–magnitude diagrams (CMDs) are constructed for member…
View article: AstroSat study of the globular cluster NGC 2298: probable evolutionary scenarios of hot HB stars
AstroSat study of the globular cluster NGC 2298: probable evolutionary scenarios of hot HB stars Open
We present the far-UV (FUV) photometry of images acquired with UVIT on AstroSat to probe the horizontal branch (HB) population of the Galactic globular cluster NGC 2298. UV-optical color-magnitude diagrams (CMDs) are constructed for member…