Explanipedia

Mapping Cassiopeia A’s silicon/sulfur Doppler velocities with XRISM/Resolve Open

Jacco Vink, Manan Agarwal, Aya Bamba, Liyi Gu, Paul P. Plucinsky , et al. · 2025

Young supernova remnants (SNRs) provide crucial insights into explosive nucleosynthesis products and their velocity distribution soon after the explosion. However, these velocities are influenced by the dynamics of the circumstellar medium…

Measuring the asymmetric expansion of the Fe ejecta of Cassiopeia A with XRISM/Resolve Open

Aya Bamba, Manan Agarwal, Jacco Vink, Paul P. Plucinsky, Y. Terada , et al. · 2025

The expansion structure of supernova remnants is important for understanding not only how heavy elements are distributed into space, but also how supernovae explode. The ejecta expansion structure of the young core-collapse supernova remna…

Evidence for charge exchange emission in supernova remnant N 132D from XRISM/Resolve observations Open

Liyi Gu, Hiroya Yamaguchi, Adam Foster, Satoru Katsuda, Hiroyuki Uchida , et al. · 2025

XRISM has delivered one of its first light observations on N 132D, the X-ray brightest supernova remnant in the Large Magellanic Cloud. Utilizing 193 ks of high-resolution X-ray spectroscopy data, we conduct a comprehensive search for char…

Mapping Cassiopeia A's silicon/sulfur Doppler velocities with XRISM-Resolve Open

Jacco Vink, Manan Agarwal, Aya Bamba, Liyi Gu, Paul P. Plucinsky , et al. · 2025

Young supernova remnants (SNRs) provide crucial insights into explosive nucleosynthesis products and their velocity distribution soon after the explosion. However, these velocities are influenced by the dynamics of the circumstellar medium…

Dynamics of the intermediate-mass-element ejecta in the supernova remnant Cassiopeia A studied with XRISM Open

Shunsuke Suzuki, Hidetaka Sonoda, Yusuke Sakai, Yuken Ohshiro, S. Yamada , et al. · 2025

Supernova remnants (SNRs) provide crucial information on the still poorly understood mechanism of supernova explosion. Here we present XRISM high-resolution spectroscopy of the intermediate-mass-element (IME) ejecta in the SNR Cas A to det…

Measuring the asymmetric expansion of the Fe ejecta of Cassiopeia A with XRISM/Resolve Open

Aya Bamba, Manan Agarwal, Jacco Vink, Paul P. Plucinsky, Y. Terada , et al. · 2025

The expansion structure of supernova remnants (SNRs) is important for understanding not only how heavy elements are distributed into space, but also how supernovae explode. The ejecta expansion structure of the young core-collapse SNR Cas …

Dynamical Evolution of Four Old Galactic Open Clusters Traced by Their Constituent Stars with Gaia DR3 Open

Shanmugha Balan, Khushboo K Rao, Kaushar Vaidya, Manan Agarwal, Souradeep Bhattacharya · 2024

We investigate the evolutionary stages of four open clusters—Berkeley 39, Collinder 261, NGC 6819, and NGC 7789—of ages ranging from 1.6 to 6 Gyr. These clusters have previously been classified into dynamically young and intermediate age g…

Dynamical Evolution of Four Old Galactic Open Clusters traced by their constituent stars with \textit{Gaia} DR3 Open

Shanmugha Balan, Khushboo K Rao, Kaushar Vaidya, Manan Agarwal, Souradeep Bhattacharya · 2024

We investigate the evolutionary stages of four open clusters, Berkeley 39, Collinder 261, NGC 6819, and NGC 7789, of ages ranging from 1.6 -- 6 Gyr. These clusters have previously been classified into dynamically young and intermediate age…

X-Ray Diagnostics of Cassiopeia A’s “Green Monster”: Evidence for Dense Shocked Circumstellar Plasma Open

Jacco Vink, Manan Agarwal, Patrick Slane, Ilse De Looze, D. Milisavljević , et al. · 2024

The recent survey of the core-collapse supernova remnant Cassiopeia A (Cas A) with the MIRI instrument on board the James Webb Space Telescope (JWST) revealed a large structure in the interior region, referred to as the “Green Monster.” Al…

X-ray diagnostics of Cassiopeia A's "Green Monster": evidence for dense shocked circumstellar plasma Open

Jacco Vink, Manan Agarwal, Patrick Slane, Ilse De Looze, D. Milisavljević , et al. · 2024

The recent survey of the core-collapse supernova remnant Cassiopeia A (CasA) with the MIRI instrument on board the James Webb Space Telescope (JWST) revealed a large structure in the interior region, referred to as the "Green Monster". Alt…

UOCS-XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat Open

Anju Panthi, Kaushar Vaidya, Nagaraj Vernekar, Annapurni Subramaniam, Vikrant V. Jadhav , et al. · 2023

We present a study of blue straggler stars (BSSs) of open cluster NGC 7142 using AstroSat/UVIT data and other archival data. Using a machine learning-based algorithm, ML-MOC, on Gaia DR3 data, we find 546 sources as cluster members. Based …

UOCS – XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat Open

Anju Panthi, Kaushar Vaidya, Nagaraj Vernekar, Annapurni Subramaniam, Vikrant V. Jadhav , et al. · 2023

We present a study of blue straggler stars (BSSs) of open cluster NGC 7142 using AstroSat/UVIT data and other archival data. Using a machine-learning-based algorithm, ML-MOC, on Gaia DR3 data, we find 546 sources as cluster members. Based …

Four Years of Type Ia Supernovae Observed by TESS: Early-time Light-curve Shapes and Constraints on Companion Interaction Models Open

Michael Fausnaugh, P. Vallely, M. A. Tucker, C. S. Kochanek, B. J. Shappee , et al. · 2023

We present 307 type Ia supernova (SN) light curves from the first 4 yr of the Transiting Exoplanet Survey Satellite mission. We use this sample to characterize the shapes of the early-time light curves, measure the rise times from first li…

Determination of dynamical ages of open clusters through the A$^+$ parameter -- II Open

Khushboo K Rao, Kaushar Vaidya, Manan Agarwal, Shanmugha Balan, Souradeep Bhattacharya · 2023

Blue straggler stars (BSS), one of the most massive members of star clusters, have been used for over a decade to investigate mass segregation and estimate the dynamical ages of globular clusters (GCs) and open clusters (OCs). This work is…

Four years of Type Ia Supernovae Observed by TESS: Early Time Light Curve Shapes and Constraints on Companion Interaction Models Open

Michael Fausnaugh, P. Vallely, M. A. Tucker, C. S. Kochanek, B. J. Shappee , et al. · 2023

We present 307 Type Ia supernova (SN) light curves from the first four years of the TESS mission. We use this sample to characterize the shapes of the early time light curves, measure the rise times from first light to peak, and search for…

Applications of Deep Learning to physics workflows Open

Manan Agarwal, Jay Alameda, Jeroen Audenaert, Will Benoit, Damon Beveridge , et al. · 2023

Modern large-scale physics experiments create datasets with sizes and streaming rates that can exceed those from industry leaders such as Google Cloud and Netflix. Fully processing these datasets requires both sufficient compute power and …

A $Gaia$ EDR3 search for tidal tails in disintegrating open clusters Open

Souradeep Bhattacharya, Khushboo K Rao, Manan Agarwal, Shanmugha Balan, Kaushar Vaidya · 2022

We carry out a search for tidal tails in a sample of open clusters with known relatively elongated morphology. We identify the member stars of these clusters from the precise astrometric and deep photometric data from $Gaia$ Early Data Rel…

UOCS –VIII. UV study of the open cluster NGC 2506 using ASTROSAT★ Open

Anju Panthi, Kaushar Vaidya, Vikrant V. Jadhav, Khushboo K Rao, Annapurni Subramaniam , et al. · 2022

We study an intermediate-age open cluster (OC) NGC 2506 using the ASTROSAT/UVIT data and other archival data. We identified 2175 cluster members using a machine learning-based algorithm, ML–MOC, on Gaia EDR3 data. Among the cluster members…

Characterization of hot populations of Melotte 66 open cluster using Swift/UVOT Open

Khushboo K Rao, Kaushar Vaidya, Manan Agarwal, Anju Panthi, Vikrant V. Jadhav , et al. · 2022

Ultraviolet (UV) wavelength observations have made a significant contribution to our understanding of hot stellar populations of star clusters. Multiwavelength spectral energy distributions (SEDs) of stars, including ultraviolet observatio…

UOCS – VII. Blue straggler populations of open cluster NGC 7789 with UVIT/AstroSat Open

Kaushar Vaidya, Anju Panthi, Manan Agarwal, S. B. Pandey, Khushboo K Rao , et al. · 2022

NGC 7789 is a ∼1.6 Gyr old, populous open cluster located at ∼2000 pc. We characterize the blue straggler stars (BSS) of this cluster using the Ultraviolet (UV) data from the UVIT/AstroSat. We present spectral energy distributions (SED) of…

Determination of dynamical ages of open clusters through the A+ parameter – I Open

Khushboo K Rao, Kaushar Vaidya, Manan Agarwal, Souradeep Bhattacharya · 2021

The sedimentation level of blue straggler stars (BSS) has been shown to be a great tool to investigate the dynamical states of globular clusters (GCs). The area enclosed between the cumulative radial distributions of BSS and a reference po…

Tidal tails in the disintegrating open cluster NGC 752 Open

Souradeep Bhattacharya, Manan Agarwal, Khushboo K Rao, Kaushar Vaidya · 2021

We utilize the robust membership determination algorithm, ML-MOC, on the precise astrometric and deep photometric data from Gaia Early Data Release 3 within a region of radius 5° around the centre of the intermediate-age Galactic open clus…

Determination of dynamical ages of open clusters through the A$^+$ parameter -- I Open

Khushboo K Rao, Kaushar Vaidya, Manan Agarwal, Souradeep Bhattacharya · 2021

The sedimentation level of blue straggler stars (BSS) has been shown to be a great tool to investigate the dynamical states of globular clusters (GCs). The area enclosed between the cumulative radial distributions of BSS and a reference po…

Determination of A$^+$ in Open Clusters Open

Khushboo K Rao, Kaushar Vaidya, Manan Agarwal, Souradeep Bhattacharya · 2021

The sedimentation level of blue straggler stars (BSS) has been shown to be a great tool to investigate the dynamical states of globular clusters (GCs). The area enclosed between the cumulative radial distributions of BSS and a reference po…

ML-MOC: Machine Learning (kNN and GMM) based Membership determination for Open Clusters Open

Manan Agarwal, Khushboo K Rao, Kaushar Vaidya, Souradeep Bhattacharya · 2021

The existing open-cluster membership determination algorithms are either prior dependent on some known parameters of clusters or are not automatable to large samples of clusters. In this paper, we present ml-moc, a new machine-learning-bas…

ML-MOC: Machine Learning based Membership Determination for Open Clusters Open

Manan Agarwal, Khushboo K Rao, Kaushar Vaidya, Souradeep Bhattacharya · 2020

The existing open cluster membership determination algorithms are either prior dependent on some known parameters of clusters or are not automatable to large samples of clusters. In this paper, we present, ML-MOC, a new machine learning ba…

Blue straggler populations of seven open clusters with Gaia DR2 Open

Kaushar Vaidya, Khushboo K Rao, Manan Agarwal, Souradeep Bhattacharya · 2020

Blue straggler stars (BSS) are well studied in globular clusters but their systematic study with secure membership determination is lacking in open clusters. We use Gaia DR2 data to determine accurate stellar membership for four intermedia…

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