D. K. Ojha
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View article: Unraveling the Feedback-regulated Star Formation Activities around the Expanding Galactic Mid-infrared Bubble [HKS2019] E71
Unraveling the Feedback-regulated Star Formation Activities around the Expanding Galactic Mid-infrared Bubble [HKS2019] E71 Open
We explore the physical environment of the Galactic mid-infrared (MIR) bubble [HKS2019] E71 (hereafter E71) through a multiwavelength approach. E71 is located at the edge of a filamentary structure, as traced in Herschel images (250–500 μ …
View article: Long-term investigation of an open cluster Berkeley 65
Long-term investigation of an open cluster Berkeley 65 Open
We present a decade-long investigation of a poorly studied cluster, Berkeley 65 (Be 65), using deep optical data from the telescopes of ARIES, Nainital Observatory. We estimate its radius ( = 1.6′, aspect ratio of 1.1), distance (2.0 0.…
View article: Magnetic fields in the massive star-forming region NGC 6334 and their relationship with the properties of dust filaments probed by [C <scp>ii</scp>] and PAH emissions
Magnetic fields in the massive star-forming region NGC 6334 and their relationship with the properties of dust filaments probed by [C <span>ii</span>] and PAH emissions Open
We carried out the near-infrared ($JHK_{\rm s}$) imaging polarimetric observation with the polarimeter SIRPOL on the Infrared Survey Facility (IRSF) 1.4 m telescope and [C ii] line mapping observation with a Fabry–Pérot spectrometer on boa…
View article: Magnetic fields in the massive star-forming region NGC 6334 and their relationship with the properties of dust filaments probed by [CII] and PAH emissions
Magnetic fields in the massive star-forming region NGC 6334 and their relationship with the properties of dust filaments probed by [CII] and PAH emissions Open
We carried out the near-infrared ($JHK_{\rm s}$) imaging polarimetric observation with the polarimeter SIRPOL on the Infrared Survey Facility (IRSF) 1.4 m telescope and [CII] line mapping observation with a Fabry-Pérot spectrometer on boar…
View article: Star formation efficiency and scaling relations in parsec-scale cluster-forming clumps
Star formation efficiency and scaling relations in parsec-scale cluster-forming clumps Open
Numerical simulations predict that clumps ($\sim$1 pc) should form stars at high efficiency to produce bound star clusters. We conducted a statistical study of 17 nearby cluster-forming clumps to examine the star formation rate and gas mas…
View article: Star formation efficiency and scaling relations in parsec-scale cluster-forming clumps
Star formation efficiency and scaling relations in parsec-scale cluster-forming clumps Open
Numerical simulations predict that clumps ($\sim$1 pc) should form stars at high efficiency to produce bound star clusters. We conducted a statistical study of 17 nearby cluster-forming clumps to examine the star formation rate and gas mas…
View article: Searching for GEMS: TOI-5688 A b, a Low-density Giant Orbiting a High-metallicity Early M-dwarf*
Searching for GEMS: TOI-5688 A b, a Low-density Giant Orbiting a High-metallicity Early M-dwarf* Open
We present the discovery of a low-density planet orbiting the high-metallicity early M-dwarf TOI-5688 A b. This planet was characterized as part of the search for transiting giant planets ( R ≳ 8 R ⊕ ) through the Searching for Giant Exopl…
View article: Evidence for the gravity-driven and magnetically-regularized gas flows feeding the massive protostellar cluster in Cep A
Evidence for the gravity-driven and magnetically-regularized gas flows feeding the massive protostellar cluster in Cep A Open
The hierarchical interplay among gravity, magnetic fields, and turbulent gas flows in delivering the necessary material to form massive protostellar clusters remains enigmatic. We have performed high-resolution (beam size $\sim$14 arcsec $…
View article: Study of the high-mass star-forming region S255IR at various scales
Study of the high-mass star-forming region S255IR at various scales Open
The core of S255IR-SMA1 contains the protostar NIRS3 with a mass of about 20 $M_{\odot}$. A few years ago, the first burst of luminosity for massive protostars, caused by an episodic accretion event, was recorded here. We have been studyin…
View article: Research on the interstellar medium and star formation in the Galaxy: An Indian perspective
Research on the interstellar medium and star formation in the Galaxy: An Indian perspective Open
View article: Twins in diversity: understanding circumstellar disc evolution in the twin clusters of W5 complex
Twins in diversity: understanding circumstellar disc evolution in the twin clusters of W5 complex Open
Young star-forming regions in massive environments are ideal test beds to study the influence of surroundings on the evolution of discs around low-mass stars. We explore two distant young clusters, IC 1848-East and West located in the mass…
View article: Twins in Diversity: Understanding circumstellar disk evolution in the twin clusters of W5 complex
Twins in Diversity: Understanding circumstellar disk evolution in the twin clusters of W5 complex Open
Young star-forming regions in massive environments are ideal test beds to study the influence of surroundings on the evolution of disks around low-mass stars. We explore two distant young clusters, IC 1848-East and West located in the mass…
View article: Searching for GEMS: TOI-5688 A b, a low-density giant orbiting a high-metallicity early M-dwarf
Searching for GEMS: TOI-5688 A b, a low-density giant orbiting a high-metallicity early M-dwarf Open
We present the discovery of a low-density planet orbiting the high-metallicity early M-dwarf TOI-5688 A b. This planet was characterized as part of the search for transiting giant planets ($R \gtrsim8$ M${}_\oplus$) through the Searching f…
View article: Peering into the Heart of the Giant Molecular Cloud G148.24+00.41: A Deep Near-infrared View of the Newly Hatched Cluster FSR 655
Peering into the Heart of the Giant Molecular Cloud G148.24+00.41: A Deep Near-infrared View of the Newly Hatched Cluster FSR 655 Open
We present a detailed near-infrared study of an embedded cluster located in the hub of the giant molecular cloud G148.24+00.41 of mass ∼10 5 M ⊙ , with the TANSPEC instrument mounted on the 3.6 m Devasthal Optical Telescope. The hub is loc…
View article: Peering into the Heart of the Giant Molecular Cloud G148.24+00.41: A Deep Near-infrared View of the Newly Hatched Cluster FSR 655
Peering into the Heart of the Giant Molecular Cloud G148.24+00.41: A Deep Near-infrared View of the Newly Hatched Cluster FSR 655 Open
We present a detailed near-infrared study of an embedded cluster located in the hub of the giant molecular cloud G148.24+00.41 of mass $\sim$10$^5$ $M_\odot$, with the TANSPEC instrument mounted on the 3.6 m Devasthal Optical Telescope. Th…
View article: Study of the high-mass star-forming region S255IR at various scales
Study of the high-mass star-forming region S255IR at various scales Open
The S255IR-SMA1 core contains the protostar NIRS3 with a mass of $\sim$20 M$_\odot$. Several years ago, the first burst of luminosity for massive protostars, caused by an episodic accretion event, was recorded here. We have been studying t…
View article: Investigating the Star-forming Sites in the Outer Galactic Arm
Investigating the Star-forming Sites in the Outer Galactic Arm Open
We aim to investigate the global star formation scenario in star-forming sites AFGL 5157, [FSR2007] 0807 (hereafter FSR0807), [HKS2019] E70 (hereafter E70), [KPS2012] MWSC 0620 (hereafter KPS0620), and IRAS 05331+3115 in the outer Galactic…
View article: Low-mass Stellar and Substellar Content of the Young Cluster Berkeley 59
Low-mass Stellar and Substellar Content of the Young Cluster Berkeley 59 Open
We present a multiwavelength analysis of the young star cluster Berkeley 59, based on Gaia data and deep IR observations with the 3.58 m Telescopio Nazionale Galileo and Spitzer space telescope. The mean proper motion of the cluster is fou…
View article: Investigating the Star-forming Sites in the Outer Galactic Arm
Investigating the Star-forming Sites in the Outer Galactic Arm Open
We aim to investigate the global star formation scenario in star-forming sites AFGL 5157, [FSR2007] 0807 (hereafter FSR0807), [HKS2019] E70 (hereafter E70), [KPS2012] MWSC 0620 (hereafter KPS0620), and IRAS 05331+3115 in the outer galactic…
View article: Low-mass stellar and substellar content of the young cluster Berkeley 59
Low-mass stellar and substellar content of the young cluster Berkeley 59 Open
We present a multi-wavelength analysis of the young star cluster Berkeley 59 (Be 59) based on the $Gaia$ data and deep infrared (IR) observations with the 3.58-m Telescopio Nazionale Galileo and $Spitzer$ space telescope. The mean proper m…
View article: Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi
Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi Open
EX Lupi, a low-mass young stellar object, went into an accretion-driven outburst in 2022 March. The outburst caused a sudden phase change of ∼112° ± 5° in periodically oscillating multiband lightcurves. Our high-resolution spectra obtained…
View article: Discovery of a hot post-AGB star in Galactic globular cluster E3
Discovery of a hot post-AGB star in Galactic globular cluster E3 Open
We report a new hot post-asymptotic giant branch (PAGB) star in the Galactic globular cluster (GC) E3, which is one of the first of the identified PAGB stars in a GC to show a binary signature. The star stands out as the brightest source i…
View article: Initial results of our spectro-photometric monitoring of XZ Tau
Initial results of our spectro-photometric monitoring of XZ Tau Open
We present here initial results of our spectro-photometric monitoring of XZ Tau. During our monitoring period, XZ Tau exhibited several episodes of brightness variations in timescales of months at optical wavelengths in contrast to the mid…
View article: Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi
Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi Open
EX Lupi, a low-mass young stellar object, went into an accretion-driven outburst in March of 2022. The outburst caused a sudden phase change of ~ 112$^{\circ}$ $\pm$ 5$^{\circ}$ in periodically oscillating multiband lightcurves. Our high r…
View article: Unveiling the Cosmic Cradle: clustering and massive star formation in the enigmatic Galactic bubble N59
Unveiling the Cosmic Cradle: clustering and massive star formation in the enigmatic Galactic bubble N59 Open
In this paper, we have conducted an investigation focused on a segment of the $Spitzer$ mid-infrared bubble N59, specifically referred to as R1 within our study. Situated in the inner Galactic plane, this region stands out for its hosting …
View article: Cluster Formation in a Filamentary Cloud: The Case of the Stellar Cluster NGC 2316
Cluster Formation in a Filamentary Cloud: The Case of the Stellar Cluster NGC 2316 Open
We present a multiwavelength analysis of the star cluster NGC 2316 and its surroundings. We estimated the physical parameters of the NGC 2316 cluster, including its shape (elongated), size ( R cluster = 0.4 pc), distance (1.3 ± 0.3 kpc), a…
View article: Constraints on Triton atmospheric evolution from occultations: 1989-2022
Constraints on Triton atmospheric evolution from occultations: 1989-2022 Open
Context - Around the year 2000, Triton's south pole experienced an extreme summer solstice that occurs every about 650 years, when the subsolar latitude reached about 50°. Bracketing this epoch, a few occultations probed Triton's atmospher…
View article: Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022
Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022 Open
Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the Triton atmosphere in …
View article: Understanding the relative importance of magnetic field, gravity, and turbulence in star formation at the hub of the giant molecular cloud G148.24+00.41
Understanding the relative importance of magnetic field, gravity, and turbulence in star formation at the hub of the giant molecular cloud G148.24+00.41 Open
The relative importance of magnetic fields, turbulence, and gravity in the early phases of star formation is still not well understood. We report the first high-resolution dust polarization observations at 850 $μ$m around the most massive …
View article: The Giant Molecular Cloud G148.24+00.41: gas properties, kinematics, and cluster formation at the nexus of filamentary flows
The Giant Molecular Cloud G148.24+00.41: gas properties, kinematics, and cluster formation at the nexus of filamentary flows Open
Filamentary flows towards the centre of molecular clouds have been recognized as a crucial process in the formation and evolution of stellar clusters. In this paper, we present a comprehensive observational study that investigates the gas …