Publications (14)
Characterisation of the HD 219134 multi-planet system I. Observations of stellar magnetism, wind, and high-energy flux
C. P. Folsom, L. Fossati, B. E. Wood +9
HD 219134 hosts several planets, with seven candidates reported, and the two shortest period planets are rocky (4-5 ) and transit the star. Here we present contemporane…
Planets in the Early Universe
Yu. A. Shchekinov, M. Safonova, J. Murthy
Several planets have recently been discovered around old metal-poor stars, implying that these planets are also old, formed in the early Universe. The canonical theory suggests tha…
Characterisation of the HD219134 multi-planet system II. Stellar-wind sputtered exospheres in rocky planets b & c
A. A. Vidotto, H. Lichtenegger, L. Fossati +6
We present a 3D study of the formation of refractory-rich exospheres around the rocky planets HD219134b and c. These exospheres are formed by surface particles that have been sputt…
In-orbit Performance of UVIT and First Results
S. N. Tandon, J. B. Hutchings, S. K. Ghosh +23
The performance of the ultraviolet telescope (UVIT) on-board ASTROSAT is reported. The performance in orbit is also compared with estimates made from the calibrations done on the g…
Science with a wide-field UV transient explorer
I. Sagiv, A. Gal-Yam, E. O. Ofek +11
The time-variable electromagnetic sky has been well-explored at a wide range of wavelengths. Numerous high-energy space missions take advantage of the dark Gamma-ray and X-ray sky…
Simultaneous X-ray/UV observations of ultraluminous X-ray source Holmberg II X-1 with Indian space mission AstroSat
A. Vinokurov, K. Atapin, O. P. Bordoloi +11
We present the results of 8 epochs of simultaneous UV and X-ray observations of the highly variable ultraluminous X-ray source (ULX) Holmberg II X-1 with AstroSat -- Indian multiwa…
The Horizontal Branch population of NGC 1851 as revealed by the Ultra-violet Imaging Telescope (UVIT)
Annapurni Subramaniam, Snehalata Sahu, Joseph E. Postma +15
We present the UV photometry of the globular cluster NGC 1851 using images acquired with the Ultra-violet Imaging Telescope (UVIT) onboard the ASTROSAT satellite. PSF-fitting photo…
Modelling the scattering by porous aggregate dust grains in the Far-Ultraviolet halos of Spica and Achernar
Nilanjana Dey Choudhury, P. Shalima, Keerthana U. +1
Far-Ultraviolet (FUV) halos have been detected around six bright stars by Murthy and Henry (2011) using GALEX observations. These halos are thought to be caused by forward scatteri…
Planetary Nebulae with Ultra-Violet Imaging Telescope (UVIT): Far Ultra-violet halo around the Bow Tie nebula (NGC 40)
N. Kameswara Rao, F. Sutaria, J. Murthy +3
Context. NGC 40 is a planetary nebula with diffuse X-ray emission, suggesting an interaction of the high speed wind from WC8 central star (CS) with the nebula. It shows strong Civ…
Age Aspects of Habitability
M. Safonova, J. Murthy, Yu. A. Shchekinov
A habitable zone of a star is defined as a range of orbits within which a rocky planet can support liquid water on its surface. The most intriguing question driving the search for…
Ultra Violet Imaging Telescope (UVIT) on ASTROSAT
Amit Kumar, S. K. Ghosh, J. Hutchings +10
Ultra Violet Imaging Telescope on ASTROSAT Satellite mission is a suite of Far Ultra Violet (FUV 130 to 180 nm), Near Ultra Violet (NUV 200 to 300 nm) and Visible band (VIS 320 to…
A Multi-wavelength Study of the Dual Nuclei in Mrk 212
K. Rubinur, P. Kharb, M. Das +5
We present radio observations of the galaxy merger remnant Mrk 212 with the Karl G. Jansky Very Large Array (VLA) and the upgraded Giant Meter Radio Telescope (uGMRT). Mrk 212 has…
The Lyman alpha Sky as Observed by New Horizons
G. R. Gladstone, J. M. Shull, W. R. Pryor +22
During September 2023 the Alice ultraviolet spectrograph on the New Horizons (NH) spacecraft was used to map diffuse Lyman alpha (Lya) emission over most of the sky, at a range of…
Planetary Nebulae with UVIT II: Revelations from FUV vision of Butterfly Nebula NGC 6302
N. Kameswara Rao, O. De Marco, S. Krishna +4
The high excitation planetary nebula, NGC 6302, has been imaged in two far-ultraviolet (FUV) filters, F169M (Sapphire; λ: 1608 à ) and F172M (Silica; λ: 1…