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Browsing by Author "Murthy, J"

Browsing by Author "Murthy, J"

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  • A catalogue of 108 extended planetary nebulae observed by GALEX 
    Pradhan, Ananta C; Panda, Swayamtrupta; Parthasarathy, M; Murthy, J; Ojha, Devendra K (Springer, 2019-10)
    We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-UV (NUV). We have compiled a catalogue of ...
  • Characterization of the HD 219134 multi-planet system I. Observations of stellar magnetism, wind, and high-energy flux 
    Folsom, C. P; Fossati, L; Wood, B. E; Sreejith, A. G; Cubillos, P. E; Vidotto, A. A; Alecian, E; Girish, V; Lichtenegger, H; Murthy, J; Petit, P; Valyavin, G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    HD 219134 hosts several planets, with seven candidates reported, and the two shortest period planets are rocky (4–5 M⊕) and transit the star. Here, we present contemporaneous multiwavelength observations of the star ...
  • Characterization of the HD 219134 multi-planet system II. Stellar-wind sputtered exospheres in rocky planets b & c 
    Vidotto, A. A; Lichtenegger, H; Fossati, L; Folsom, C. P; Wood, B. E; Murthy, J; Petit, P; Sreejith, A. G; Valyavin, G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    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 sputtered by the wind of the host star. The ...
  • Characterization of the HD 219134 multi-planet system II. Stellar-wind sputtered exospheres in rocky planets b & c 
    Vidotto, A. A; Lichtenegger, H; Fossati, L; Folsom, C. P; Wood, B. E; Murthy, J; Petit, P; Sreejith, A. G; Valyavin, G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    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 sputtered by the wind of the host star. The ...
  • Comparing the inner and outer star-forming complexes in the nearby spiral galaxies NGC 628, NGC 5457, and NGC 6946 using UVIT observations 
    Yadav, Jyoti; Mousumi Das; Patra, Narendra Nath; Dwarakanath, K. S; Rahna, P. T; McGaugh, S. S; Schomber, James; Murthy, J (IOP Publishing, 2021-06-10)
    We present a far-UV (FUV) study of the star-forming complexes (SFCs) in three nearby galaxies using the Ultraviolet Imaging Telescope. The galaxies are close to face-on and show significant outer disk star formation. Two ...
  • A comparison of the UV and HI properties of the extended UV (XUV) disk galaxies NGC 2541, NGC 5832 and ESO406-042 
    Mousumi Das; Yadav, J; Patra, N; Dwarakanath, K. S; McGaugh, S. S; Schombert, J; Rahna, P. T; Murthy, J (Indian Academy of Sciences, 2021-10)
    We present a UV study of 3 extended UV (XUV) galaxies that we have observed with the UVIT and the GMRT. XUV galaxies show filamentary or diffuse star formation well beyond their optical disks, in regions where the disk ...
  • A Compilation of Interstellar Column Densities 
    Gudennavar, S. B; Bubbly, S. G; Preethi, K; Murthy, J (IOP Publishing, 2012-03)
    We have collated absorption line data toward 3008 stars in order to create a unified database of interstellar column densities. These data have been taken from a number of different published sources and include many ...
  • Components of the diffuse ultraviolet radiation at high latitudes 
    Akshaya, M. S; Murthy, J; Ravichandran, S; Henry, R. C; Overduin, J (Oxford University Press on behalf of the Royal Astronomical Society, 2019-08-08)
    We have used data from the Galaxy Evolution Explorer to study the different components of the diffuse ultraviolet background in the region between the Galactic latitudes 70◦–80◦. We find an offset at zero dust column density ...
  • Depletion Studies in the Interstellar Medium 
    Haris, U; Parvathi, V. S; Gudennavar, S. B; Murthy, J (American Institute of Physics, 2013-06)
    We report interstellar Si depletion and dust-phase column densities of Si along 131 Galactic sight lines using previously reported gas-phase Si II column densities, after correcting for the differences in oscillator ...
  • Design and analysis of an FUV spectrograph for a small satellite 
    Munshi, R; Prasad, B. R; Murthy, J (Astronomical Society of India, 2009-06)
    The Halo Ultraviolet Explorer (HUE) is a payload aimed at studying the diffuse far ultraviolet sky over a bandpass of 800 -- 1200 Ao. The novel features of HUE include a large effective collecting area (254 cm2) and fast ...
  • Design and modeling of a tunable spatial heterodyne spectrometer for emission line studies 
    Nirmal, K; Sridharan, R; Sriram, S; Murthy, J; Ambily, S; Safonova, M; Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar (SPIE--The International Society for Optical Engineering, 2018-04)
    Spatial heterodyne spectroscopy (SHS) is an interferometric technique similar to the Fourier transform spectroscopy with heritage from the Michelson interferometer. An imaging detector is used at the output of an SHS to ...
  • Determining Interstellar Carbon Abundances from Strong-line Transitions 
    Sofia, U. J; Parvathi, V. S; Babu, B. R. S; Murthy, J (IOP Publishing, 2011-01)
    Carbon is arguably the most important element in the interstellar medium, yet its abundance in gas and dust is poorly understood due to a paucity of data. We explore the possibility of substantially increasing our knowledge ...
  • Development of Data Acquisition Methods for an FPGA-Based Photon Counting Detector 
    Ambily, S; Mayuresh, Sarpotdar; Mathew, J; Sreejith, A. G; Nirmal, K; Prakash, A; Safonova, M; Murthy, J (World Scientific Publishing Co., 2017-03)
    MCP-based detectors are widely used in the ultraviolet (UV) region due to their low noise levels, high sensitivity and good spatial and temporal resolution. We have developed a compact near-UV (NUV) detector for highaltitude ...
  • The Diffuse Radiation Field at High Galactic Latitudes 
    Akshaya, M. S; Murthy, J; Ravichandran, S; Henry, R. C; Overduin, J (IOP Publishing, 2018-08-10)
    We have used GALEX observations of the north and south Galactic poles to study the diffuse ultraviolet background at locations where the Galactic light is expected to be at a minimum. We find offsets of 230–290 photon units ...
  • Diffuse radiation from the Aquila Rift 
    Jyothy, S. N; Murthy, J; Karuppath, N; Sujatha, N. V (Oxford University Press on behalf of the Royal Astronomical Society, 2015-12-01)
    We present an analysis of the diffuse ultraviolet (UV) background in a low latitude region near the Aquila Rift based on observations made by the Galaxy Evolution Explorer (GALEX). The UV background is at a level of about ...
  • The Diffuse Ultraviolet Foreground 
    Murthy, J (Springer, 2014-01)
    Ultraviolet observations from low Earth orbit (LEO) have to deal with a foreground comprised of airglow and zodiacal light which depend on the look direction and on the date and time of the observation. We have used all-sky ...
  • Discovering a celestial object using a non-parametric algorithm 
    Vyasanakere, Jayanth P; Bhatnagar, Siddharth; Murthy, J (Springer, 2021-12)
    We describe a method that does not use any orbital parameters, to arrive at the position and mass of a new celestial object, using high-precision orbital state vector data of the rest of the objects in the system. As ...
  • The distribution and kinematics of interstellar O VI in the milky way 
    Sarma, R; Pathak, A; Murthy, J; Sarma, J. K (Oxford University Press on behalf of the Royal Astronomical Society, 2017-02)
    We present the results of a survey of interstellar O VI absorption in the Milky Way (MW) towards 69 stars in the Large Magellanic Cloud obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). The integrated MW ...
  • Dust properties from GALEX observations of a UV halo around Spica 
    Shalima, P; Murthy, J; Gupta, R (Terra Scientific Publishing Company, 2013-10-24)
    GALEX has detected ultraviolet halos extending as far as 5° around four bright stars (Murthy and Henry, 2011). These halos are produced by scattering of starlight by dust grains in thin foreground clouds that are not ...
  • Dust Properties in the Far-Ultraviolet in Ophiuchus 
    Sujatha, N. V; Shalima, P; Murthy, J; Henry, R. C (The American Astronomical Society, 2005-11)
    We have derived the albedo (a) and phase function asymmetry factor (g) of interstellar dust grains at 1100 Å using archival Voyager observations of diffuse radiation in Ophiuchus. We have found that the grains are highly ...

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