IIA Institutional Repository: Recent submissions

  • Ni, Qingling; Brand, W. N; Chen, Chien-Ting; Luo, Bin; Nyland, Kristina; Yang, Guang; Zou, Fan; Aird, James; Alexander, David M; Bauer, Franz Erik; Lacy, Mark; Lehmer, Bret D; Mallick, Labani; Salvato, Mara; Schneider, Donald P; Tozzi, Paolo; Traulsen, Iris; Vaccari, Mattia; Vignali, Cristian; Vito, Fabio; Xue, Yongquan; Banerji, Manda; Chow, Kate; Comastri, Andrea; Del Moro, Agnese; Gilli, Roberto; Mullaney, James; Paolillo, Maurizio; Schwope, Axel; Shemmer, Ohad; Sun, Mouyuan; Timlin III, John D; Trump, Jonathan R (IOP Publishing, 2021-09)
    We present the X-ray point-source catalogs in two of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) fields, W-CDF-S (4.6 deg2) and ELAIS-S1 (3.2 deg2), aiming to fill the gap between deep pencil-beam ...
  • Chung, Eun Jung; Lee, Chang Won; Kim, Shinyoung; Maheswar, G; Tafalla, Mario; Caselli, Paola; Myers, Philip C; Liu, Tie; Yoo, Hyunju; Kim, Kyoung Hee; Kim, Mi-Ryang; Soam, Archana; Cho, Jungyeon; Kwon, Woojin; Lee, Changhoon; Kan, Hyunwoo (IOP Publishing, 2021-09-20)
    We present the results on the physical properties of filaments and dense cores in IC 5146, as a part of the TRAO FUNS project. We carried out on-the-fly mapping observations using the Taeduk Radio Astronomy Observatory ...
  • Safonova, M; Mathur, Archana; Basak, Suryoday; Bora, Kakoli; Agrawal, Surbhi (Jointly published by EDP Sciences, Società Italiana di Fisica and Springer Berlin Heidelberg, 2021-09)
    What is habitability? Can we quantify it? What do we mean under the term habitable or potentially habitable planet? With estimates of the number of planets in our Galaxy alone running into billions, possibly a number greater ...
  • Basak, Suryoday; Mathur, Archana; Theophilus, Abhijit Jeremiel; Deshpande, Gouri; Murthy, J (Jointly published by EDP Sciences, Springer-Verlag GmbH, 2021-09)
    We explore the efficacy of machine learning (ML) in characterizing exoplanets into different classes. The source of the data used in this work is University of Puerto Rico’s Planetary Habitability Laboratory’s Exoplanets ...
  • Kapoor, R. C (National Astronomical Research Institute of Thailand, 2021-11)
    The Tai-Ahom are an ethnic group, the admixed descendants of the Tai or Shan people who migrated from North Burma into the Brahmaputra Valley of Assam in India in the early decades of the thirteenth century. Their history ...
  • Kapoor, R. C (National Astronomical Research Institute of Thailand, 2021-11)
    This paper discusses the observations of the Great March Comet of 1843 made from India. The observers were at various locations and the newly formed observatories participated in the astronomical observations spread over ...
  • Ramesh, R; Kathiravan, C; Mithun, N. P. S; Vadawale, S. V (IOP Publishing, 2021-09-01)
    We analyzed ground-based low frequency (<100 MHz) radio spectral and imaging data of the solar corona obtained with the facilities in the Gauribidanur observatory during the same time as the very weak soft X-ray flares ...
  • Barve, Indrajit V; Kathiravan, C; Gireesh, G. V. S; Anand, M. N; Rajesh, M; Rajalingam, M; Ebenezer, E; Ramesh, R (Springer Nature B.V., 2021-09)
    The Indian Institute of Astrophysics (IIA) has commissioned a low frequency (<100 MHz) spectrograph at its Kodaikanal Solar Observatory (KSO) for coordinated observations of transients in the solar atmosphere with other ...
  • Shantikumar, N. S; Song, H.- J; Mugil, S. K; Dumka, U. C; Larson, E. J. L; Brijesh Kumar; Sagar, R (Oxford University Press on behalf of Royal Astronomical Society, 2021-11)
    The estimation of the night-time cloud fraction (CF) is found to be one of the key parameters for evaluating the number of useful nights at an astronomical site. This work evaluates useful astronomical night-time observation ...
  • Bhowmick, A (Indian Institute of Astrophysics, 2020-12)
    The existence of hydrogen-deficient stars in a hydrogen-dominated universe in itself, sparks a considerable curiosity to explore their origin and evolution. Very rare in nature, the peculiar characteristics of these ...
  • Jaiswal, Bhavesh; Mahapatra, G; Nandi, Anuj; Sudhakar, M; Sankarasubramanian, K; Sheel, V (Elsevier B. V, 2021-07)
    The study of polarized sunlight scattered from planetary atmospheres provides diagnostic tools that can help explore the possible composition and size distribution of clouds and aerosol particles. Previous studies have ...
  • Sazhin, M. V; Safonova, M. V; Sementsov, V. N (Springer, 2021-05)
    Nonstandard techniques to deliver a payload from the Moon to Earth are explored. Two approaches are compared, which are based on using a space elevator and an acceleration device, the Artsimovich railgun. The energy needed ...
  • Chakrabarty, Aritra; Sengupta, S (IOP Publishing, 2021-08-20)
    Similar to the case of solar system planets, reflected starlight from exoplanets is expected to be polarized due to atmospheric scattering, and the net disk-integrated polarization should be nonzero owing to the asymmetrical ...
  • Susmitha, A; Ojha, D. K; Sivarani, T; Ninan, J. P; Bandyopadhyay, A; Surya, Arun; Unni, Athira (Oxford University Press on behalf of Royal Astronomical Society, 2021-09)
    We present the abundance analyses of seven carbon enhanced metal-poor (CEMP) stars to understand the origin of carbon in them. We used high-resolution optical spectra to derive abundances of various elements. We also used ...
  • Mishra, Wageesh; Dave, Kunjal; Srivastava, N; Teriaca, L (Oxford University Press on behalf of Royal Astronomical Society, 2021-09)
    We present multipoint remote and in situ observations of interplanetary coronal mass ejection (ICME) structures during the year 2011. The selected ICMEs arrived at Earth on 2011 March 11 and 2011 August 6, and led to ...
  • Pandey, Sindhu; Subramaniam, A; Jadhav, Vikrant V (Oxford University Press on behalf of the Royal Astronomical Society, 2021-10)
    Blue stragglers stars (BSSs) in M67 have attracted attention from observations and theory to unravel their formation mechanisms. In the series of Ultra Violet Imaging Telescope (UVIT on AstroSat) study of Open clusters ...
  • Gireesh, G. V. S; Kathiravan, C; Barve, Indrajit V; Ramesh, R (Springer, 2021-08)
    The radio astronomy group in the Indian Institute of Astrophysics (IIA) has been carrying out routine observations of radio emission from the solar corona at low frequencies (≈40 – 440 MHz) at the Gauribidanur observatory, ...
  • Jadhav, Vikrant V; Subramaniam, A (Oxford University Press on behalf of the Royal Astronomical Society, 2021-10)
    Blue straggler stars (BSSs) are the most massive stars in a cluster formed via binary or higher-order stellar interactions. Though the exact nature of such formation scenarios is difficult to pin down, we provide observational ...
  • Venkata Suresh, Narra; Prasad, B. R (SPIE, 2021-07)
    To meet the proposed science goals of the Visible Emission Line Coronagraph on board the Aditya-L1 mission, the total scattered light should be less than 5 ppm (parts per million) of solar disk brightness over the field ...
  • Venkata Suresh, Narra; Prasad, B. R; Somasundaram, P. K; Kathiravan, S; Venkatasubramanian, N; Padavu, U. K; Mani, V. T; Basavaraja, S; Naik, Rajesh (Springer Nature B.V., 2020-12)
    Molecular contamination on optical surfaces is a serious issue for space payloads. For ultraviolet (UV) payloads, molecular contamination results in loss of throughput. Whereas, for visible (VIS) payloads loss of throughput ...

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