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Browsing by Author "Mathur, S"

Browsing by Author "Mathur, S"

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  • Analysing Solar‐like Oscillations with an Automatic Pipeline 
    Mathur, S; Garcia, R. A; Regulo, C; Ballot, J; Salabert, D; Chaplin, W. J (American Institute of Physics, 2009)
    The Kepler mission will provide a huge amount of asteroseismic data during the next few years, among which hundreds of solar‐like stars will be targeted. The amount of stars and their observation length represent a step ...
  • The asteroseismic potential of Kepler: first results for solar-type stars 
    Chaplin, W. J; Appourchaux, T; Elsworth, Y; Garcia, R. A; Houdek, G; Karoff, C; Metcalfe, T. S; Molenda-Zakowicz, J; Monteiro, M. J. P. F. G; Thompson, M. J; Brown, T. M; Kiss, L. L; Kitiashvili, I. N; Kolenberg, K; Korhonen, H; Kosovichev, A. G; Kupka, F; Lebreton, Y; Leroy, B; Ludwig, H. G; Mathis, S; Michel, E; Miglio, A; Montalban, J; Moya, A; Noels, A; Noyes, R. W; Palle, P. L; Piau, L; Preston, H. L; Roca Cortes, T; Roth, M; Sato, K. H; Schmitt, J; Serenelli, A. M; Silva Aguirre, V; Stevens, I. R; Suarez, J. C; Suran, M. D; Trampedach, R; Turck-Chieze, S; Uytterhoeven, K; Ventura, R; Christensen-Dalsgaard, J; Gilliland, R. L; Kjeldsen, H; Borucki, W. J; Koch, D; Jenkins, J. M; Ballot, J; Basu, S; Bazot, M; Bedding, T. R; Benomar, O; Bonanno, A; Brandao, I. M; Bruntt, H; Campante, T. L; Creevey, O. L; Di Mauro, M. P; Dogan, G; Dreizler, S; Eggenberger, P; Esch, L; Fletcher, S. T; Frandsen, S; Gai, N; Gaulme, P; Handberg, R; Hekker, S; Howe, R; Huber, D; Korzennik, S. G; Lebrun, J. C; Leccia, S; Martic, M; Mathur, S; Mosser, B; New, R; Quirion, P. O; Regulo, C; Roxburgh, I. W; Salabert, D; Schou, J; Sousa, S. G; Stello, D; Verner, G. A; Arentoft, T; Barban, C; Belkacem, K; Benatti, S; Biazzo, K; Boumier, P; Bradley, P. A; Broomhall, A. M; Buzasi, D. L; Claudi, R. U; Cunha, M. S; D'Antona, F; Deheuvels, S; Derekas, A; Garcia Hernandez, A; Giampapa, M. S; Goupil, M. J; Gruberbauer, M; Guzik, J. A; Hale, S. J; Ireland, M. J (IOP Publishing, 2010-04)
    We present preliminary asteroseismic results from Kepler on three G-type stars. The observations, made at one-minute cadence during the first 33.5d of science operations, reveal high signal-to-noise solar-like oscillation ...
  • CEESA meets machine learning: a Constant Elasticity Earth Similarity Approach to habitability and classification of exoplanets 
    Basak, S; Saha, S; Mathur, S; Bora, K; Makhija, S; Safonova, M; Agarwal, S (Elsevier B.V, 2020-01)
    We examine the existing metrics of habitability and classification schemes of extrasolar planets and provide an exposition of the use of computational intelligence techniques to estimate habitability and to automate the ...
  • The CoRoT target HD175726: an active star with weak solar-like oscillations 
    Mosser, B; Michel, E; Appourchaux, T; Barban, C; Baudin, F; Boumier, P; Bruntt, H; Catala, C; Deheuvels, S; Garcia, R. A; Gaulme, P; Regulo, C; Roxburgh, I; Samadi, R; Verner, G; Auvergne, M; Baglin, A; Ballot, J; Benomar, O; Mathur, S (EDP Sciences, 2009-10)
    Context. The CoRoT short runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report observations of the star HD175726 that lasted for 27 days during the first ...
  • Detection of solar-like oscillations from Kepler photometry of the open cluster NGC 6819 
    Stello, D; Basu, S; Bruntt, H; Mosser, B; Stevens, I. R; Brown, T. M; Christensen-Dalsgaard, J; Gilliland, R. L; Kjeldsen, H; Arentoft, T; Ballot, J; Barban, C; Bedding, T. R; Chaplin, W. J; Elsworth, Y. P; Garcia, R. A; Goupil, M. J; Hekker, S; Huber, D; Mathur, S; Meibom, S; Samadi, R; Sangaralingam, V; Baldner, C. S; Belkacem, K; Biazzo, K; Brogaard, K; Suarez, J. C; D'Antona, F; Demarque, P; Esch, L; Gai, N; Grundah, F; Lebreton, Y; Jiang, B; Jevtic, N; Karoff, C; Miglio, A; Molenda-Zakowicz, J; Montalban, J; Noels, A; Roca Cortes, T; Roxburgh, I. W; Serenelli, A. M; Silva, V; Christiaan Sterken, A; Stine, P; Szabo, R; Weiss, A; Borucki, W. J; Koch, D; Jenkins, J. M (Institute of Physics, 2010-04)
    Asteroseismology of stars in clusters has been a long-sought goal because the assumption of a common age, distance and initial chemical composition allows strong tests of the theory of stellar evolution. We report results ...
  • Determining global parameters of the oscillations of solar-like stars 
    Mathur, S; Garcia, R. A; Regulo, C; Creevey, P. L; Ballot, J; Salabert, D; Arentoft, T; Quirion, P. O; Chaplin, W. J; Kjeldsen, H (EDP Sciences, 2010-02)
    Helioseismology has enabled us to better understand the solar interior, while also allowing us to better constrain solar models. But now is a tremendous epoch for asteroseismology as space missions dedicated to studying ...
  • A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry 
    Benomar, O; Baudin, F; Campante, T. L; Chaplin, W. J; García, R. A; Gaulme, P; Toutain, T; Verner, G. A; Appourchaux, T; Ballot, J; Barban, C; Elsworth, Y; Mathur, S; Mosser, B; Régulo, C; Roxburgh, I. W; Auvergne, M; Baglin, A; Catala, C; Michel, E; Samadi, R (EDP Sciences, 2009-11)
    Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the ...
  • GOLF: A New Proxy for Solar Magnetism 
    Mathur, S; Jimenez-Reyes, S. J; Garcia, R. A (GOLF: A New Proxy for Solar Magnetism, 2009)
    Solar magnetism is measured with different indices: for instance the Magnetic Plage Solar Index (MPSI) and the Mount Wilson Sunspot Index (MWSI), number of sunspots, radio flux at 10.7 cm, Ca II K, Mg II K, EUV, He I or ...
  • Host galaxy magnitude of OJ 287 from its colours at minimum light 
    Valtonen, Mauri J; Dey, Lankeswar; Zola, S; Ciprini, S; Kidger, M; Pursimo, T; Gopakumar, A; Matsumoto, K; Sadakane, K; Caton, D. B; Nilsson, K; Komossa, S; Bagaglia, M; Baransky, A; Boumis, P; Boyd, D; Castro-Tirado, A. J; Debski, B; Drozdz, M; Perez, A. Escartin; Fiorucci, M; Garcia, F; Gazeas, K; Ghosh, S; Godunova, V; Gomez, J. L; Gredel, R; Grupe, D; Haislip, J. B; Henning, T; Hurst, G; Janík, J; Kouprianov, V. V; Lehto, H; Liakos, A; Mathur, S; Mugrauer, M; Nogues, R. Naves; Nucciarelli, G; Ogloza, W; Ojha, D. K; Pajdosz-Śmierciak, U; Pascolini, S; Poyner, G; Reichart, D. E; Rizzi, N; Roncella, F; Sahu, D. K; Sillanpää, A; Simon, A; Siwak, M; Alfaro, F. C. Soldán; Sonbas, E; Tosti, G; Vasylenko, V; Webb, J. R; Zielinski, P (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)
    OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum light when the AGN activity is so low that ...
  • Interior and exterior clues of solar activity 
    Turck-Chièze, S; Brun, A. S; Duez, V; García, R. A; Mathis, S; Piau, L; Salabert, D; Pallé, P. L; Jiménez-Reyes, S. J; Mathur, S; Simoniello, R; Robillot, J. M (Springer, 2010)
    Two research paths are described to obtain better understanding of the origin of global solar activity. First, observations with a multichannel resonant spectrometer may reveal the dynamics of the solar core, the tachocline, ...
  • Low-degree high-frequency p and g modes in the solar core 
    Mathur, S; García, R. A; Eff-Darwich, A (Springer, 2010)
    Solar gravity (g) modes propagate within the radiative part of the solar interior and are highly sensitive to the physical conditions of the solar core. They would represent the best tool to infer the structure and the ...
  • On the flare induced high-frequency global waves in the sun 
    Kumar, B; Mathur, S; García, R. A; Venkatakrishnan, P (Institute of Physics, 2010-03-01)
    Recently, Karoff & Kjeldsen presented evidence of strong correlation between the energy in the high-frequency part (5.3 < ν < 8.3 mHz) of the acoustic spectrum of the Sun and the solar X-ray flux. They have used disk-integrated ...
  • On the line profile changes observed during the X2.2 class flare in the active region NOAA 11158 
    Bayanna, A. R; Kumar, B; Venkatakrishnan, P; Mathew, S. K; Ravindra, B; Mathur, S; Garcia, R. A (IOP Publishing, 2014-02)
    The solar active region NOAA 11158 produced a series of flares during its passage through the solar disk. The first major flare (of class X2.2) of the current solar cycle occurred in this active region on 2011 February 15 ...
  • Seismic and spectroscopic characterization of the solar-like pulsating CoRoT target HD 49385 
    Deheuvels, S; Bruntt, H; Michel, E; Barban, C; Verner, G; Régulo, C; Mosser, B; Mathur, S; Gaulme, P; Garcia, R. A; Boumier, P; Appourchaux, T; Samadi, R; Catala, C; Baudin, F; Baglin, A; Auvergne, M; Roxburgh, I. W; Pérez Hernández, F (EDP Science, 2010-06-11)
    Context. The star HD 49385 is the first G-type solar-like pulsator observed in the seismology field of the space telescope CoRoT. The satellite collected 137 days of high-precision photometric data on this star, confirming ...
  • Sensitivity of the Calculated g-Mode Frequencies to Pulsation Codes and their Parameters 
    Moya, A; Mathur, S; García, R. A (Springer, 2011-02)
    From the recent work of the Evolution and Seismic Tools Activity (ESTA: Monteiro et al., ESA, SP-1306, 363 – 371, 2006 and Lebreton et al., Astrophys. Space Sci. 316, 1 – 12, 2008), whose Task 2 is devoted to comparing ...
  • Solar-like oscillations in HD 181420: data analysis of 156 days of CoRoT data 
    Barban, C; Deheuvels, S; Baudin, F; Appourchaux, T; Auvergne, M; Ballot, J; Boumier, P; Chaplin, W. J; Garcia, R. A; Gaulme, P; Michel, E; Mosser, B; Regulo, C; Roxburgh, I. W; Verner, G; Baglin, A; Catala, C; Samadi, R; Bruntt, H; Elsworth, Y; Mathur, S (EDP Sciences, 2009-10)
    Context. The estimate of solar-like oscillation properties, such as their frequencies, amplitudes and lifetimes, is challenging because of their low amplitudes and will benefit from long and uninterrupted observing runs. ...
  • Solar-like oscillations in low-luminosity red giants: first results from Kepler 
    Bedding, T. R; Huber, D; Stello, D; Elsworth, Y. P; Hekker, S; Kallinger, T; Mathur, S; Mosser, B; Preston, H. L; Ballot, J; Barban, C; Broomhall, A. M; Buzasi, D. L; Chaplin, W. J; Garcia, R. A; Gruberbauer, M; Hale, S. J; De Ridder, J; Frandsen, S; Borucki, W. J; Brown, T; Christensen-Dalsgaard, J; Gilliland, R. L; Jenkins, J. M; Kjeldsen, H; Koch, D; Belkacem, K; Bildsten, L; Bruntt, H; Campante, T. L; Deheuvels, S; Derekas, A; Dupret, M. A; Goupil, M. J; Hatzes, A; Houdek, G; Ireland, M. J; Jiang, C; Karoff, C; Kiss, L. L; Lebreton, Y; Miglio, A; Montalban, J; Noels, A; Roxburgh, I. W; Sangaralingam, V; Stevens, I. R; Suran, M. D; Tarrant, N. J; Weiss, A (IOP Publishing, 2010-04)
    We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30-minute sampling, reveal clear ...
  • Solar-like oscillations with low amplitude in the CoRoT target HD 181906 
    Garcia, R. A; Regulo, C; Samadi, R; Ballot, J; Barban, C; Benomar, O; Chaplin, W. J; Gaulme, P; Appourchaux, T; Mathur, S; Mosser, B; Toutain, T; Verner, G. A; Auvergne, M; Baglin, A; Baudin, F; Boumier, P; Bruntt, H; Catala, C; Deheuvels, S; Elsworth, Y; Jimenez-Reyes, S. J; Michel, E; Perez Hernandez, F; Roxburgh, I. W; Salabert, D (EDP Sciences, 2009-10)
    Context: The F8 star HD 181906 (effective temperature ~6300K) was observed for 156 days by the CoRoT satellite during the first long run in the centre direction. Analysis of the data reveals a spectrum of solar-like acoustic ...
  • Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44 
    Joshi, Santosh; Trust, Otto; Semenko, E; Williams, P. E; Lampens, P; De Cat, P; Vermeylen, L; Holdsworth, D. L; García, R. A; Mathur, S; Santos, A. R. G; Mkrtichian, D; Goswami, A; Cuntz, M; Yadav, A. P; Sarkar, M; Bhatt, B. C; Kahraman Alicavus, F; Nhlapo, M. D; Lund, M. N; Goswami, P. P; Savanov, I; Jorissen, A; Jurua, E; Avvakumova, E; Dmitrienko, E. S; Chakradhari, N. K; Das, M. K; Chowdhury, S; Abedigamba, O. P; Yakunin, I; Letarte, B; Karinkuzhi, D (Oxford University Press on behalf of Royal Astronomical Society, 2022-03)
    We present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the high-precision photometric K2 data reveals ...
  • What Can We Learn on the Structure and the Dynamics of the Solar Core with g Modes? 
    Mathur, S; Eff-Darwich, A; García, R. A; Jimenez-Reyes, S. J; Korzennik, S. G; Turck-Chieze, S (Astronomical Society of the Pacific, 2009-12)
    The detection of the signature of dipole gravity modes has opened the path to study the solar inner radiative zone. Indeed, g modes should be the best probes to infer the properties of the solar nuclear core that represents ...

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