Prof. Sivarani Thirupathi Profile

Prof. Sivarani Thirupathi

Professor at Indian Institute of Astrophysics

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 30 September 2024 Presentation + Paper

Presentation + Paper

Design and simulation of non-redundant aperture masks for SCALES

Mackenzie Lach, Stephanie Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Timothy Brandt, Zackery Briesemeister, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Katherine de Kleer, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Imke de Pater, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 13095, 130950Y (2024) https://doi.org/10.1117/12.3019285

KEYWORDS: Design, Mirrors, Image restoration, Adaptive optics, Solar system, Optical path differences, Exoplanets, Telescopes, Spatial resolution, Source mask optimization

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Proceedings Article | 17 September 2024 Poster + Paper

Poster + Paper

Characterizing exoplanet atmospheres with SCALES medium-spectral-resolution angular differential imaging

Aditi Desai, Steph Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Mackenzie Lach, Mike Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, R. Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 13096, 130969C (2024) https://doi.org/10.1117/12.3020521

KEYWORDS: Planets, Stars, Point spread functions, Exoplanets, Speckle, Atmospheres, Spectral resolution, Atmospheric modeling, Simulations, Signal to noise ratio

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

Slitless spectroscopy simulations of Milky Way dwarf satellite galaxies using TMT-WFOS

Devika Divakar, Sivarani Thirupathi, Ramya Sethuram, Jason Fucik, Chuck Steidel, Manjunath Bestha, Prasanna Deshmukh

Proceedings Volume 13099, 130992C (2024) https://doi.org/10.1117/12.3019070

KEYWORDS: Stars, Simulations, Spectroscopy, Satellites, Galactic astronomy

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Proceedings Article | 19 July 2024 Poster

Poster

Optical design and analysis of calibration system for SCALES instrument

Amirul Hasan, Ravinder K. Banyal, Renate Kupke, Andrew J. Skemer, Ajin Prakash, Sivarani Thirupathi, Deno Stelter, Ramya Sethuram, Arun Surya, Nick MacDonald, Steph Sallum, Mackenzie Lach, Scott Lilley

Proceedings Volume 13096, 130966X (2024) https://doi.org/10.1117/12.3019833

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Proceedings Article | 18 July 2024 Presentation + Paper

Presentation + Paper

SCALES status report

R. Deno Stelter, Andrew Skemer, Stephanie Sallum, Nick MacDonald, Renate Kupke, Christopher Ratliff, Cyril Bourgenot, Gerald Cabak, Michael Gonzales, Cristian Rodriguez, Aaron Hunter, Ravinder Banyal, Thirupathi Sivarani, Michael Fitzgerald, Marc Kassis, Olivier Absil, Carlos Alvarez, Natatsha Batalha, Marc-André Boucher, Timothy Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Dicakar, Étienne Gauvin, Thomas Greene, Armirul Hasan, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Govinda K. V., Isabel Kain, Mackenzie Lach, Jean-Thomas Landry, Michael Liu, Jim Lyke, Kenneth Magone, Eduardo Marin, Raquel Martinez, Dimitri Mawet, Rosalie McGurk, Brittany Miles, Ajin Parkash, Dale Sandford, Ramya Sethuram, Patrick Sheehan, Ji Man Sohn, Jordan Stone, Arun Surya, Hari Varshney, Eric Wang

Proceedings Volume 13096, 1309619 (2024) https://doi.org/10.1117/12.3020806

KEYWORDS: Mirrors, Cryostats, Coronagraphy, Spectrographs, Telescopes, Imaging systems, Exoplanets

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Proceedings Article | 18 July 2024 Poster + Paper

Poster + Paper

A multi-functional fiber positioning system for extremely large telescopes

Manjunath Bestha, T. Sivarani, Arun Surya, Sudharsan Yadav, Athira Unni, Parvathy M., Devika Divakar, S. Sriram, Ajin Prakash, Amirul Hasan

Proceedings Volume 13096, 1309661 (2024) https://doi.org/10.1117/12.3019098

KEYWORDS: Design, Spectroscopy, Telescopes, Mirrors, Large telescopes, Spectrographs, Astronomical imaging, Dichroic mirrors, Dispersion, Optical fibers

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Proceedings Article | 18 July 2024 Poster + Paper

Poster + Paper

Performance analysis of SCALES final optical design: end to end modeling

Arun Surya, Renate Kupke, Deno Stelter, Phil Hinz, Stephanie Sallum, Amirul Hasan, Andrew Skemer, Sivarani Thirupathi, Ravinder Banyal, Athira Unni

Proceedings Volume 13096, 130966W (2024) https://doi.org/10.1117/12.3019578

KEYWORDS: Spectrographs, Modeling, Sensors, Point spread functions, Optical design, Tunable filters, Zemax, Spectral resolution, Ray tracing, Optical filters

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Proceedings Article | 6 October 2023 Presentation

Presentation

End to end modeling of SCALES spectrograph for Keck Observatory

Arun Surya, Renate Kupke, Deno Stelter, Philip Hinz, Amirul Hasan, Andrew Skemer, Stephanie Sallum, Thirupathi Sivarani, Ravinder Banyal

Proceedings Volume 12680, 1268005 (2023) https://doi.org/10.1117/12.2677759

KEYWORDS: Spectrographs, Modeling, Keck Observatory, Equipment, Point spread functions, Geometrical optics, Data modeling, Spectroscopes, Spectral resolution, Microlens

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Simulating medium-spectral-resolution exoplanet characterization with SCALES angular/reference differential imaging

Aditi Desai, Stephanie Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Mackenzie Lach, Mike Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, R. Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268023 (2023) https://doi.org/10.1117/12.2677846

KEYWORDS: Exoplanets, Planets, Stars, Spectroscopy, Spectrographs, Spectral resolution, Speckle, Simulations, Lens arrays, Iterated function systems

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Designing custom medium resolution observing modes to trace planet accretion with SCALES

Raquel Martinez, Steph Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Renate Kupke, Mackenzie Lach, Mike Liu, Bruce Macintosh, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 126801W (2023) https://doi.org/10.1117/12.2677530

KEYWORDS: Planets, Spectroscopy, Exoplanets, Data modeling, Tunable filters, Thermography, Systems modeling, Spectrographs, Planetary systems, Optical filters

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

The slicer combined with array of lenslets for exoplanet spectroscopy (SCALES): driving science cases and expected outcomes

Steph Sallum, Andrew Skemer, Deno Stelter, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Rebecca Jensen-Clem, Isabel Kain, Charlie Kilpatrick, Renate Kupke, Mackenzie Lach, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Ramya Sethuram, Patrick Sheehan, Justin Spilker, Jordan Stone, Arun Surya, Sivarani Thirupathi, Athira Unni, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268003 (2023) https://doi.org/10.1117/12.2677831

KEYWORDS: Planets, Simulations, Exoplanets, Equipment, Spectroscopes, Spectrographs, Solar system, Lens arrays, Keck Observatory, Galactic astronomy

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Recovering simulated planet and disk signals using SCALES aperture masking

Mackenzie Lach, Steph Sallum, Ravinder Banyal, Natalie Batalha, Geoff Blake, Tim Brandt, Zackery Briesemeister, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Katherine de Kleer, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Imke de Pater, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268024 (2023) https://doi.org/10.1117/12.2677954

KEYWORDS: Design and modelling, Planets, Imaging systems, Exoplanets

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

The development of HISPEC for Keck and MODHIS for TMT: science cases and predicted sensitivities

Quinn Konopacky, Ashley Baker, Dimitri Mawet, Michael Fitzgerald, Nemanja Jovanovic, Charles Beichman, Garreth Ruane, Rob Bertz, Hiroshi Terada, Richard Dekany, Larry Lingvay, Marc Kassis, David Anderson, Motohide Tamura, Björn Benneke, Thomas Beatty, Tuan Do, Shogo Nishiyama, Peter Plavchan, Jason Wang, Ji Wang, Adam Burgasser, Jean-Baptiste Ruffio, Huihao Zhang, Aaron Brown, Jason Fucik, Aidan Gibbs, Rose Gibson, Sam Halverson, Christopher Johnson, Sonia Karkar, Takayuki Kotani, Evan Kress, Stephanie Leifer, Kenneth Magnone, Jerome Maire, Rishi Pahuja, Michael Porter, Mitsuko Roberts, Ben Sappey, Jim Thorne, Eric Wang, Etienne Artigau, Geoffrey Blake, Gabriela Canalizo, Guo Chen, Greg Doppmann, René Doyon, Courtney Dressing, Min Fang, Thomas Greene, Greg Herczeg, Lynne Hillenbrand, Andrew Howard, Stephen Kane, Tiffany Kataria, Eliza Kempton, Heather Knutson, David Lafrenière, Chao Liu, Stanimir Metchev, Max Millar-Blanchaer, Norio Narita, Gajendra Pandey, S.P. Rajaguru, Paul Robertson, Colette Salyk, Bun'ei Sato, Evertt Schlawin, Sujan Sengupta, Thirupathi Sivarani, Warren Skidmore, Gautam Vasisht, Chikako Yasui, Hui Zhang

Proceedings Volume 12680, 1268007 (2023) https://doi.org/10.1117/12.2681522

KEYWORDS: Planets, Stars, Exoplanets, Spectrographs, Atmospheres, Spectroscopy, Telescopes

Read Abstract +

Proceedings Article | 4 October 2023 Poster + Paper

Poster + Paper

Atmospheric dispersion corrector for a multi-object spectroscopic mode of HROS-TMT

Manjunath Bestha, Amirul Hasan, Devika Divakar, Arun Surya, S. Sriram, T. Sivarani, Ajin Prakash, Parvathy M., Sudharshan Yadav

Proceedings Volume 12677, 126770Q (2023) https://doi.org/10.1117/12.2677192

KEYWORDS: Multiplexing, Mechanical positioning systems, Dispersion, Telescopes, Mirrors, Thirty Meter Telescope, Spectroscopy, Prisms, Design and modelling, Tolerancing, Spectroscopic atmospheric monitoring techniques

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Proceedings Article | 30 August 2022 Presentation + Paper

Presentation + Paper

Towards the development of the Infrared Guide Star Catalogue for the adaptive optics observations by the Thirty Meter Telescope

Sarang Shah, Smitha Subramanian, G. Anupama, Francisco Delgado, Kim Gillies, Maheshwar Gopinathan, Rajalakshmi Narayanan, A. Ramaprakash, Suhasini Rao, B. Reddy, Warren Skidmore, T. Sivarani, Annapurni Subramaniam

Proceedings Volume 12185, 1218506 (2022) https://doi.org/10.1117/12.2629775

KEYWORDS: Near infrared, Stars, Atmospheric modeling, Adaptive optics, Thirty Meter Telescope, Data modeling, Infrared radiation, Photometry, Infrared telescopes, Telescopes

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Design of an IR imaging channel for the Keck Observatory SCALES instrument

Ravinder K. Banyal, Armirul Hasan, Reni Kupke, Hari Mohan Varshney, Ajin Prakaesh, T. Sivarani, Andy J. Skemer, Nick MacDonald, Steph Sallum, Will Deich, Michael P. Fitzgerald, K. V. Govinda, Chris Ratliff, Ramya Sethuram, Deno Stelter, Arun Surya, Eric Wang

Proceedings Volume 12188, 121881U (2022) https://doi.org/10.1117/12.2630696

KEYWORDS: Imaging systems, Sensors, Mirrors, Iterated function systems, Exoplanets, Image filtering, Computer aided design, Coronagraphy, Telescopes, Adaptive optics

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Design and development of WFOS, the Wide-Field Optical Spectrograph for the Thirty Meter Telescope

Charles Steidel, Eric Peng, Jason Fucik, Reston Nash, Stephen Kaye, George Jacoby, Bernard Delabre, Ramya Sethuram, Devika Divakar, Hari Mohan Varshney, Thirupathi Sivarani, Fumihiro Uraguchi, Shinobu Ozaki, Hangxin Ji, Tao LV, Kent Chiu, Qinfeng Zhu, David Andersen, John Miles, Davide Lasi

Proceedings Volume 12184, 1218423 (2022) https://doi.org/10.1117/12.2629464

KEYWORDS: Cameras, Telescopes, Sensors, Diffraction gratings, Spectrographs, Thirty Meter Telescope, Imaging systems, Mirrors, Collimators, Optical instrument design

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Design of SCALES: a 2-5 micron coronagraphic integral field spectrograph for Keck Observatory

Andrew Skemer, R. Deno Stelter, Stephanie Sallum, Nicholas MacDonald, Renate Kupke, Christopher Ratliff, Ravinder Banyal, Amirul Hasan, Hari Mohan Varshney, Arun Surya, Ajin Prakaesh, Sivarani Thirupathi, Ramya Sethuram, Govinda K.V., Michael Fitzgerald, Eric Wang, Marc Kassis, Olivier Absil, Carlos Alvarez, Natasha Batalha, Marc-André Boucher, Cyril Bourgenot, Timothy Brandt, Zackery Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Divakar, Guillaume Filion, Étienne Gauvin, Michael Gonzales, Thomas Greene, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Isabel Kain, Gabriel Kruglikov, Mackenzie Lach, Jean-Thomas Landry, Jialin Li, Michael Liu, James Lyke, Kenneth Magnone, Eduardo Marin, Emily Martin, Raquel Martinez, Dimitri Mawet, Brittany Miles, Dale Sandford, Patrick Sheehan, Ji Man Sohn, Jordan Stone

Proceedings Volume 12184, 121840I (2022) https://doi.org/10.1117/12.2630577

KEYWORDS: Exoplanets, Spectrographs, Planets, Sensors, Coronagraphy, Imaging systems, Adaptive optics, Mirrors, Spectroscopy

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Using a passively stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph

Tanya Das, Ravinder Banyal, T. Sivarani, S. Sriram

Proceedings Volume 11447, 1144748 (2020) https://doi.org/10.1117/12.2562007

KEYWORDS: Fabry–Perot interferometers, Spectrographs, Calibration, Doppler effect, Spectroscopes, Velocity measurements, Distortion, Stars, Instrument modeling, Telescopes

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Proceedings Article | 10 July 2018 Paper

Paper

Flexure compensation simulation tool for TMT-WFOS Spectrograph

Arun Surya, Matthew Radovan, Sivarani Thirupathi, S. Sriram, Devika Divakar, Jason Fucik

Proceedings Volume 10705, 107051G (2018) https://doi.org/10.1117/12.2312155

KEYWORDS: Optical components, Zemax, Spectrographs, Monte Carlo methods, Device simulation, Optical design, Spectroscopy

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Proceedings Article | 9 July 2018 Presentation

Presentation

WFOS instrument trade study: slicer vs. fiber instrument concept designs and results (Conference Presentation)

Kevin Bundy, Maureen Savage, Renate Kupke, Nicholas MacDonald, Kyle Westfall, Matthew Radovan, Zheng Cai, Brian Digiorgio, Richard Dekany, Devika Divakar, Jason Fucik, Hangxin Ji, Satoshi Miyazaki, Shinobu Ozaki, Andrew Phillips, Namrata Roy, Roger Smith, Arun Surya, S. Sriram, Sivarani Thirupathi, Toshihiro Tsuzuki

Proceedings Volume 10702, 1070220 (2018) https://doi.org/10.1117/12.2312283

KEYWORDS: Spectrographs, Thirty Meter Telescope, Multiplexing, Robotic systems, Spectroscopy, Astronomical imaging, Robotics, Fiber couplers, Telescopes

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Proceedings Article | 6 July 2018 Paper

Paper

Development of a stabilized Fabry-Perot based wavelength calibrator for precision Doppler spectroscopy

Tanya Das, Ravinder Banyal, S. Kathiravan, T. Sivarani, Ravindra B.

Proceedings Volume 10702, 107026A (2018) https://doi.org/10.1117/12.2312472

KEYWORDS: Fabry–Perot interferometers, Calibration, Spectrographs, Spectroscopy, Precision calibration

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Proceedings Article | 6 July 2018 Paper

Paper

Hanle echelle spectrograph: design and performance

S. Sriram, Amit Kumar, Arun Surya, T. Sivarani, Sunetra Giridhar, S. Kathiravan, M. N. Anand, Damien Jones, Deon Grobler, Robert Jakobsson, Anantha Chanumolu, Athira Unni, Angchuk Dorje, Tsewang Dorje, Tsewang Gyalson

Proceedings Volume 10702, 107026K (2018) https://doi.org/10.1117/12.2313165

KEYWORDS: Spectrographs, Calibration, Mirrors, Telescopes, Charge-coupled devices, Sensors

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Proceedings Article | 15 June 2015 Paper

Paper

Analytical modelling of Thirty Meter Telescope optics polarization

Ramya Anche, G. Anupama, Krishna Reddy, Asoke Sen, K. Sankarasubramanian, A. Ramaprakash, Sujan Sengupta, Warren Skidmore, Jenny Atwood, Sivarani Tirupathi, Shashi Bhushan Pandey

Proceedings Volume 9654, 965408 (2015) https://doi.org/10.1117/12.2181397

KEYWORDS: Mirrors, Polarization, Telescopes, Zemax, Modeling, Instrument modeling, Mueller matrices, Polarimetry, Coating, Thirty Meter Telescope

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Showing 5 of 24 publications

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