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31 results on '"Pahuja, Rishi"'

1. Innovations and advances in instrumentation at the W. M. Keck Observatory, vol. III

Author

Kassis, Marc F, Alvarez, Carlos, Baker, Ashley D, Bailey, John I, Banyal, Ravinder K, Bertz, Rob, Beichman, Charles A, Bouchez, Antonin H, Brown, Aaron M, Brown, Matthew K, Bundy, Kevin A, Campbell, Randall D, Chun, Mark R, Cooke, Jeffrey, Deich, William T, Dekany, Richard G, Doppmann, Greg, Fassnacht, Christopher, Ferrara, Jocelyn, Fitzgerald, Michael P, Fremling, Christoffer, Fucik, Jason R, Gibson, Steven R, Gillingham, Peter R, Glazebrook, Karl, Greffe, Timothee, Halverson, Samuel P, Hill, Grant M, Hillenbrand, Lynne, Hinz, Philip M, Holden, Bradford P, Howard, Andrew W, Huber, Daniel, Jones, Tucker A, Jordan, Carolyn, Jovanovic, Nemanja J, Kain, Isabel J, Kasliwal, Mansi M, Kirby, Evan, Konopacky, Quinn M, Krishnan, Shanti, Kulkarni, Shrinivas R, Kupke, Renate, Lanclos, Kyle, Larkin, James E, Lilley, Scott J, Lingvay, Larry, Lu, Jessica R, Lyke, James E, MacDonald, Nicholas, Martin, Christopher, Mather, John C, Matuszewski, Mateusz, Mawet, Dimitri P, McGurk, Rosalie C, Marin, Eduardo, Meeks, Robert L, Millar-Blanchaer, Maxwell A, Nash, Reston B, Neill, James D, O'Meara, John M, Pahuja, Rishi, Peretz, Eliad, Prusinski, Nikolaus, Radovan, Matthew V, Rider, Kodi A, Roberts, Mitsuko K, Rockosi, Constance M, Rubenzahl, Ryan, Sallum, Stephanie E, Sandford, Dale, Savage, Maureen L, Skemer, Andrew J, Smith, Roger, Steidel, Charles, Steiner, Jonathan, Stelter, Richard D, Walawender, Josh, Westfall, Kyle B, Wizinowich, Peter L, Wright, Shelley A, Wold, Truman, and Zimmer, Jake

Published
2024

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

Author

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

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

HISPEC is a new, high-resolution near-infrared spectrograph being designed for the W.M. Keck II telescope. By offering single-shot, R=100,000 between 0.98 - 2.5 um, HISPEC will enable spectroscopy of transiting and non-transiting exoplanets in close orbits, direct high-contrast detection and spectroscopy of spatially separated substellar companions, and exoplanet dynamical mass and orbit measurements using precision radial velocity monitoring calibrated with a suite of state-of-the-art absolute and relative wavelength references. MODHIS is the counterpart to HISPEC for the Thirty Meter Telescope and is being developed in parallel with similar scientific goals. In this proceeding, we provide a brief overview of the current design of both instruments, and the requirements for the two spectrographs as guided by the scientific goals for each. We then outline the current science case for HISPEC and MODHIS, with focuses on the science enabled for exoplanet discovery and characterization. We also provide updated sensitivity curves for both instruments, in terms of both signal-to-noise ratio and predicted radial velocity precision., Comment: 25 pages, 9 figures. To appear in the Proceedings of SPIE: Techniques and Instrumentation for Detection of Exoplanets XI, vol. 12680 (2023)

Published
2023

3. Initial Fabrication and Characterization of Chemically-Etched Silicon Slits for KOSMOS

Author

Tran, Debby, Tuttle, Sarah, Kadlec, Kal, Pahuja, Rishi, Jones, Ali C., Ketzeback, William, McMillan, Russet, and Townsend, Amanda

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

KOSMOS is a low-resolution, long-slit, optical spectrograph that has been upgraded at the University of Washington for its move from Kitt Peak National Observatory's Mayall 4m telescope to the Apache Point Observatory's ARC 3.5m telescope. One of the additions to KOSMOS is a slitviewer, which requires the fabrication of reflective slits, as KOSMOS previously used matte slits machined via wire EDM. We explore a novel method of slit fabrication using nanofabrication methods and compare the slit edge roughness, width uniformity, and the resulting scattering of the new fabricated slits to the original slits. We find the kerf surface of the chemically-etched reflective silicon slits are generally smoother than the machined matte slits, with an upper limit average roughness of 0.42 $\pm$ 0.03 $\mu$m versus 1.06 $\pm$ 0.04 $\mu$m respectively. The etched slits have width standard deviations of 6 $\pm$ 3 $\mu$m versus 10 $\pm$ 6 $\mu$m, respectively. The scattering for the chemically-etched slits is higher than that of the machined slits, showing that the reflectivity is the major contributor to scattering, not the roughness. This scattering, however, can be effectively reduced to zero with proper background subtraction. As slit widths increase, scattering increases for both types of slits, as expected. Future work will consist of testing and comparing the throughput and spectrophotometric data quality of these nanofabricated slits to the machined slits with on-sky data, in addition to making the etched slits more robust against breakage and finalizing the slit manufacturing process., Comment: 36 pages, 12 figures, accepted by SPIE

Published
2023
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9. Fiber-fed high-resolution infrared spectroscopy at the diffraction limit with Keck-HISPEC and TMT-MODHIS: status update

Author

Bryant, Julia J., Motohara, Kentaro, Vernet, Joël R. D., Mawet, Dimitri, Fitzgerald, Michael P., Konopacky, Quinn, Jovanovic, Nemanja, Baker, Ashley, Andersen, David, Artigau, Etienne, Bailey, John I., Beichman, Charles, Benneke, Björn, Bertz, Rob, Betters, Christopher, Brearly, David, Brown, Aaron, Brugger, James, Dekany, Richard, Ferrara, Jocelyn, Franco, Alberto, Fucik, Jason, Gibson, Rose, Greffe, Tim, Halverson, Samuel, Johnson, Christopher, Kassis, Marc F., Kotani, Takayuki, Kim, Yoo Jung, Leifer, Stephanie, Leon-Saval, Sergio, Lin, Jonathan, Lingvay, Larry, Maire, Jerome, Marin, Eduardo, Magnone, Kenneth, Neill, Don, Pahuja, Rishi, Ruane, Garreth, Sercel, Greg, Soda, Svarun, Sohn, Ji Man, Steiner, Jonathan, Tamura, Motohide, Thorne, Jim, Wang, Eric, Wold, Truman, and Zarzaca, Ray

Published
2024
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13. SIGHT: the Palomar 5m telescope LGS AO system maximizing visible-light spectroscopic sensitivity

Author

Dekany, Richard G., primary, Roberts, Mitsuko K., additional, Fahey, Lauren, additional, Riddle, Reed, additional, McKenna, Daniel L., additional, Haffert, Sebastiaan Y., additional, Delacroix, Alexandre, additional, Pahuja, Rishi, additional, Zolkower, Jeffry N., additional, Burruss, Rick S., additional, Hovanec, Julian, additional, and Baranec, Christoph, additional

Published
2022
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15. Fiber-fed high-resolution infrared spectroscopy at the diffraction limit with Keck-HISPEC and TMT-MODHIS: status update

Author

Mawet, Dimitri ., primary, Fitzgerald, Michael P., additional, Konopacky, Quinn, additional, Jovanovic, Nemanja, additional, Baker, Ashley, additional, Beichman, Charles, additional, Bertz, Rob, additional, Dekany, Richard, additional, Fucik, Jason, additional, Roberts, Mitsuko, additional, Porter, Michael, additional, Pahuja, Rishi, additional, Ruane, Garreth, additional, Leifer, Stephanie D., additional, Halverson, Samuel P., additional, Gibbs, Aidan, additional, Johnson, Chris, additional, Kress, Evan, additional, Magnone, Kenneth, additional, Sohn, Ji Man, additional, Wang, Eric, additional, Brown, Aaron, additional, Maire, Jerome, additional, Sappey, Ben, additional, Andersen, David, additional, Terada, Hiroshi, additional, Kassis, Marc, additional, Artigau, Etienne, additional, Benneke, Bjorn, additional, Doyon, René, additional, Kotani, Takayuki, additional, Tamura, Motohide, additional, Beatty, Thomas, additional, Plavchan, Peter, additional, Do, Tuan, additional, Nishiyama, Shogo, additional, Wang, Jason, additional, and Wang, Ji, additional

Published
2022
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20. Fiber-fed high-resolution infrared spectroscopy at the diffraction limit with Keck-HISPEC and TMT-MODHIS: status update

Author

Evans, Christopher J., Bryant, Julia J., Motohara, Kentaro, Mawet, Dimitri, Fitzgerald, Michael P., Konopacky, Quinn, Jovanovic, Nemanja, Baker, Ashley, Beichman, Charles, Bertz, Rob, Dekany, Richard, Fucik, Jason, Roberts, Mitsuko, Porter, Michael, Pahuja, Rishi, Ruane, Garreth, Leifer, Stephanie, Halverson, Samuel, Gibbs, Aidan, Johnson, Chris, Kress, Evan, Magnone, Kenneth, Sohn, Ji Man, Wang, Eric, Brown, Aaron, Maire, Jerome, Sappey, Ben, Andersen, David, Terada, Hiroshi, Kassis, Marc, Artigau, Etienne, Benneke, Bjorn, Doyon, Rene, Kotani, Takayuki, Tamura, Motohide, Beatty, Thomas, Plavchan, Peter, Do, Tuan, Nishiyama, Shogo, Wang, Jason, and Wang, Ji

Published
2022
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22. KOSMOS II: updating a spectrograph for the Apache Point Observatory ARC 3.5m telescope

Author

Bryant, Julia J., Motohara, Kentaro, Vernet, Joël R. D., Kadlec, Kal, Tuttle, Sarah E., Pahuja, Rishi, Tran, Debby, Sayres, Conor, Sánchez-Gallego, José, Davenport, James, Ketzeback, William, Leon, Ed, McMillan, Russet, DeColibus, Riley, Dembicky, Jack, Gray, Candace, Townsend, Amanda, Thomas, Shane, Eriksen, Jamey, Fernandez, Tracey, Wilson, John C., and Chanover, Nancy

Published
2024
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23. Innovations and advances in instrumentation at the W. M. Keck Observatory, vol. III

Author

Bryant, Julia J., Motohara, Kentaro, Vernet, Joël R. D., Kassis, Marc, Alvarez, Carlos, Baker, Ashley, Bailey, Jeb, Banyal, Ravinder K., Bertz, Robert, Beichman, Charles, Bouchez, Antonin, Brown, Aaron, Brown, Matthew, Bundy, Kevin, Campbell, Randall, Chun, Mark R., Cooke, Jeff, Deich, William, Dekany, Richard G., Doppmann, Greg, Fassnacht, Christopher, Ferrara, Jocelyn, Fitzgerald, Michael P., Fremling, Christoffer, Fucik, Jason R., Gibson, Steven R., Gillingham, Peter R., Glazebrook, Karl, Greffe, Timothee, Halverson, Samuel, Hill, Grant, Hillenbrand, Lynne, Hinz, Philip, Holden, Bradford P., Howard, Andrew W., Huber, Daniel, Jones, Tucker, Jordan, Carolyn, Jovanovic, Nemanja, Kain, Isabell, Kasliwal, Mansi, Kirby, Evan, Konopacky, Quinn, Krishnan, Shanti, Kulkarni, Shri, Kupke, Renate, Lanclos, Kyle, Larkin, James E., Lilley, Scott, Lingvay, Larry, Lu, Jessica R., Lyke, James E., MacDonald, Nicholas, Martin, Christopher, Mather, John, Matuszewski, Mateusz, Mawet, Dimitri, McGurk, Rosalie, Marin, Eduardo, Meeks, Bob, Millar-Blanchaer, Maxwell A., Nash, Reston B., Neill, James D., O'Meara, John M., Pahuja, Rishi, Peretz, Eliad, Prusinski, Nikolaus, Radovan, Matthew V., Rider, Kodi, Roberts, Mitsuko, Rockosi, Connie, Rubenzahl, Ryan, Sallum, Stephanie, Sandford, Dale, Savage, Maureen, Skemer, Andy J., Smith, Roger, Steidel, Charles C., Steiner, Jonathan, Stelter, Deno, Walawender, Josh, Westfall, Kyle B., Wizinowich, Peter, Wright, Shelley, Wold, Truman, and Zimmer, Jake H.

Published
2024
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26. MACHINABILITY OF Ti/CFRP STACKS IN TRIMMING AND DRILLING USING ABRASIVE WATERJET.

Author

Pahuja, Rishi and Mamidala, Ramulu

Subjects
CARBON fiber-reinforced plastics, WATER jets, CUTTING (Materials), DRILLING machines (Manufacturing), METALLIC composites
Abstract

CFRP and Ti6Al4V are one of the primary candidates as metal-composite stacks in aerospace industry, often joined by riveting process and require precisely machined holes. Conventional machining of composite-metal stacks is a challenging problem. This study investigates the machinability of Ti6Al4V/CFRP stacks using Abrasive waterjet technology for trimming and drilling (piercing) holes. The machining characteristics are studied as a function of process parameters - traverse feed, and water pressure. The machinability is evaluated in terms of macrofeatures - kerf wall characteristics such as kerf geometry and hole cylindricity. The influence of inhomogeneity seen by the jet was studied, as reflected in the machining characteristics. The machining forces during piercing were recorded characterized and correlated with the process parameters. The nexus between the process parameters, material, kerf quality and piercing forces was established, to determine a processing window in successful machining of Ti6Al4V/CFRP stacks. [ABSTRACT FROM AUTHOR]

Published
2017

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

Author

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

Published
2023
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30. Fiber-fed high-resolution infrared spectroscopy at the diffraction limit with Keck-HISPEC and TMT-MODHIS: status update.

Author

Mawet, Dimitri, Fitzgerald, Michael P., Konopacky, Quinn, Jovanovic, Nemanja, Baker, Ashley, Beichman, Charles, Bertz, Rob, Dekany, Richard, Fucik, Jason, Roberts, Mitsuko, Porter, Michael, Pahuja, Rishi, Ruane, Garreth, Leifer, Stephanie, Halverson, Samuel, Gibbs, Aidan, Johnson, Chris, Kress, Evan, Magnone, Kenneth, and Sohn, Ji Man

Published
2022
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