Zobrazeno 1 - 10
of 292
pro vyhledávání: '"CHUN, MARK"'
Autor:
Zhang, Ruihan, Baranec, Christoph, van Dam, Marcos A., Chun, Mark R., Riddle, Reed, Ou, James
Direct imaging of exoplanets allows us to measure positions and chemical signatures of exoplanets. Given the limited resources for space observations where the atmosphere is absent, we want to make these measurements from the ground. However, it is d
Externí odkaz:
http://arxiv.org/abs/2407.14677
Autor:
Zhang, Ruihan, Baeten, Max, Chun, Mark R., Lee, Ellen, Connelley, Michael, Lai, Olivier, Kuiper, Stefan, Ryan, Alan, Bos, Arjo, Bowens-Rubin, Rachel, Hinz, Philip M.
We performed closed-loop lab testing of large-format deformable mirrors (DMs) with hybrid variable reluctance actuators. TNO has been developing the hybrid variable reluctance actuators in support for a new generation of adaptive secondary mirrors (A
Externí odkaz:
http://arxiv.org/abs/2407.11289
Autor:
Lee, Ellen, Chun, Mark, Lai, Olivier, Zhang, Ruihan, Baeten, Max, Bos, Arjo, Kidron, Matias, Kamphues, Fred, Kuiper, Stefan, Jonker, Wouter, Connelley, Michael, Rayner, John, Ryan, Alan, Hinz, Philip, Bowens-Rubin, Rachel, Lockhart, Charles, Kelii, Michael
We are developing an adaptive secondary mirror (ASM) that uses a new actuator technology created by the Netherlands Organization for Applied Scientific Research (TNO). The TNO hybrid variable reluctance actuators have more than an order of magnitude
Externí odkaz:
http://arxiv.org/abs/2407.06444
Autor:
Baranec, Christoph, Ou, James, Riddle, Reed, Zhang, Ruihan, Mckay, Luke, Rampy, Rachel, Bonnet, Morgan, Hamilton, Iven, Ching, Greg, Young, Jessica, Salama, Maıssa, Barnes, Paul, Jacobson, Shane, Onaka, Peter, Chun, Mark, Werber, Zachary, Powell, Keith, van Dam, Marcos A., Shappee, Benjamin
We installed the next-generation automated laser adaptive optics system, Robo-AO-2, on the University of Hawaii 2.2-m telescope on Maunakea in 2023. We engineered Robo-AO-2 to deliver robotic, diffraction-limited observations at visible and near-infr
Externí odkaz:
http://arxiv.org/abs/2407.00582
Autor:
Christou, Julian, Chun, Mark, Dekany, Richard, Hinz, Philip, Lu, Jessica, Males, Jared, Wizinowich, Peter
In the recent Astro2020 Decadal Report, ''Pathways to Discovery in Astronomy and Astrophysics for the 2020s'' Adaptive Optics (AO) was identified as a crucial technology for a variety of reasons. These included an emphasis on high-contrast imaging an
Externí odkaz:
http://arxiv.org/abs/2402.06743
Autor:
Lai, Olivier, Chun, Mark, Kuiper, Stefan, Doelman, Niek, Carbillet, Marcel, N'Diaye, Mamadou, Martinache, Frantz, Abe, Lyu, Rivet, Jean-Pierre, Schmidt, Dirk
Adaptive optics is a technique mostly used on large telescopes. It turns out to be challenging for smaller telescopes (0.5~2m) due to the small isoplanatic angle, small subapertures and high correction speeds needed at visible wavelengths, requiring
Externí odkaz:
http://arxiv.org/abs/2310.07495
Autor:
Walk, Aidan, Claveau, Charles-Antoine, Bottom, Michael, Chun, Mark, Jacobson, Shane, Service, Maxwell, Lu, Jessica R.
Geometric optical distortion is a significant contributor to the astrometric error budget in large telescopes using adaptive optics. To increase astrometric precision, optical distortion calibration is necessary. We investigate using smartphone OLED
Externí odkaz:
http://arxiv.org/abs/2303.04961
Autor:
Dungee, Ryan, van Saders, Jennifer, Gaidos, Eric, Chun, Mark, Garcia, Rafael A., Magnier, Eugene A., Mathur, Savita, Santos, Angela R. G.
Publikováno v:
The Astrophysical Journal, Volume 938, Issue 2, id.118, 21 pp. (2022)
We present stellar rotation periods for late K- and early M-dwarf members of the 4 Gyr old open cluster M67 as calibrators for gyrochronology and tests of stellar spin-down models. Using Gaia EDR3 astrometry for cluster membership and Pan-STARRS (PS1
Externí odkaz:
http://arxiv.org/abs/2211.01377
Autor:
Xuan, Jerry W., Wang, Jason, Ruffio, Jean-Baptiste, Knutson, Heather, Mawet, Dimitri, Mollière, Paul, Kolecki, Jared, Vigan, Arthur, Mukherjee, Sagnick, Wallack, Nicole, Wang, Ji, Baker, Ashley, Bartos, Randall, Blake, Geoffrey A., Bond, Charlotte Z., Bryan, Marta, Calvin, Benjamin, Cetre, Sylvain, Chun, Mark, Delorme, Jacques-Robert, Doppmann, Greg, Echeverri, Daniel, Finnerty, Luke, Fitzgerald, Michael P., Horstman, Katelyn, Inglis, Julie, Jovanovic, Nemanja, López, Ronald, Martin, Emily, Morris, Evan, Pezzato, Jacklyn, Ragland, Sam, Ren, Bin, Ruane, Garreth, Sappey, Ben, Schofield, Tobias, Skemer, Andrew, Venenciano, Taylor, Wallace, J. Kent, Wizinowich, Peter
Direct imaging studies have mainly used low-resolution spectroscopy ($R\sim20-100$) to study the atmospheres of giant exoplanets and brown dwarf companions, but the presence of clouds has often led to degeneracies in the retrieved atmospheric abundan
Externí odkaz:
http://arxiv.org/abs/2208.01657
Autor:
Hinz, Philip M., Bowens-Rubin, Rachel, Baranec, Christoph, Bundy, Kevin, Chun, Mark, Dillon, Daren, Holden, Brad, Jonker, Wouter, Kosiarek, Molly, Kupke, Renate, Kuiper, Stefan, Lai, Olivier, Lu, Jessica R., Maniscalco, Matthew, Radovan, Matthew, Ragland, Sam, Sallum, Stephanie, Skemer, Andrew, Wizinowich, Peter
An Adaptive secondary mirror (ASM) allows for the integration of adaptive optics (AO) into the telescope itself. Adaptive secondary mirrors, based on hybrid variable reluctance (HVR) actuator technology, developed by TNO, provide a promising path to
Externí odkaz:
http://arxiv.org/abs/2110.01692