Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Shreyas Vissapragada"'
Autor:
Kimberly Paragas, Michael Greklek-McKeon, Yayaati Chachan, Antonija Oklopčić, Shreyas Vissapragada, Samaporn Tinyanont, Gautam Vasisht, Fei Dai, Heather A. Knutson
Publikováno v:
Astrophysical Journal Letters, 909(1):L10. IOP Publishing Ltd.
The metastable helium line at 1083 nm can be used to probe the extended upper atmospheres of close-in exoplanets and thus provide insight into their atmospheric mass loss, which is likely to be significant in sculpting their population. We used an ul
Long period comet C/2021 A1 (Leonard) will approach Venus to within 0.029 au on 2021 December 18 and may subsequently graze the planet with its dust trail less than two days later. We observed C/2021 A1 with the Lowell Discovery Telescope on 2021 Jan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ec851fe7e52323c38ab7f8ab6f136ed
Autor:
Jessica Spake, Suvrath Mahadevan, Christian Schwab, Yayaati Chachan, Joe P. Ninan, Gudmundur Stefansson, John Wisniewski, Caroline V. Morley, Andrew J. Metcalf, Fei Dai, Adam F. Kowalski, Samuel Halverson, Trevor J. David, Lawrence W. Ramsey, Marissa Maney, William D. Cochran, Gautam Vasisht, Arpita Roy, Michael Greklek-McKeon, Ryan Terrien, Shreyas Vissapragada, Caleb I. Cañas, Heather A. Knutson, Karen A. Collins, Leslie Hebb, Suzanne L. Hawley, Samaporn Tinyanont, Paul Robertson, Antonija Oklopčić, John H. Livingston, Shubham Kanodia
Publikováno v:
The Astronomical Journal, 162(5):222. IOP Publishing Ltd.
Early in their lives, planets endure extreme amounts of ionizing radiation from their host stars. For planets with primordial hydrogen and helium-rich envelopes, this can lead to substantial mass loss. Direct observations of atmospheric escape in you
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9ae949c7c076098954ceb0e5c8191f4
Autor:
Nemanja Jovanovic, Samaporn Tinyanont, Dimitri Mawet, Caleb K. Harada, Shreyas Vissapragada, James Eriksen, Maxwell A. Millar-Blanchaer, Heather Knutson, Gautam Vasisht, Antonija Oklopčić
Infrared observations of metastable 2$^3$S helium absorption with ground- and space-based spectroscopy are rapidly maturing, as this species is a unique probe of exoplanet atmospheres. Specifically, the transit depth in the triplet feature (with vacu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02915f71dc062e76c0fc824ce8f4d79e
Autor:
Shreyas Vissapragada, Anthony L. Piro
An intriguing, growing class of planets are the "super-puffs," objects with exceptionally large radii for their masses and thus correspondingly low densities ($\lesssim0.3\rm\,g\,cm^{-3}$). Here we consider whether they could have large inferred radi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::33a94e16a335c84b0f4506ac9e47ba71
Gas-phase methanol was recently detected in a protoplanetary disk for the first time with ALMA. The peak abundance and distribution of methanol observed in TW Hya differed from that predicted by chemical models. Here, the chemistry of methanol gas an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2dab8a8a1c8026c34b63e0ecb45588d0
https://eprints.whiterose.ac.uk/130369/1/1710.01219v1.pdf
https://eprints.whiterose.ac.uk/130369/1/1710.01219v1.pdf
Autor:
Daniel Thorngren, Jason T. Wright, Leo Y. Liu, Gautam Vasisht, Heather Knutson, Shreyas Vissapragada, Maxwell A. Millar-Blanchaer, Dimitri Mawet, Daniel Jontof-Hutter, Avi Shporer, Eve J. Lee, Yayaati Chachan, Samaporn Tinyanont, Ricky Nilsson
Publikováno v:
The Astronomical Journal. 159:108
We present ground-based infrared transit observations for four dynamically interacting \textit{Kepler} planets, including Kepler-29b, Kepler-36c, KOI-1783.01, and Kepler-177c, obtained using the Wide-field Infrared Camera on the Hale 200" telescope a
Autor:
Michael Zhang, Matthew J. Holman, Heather A. Knutson, Kishore C. Patra, Shreyas Vissapragada, Samuel W. Yee, Avi Shporer, Jason T. Wright, Joshua N. Winn
Publikováno v:
The Astrophysical Journal. 888:L5
WASP-12b is a transiting hot Jupiter on a 1.09-day orbit around a late-F star. Since the planet's discovery in 2008, the time interval between transits has been decreasing by $29\pm 2$ msec year$^{-1}$. This is a possible sign of orbital decay, altho
Autor:
Niels F. W. Ligterink, Catherine Walsh, Harold Linnartz, J. Terwisscha van Scheltinga, Radha Gobinda Bhuin, Shreyas Vissapragada
Publikováno v:
Astronomy and Astrophysics, 612, A88
Methanol is formed via surface reactions on icy dust grains. Methanol is also detected in the gas-phase at temperatures below its thermal desorption temperature and at levels higher than can be explained by pure gas-phase chemistry. The process that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b143f0dc82c5525710cb52185d24c073
http://arxiv.org/abs/1801.04846
http://arxiv.org/abs/1801.04846
Autor:
Jason Kekas, Tiffany Kataria, Louis D. Santos, Ricky Nilsson, Maxwell A. Millar-Blanchaer, Shreyas Vissapragada, David Hale, Keith Matthews, Gautam Vasisht, Charles Henderson, Jennifer Milburn, Roger Smith, Dimitri Mawet, Eugene Serabyn, Heather A. Knutson, Samaporn Tinyanont, Michael J. Escuti
Publikováno v:
Publications of the Astronomical Society of the Pacific. 131:025001
WIRC+Pol is a newly commissioned low-resolution (R~100), near-infrared (J and H band) spectropolarimetry mode of the Wide-field InfraRed Camera (WIRC) on the 200-inch Hale Telescope at Palomar Observatory. The instrument utilizes a novel polarimeter