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66 results on '"Friedman, Andrew S."'

51. SN 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION

Author

Marion, G. H., primary, Brown, Peter J., additional, Vinkó, Jozsef, additional, Silverman, Jeffrey M., additional, Sand, David J., additional, Challis, Peter, additional, Kirshner, Robert P., additional, Wheeler, J. Craig, additional, Berlind, Perry, additional, Brown, Warren R., additional, Calkins, Michael L., additional, Camacho, Yssavo, additional, Dhungana, Govinda, additional, Foley, Ryan J., additional, Friedman, Andrew S., additional, Graham, Melissa L., additional, Howell, D. Andrew, additional, Hsiao, Eric Y., additional, Irwin, Jonathan M., additional, Jha, Saurabh W., additional, Kehoe, Robert, additional, Macri, Lucas M., additional, Maeda, Keiichi, additional, Mandel, Kaisey, additional, McCully, Curtis, additional, Pandya, Viraj, additional, Rines, Kenneth J., additional, Wilhelmy, Steven, additional, and Zheng, Weikang, additional

Published
2016
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52. CfAIR2: NEAR-INFRARED LIGHT CURVES OF 94 TYPE Ia SUPERNOVAE

Author

Friedman, Andrew S., primary, Wood-Vasey, W. M., additional, Marion, G. H., additional, Challis, Peter, additional, Mandel, Kaisey S., additional, Bloom, Joshua S., additional, Modjaz, Maryam, additional, Narayan, Gautham, additional, Hicken, Malcolm, additional, Foley, Ryan J., additional, Klein, Christopher R., additional, Starr, Dan L., additional, Morgan, Adam, additional, Rest, Armin, additional, Blake, Cullen H., additional, Miller, Adam A., additional, Falco, Emilio E., additional, Wyatt, William F., additional, Mink, Jessica, additional, Skrutskie, Michael F., additional, and Kirshner, Robert P., additional

Published
2015
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55. High-density circumstellar interaction in the luminous type IIn SN 2010jl : The first 1100 days

Author

Fransson, Claes, Ergon, Mattias, Challis, Peter J., Chevalier, Roger A., France, Kevin, Kirshner, Robert P., Marion, G. H., Milisavljevic, Dan, Smith, Nathan, Bufano, Filomena, Friedman, Andrew S., Kangas, Tuomas, Larsson, Josefin, Mattila, Seppo, Benetti, Stefano, Chornock, Ryan, Czekala, Ian, Soderberg, Alicia, Sollerman, Jesper, Fransson, Claes, Ergon, Mattias, Challis, Peter J., Chevalier, Roger A., France, Kevin, Kirshner, Robert P., Marion, G. H., Milisavljevic, Dan, Smith, Nathan, Bufano, Filomena, Friedman, Andrew S., Kangas, Tuomas, Larsson, Josefin, Mattila, Seppo, Benetti, Stefano, Chornock, Ryan, Czekala, Ian, Soderberg, Alicia, and Sollerman, Jesper

Abstract

Hubble Space Telescope and ground-based observations of the Type IIn supernova (SN) 2010jl are analyzed, including photometry and spectroscopy in the ultraviolet, optical, and near-IR bands, 26-1128 days after first detection. At maximum, the bolometric luminosity was similar to 3 x 10(43) erg s(-1) and even at 850 days exceeds 10(42) erg s(-1). A near-IR excess, dominating after 400 days, probably originates in dust in the circumstellar medium (CSM). The total radiated energy is greater than or similar to 6.5x10(50) erg, excluding the dust component. The spectral lines can be separated into one broad component that is due to electron scattering and one narrow with expansion velocity similar to 100 km s(-1) from the CSM. The broad component is initially symmetric around zero velocity but becomes blueshifted after similar to 50 days, while remaining symmetric about a shifted centroid velocity. Dust absorption in the ejecta is unlikely to explain the line shifts, and we attribute the shift instead to acceleration by the SN radiation. From the optical lines and the X-ray and dust properties, there is strong evidence for large-scale asymmetries in the CSM. The ultraviolet lines indicate CNO processing in the progenitor, while the optical shows a number of narrow coronal lines excited by the X-rays. The bolometric light curve is consistent with a radiative shock in an r(-2) CSM with a mass-loss rate of M similar to 0.1 M(circle dot)yr(-1). The total mass lost is greater than or similar to 3 M-circle dot. These properties are consistent with the SN expanding into a CSM characteristic of a luminous blue variable progenitor with a bipolar geometry. The apparent absence of nuclear processing is attributed to a CSM that is still opaque to electron scattering., QC 20150304

Published
2014
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56. TYPE IIb SUPERNOVA SN 2011dh : SPECTRA AND PHOTOMETRY FROM THE ULTRAVIOLET TO THE NEAR-INFRARED

Author

Marion, G. H., Vinko, Jozsef, Kirshner, Robert P., Foley, Ryan J., Berlind, Perry, Bieryla, Allyson, Bloom, Joshua S., Calkins, Michael L., Challis, Peter, Chevalier, Roger A., Chornock, Ryan, Culliton, Chris, Curtis, Jason L., Esquerdo, Gilbert A., Everett, Mark E., Falco, Emilio E., France, Kevin, Fransson, Claes, Friedman, Andrew S., Garnavich, Peter, Leibundgut, Bruno, Meyer, Samuel, Smith, Nathan, Söderberg, Alicia M., Sollerman, Jesper, Starr, Dan L., Szklenar, Tamas, Takats, Katalin, Wheeler, J. Craig, Marion, G. H., Vinko, Jozsef, Kirshner, Robert P., Foley, Ryan J., Berlind, Perry, Bieryla, Allyson, Bloom, Joshua S., Calkins, Michael L., Challis, Peter, Chevalier, Roger A., Chornock, Ryan, Culliton, Chris, Curtis, Jason L., Esquerdo, Gilbert A., Everett, Mark E., Falco, Emilio E., France, Kevin, Fransson, Claes, Friedman, Andrew S., Garnavich, Peter, Leibundgut, Bruno, Meyer, Samuel, Smith, Nathan, Söderberg, Alicia M., Sollerman, Jesper, Starr, Dan L., Szklenar, Tamas, Takats, Katalin, and Wheeler, J. Craig

Abstract

We report spectroscopic and photometric observations of the Type IIb SN 201 ldh obtained between 4 and 34 days after the estimated date of explosion (May 31.5 UT). The data cover a wide wavelength range from 2000 angstrom in the ultraviolet (UV) to 2.4 mu m in the near-infrared (NIR). Optical spectra provide line profiles and velocity measurements of H I, He I, Call, and Fe It that trace the composition and kinematics of the supernova (SN). NIR spectra show that helium is present in the atmosphere as early as 11 days after the explosion. A UV spectrum obtained with the Space Telescope Imaging Spectrograph reveals that the UV flux for SN 2011dh is low compared to other SN IIb. Modeling the spectrum with SYNOW suggests that the UV deficit is due to line blanketing from TinH and Co II. The HI and He I velocities in SN 2011dh are separated by about 4000 km s(-1) at all phases. A velocity gap is consistent with models for a preexplosion structure in which a hydrogen-rich shell surrounds the progenitor. We estimate that the H shell of SN 2011dh is approximate to 8 times less massive than the shell of SN 1993J and approximate to 3 times more massive than the shell of SN 2008ax. Light curves (LCs) for 12 passbands are presented: UVW2, UVM2, UVW1, U, u', B, V, r', i', J, H, and Ks. In the B band, SN 2011dh reached peak brightness of 13.17 mag at 20.0 +/- 0.5 after the explosion. The maximum bolometric luminosity of 1.8 +/- 0.2 x 10(42) erg s(-1) occurred approximate to 22 days after the explosion. NIR emission provides more than 30% of the total bolometric flux at the beginning of our observations, and the NIR contribution increases to nearly 50% of the total by day 34. The UV produces 16% of the total flux on day 4, 5% on day 9, and 1% on day 34. We compare the bolometric LCs of SN 2011dh, SN 2008ax, and SN 1993J. The LC are very different for the first 12 days after the explosions, but all three SN IIb display similar peak luminosities, times of peak, decline rates, and co, AuthorCount:29

Published
2014
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57. HIGH-DENSITY CIRCUMSTELLAR INTERACTION IN THE LUMINOUS TYPE IIn SN 2010jl: THE FIRST 1100 DAYS

Author

Fransson, Claes, primary, Ergon, Mattias, additional, Challis, Peter J., additional, Chevalier, Roger A., additional, France, Kevin, additional, Kirshner, Robert P., additional, Marion, G. H., additional, Milisavljevic, Dan, additional, Smith, Nathan, additional, Bufano, Filomena, additional, Friedman, Andrew S., additional, Kangas, Tuomas, additional, Larsson, Josefin, additional, Mattila, Seppo, additional, Benetti, Stefano, additional, Chornock, Ryan, additional, Czekala, Ian, additional, Soderberg, Alicia, additional, and Sollerman, Jesper, additional

Published
2014
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59. TYPE IIb SUPERNOVA SN 2011dh: SPECTRA AND PHOTOMETRY FROM THE ULTRAVIOLET TO THE NEAR-INFRARED

Author

Marion, G. H., primary, Vinko, Jozsef, additional, Kirshner, Robert P., additional, Foley, Ryan J., additional, Berlind, Perry, additional, Bieryla, Allyson, additional, Bloom, Joshua S., additional, Calkins, Michael L., additional, Challis, Peter, additional, Chevalier, Roger A., additional, Chornock, Ryan, additional, Culliton, Chris, additional, Curtis, Jason L., additional, Esquerdo, Gilbert A., additional, Everett, Mark E., additional, Falco, Emilio E., additional, France, Kevin, additional, Fransson, Claes, additional, Friedman, Andrew S., additional, Garnavich, Peter, additional, Leibundgut, Bruno, additional, Meyer, Samuel, additional, Smith, Nathan, additional, Soderberg, Alicia M., additional, Sollerman, Jesper, additional, Starr, Dan L., additional, Szklenar, Tamas, additional, Takats, Katalin, additional, and Wheeler, J. Craig, additional

Published
2014
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61. CfA4: LIGHT CURVES FOR 94 TYPE Ia SUPERNOVAE

Author

Hicken, Malcolm, primary, Challis, Peter, additional, Kirshner, Robert P., additional, Rest, Armin, additional, Cramer, Claire E., additional, Wood-Vasey, W. Michael, additional, Bakos, Gaspar, additional, Berlind, Perry, additional, Brown, Warren R., additional, Caldwell, Nelson, additional, Calkins, Mike, additional, Currie, Thayne, additional, de Kleer, Kathy, additional, Esquerdo, Gil, additional, Everett, Mark, additional, Falco, Emilio, additional, Fernandez, Jose, additional, Friedman, Andrew S., additional, Groner, Ted, additional, Hartman, Joel, additional, Holman, Matthew J., additional, Hutchins, Robert, additional, Keys, Sonia, additional, Kipping, David, additional, Latham, Dave, additional, Marion, George H., additional, Narayan, Gautham, additional, Pahre, Michael, additional, Pal, Andras, additional, Peters, Wayne, additional, Perumpilly, Gopakumar, additional, Ripman, Ben, additional, Sipocz, Brigitta, additional, Szentgyorgyi, Andrew, additional, Tang, Sumin, additional, Torres, Manuel A. P., additional, Vaz, Amali, additional, Wolk, Scott, additional, and Zezas, Andreas, additional

Published
2012
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64. SN 2008ha: AN EXTREMELY LOW LUMINOSITY AND EXCEPTIONALLY LOW ENERGY SUPERNOVA

Author

Foley, Ryan J., primary, Chornock, Ryan, additional, Filippenko, Alexei V., additional, Ganeshalingam, Mohan, additional, Kirshner, Robert P., additional, Li, Weidong, additional, Cenko, S. Bradley, additional, Challis, Peter J., additional, Friedman, Andrew S., additional, Modjaz, Maryam, additional, Silverman, Jeffrey M., additional, and Wood-Vasey, W. Michael, additional

Published
2009
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65. Type Ia Supernovae Are Good Standard Candles in the Near Infrared: Evidence from PAIRITEL

Author

Wood‐Vasey, W. Michael, primary, Friedman, Andrew S., additional, Bloom, Joshua S., additional, Hicken, Malcolm, additional, Modjaz, Maryam, additional, Kirshner, Robert P., additional, Starr, Dan L., additional, Blake, Cullen H., additional, Falco, Emilio E., additional, Szentgyorgyi, Andrew H., additional, Challis, Peter, additional, Blondin, Stéphane, additional, Mandel, Kaisey S., additional, and Rest, Armin, additional

Published
2008
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