Browsing by Author "Prieto, JL"

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    Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye
    (2020) Wyrzykowski, L; Mroz, P; Rybicki, KA; Gromadzki, M; Kolaczkowski, Z; Zielinski, M; Zielinski, P; Britavskiy, N; Gomboc, A; Sokolovsky, K; Hodgkin, ST; Abe, L; Aldi, GF; AlMannaei, A; Altavilla, G; Al Qasim, A; Anupama, GC; Awiphan, S; Bachelet, E; Bakis, V; Baker, S; Bartlett, S; Bendjoya, P; Benson, K; Bikmaev, IF; Birenbaum, G; Blagorodnova, N; Blanco-Cuaresma, S; Boeva, S; Bonanos, AZ; Bozza, V; Bramich, DM; Bruni, I; Burenin, RA; Burgaz, U; Butterley, T; Caines, HE; Caton, DB; Novati, SC; Carrasco, JM; Cassan, A; Cepas, V; Cropper, M; Chruslinska, M; Clementini, G; Clerici, A; Conti, D; Conti, M; Cross, S; Cusano, F; Damljanovic, G; Dapergolas, A; D'Ago, G; de Bruijne, JHJ; Dennefeld, M; Dhillon, VS; Dominik, M; Dziedzic, J; Erece, O; Eselevich, MV; Esenoglu, H; Eyer, L; Jaimes, RF; Fossey, SJ; Galeev, AI; Grebenev, SA; Gupta, AC; Gutaev, AG; Hallakoun, N; Hamanowicz, A; Han, C; Handzlik, B; Haislip, JB; Hanlon, L; Hardy, LK; Harrison, DL; van Heerden, HJ; Hoette, VL; Horne, K; Hudec, R; Hundertmark, M; Ihanec, N; Irtuganov, EN; Itoh, R; Iwanek, P; Jovanovic, MD; Janulis, R; Jelinek, M; Jensen, E; Kaczmarek, Z; Katz, D; Khamitov, IM; Kilic, Y; Klencki, J; Kolb, U; Kopacki, G; Kouprianov, VV; Kruszynska, K; Kurowski, S; Latev, G; Lee, CH; Leonini, S; Leto, G; Lewis, F; Li, Z; Liakos, A; Littlefair, SP; Lu, J; Manser, CJ; Mao, S; Maoz, D; Martin-Carrillo, A; Marais, JP; Maskoliunas, M; Maund, JR; Meintjes, PJ; Melnikov, SS; Ment, K; Mikolajczyk, P; Morrell, M; Mowlavi, N; Mozdzierski, D; Murphy, D; Nazarov, S; Netzel, H; Nesci, R; Ngeow, CC; Norton, AJ; Ofek, EO; Pakstiene, E; Palaversa, L; Pandey, A; Paraskeva, E; Pawlak, M; Penny, MT; Penprase, BE; Piascik, A; Prieto, JL; Qvam, JKT; Ranc, C; Rebassa-Mansergas, A; Reichart, DE; Reig, P; Rhodes, L; Rivet, JP; Rixon, G; Roberts, D; Rosi, P; Russell, DM; Sanchez, RZ; Scarpetta, G; Seabroke, G; Shappee, BJ; Schmidt, R; Shvartzvald, Y; Sitek, M; Skowron, J; Sniegowska, M; Snodgrass, C; Soares, PS; van Soelen, B; Spetsieri, ZT; Stankeviciute, A; Steele, IA; Street, RA; Strobl, J; Strubble, E; Szegedi, H; Ramirez, LMT; Tomasella, L; Tsapras, Y; Vernet, D; Villanueva, S; Vince, O; Wambsganss, J; van der Westhuizen, IP; Wiersema, K; Wium, D; Wilson, RW; Yoldas, A; Zhuchkov, RY; Zhukov, DG; Zdanavicius, J; Zola, S; Zubareva, A
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    Hubble Space Telescope and ground-based observations of Type Ia supernovae at redshift 0.5
    (2006) Clocchiatti, A; Schmidt, BP; Filippenko, AV; Challis, P; Coil, AL; Covarrubias, R; Diercks, A; Garnavich, P; Germany, L; Gilliland, R; Hogan, C; Jha, S; Kirshner, RP; Leibundgut, B; Leonard, D; Li, WD; Matheson, T; Phillips, MM; Prieto, JL; Reiss, D; Riess, AG; Schommer, R; Smith, RC; Soderberg, A; Spyromilio, J; Stubbs, C; Suntzeff, NB; Tonry, JL; Woudt, P
    We present observations of the Type Ia supernovae (SNe) 1999M, 1999N, 1999Q, 1999S, and 1999U, at redshift z approximate to 0.5. They were discovered in early 1999 with the 4.0m Blanco telescope at Cerro Tololo Inter-American Observatory by the High-z Supernova Search Team(HZT) and subsequently followed with many ground-based telescopes. SNe 1999Q and 1999U were also observed with the Hubble Space Telescope. We computed luminosity distances to the new SNe using two methods and added them to the high-z Hubble diagram that the HZT has been constructing since 1995. The new distance moduli confirm the results of previous work. At z approximate to 0: 5, luminosity distances are larger than those expected for an empty universe, implying that a "cosmological constant,'' or another form of "dark energy,'' has been increasing the expansion rate of the universe during the last few billion years. Combining these new HZT SNe Ia with our previous results and assuming a Delta CDM cosmology, we estimate the cosmological parameters that best fit our measurements. For a sample of 75 low-redshift and 47 high-redshift SNe Ia with MLCS2k2 (Jha and coworkers) luminosity calibration we obtain Omega(M) = 0: 79(-0.18)(+0.15) and Omega(Lambda) = 1.57(-0.32)(+0.24) (1 sigma uncertainties) if no constraints are imposed, or Omega(M) = 0.29(-0.05)(+0.06) if Omega(M) + Omega(Lambda) = 1 is assumed. For a different sample of 58 low-redshift and 48 high-redshift SNe Ia with luminosity calibrations done using the PRES method (a generalization of the Delta m(15) method), the results are Omega(M) = 0.43(-0.19)(+0.17) and Omega(Lambda) = 1.18(-0.28)(+0.27) (1 sigma uncertainties) if no constraints are imposed, or Omega(M) = 0.18(-0.04)(+0.05) if Omega(M) + Omega(Lambda) = 1 is assumed.
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    Hubble Space Telescope observations of nine high-redshift essence supernovae
    (2005) Krisciunas, K; Garnavich, PM; Challis, P; Prieto, JL; Riess, AG; Barris, B; Aguilera, C; Becker, AC; Blondin, S; Chornock, R; Clocchiatti, A; Covarrubias, R; Filippenko, AV; Foley, RJ; Hicken, M; Jha, S; Kirshner, RP; Leibundgut, B; Li, WD; Matheson, T; Miceli, A; Miknaitis, G; Rest, A; Salvo, ME; Schmidt, BP; Smith, RC; Sollerman, J; Spyromilio, J; Stubbs, CW; Suntzeff, NB; Tonry, JL; Wood-Vasey, WM
    We present broadband light curves of nine supernovae ranging in redshift from 0.5 to 0.8. The supernovae were discovered as part of the ESSENCE project, and the light curves are a combination of Cerro Tololo 4 m and Hubble Space Telescope (HST) photometry. On the basis of spectra and/or light-curve fitting, eight of these objects are definitely Type Ia supernovae, while the classification of one is problematic. The ESSENCE project is a 5 yr endeavor to discover about 200 high-redshift Type Ia supernovae, with the goal of tightly constraining the time average of the equation-of-state parameter [w = p/(rho c(2))] of the "dark energy." To help minimize our systematic errors, all of our ground-based photometry is obtained with the same telescope and instrument. In 2003 the highest redshift subset of ESSENCE supernovae was selected for detailed study with HST. Here we present the first photometric results of the survey. We find that all but one of the ESSENCE supernovae have slowly declining light curves and that the sample is not representative of the low-redshift set of ESSENCE Type Ia supernovae. This is unlikely to be a sign of evolution in the population. We attribute the decline-rate distribution of HST events to a selection bias at the high-redshift edge of our sample and find that such a bias will infect other magnitude-limited Type Ia supernova searches unless appropriate precautions are taken.