Browsing by Author "Nomoto, Ken'ichi"

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    • Catching Element Formation In The Act 

      Fryer, Chris L.; Timmes, Frank; Hungerford, Aimee L.; Couture, Aaron; Adams, Fred; Aoki, Wako; Arcones, Almudena; Arnett, David; Auchettl, Katie; Avila, Melina; Badenes, Carles; Baron, Eddie; Bauswein, Andreas; Beacom, John; Blackmon, Jeff; Blondin, Stephane; Bloser, Peter; Boggs, Steve; Boss, Alan; Brandt, Terri; Bravo, Eduardo; Brown, Ed; Brown, Peter; Budtz-Jorgensen, Steve Bruenn Carl; Burns, Eric; Calder, Alan; Caputo, Regina; Champagne, Art; Chevalier, Roger; Chieffi, Alessandro; Chipps, Kelly; Cinabro, David; Clarkson, Ondrea; Clayton, Don; Coc, Alain; Connolly, Devin; Conroy, Charlie; Cote, Benoit; Couch, Sean; Dauphas, Nicolas; deBoer, Richard James; Deibel, Catherine; Denisenkov, Pavel; Desch, Steve; Dessart, Luc; Diehl, Roland; Doherty, Carolyn; Dominguez, Inma; Dong, Subo; Dwarkadas, Vikram; Fan, Doreen; Fields, Brian; Fields, Carl; Filippenko, Alex; Fisher, Robert; Foucart, Francois; Fransson, Claes; Frohlich, Carla; Fuller, George; Gibson, Brad; Giryanskaya, Viktoriya; Gorres, Joachim; Goriely, Stephane; Grebenev, Sergei; Grefenstette, Brian; Grohs, Evan; Guillochon, James; Harpole, Alice; Harris, Chelsea; Harris, J. Austin; Harrison, Fiona; Hartmann, Dieter; Hashimoto, Masa-aki; Heger, Alexander; Hernanz, Margarita; Herwig, Falk; Hirschi, Raphael; Hix, Raphael William; Hoflich, Peter; Hoffman, Robert; Holcomb, Cole; Hsiao, Eric; Iliadis, Christian; Janiuk, Agnieszka; Janka, Thomas; Jerkstrand, Anders; Johns, Lucas; Jones, Samuel; Jose, Jordi; Kajino, Toshitaka; Karakas, Amanda; Karpov, Platon; Kasen, Dan; Kierans, Carolyn; Kippen, Marc; Korobkin, Oleg; Kobayashi, Chiaki; Kozma, Cecilia; Krot, Saha; Kumar, Pawan; Kuvvetli, Irfan; Laird, Alison; Laming, Martin; Larsson, Josefin; Lattanzio, John; Lattimer, James; Leising, Mark; Lennarz, Annika; Lentz, Eric; Limongi, Marco; Lippuner, Jonas; Livne, Eli; Lloyd-Ronning, Nicole; Longland, Richard; Lopez, Laura A.; Lugaro, Maria; Lutovinov, Alexander; Madsen, Kristin; Malone, Chris; Matteucci, Francesca; McEnery, Julie; Meisel, Zach; Messer, Bronson; Metzger, Brian; Meyer, Bradley; Meynet, Georges; Mezzacappa, Anthony; Miller, Jonah; Miller, Richard; Milne, Peter; Misch, Wendell; Mitchell, Lee; Mosta, Philipp; Motizuki, Yuko; Muller, Bernhard; Mumpower, Matthew; Murphy, Jeremiah; Nagataki, Shigehiro; Nakar, Ehud; Nomoto, Ken'ichi; Nugent, Peter; Nunes, Filomena; O'Shea, Brian; Oberlack, Uwe; Pain, Steven; Parker, Lucas; Perego, Albino; Pignatari, Marco; Pinedo, Gabriel Martinez; Plewa, Tomasz; Poznanski, Dovi; Priedhorsky, William; Pritychenko, Boris; Radice, David; Ramirez-Ruiz, Enrico; Rauscher, Thomas; Reddy, Sanjay; Rehm, Ernst; Reifarth, Rene; Richman, Debra; Ricker, Paul; Rijal, Nabin; Roberts, Luke; Ropke, Friedrich; Rosswog, Stephan; Ruiter, Ashley J.; Ruiz, Chris; Savin, Daniel Wolf; Schatz, Hendrik; Schneider, Dieter; Schwab, Josiah; Seitenzahl, Ivo; Shen, Ken; Siegert, Thomas; Sim, Stuart; Smith, David; Smith, Karl; Smith, Michael; Sollerman, Jesper; Sprouse, Trevor; Spyrou, Artemis; Starrfield, Sumner; Steiner, Andrew; Strong, Andrew W.; Sukhbold, Tuguldur; Suntzeff, Nick; Surman, Rebecca; Tanimori, Toru; The, Lih-Sin; Thielemann, Friedrich-Karl; Tolstov, Alexey; Tominaga, Nozomu; Tomsick, John; Townsley, Dean; Tsintari, Pelagia; Tsygankov, Sergey; Vartanyan, David; Venters, Tonia; Vestrand, Tom; Vink, Jacco; Waldman, Roni; Wang, Lifang; Wang, Xilu; Warren, MacKenzie; West, Christopher; Wheeler, J. Craig; Wiescher, Michael; Winkler, Christoph; Winter, Lisa; Wolf, Bill; Woolf, Richard; Woosley, Stan; Wu, Jin; Wrede, Chris; Yamada, Shoichi; Young, Patrick; Zegers, Remco; Zingale, Michael; Zwart, Simon Portegies (2019-03-31)
      Gamma-ray astronomy explores the most energetic photons in nature to address some of the most pressing puzzles in contemporary astrophysics. It encompasses a wide range of objects and phenomena: stars, supernovae, novae, ...

    • Chemical enrichment in the carbon-enhanced damped Ly α system by population III supernovae 

      Kobayashi, Chiaki; Tominaga, Nozomu; Nomoto, Ken'ichi (2011-04-01)
      We show that the recently observed elemental abundance pattern of the carbon-rich metal-poor damped Ly alpha (DLA) system is in excellent agreement with the nucleosynthesis yields of faint core-collapse supernovae of ...

    • Faint Population III supernovae as the origin of the most iron-poor stars 

      Ishigaki, Miho N.; Tominaga, Nozomu; Kobayashi, Chiaki; Nomoto, Ken'ichi (2014-08-26)
      The most iron-deficient stars in the Milky Way provide important observational constraints on the nature of astrophysical objects that have enriched the primordial gas with heavy elements from which these stars were formed. ...

    • Galactic chemical evolution : Carbon through zinc 

      Kobayashi, C.; Umeda, Hideyuki; Nomoto, Ken'ichi; Tominaga, Nozomu; Ohkubo, Takuya (2006-12-20)
      We calculate the evolution of heavy-element abundances from C to Zn in the solar neighborhood, adopting our new nucleosynthesis yields. Our yields are calculated for wide ranges of metallicity (Z = 0-Z circle dot) and the ...

    • The Initial mass function of the first stars inferred from extremely metal-poor stars 

      Ishigaki, Miho N.; Tominaga, Nozomu; Kobayashi, Chiaki; Nomoto, Ken'ichi (2018-04-11)
      We compare the elemental abundance patterns of ~200 extremely metal-poor (EMP; [Fe/H] < −3) stars to the supernova yields of metal-free stars, in order to obtain insights into the characteristic masses of the first (Population ...

    • A Minimum Dilution Scenario for Supernovae and Consequences for Extremely Metal-Poor Stars 

      Magg, Mattis; Nordlander, Thomas; Glover, Simon C. O.; Hansen, Camilla J.; Ishigaki, Miho; Heger, Alexander; Klessen, Ralf S.; Kobayashi, Chiaki; Nomoto, Ken'ichi (2020-11-01)
      To date no metal-free stars have been identified by direct observations. The most common method of constraining their properties is searching the spectra of the most metal-poor stars for the chemical elements created in ...

    • New Type Ia supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies 

      Kobayashi, Chiaki; Leung, Shing-Chi; Nomoto, Ken'ichi (2020-06-04)
      In our quest to identify the progenitors of Type Ia supernovae (SNe Ia), we first update the nucleosynthesis yields both for Chandrasekhar (Ch) and sub-Ch mass white dwarfs (WDs), for a wide range of metallicity, with our ...

    • Nucleosynthesis yields of core-collapse supernovae and hypernovae, and galactic chemical evolution 

      Nomoto, Ken'ichi; Tominaga, Nozomu; Umeda, Hideyuki; Kobayashi, C.; Maeda, Keiichi (2006-10-17)
      We present new nucleosynthesis yields as functions of the stellar mass, metallicity, and explosion energy (corresponding to normal supernovae and hypernovae). We apply the results to the chemical evolution of the solar ...

    • The origin of low [alpha/Fe] ratios in extremely metal-poor stars 

      Kobayashi, Chiaki; Ishigaki, Miho N.; Tominaga, Nozomu; Nomoto, Ken'ichi (2014-03-25)
      We show that the low ratios of $\alpha$ elements (Mg, Si, and Ca) to Fe recently found for a small fraction of extremely metal-poor stars can be naturally explained with the nucleosynthesis yields of core-collapse supernovae, ...

    • Origin of metals in old Milky Way halo stars based on GALAH and Gaia 

      Ishigaki, Miho N.; Hartwig, Tilman; Tarumi, Yuta; Leung, Shing-Chi; Tominaga, Nozomu; Kobayashi, Chiaki; Magg, Mattis; Simionescu, Aurora; Nomoto, Ken'ichi (2021-10-01)
      Stellar and supernova nucleosynthesis in the first few billion years of the cosmic history have set the scene for early structure formation in the Universe, while little is known about their nature. Making use of stellar ...

    • The role of Type Ia Supernovae in chemical evolution 1 : Lifetime of Type Ia Supernovae and metallicity effect 

      Kobayashi, Chiaki; Nomoto, Ken'ichi (2009-12-20)
      We construct a new model of Type Ia Supernovae (SNe Ia), based on the single degenerate scenario, taking account of the metallicity dependences of white dwarf (WD) wind and the mass-stripping effect on the binary companion ...

    • Standing on the shoulders of giants : New mass and distance estimates for Betelgeuse through combined evolutionary, asteroseismic, and hydrodynamical simulations with MESA 

      Joyce, Meridith; Leung, Shing-Chi; Molnár, László; Ireland, Michael J.; Kobayashi, Chiaki; Nomoto, Ken'ichi (2020-10-13)
      We conduct a rigorous examination of the nearby red supergiant Betelgeuse by drawing on the synthesis of new observational data and three different modeling techniques. Our observational results include the release of new, ...

    • Subclasses of Type Ia Supernovae as the origin of [α/Fe] ratios in dwarf spheroidal galaxies 

      Kobayashi, Chiaki; Nomoto, Ken'ichi; Hachisu, Izumi (2015-04-23)
      Recent extensive observations of Type Ia Supernovae (SNe Ia) have revealed the existence of a diversity of SNe Ia, including SNe Iax. We introduce two possible channels in the single degenerate scenario: 1) double detonations ...