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Massive stars exploding in a He-rich circumstellar medium – I. Type Ibn (SN 2006jc-like) events

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 389:1 (2008) 113-130

Authors:

A Pastorello, S Mattila, L Zampieri, M Della Valle, SJ Smartt, S Valenti, I Agnoletto, S Benetti, CR Benn, D Branch, E Cappellaro, M Dennefeld, JJ Eldridge, A Gal-Yam, A Harutyunyan, I Hunter, H Kjeldsen, Y Lipkin, PA Mazzali, P Milne, H Navasardyan, EO Ofek, E Pian, O Shemmer, S Spiro, RA Stathakis, S Taubenberger, M Turatto, H Yamaoka

Massive stars exploding in a He-rich circumstellar medium – III. SN 2006jc: infrared echoes from new and old dust in the progenitor CSM

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 389:1 (2008) 141-155

Authors:

S Mattila, WPS Meikle, P Lundqvist, A Pastorello, R Kotak, J Eldridge, S Smartt, A Adamson, CL Gerardy, L Rizzi, AW Stephens, SD Van Dyk

VLT detection of a red supergiant progenitor of the type IIP supernova 2008bk

(2008)

Authors:

S Mattila, SJ Smartt, JJ Eldridge, JR Maund, RM Crockett, IJ Danziger

The metamorphosis of supernova SN 2008D/XRF 080109: A link between supernovae and GRBs/hypernovae

Science 321:5893 (2008) 1185-1188

Authors:

PA Mazzali, S Valenti, M Della Valle, G Chincarini, DN Sauer, S Benetti, E Pian, T Piran, V D'Elia, N Elias-Rosa, R Margutti, F Pasotti, LA Antonelli, F Bufano, S Campana, E Cappellaro, S Covino, P D'Avanzo, F Fiore, D Fugazza, R Gilmozzi, D Hunter, K Maguire, E Maiorano, P Marziani, N Masetti, F Mirabel, H Navasardyan, K Nomoto, E Palazzi, A Pastorello, N Panagia, LJ Pellizza, R Sari, S Smartt, G Tagliaferri, M Tanaka, S Taubenberger, N Tominaga, C Trundle, M Turatto

Abstract:

The only supernovae (SNe) to show gamma-ray bursts (GRBs) or early x-ray emission thus far are overenergetic, broad-lined type Ic SNe (hypernovae, HNe). Recently, SN 2008D has shown several unusual features: (i) weak x-ray flash (XRF), (ii) an early, narrow optical peak, (iii) disappearance of the broad lines typical of SN Ic HNe, and (iv) development of helium lines as in SNe Ib. Detailed analysis shows that SN 2008D was not a normal supernova: Its explosion energy (E ≈ 6 × 1051 erg) and ejected mass [∼7 times the mass of the Sun (MFish eye)] are intermediate between normal SNe Ibc and HNe. We conclude that SN 2008D was originally a ∼30 M Fish eye star. When it collapsed, a black hole formed and a weak, mildly relativistic jet was produced, which caused the XRF. SN 2008D is probably among the weakest explosions that produce relativistic jets. Inner engine activity appears to be present whenever massive stars collapse to black holes.

Search for heavy, long-lived neutralinos that decay to photons at CDF II using photon timing

Physical Review D Particles Fields Gravitation and Cosmology 78:3 (2008)

Authors:

T Aaltonen, J Adelman, T Akimoto, MG Albrow, BA González, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, A Apresyan, T Arisawa, A Artikov, W Ashmanskas, A Attal, A Aurisano, F Azfar, P Azzurri, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, V Bartsch, G Bauer, PH Beauchemin, F Bedeschi, P Bednar, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, J Beringer, A Bhatti, M Binkley, D Bisello, I Bizjak, RE Blair, C Blocker, B Blumenfeld, A Bocci, A Bodek, V Boisvert, G Bolla, D Bortoletto, J Boudreau, A Boveia, B Brau, A Bridgeman, L Brigliadori, C Bromberg, E Brubaker, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, KL Byrum, S Cabrera, C Calancha, M Campanelli, M Campbell, F Canelli, A Canepa, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, SH Chang, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, G Choudalakis, SH Chuang, K Chung, WH Chung, YS Chung, CI Ciobanu, MA Ciocci, A Clark, D Clark, G Compostella

Abstract:

We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via χ10→γG in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570±34pb-1 of pp̄ collisions at s=1.96TeV, we select γ+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. We find 2 events, consistent with the background estimate of 1.3±0.7 events. While our search strategy does not rely on model-specific dynamics, we set cross section limits and place the world-best 95% C.L. lower limit on the χ 10 mass of 101GeV/c2 at τχ 10=5ns. © 2008 The American Physical Society.