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The Effects Of Dust On The Optical And Infrared Evolution Of Sn 2004et, J. Fabbri, M. Otsuka, M. J. Barlow, Joseph S. Gallagher, R. Wesson, B. E.K. Sugerman, Geoffrey C. Clayton, M. Meixner, J. E. Andrews, D. L. Welch, B. Ercolano
The Effects Of Dust On The Optical And Infrared Evolution Of Sn 2004et, J. Fabbri, M. Otsuka, M. J. Barlow, Joseph S. Gallagher, R. Wesson, B. E.K. Sugerman, Geoffrey C. Clayton, M. Meixner, J. E. Andrews, D. L. Welch, B. Ercolano
Faculty Publications
We present an analysis of multi-epoch observations of the Type II-P supernova SN 2004et. New and archival optical spectra of SN 2004et are used to study the evolution of the Hα and [Oi] 6300-Å line profiles between days 259 and 646. Mid-infrared imaging with Michelle on Gemini-North and with all three instruments of the Spitzer Space Telescope was carried out between 2004 and 2010, supplemented by archival Spitzer data. We include Spitzer'warm' mission photometry at 3.6 and 4.5μm obtained on days 1779, 1931 and 2151, along with ground-based and Hubble Space Telescope (HST) optical and near-infrared observations obtained between days …
Critical Differences And Clues In Eta Car's 2009 Event, Andrea Mehner, Kris Davidson, John C. Martin, Roberta M. Humphreys, Kazunori Ishibashi, Gary J. Ferland
Critical Differences And Clues In Eta Car's 2009 Event, Andrea Mehner, Kris Davidson, John C. Martin, Roberta M. Humphreys, Kazunori Ishibashi, Gary J. Ferland
Physics and Astronomy Faculty Publications
We monitored Eta Carinae with the Hubble Space Telescope WFPC2 and Gemini GMOS throughout the 2009 spectroscopic event, which was expected to differ from its predecessor in 2003. Here we report major observed differences between events and their implications. Some of these results were quite unexpected. (1) The UV brightness minimum was much deeper in 2009. This suggests that physical conditions in the early stages of an event depend on different parameters than the "normal" inter-event wind. Extra mass ejection from the primary star is one possible cause. (2) The expected He II λ4687 brightness maximum was followed several weeks …
Spectroscopic Hα And Hγ Survey Of Field Be Stars: 2004-2009, Erika D. Grundstrom, Douglas R. Gies, Christina Aragona, Tabetha S. Boyajian, E. Victor Garcia, Amber N. Marsh, M. Virginia Mcswain, Rachael M. Roettenbacher, Stephen J. Williams, David W. Wingert
Spectroscopic Hα And Hγ Survey Of Field Be Stars: 2004-2009, Erika D. Grundstrom, Douglas R. Gies, Christina Aragona, Tabetha S. Boyajian, E. Victor Garcia, Amber N. Marsh, M. Virginia Mcswain, Rachael M. Roettenbacher, Stephen J. Williams, David W. Wingert
Faculty Publications
Massive O- and B-type stars are "cosmic engines" in the Universe and can be the dominant source of luminosity in a galaxy. The class of Be stars are rapidly rotating B-type stars that lose mass in an equatorial, circumstellar disk (Porter & Rivinius 2003) and cause Balmer and other line emission. Currently, we are unsure as to why these stars rotate so quickly but three scenarios are possible: they may have been born as rapid rotators, spun up by binary mass transfer, or spun up during the main-sequence evolution of B stars. In order to investigate these scenarios for this …
Dust And The Type Ii-Plateau Supernova 2004dj, W. P. S. Meikle, R. Kotak, D. Farrah, S. Mattila, S. D. Van Dyk, A. C. Andersen, R. Fesen
Dust And The Type Ii-Plateau Supernova 2004dj, W. P. S. Meikle, R. Kotak, D. Farrah, S. Mattila, S. D. Van Dyk, A. C. Andersen, R. Fesen
Dartmouth Scholarship
We present mid-infrared (MIR) spectroscopy of a Type II-plateau supernova, SN 2004dj, obtained with the Spitzer Space Telescope, spanning 106-1393 days after explosion. MIR photometry plus optical/near-IR observations are also reported. An early-time MIR excess is attributed to emission from non-silicate dust formed within a cool dense shell (CDS). Most of the CDS dust condensed between 50 days and 165 days, reaching a mass of 0.3 × 10–5 M ☉. Throughout the observations, much of the longer wavelength (>10 μm) part of the continuum is explained as an IR echo from interstellar dust. The MIR excess …
The 2011 Outburst Of The Recurrent Nova T Pyxidis. Evidence For A Face-On Bipolar Ejection, O. Chesneau, A. Meilland, D. P.K. Banerjee, J. B. Le Bouquin, H. Mcalister, F. Millour, S. T. Ridgway, A. Spang, T. Ten Brummelaar, M. Wittkowski, N. M. Ashok, M. Benisty, J. P. Berger, T. Boyajian, Ch Farrington, P. J. Goldfinger, A. Merand, N. Nardetto, R. Petrov, Th Rivinius, G. Schaefer, Y. Touhami, G. Zins
The 2011 Outburst Of The Recurrent Nova T Pyxidis. Evidence For A Face-On Bipolar Ejection, O. Chesneau, A. Meilland, D. P.K. Banerjee, J. B. Le Bouquin, H. Mcalister, F. Millour, S. T. Ridgway, A. Spang, T. Ten Brummelaar, M. Wittkowski, N. M. Ashok, M. Benisty, J. P. Berger, T. Boyajian, Ch Farrington, P. J. Goldfinger, A. Merand, N. Nardetto, R. Petrov, Th Rivinius, G. Schaefer, Y. Touhami, G. Zins
Faculty Publications
Aims.T Pyx is the first recurrent nova ever historically studied. It was seen in outburst six times between 1890 and 1966 and then not for 45 years. We report on near-IR interferometric observations of the recent outburst of 2011. Methods.We obtained near-IR observations of T Pyx at dates ranging from t = 2.37 d to t = 48.2 d after the outburst, with the CLASSIC recombiner located at the CHARA array and with the PIONIER and AMBER recombiners located at the VLTI array. These data are supplemented with near-IR photometry and spectra obtained at Mount Abu, India. We compare expansion …
Spitzer 24Μm Survey For Dust Disks Around Hot White Dwarfs, You-Hua Chu, Kate Y.L. Su, Jana Bilikova, Robert A. Gruendl, Orsola De Marco, Martin A. Guerrero, Adria Updike, Kevin Volk, Thomas Rauch
Spitzer 24Μm Survey For Dust Disks Around Hot White Dwarfs, You-Hua Chu, Kate Y.L. Su, Jana Bilikova, Robert A. Gruendl, Orsola De Marco, Martin A. Guerrero, Adria Updike, Kevin Volk, Thomas Rauch
Arts & Sciences Faculty Publications
No abstract provided.