Results 61 to 70 of about 166,732 (180)

Inferring Kilonova Ejecta Photospheric Properties from Early Blackbody Spectra

The Astrophysical Journal
We present simple analytic corrections to the standard blackbody fitting used for early kilonova emission. We consider a spherical, relativistically expanding shell that radiates thermally at a single temperature in its own rest frame.
Gilad Sadeh
doaj   +1 more source

Spectroscopic and Photometric Observations of Unidentified Ultraviolate Variable Objects in GUVV-2 Catalog

, 2011
An NUV-optical diagram made for sources from the secend Galaxy Evolution Explorer (GALEX) Ultraviolet Variability (GUVV-2) Catalog provide us a method to tentatively classify the unknown GUVV2 sources by their NUV-optical magnitudes.
Hawley, Jian-Yan Wei, Jing Wang, Lépine, Martin, Martín, Monet, Morrissey, Phillips, Shkolnik, Skillen, Stauffer, Stepanov, Welsh, Wheatley, Wheatley, Wilking, Xiang-Tao He, You Li, Zhou   +19 more
core   +1 more source

Tidal Disruption of a Star on a Nearly Circular Orbit

The Astrophysical Journal
We consider Roche lobe overflow (RLO) from a low-mass star on a nearly circular orbit, onto a supermassive black hole (SMBH). If mass transfer is unstable, its rate accelerates in a runaway process, resulting in highly super-Eddington mass accretion ...
Itai Linial, Eliot Quataert
doaj   +1 more source

Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh

The Astrophysical Journal
AT 2019azh is a H+He tidal disruption event (TDE) with one of the most extensive ultraviolet and optical data sets available to date. We present our photometric and spectroscopic observations of this event starting several weeks before and out to ...
Sara Faris, Iair Arcavi, Lydia Makrygianni, Daichi Hiramatsu, Giacomo Terreran, Joseph Farah, D. Andrew Howell, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, K. Azalee Bostroem, Wiam Abojanb, Marco C. Lam, Lina Tomasella, Thomas G. Brink, Alexei V. Filippenko, K. Decker French, Peter Clark, Or Graur, Giorgos Leloudas, Mariusz Gromadzki, Joseph P. Anderson, Matt Nicholl, Claudia P. Gutiérrez, Erkki Kankare, Cosimo Inserra, Lluís Galbany, Thomas Reynolds, Seppo Mattila, Teppo Heikkilä, Yanan Wang, Francesca Onori, Thomas Wevers, Eric R. Coughlin, Panos Charalampopoulos, Joel Johansson   +36 more
doaj   +1 more source

New views on the emission and structure of the solar transition region

, 2010
The Sun is the only star that we can spatially resolve and it can be regarded as a fundamental plasma laboratory of astrophysics. The solar transition region (TR), the layer between the solar chromosphere and corona, plays an important role in solar wind
Aiouaz, Aiouaz, Athay, Athay, Axford, Bartoe, Bartoe, Bartoe, Basri, Bocchialini, Bohlin, Bonnet, Brekke, Brosius, Brosius, Brosius, Brown, Brueckner, Brueckner, Brueckner, Brynildsen, Büchner, Büchner, Chae, Chae, Chae, Chen, Chen, Chen, Chuanyi Tu, Culhane, Curdt, Curdt, Curdt, Curdt, Curdt, Curdt, Dammasch, Dammasch, De Pontieu, Del Zanna, Dere, Dere, Dere, Doschek, Doschek, Doschek, Dowdy, Doyle, Doyle, Doyle, Doyle, Eckart Marsch, Evershed, Evershed, Falconer, Fang, Feldman, Feldman, Feldman, Fontenla, Fontenla, Foukal, Foukal, Foukal, Gabriel, Golub, Gontikakis, Gouttebroze, Gouttebroze, Griffiths, Gunár, Guo, Habbal, Hansteen, Hansteen, Harra, Harrison, Harrison, Hassler, He, He, He, Heinzel, Hui Tian, Hénoux, Ichimoto, Imada, Innes, Innes, Jiansen He, Jin, Jordan, Katsukawa, Kneer, Lemaire, Lemaire, Lemaire, Li, Liu, Longcope, Madjarska, Madjarska, Magara, Mariska, Mariska, Marsch, Marsch, Marsch, Marsch, Marsch, Marsch, McClymont, McIntosh, McIntosh, McIntosh, McIntosh, Metcalf, Nicolas, Nicolas, Parnell, Patsourakos, Peter, Peter, Peter, Peter, Peter, Popescu, Priest, Raju, Ravindra, Reeves, Sakao, Santos, Schmieder, Schrijver, Seehafer, Sheeley, Solanki, Stucki, Teriaca, Teriaca, Teriaca, Teriaca, Teriaca, Teriaca, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tu, Tu, Tu, Ugarte-Urra, Ugarte-Urra, Ugarte-Urra, Vernazza, Vernazza, Vial, Vial, Vial, Wang, Wang, Warren, Watanabe, Webb, Werner Curdt, Wiegelmann, Wiegelmann, Wiegelmann, Wilhelm, Wilhelm, Wilhelm, Wilhelm, Wilhelm, Xia, Xia, Xia, Xu, Zhang, Zhang, Zhang, Zhang, Zhang, Zhang   +192 more
core   +1 more source

Nonlinear XUV signal generation probed by transient grating spectroscopy with attosecond pulses

Nature Communications, 2019
Nonlinear spectroscopies are utilized extensively for selective measurements of chemical dynamics in the optical, infrared, and radio-frequency regimes.
A. Fidler, S. Camp, Erika R Warrick, E. Bloch, Hugo J. B. Marroux, D. Neumark, K. Schafer, M. Gaarde, S. Leone   +8 more
semanticscholar   +1 more source

Fast Transients from Magnetic Disks around Nonspinning Collapsar Black Holes

The Astrophysical Journal Letters
Most black holes (BHs) formed in collapsing stars have low spin, though some are expected to acquire a magnetic accretion disk during the collapse. While such BH disks can launch magnetically driven winds, their physics and observational signatures have ...
Justin Bopp, Ore Gottlieb
doaj   +1 more source

Investigation of laser dynamics, modulation and control by means of intra-cavity time varying perturbation [PDF]

The generation of tunable visible, infrared, and ultraviolet light is examined, along with the control of this light by means of novel mode-locking and modulation techniques.
Bekkers, G. W., Bloom, D. M., Harris, S. E., Kuizenga, D. J., Kung, A. H., Newton, J. H., Phillion, D. W., Siegman, A. E., Young, J. F.   +8 more
core   +1 more source

Tracking Cooper Pairs in a Cuprate Superconductor by Ultrafast Angle-Resolved Photoemission

, 2012
In high-temperature superconductivity, the process that leads to the formation of Cooper pairs, the fundamental charge carriers in any superconductor, remains mysterious.
A. Lanzara, Beck, C. Jozwiak, C. L. Smallwood, Cortes, Cuk, D.-H. Lee, Demsar, Gedik, H. Eisaki, J. D. Koralek, J. Orenstein, J. P. Hinton, Kabanov, Kusar, Lanzara, Lee, Norman, Perfetti, Petersen, Rettig, Rohwer, Segre, Torchinsky, W. Zhang, Wicks   +25 more
core   +1 more source

The Optical to X-Ray Luminosity and Spectrum of Supernova Wind Breakouts

The Astrophysical Journal
Observations indicate that an optically thick circumstellar medium (CSM) at radii of 10 ^14 –10 ^15 cm around Type II core-collapse supernova (SN) progenitors is common (and may be present in other types of massive star explosions).
Tal Wasserman, Nir Sapir, Peter Szabo, Eli Waxman   +3 more
doaj   +1 more source