Zobrazeno 1 - 10
of 450
pro vyhledávání: '"Levitan, D."'
Publikováno v:
In Electrochimica Acta 20 October 2023 466
Autor:
van Roestel, J., Groot, P. J., Kupfer, T., Verbeek, K., van Velzen, S., Bours, M., Nugent, P., Prince, T., Levitan, D., Nissanke, S., Kulkarni, S. R., Laher, R. R.
We present results of the Sky2Night project: a systematic, unbiased search for fast optical transients with the Palomar Transient Factory. We have observed 407 deg$^2$ in $R$-band for 8 nights at a cadence of 2 hours. During the entire duration of th
Externí odkaz:
http://arxiv.org/abs/1902.03768
Autor:
van Roestel, J., Groot, P. J., Levitan, D., Prince, T. A., Bloemen, S., Marsh, T. R., Dhillon, V. S., Shupe, D., Laher, R.
Publikováno v:
Mon Not R Astron Soc 2017; 468 (3): 3109-3122
We report the discovery and analysis of PTF1 J085713+331843, a new eclipsing post common-envelope detached white-dwarf red-dwarf binary with a 2.5h orbital period discovered by the Palomar Transient Factory. ULTRACAM multicolour photometry over multi
Externí odkaz:
http://arxiv.org/abs/1704.01182
Autor:
Mooley, K. P., Hallinan, G., Bourke, S., Horesh, A., Myers, S. T., Frail, D. A., Kulkarni, S. R., Levitan, D. B., Kasliwal, M. M., Cenko, S. B., Cao, Y., Bellm, E., Laher, R. R.
We have commenced a multi-year program, the Caltech-NRAO Stripe 82 Survey (CNSS), to search for radio transients with the Jansky VLA in the SDSS Stripe 82 region. The CNSS will deliver five epochs over the entire $\sim$270 deg$^2$ of Stripe 82, an ev
Externí odkaz:
http://arxiv.org/abs/1601.01693
Autor:
Kupfer, T., Groot, P. J., Bloemen, S., Levitan, D., Steeghs, D., Marsh, T. R., Rutten, R. G. M., Nelemans, G., Prince, T. A., Fürst, F., Geier, S.
{\it Kepler} satellite photometry and phase-resolved spectroscopy of the ultracompact AM CVn type binary SDSS J190817.07+394036.4 are presented. The average spectra reveal a variety of weak metal lines of different species, including silicon, sulphur
Externí odkaz:
http://arxiv.org/abs/1507.03926
Autor:
Schindewolf, M., Levitan, D., Heber, U., Drechsel, H., Schaffenroth, V., Kuper, T., Prince, T.
Publikováno v:
A&A 580, A117 (2015)
We report the discovery of an eclipsing binary -- PTF1 J072456$+$125301-- composed of a subdwarf B (sdB) star ($g'=17.2^m$) with a faint companion. Subdwarf B stars are core helium-burning stars, which can be found on the extreme horizontal branch. A
Externí odkaz:
http://arxiv.org/abs/1506.03787
Autor:
Geier, S., Fürst, F., Ziegerer, E., Kupfer, T., Heber, U., Irrgang, A., Wang, B., Liu, Z., Han, Z., Sesar, B., Levitan, D., Kotak, R., Magnier, E., Smith, K., Burgett, W. S., Chambers, K., Flewelling, H., Kaiser, N., Wainscoat, R., Waters, C.
Publikováno v:
Science 347, S. 1126-1128, 2015
Hypervelocity stars (HVS) travel with velocities so high, that they exceed the escape velocity of the Galaxy. Several acceleration mechanisms have been discussed. Only one HVS (US 708, HVS 2) is a compact helium star. Here we present a spectroscopic
Externí odkaz:
http://arxiv.org/abs/1503.01650
Autor:
Sesar, B., Banholzer, S. R., Cohen, J. G., Martin, N. F., Grillmair, C. J., Levitan, D., Laher, R. R., Ofek, E. O., Surace, J. A., Kulkarni, S. R., Prince, T. A., Rix, H. -W.
Almost every known low-luminosity Milky Way dwarf spheroidal (dSph) satellite galaxy contains at least one RR Lyrae star. Assuming that a fraction of distant (60 < d_{helio} < 100 kpc) Galactic halo RR Lyrae stars are members of yet to be discovered
Externí odkaz:
http://arxiv.org/abs/1407.1835
Autor:
Hovatta, T., Pavlidou, V., King, O. G., Mahabal, A., Sesar, B., Dancikova, R., Djorgovski, S. G., Drake, A., Laher, R., Levitan, D., Max-Moerbeck, W., Ofek, E. O., Pearson, T. J., Prince, T. A., Readhead, A. C. S., Richards, J. L., Surace, J.
We use optical data from the Palomar Transient Factory (PTF) and the Catalina Real-Time Transient Survey (CRTS) to study the variability of gamma-ray detected and non-detected objects in a large population of active galactic nuclei (AGN) selected fro
Externí odkaz:
http://arxiv.org/abs/1401.0538
Autor:
Kupfer, T., Groot, P. J., Levitan, D., Steeghs, D., Marsh, T. R., Rutten, R. G. M., Nelemans, G.
Phase-resolved spectroscopy of four AM CVn systems obtained with the William Herschel Telescope and the Gran Telescopio de Canarias (GTC) is presented. SDSS\,J120841.96+355025.2 was found to have an orbital period of 52.96$\pm$0.40\,min and shows the
Externí odkaz:
http://arxiv.org/abs/1303.5610