6 documents found, page 1 of 1
Square Kilometre Array Science Data Challenge 1: analysis and results
Bonaldi, A.; T. An; Bruggen, M.; Burkutean, S.; Coelho, B.; Goodarzi, H.; Hartley, P.; Sandhu, P. K.; Wu, C.; L. Yu; Haghighi, M. H. ZhoolidehAs the largest radio telescope in the world, the Square Kilometre Array (SKA) will lead the next generation of radio astronomy. The feats of engineering required to construct the telescope array will be matched only by the techniques developed to exploit the rich scientific value of the data. To drive forward the development of efficient and accurate analysis methods, we are designing a series of data challenge...
A recurrent nova super-remnant in the Andromeda galaxy
Darnley, M. J.; Hounsell, R.; O’Brien, T. J.; Henze, M.; Rodríguez-Gil, P.; Shafter, A. W.; Shara, M. M.; Vaytet, N. M. H.; Bode, M. F.; Ciardullo, R.The accretion of hydrogen onto a white dwarf star ignites a classical nova eruption 1,2 —a thermonuclear runaway in the accumulated envelope of gas, leading to luminosities up to a million times that of the Sun and a high-velocity mass ejection that produces a remnant shell (mainly consisting of insterstellar medium). Close to the upper mass limit of a white dwarf 3 (1.4 solar masses), rapid accretion of hydrog...
Breaking the Habit: The Peculiar 2016 Eruption of the Unique Recurrent Nova M31...
Henze, M.; Darnley, M. J.; Williams, S. C.; Kato, M.; Hachisu, I.; Anupama, G. C.; Arai, A.; Boyd, D.; Burke, D.; Ciardullo, R.; Chinetti, K.Since its discovery in 2008, the Andromeda galaxy nova M31N 2008-12a has been observed in eruption every single year. This unprecedented frequency indicates an extreme object, with a massive white dwarf and a high accretion rate, which is the most promising candidate for the single-degenerate progenitor of a type-Ia supernova known to date. The previous three eruptions of M31N 2008-12a have displayed remarkably...
Multiwavelength observations of nova SMCN 2016-10a - one of the brightest novae...
Aydi, E.; Page, K. L.; Kuin, N. P. M.; Darnley, M. J.; Walter, F. M.; Mróz, P.; Buckley, D.; Mohamed, S.; Whitelock, P.; Woudt, P.; Williams, S. C.We report on multiwavelength observations of nova Small Magellanic Cloud Nova 2016-10a. The present observational set is one of the most comprehensive for any nova in the Small Magellanic Cloud, including low-, medium-, and high-resolution optical spectroscopy and spectropolarimetry from Southern African Large Telescope, Folded Low-Order Yte-Pupil Double-Dispersed Spectrograph, and Southern Astrophysical Resear...
No Neon, but Jets in the Remarkable Recurrent Nova M31N 2008-12a?—Hubble Space ...
Darnley, M. J.; Hounsell, R.; Godon, P.; Perley, D. A.; Henze, M.; Kuin, N. P. M.; Williams, B. F.; Williams, S. C.; Bode, M. F.; Harman, D. J.The 2008 discovery of an eruption of M31N 2008-12a began a journey on which the true nature of this remarkable recurrent nova continues to be revealed. M31N 2008-12a contains a white dwarf (WD) close to the Chandrasekhar limit, accreting at a high rate from its companion, and undergoes thermonuclear eruptions that are observed yearly and may even be twice as frequent. In this paper, we report on Hubble Space Te...
Inflows, Outflows, and a Giant Donor in the Remarkable Recurrent Nova M31N 2008...
Darnley, M. J.; Hounsell, R.; Godon, P.; Perley, D. A.; Henze, M.; Kuin, N. P. M.; Williams, B. F.; Williams, S. C.; Bode, M. F.; Harman, D. J.The recurrent nova M31N 2008-12a experiences annual eruptions, contains a near-Chandrasekhar-mass white dwarf, and has the largest mass accretion rate in any nova system. In this paper, we present Hubble Space Telescope (HST) WFC3/UVIS photometry of the late decline of the 2015 eruption. We couple these new data with archival HST observations of the quiescent system and Keck spectroscopy of the 2014 eruption. T...