NOAO >   Observing Info >   Approved Programs >   2017A-0208

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Program Information for 2017A-0208


PI: Paula Szkody, U. of Washington, szkody@astro.washington.edu
Address: Department of Astronomy, Box 351580, Seattle, WA, 98195-1580 USA

CoI: Anna Francesca Pala, University of Warwick
CoI: Boris T. Gaensicke, University of Warwick
CoI: Lars Bildsten, UC Santa Barbara
CoI: Domitilla de Martino, Osservatorio Astronomico di Capodimonte
CoI: Patrick Godon, Villanova U.
CoI: Arne Anthon Henden, AAVSO
CoI: Ivan Hubeny, U. of Arizona
CoI: Christian Knigge, University of Southampton
CoI: Knox S Long, STScI
CoI: Christopher Manser, University of Warwick
CoI: Tom Marsh, University of Warwick
CoI: Matthias Schreiber, Universidad de Valparaiso
CoI: Edward Sion, Villanova U.
CoI: Odette Toloza, University of Warwick
CoI: Dean Townsley, University of Alabama
CoI: Monica Zorotovic, Universidad de Valparaiso

Title: Do white dwarfs in cataclysmic varibales grow in mass?

Abstract: Type Ia supernovae are cosmic beacons that were crucial for the identification of dark energy, propelling cosmology into a new era. Yet, we are still unable to explain the precise origin of type Ia supernovae, the very tool that led to that discovery. In a recent study, we have shown it to be very likely that the accreting white dwarfs in cataclysmic variables grow in mass - in contradiction to widely accepted theoretical models predicting mass erosion as a consequence of classical nova eruptions. To corroborate our results, we are now in the process of doubling the number of accurate CV white dwarf masses, obtaining Ly-alpha spectroscopy of 33 CVs as part of a 122-orbit HST/COS program. Determining the white dwarf masses to a few per cent requires additional, dynamical constraints, and we apply here for phase-resolved GMOS observations to measure the radial velocities and the rotational broadening of the low-mass companion stars in three of our HST targets.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  GEM-NQ/GMOSN -- 13.6hrs band 1 (GN-2017A-Q-3)


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017A-0208

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