NOAO >   Observing Info >   Approved Programs >   2017A-0076

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Program Information for 2017A-0076


PI: Mukremin Kilic, U. of Oklahoma, kilic@ou.edu
Address: Physics Department, 440 W. Brooks Street, Norman, OK 73019 USA

CoI: Alek Kosakowski, U. of Oklahoma
CoI: Alexandros Gianninas, U. of Oklahoma
CoI: Warren Brown, Harvard-Smithsonian Center for Astrophysics
CoI: Carlos Allende Prieto, IAC Spain

Title: Double Degenerates in the SDSS + BOSS

Abstract: There are $sim,000 White Dwarfs (WDs) identified in the SDSS DR12 spectroscopy sample. A large fraction of these objects have multi- epoch spectroscopy in the original SDSS and the follow-up BOSS surveys. We use radial velocity measurements from the ELODIE pipeline to identify 86 white dwarfs with significant velocity shifts between the SDSS and BOSS surveys. The masses for these white dwarfs range from about 0.4 to 1 $M_$ (with a median around 0.6), providing an excellent opportunity to identify massive white dwarf binaries that are potential progenitors of Type Ia and under luminous supernovae. In addition, we use the SDSS+BOSS sub-exposures for targets brighter than 19th magnitude to identify another 53 radial velocity variables. The latter sample includes four previously known binary systems with periods 53-84 min, demonstrating the usefulness of this approach in identifying short period binary systems. Here we request 5 nights of either the CTIO 4m+COSMOS or SOAR 4m + Goodman to follow-up 23 of the targets visible from the southern hemisphere in the 2017A semester. Along with our proposed APO 3.5m telescope observations (through our institutional access), our goal is to constrain the orbital periods of these velocity variable white dwarfs. This will be the largest sample of double white dwarfs ever observed, and will provide stringent constraints on the double white dwarf merger rate and their contribution to supernovae Ia.

Program Type: Standard/Galactic

Scheduled Nights:
Run 2 (2017A):  SOAR/Goodman -- 5n on Mar 19 - Mar 23 2017


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-0076

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