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A Dark Spot on a Massive White Dwarf
Mukremin Kilic, Alexandros Gianninas, Keaton J. Bell +7
We present the serendipitous discovery of eclipse-like events around the massive white dwarf SDSS J152934.98+292801.9 (hereafter J1529+2928). We selected J1529+2928 for time-series…
A disintegrating minor planet transiting a white dwarf
Andrew Vanderburg, John Asher Johnson, Saul Rappaport +16
White dwarfs are the end state of most stars, including the Sun, after they exhaust their nuclear fuel. Between 1/4 and 1/2 of white dwarfs have elements heavier than helium in the…
The ELM Survey. VI. Eleven New Double Degenerates
A. Gianninas, Mukremin Kilic, Warren R. Brown +2
We present the discovery of 11 new double degenerate systems containing extremely low-mass white dwarfs (ELM WDs). Our radial velocity observations confirm that all of the targets…
SN~2012cg: Evidence for Interaction Between a Normal Type Ia Supernova and a Non-Degenerate Binary Companion
G. H. Marion, Peter J. Brown, Jozsef Vinkó +26
We report evidence for excess blue light from the Type Ia supernova SN 2012cg at fifteen and sixteen days before maximum B-band brightness. The emission is consistent with predicti…
SDSS J1152+0248: An eclipsing double white dwarf from the Kepler K2 campaign
N. Hallakoun, D. Maoz, M. Kilic +13
We report the discovery of the sixth known eclipsing double white dwarf (WD) system, SDSS J1152+0248, with a 2.3968 +/- 0.0003 h orbital period, in data from the Kepler Mission's K…
Stellar Velocity Dispersion and Anisotropy of the Milky Way Inner Halo
Charles King, Warren R. Brown, Margaret J. Geller +1
We measure the three components of velocity dispersion, , for stars within 6 < R < 30 kpc of the Milky Way using a new radial velocity sample from the MMT telescope.…