Looking For Low Mass Companions To White Dwarfs In All The Right Places

Details Looking For Low Mass Companions To White Dwarfs In All The Right Places Looking For Low Mass Companions To White Dwarfs In All The Right Places

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30856h&link_type=abstract

Spitzer Proposal ID #30856

Computer Science

Scientific paper

We propose a SPITZER GO program which seeks IRAC band excesses, due to the cool low mass companions to DA (pure hydrogen) white dwarfs. These data would: 1) confirm the existence of the companions, 2) better identify the spectral type of the companions, and 3) increase the number of known systems which contain very late M to early L companions. Our technique is unique in that it relies on DA white dwarfs with known spectroscopic temperatures and gravities, to predict the 2MASS JHKs magnitudes of the degenerate stars together with the observed 2MASS JHKs magnitudes, to determine net Near-IR excesses in each target. Since these excesses are well calibrated, it is possible to make first order estimates of the absolute magnitudes of the single late M and early L dwarf companions responsible for the excesses. In this way we can also focus on systems which contain relatively young white dwarfs, which maximize the thermal luminosity of any L dwarf companions, of which few examples are presently known.

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