Resolving the delta Andromedae spectroscopic binary with direct imaging
Michael Bottom, Jonas Kuhn, Bertrand Mennesson, Dimitri Mawet, Jean C., Shelton, J. Kent Wallace, Eugene Serabyn
TL;DR
This paper reports the first direct imaging of the innermost companion to delta Andromedae, identifying it as a main-sequence K-type star rather than a white dwarf, using advanced coronagraphy and data analysis techniques.
Contribution
It introduces a novel application of the Stellar Double Coronagraph and MCMC algorithms for direct imaging and characterization of a binary companion.
Findings
Companion is a main-sequence K-type star.
The companion is not a white dwarf as previously hypothesized.
Successful direct imaging of a close binary companion.
Abstract
We present a direct image of the innermost companion to the red giant delta Andromedae using the Stellar Double Coronagraph at the Palomar Observatory. We use a Markov chain Monte Carlo based algorithm to simultaneously reduce the data and perform astrometry and photometry of the companion. We determine that the companion is most likely a main-sequence K-type star and is certainly not the previously hypothesized white dwarf.
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