Papers › An Imaging Search for Post-Main-Sequence Planets of Sirius B
An Imaging Search for Post-Main-Sequence Planets of Sirius B
Miles Lucas, Michael Bottom, Garreth Ruane, Sam Ragland
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We present deep imaging of Sirius B, the closest and brightest white dwarf, to constrain post-main-sequence planetary evolution in the Sirius system. We use Keck/NIRC2 in L'-band (3.776 μm) across three epochs in 2020 using the technique of angular differential imaging. Our observations are speckle-limited out to 1 AU and background-limited beyond. The 5σ detection limits from our best performing epoch are 17 to 20.4 L' absolute magnitude. We consider multiple planetary formation pathways in the context of Sirius B's evolution to derive mass sensitivity limits, and achieve sub-Jupiter sensitivities at sub-AU separations, reaching 1.6 M_J to 2.4 M_J at 0.5 AU down to a sensitivity of 0.7 M_J to 1.2 M_J at >1 AU. Consistent with previous results, we do not detect any companions around Sirius B. Our strong detection limits demonstrate the potential of using high-contrast imaging to characterize nearby white dwarfs.
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