Aldebaran b's Temperate Past Uncovered in Planet Search Data

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DOI

  • Will M. Farr, Flatiron Inst, Ctr Computat Astrophys
  • ,
  • Benjamin J. S. Pope, NYU, New York University, Dept Phys, Ctr Cosmol & Particle Phys
  • ,
  • Guy R. Davies, Univ Birmingham, University of Birmingham, Sch Phys & Astron
  • ,
  • Thomas S. H. North, Univ Birmingham, University of Birmingham, Sch Phys & Astron
  • ,
  • Timothy R. White
  • ,
  • Jim W. Barrett, Univ Birmingham, University of Birmingham, Sch Phys & Astron
  • ,
  • Andrea Miglio, Univ Birmingham, University of Birmingham, Sch Phys & Astron
  • ,
  • Mikkel N. Lund
  • Victoria Antoci
  • Mads Fredslund Andersen
  • Frank Grundahl
  • Daniel Huber, Univ Sydney, University of Sydney, Sydney Inst Astron SIfA, Sch Phys, Univ Hawaii, University of Hawaii System, Inst Astron, SETI Inst

The nearby red giant Aldebaran is known to host a gas giant planetary companion from decades of ground-based spectroscopic radial velocity measurements. Using Gaussian Process-based Continuous Auto-Regressive Moving Average models, we show that these historic data also contain evidence of acoustic oscillations in the star itself, and verify this result with further dedicated ground-based spectroscopy using the SONG telescope and space-based photometry with the Kepler Space Telescope. From the frequency of these oscillations we determine the mass of Aldebaran to be 1.16 +/- 0.07 M-circle dot, and note that this implies its planet will have been subject to insolation comparable to the Earth for some of the star's main sequence lifetime. Our approach to sparse, irregularly sampled time series astronomical observations has the potential to unlock asteroseismic measurements for thousands of stars in archival data, and push to lower-mass planets around red giant stars.

Original languageEnglish
Article number20
JournalAstrophysical Journal Letters
Volume865
Issue2
Number of pages12
ISSN2041-8205
DOIs
Publication statusPublished - 1 Oct 2018

    Research areas

  • methods: data analysis, methods: statistical, planets and satellites: individual (Aldebaran b), stars: individual (Aldebaran), stars: oscillations (including pulsations), techniques: radial velocities, RADIAL-VELOCITY VARIATIONS, LONG SECONDARY PERIODS, RED GIANTS, SPACED DATA, STARS, DIAMETER, LINE, ASTEROSEISMOLOGY, CONFIRMATION, VARIABILITY

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