Aldebaran b’s temperate past uncovered in planet search data

Will M. Farr, Benjamin J. S. Pope, Guy R. Davies, Thomas S. H. North, Timothy R. White, Jim W. Barrett, Andrea Miglio, Mikkel N. Lund, Victoria Antoci, Mads Fredslund Andersen, Frank Grundahl, Daniel Huber
(Submitted on 27 Feb 2018)

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 (CARMA) 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 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⊙, 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.

Comments:    24 pages, 7 figures (including appendices); submitted to ApJL; paper text, figures, data, and code at this https URL
Subjects:    Solar and Stellar Astrophysics (astro-ph.SR); Earth and Planetary Astrophysics (astro-ph.EP)
Cite as:    arXiv:1802.09812 [astro-ph.SR] (or arXiv:1802.09812v1 [astro-ph.SR] for this version)
Submission history
From: Will Farr
[v1] Tue, 27 Feb 2018 10:33:15 GMT (700kb,D)
https://arxiv.org/abs/1802.09812