Bibcode
Hon, M.; Stello, Dennis; García, Rafael A.; Mathur, S.; Sharma, Sanjib; Colman, Isabel L.; Bugnet, Lisa
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 4, p.5616-5630
Advertised on:
6
2019
Citations
28
Refereed citations
28
Description
The recently published Kepler mission Data Release 25 (DR25) reported on
˜197 000 targets observed during the mission. Despite this, no
wide search for red giants showing solar-like oscillations have been
made across all stars observed in Kepler's long-cadence mode. In this
work, we perform this task using custom apertures on the Kepler pixel
files and detect oscillations in 21 914 stars, representing the largest
sample of solar-like oscillating stars to date. We measure their
frequency at maximum power, νmax, down to ν _{max}
≃ 4 μHz and obtain log (g) estimates with a typical uncertainty
below 0.05 dex, which is superior to typical measurements from
spectroscopy. Additionally, the νmax distribution of our
detections show good agreement with results from a simulated model of
the Milky Way, with a ratio of observed to predicted stars of 0.992 for
stars with 10 <ν _{max}< 270 μHz. Among our red giant
detections, we find 909 to be dwarf/subgiant stars whose flux signal is
polluted by a neighbouring giant as a result of using larger photometric
apertures than those used by the NASA Kepler science processing
pipeline. We further find that only 293 of the polluting giants are
known Kepler targets. The remainder comprises over 600 newly identified
oscillating red giants, with many expected to belong to the Galactic
halo, serendipitously falling within the Kepler pixel files of targeted
stars.
Related projects
Helio and Astero-Seismology and Exoplanets Search
The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary
Savita
Mathur