Abstract
Kepler asteroseismology has played an important role in the characterization of host stars and their planetary systems. Target selection biases, however, meant that this synergy would remain mostly confined to main-sequence stars. The advent of TESS has since lifted this restriction, enabling the systematic search for transiting planets around seismic giants, as well as revisiting previously known evolved hosts using asteroseismology. Here, we present the detailed asteroseismic modeling of two high-luminosity red-giant branch hosts, KOI-3886 and iota Draconis. KOI-3886, observed by Kepler over 4 years and later by TESS over 1 sector, has been a longtime candidate host. iota Draconis, observed by TESS over 5 sectors, is known to host a planet in a highly eccentric orbit. The precise (~ 6%) seismic mass derived for iota Draconis was combined with new radial-velocity observations to detect an additional long-period companion. Regarding KOI-3886, asteroseismology was key in helping reveal the planet candidate as a false positive and reinterpreting the system as an eclipsing brown dwarf in a hierarchical triple with two evolved stars. This brings to light the importance of asteroseismology in the study of planetary orbital dynamics off the main sequence and its lesser known role in candidate vetting
Original language | English |
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Title of host publication | TESS Science Conference 2 |
Subtitle of host publication | Posters from the TESS Science Conference II (TSC2), held virtually Aug 2 - 6 2021 |
Publisher | Zenodo |
Number of pages | 1 |
DOIs | |
Publication status | Published - 23 Jul 2021 |
Event | TESS Science Conference II - Virtual Duration: 2 Aug 2021 → 6 Aug 2021 |
Conference
Conference | TESS Science Conference II |
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Abbreviated title | TSC2 |
Period | 2/08/21 → 6/08/21 |
Keywords
- Stellar Astrophysics
- Exoplanets