Title: A HOT SATURN ORBITING AN OSCILLATING LATE SUBGIANT DISCOVERED BY TESS
Authors: Daniel Huber, William J Chaplin et alFirst Author’s Institution: Institute for Astronomy, University of Hawai‘i, USAStatus: Submitted to AAS journals, closed access NASA’s space mission TESS is currently hunting for new exoplanets in the southern hemisphere sky. But while its primary aim is to find 50 small planets (with radii less than 4 Earth radii) with measurable mass, there is a lot of other interesting science to do. Today’s paper presents the discovery of a new exoplanet that is quite precisely characterised thanks to the complementary technique of asteroseismology used on the same data.
Meet TESSTESS will survey stars over the entire sky, studying 26 strips for 27 days each. Data for selected bright stars is downloaded to give data points every 2 minutes (a 2 minute cadence) then processed through a pipeline to produce lightcurves. Another pipeline detects transit-like signals in these lightcurves and identified TOI-197.01 as a planet candidate (see Figure 1a).
Is it an exoplanet?The authors used high resolution imaging by the NIRC2 camera on the Keck telescope to rule out companion stars that could produce a similar lightcurve. An intense spectral monitoring ...