Ondr}ejov echelle spectrograph, ground based support facility for exoplanet missions

Abstract

Fulfilling the goals of space-based exoplanetary transit surveys, like Kepler and TESS, is impossible without ground-based spectroscopic follow-up. In particular, the first-step vetting of candidates could easily necessitate several hundreds of hours of telescope time -- an area where 2-m class telescopes can play a crucial role. Here, we describe the results from the science verification of the Ondřejov Echelle Spectrograph (OES) installed on the 2-m Perek telescope. We discuss the performance of the instrument as well as its suitability for the study of exoplanetary candidates from space-based transit surveys. In spite of being located at an average European observing site, and originally being conceived for the study of variable stars, OES can prove to be an important instrument for the exoplanetary community in the TESS and PLATO era -- reaching accuracies of a few tens of m/s with reasonable sampling and signal-to-noise for sources down to V$\sim$13. The stability of OES is demonstrated via long-term monitoring of the standard star HD~109358, while its validity for exoplanetary candidate verification is shown using three K2 candidates EPIC~210925707, EPIC~206135267 and EPIC~211993818, to reveal that they are false positive detections.

accepted for publication in PASP

References in corpus (18)

• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• Modern stellar spectroscopy caveats
• A new list of thorium and argon spectral lines in the visible
• 197 Candidates and 104 Validated Planets in K2's First Five Fields
• SOPHIE velocimetry of Kepler transit candidates VII. A false-positive rate of 35% for Kepler close-in giant exoplanet candidates
• High-resolution imaging of $Kepler$ planet host candidates. A comprehensive comparison of different techniques
• Confirmation of the Planet Hypothesis for the Long-period Radial Velocity Variations of Beta Geminorum
• New planetary and EB candidates from Campaigns 1-6 of the K2 mission
• Discovery of a planet around the K giant star 4 UMa
• Transiting exoplanets from the CoRoT space mission XIV. CoRoT-11b: a transiting massive "hot-Jupiter" in a prograde orbit around a rapidly rotating F-type star
• Adaptive Optics Images III: 87 Kepler Objects of Interest
• Disproval of the validated planets K2-78b, K2-82b, and K2-92b
• Three statistically validated K2 transiting warm Jupiter exoplanets confirmed as low-mass stars
• Doppler search for exoplanet candidates and binaries in a CoRoT field using a multi-fiber spectrograph
• HD 99458: First time ever Ap-type star as a $\delta$ Scuti pulsator in a short period eclipsing binary?
• Stellar classification of CoRoT targets
• Detection limits of exoplanetary atmospheres with 2-m class telescopes
• Transit timing variations, radial velocities and long-term dynamical stability of the system Kepler-410