An Estimate of the Yield of Single-transit Planetary Events from the Transiting Exoplanet Survey Satellite
Abstract
We present a semianalytic estimate of the expected yield of single-transit planets from the Transiting Exoplanet Survey Satellite (TESS). We use the TESS Candidate Target List-6 (CTL-6) as an input catalog of over four million sources. We predict that from the 200,000 stars selected to be observed with the high-cadence postage stamps (PSs) with the highest CTL-6 priority, there will be 241 single-transit events caused by planets detectable at a signal-to-noise ratio of S/N ≥ 7.3. We find a lower limit of an additional 977 events caused by single-transit planets in the full frame images (FFIs); this is a lower limit because the CTL-6 is incomplete below a TESS magnitude of T> 12. Of the single-transit events from the PSs and FFIs, 1091/1218 will have transit depths deeper than 0.1% and will thus be amenable for photometric follow-up from the ground, and 1195/1218 will have radial velocity signals greater than 1 m s-1. We estimate that the periods of 146 single transits will be constrained to better than 10% using the TESS photometry assuming circular orbits. We find that the number of planets detected by TESS in the PSs with periods P> 25 days can be doubled by including single-transiting planets, while the number of planets with P> 250 days can be increased by an order of magnitude. We predict 79 habitable zone planets in the TESS light curves from single transits, with 18 orbiting FGK stars.
- Publication:
-
The Astronomical Journal
- Pub Date:
- February 2019
- DOI:
- 10.3847/1538-3881/aaf85e
- arXiv:
- arXiv:1805.00956
- Bibcode:
- 2019AJ....157...84V
- Keywords:
-
- catalogs;
- planetary systems;
- surveys;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- 12 pages, 8 figures