Resolving period aliases for TESS monotransits recovered during the extended mission

Abstract

We set out to explore how best to mitigate the number of period aliases for a transiting TESS system with two identified transits separated by a large time period on the order of years. We simulate a realistic population of doubly transiting planets based on the observing strategy of the TESS primary and extended missions. We next simulate additional observations using photometry (NGTS) and spectroscopy (HARPS and CORALIE) and assess its impact on the period aliases of systems with two TESS transits. We find that TESS will detect around 400 exoplanets that exhibit one transit in each of the primary and extended missions. Based on the temporal coverage, each of these systems will have an average of 38 period aliases. We find that, assuming a combination of NGTS and CORALIE over observing campaigns spanning 50 days, we can find the true alias, and thus solve the period, for up to 207 of these systems with even more being solved if the observing campaigns are extended or we upgrade to HARPS over CORALIE.

11 pages, 8 figures. Accepted for publication in MNRAS

References in corpus (11)

• The Transiting Exoplanet Survey Satellite
• The K2 Mission: Characterization and Early results
• Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e
• Simultaneous TESS and NGTS Transit Observations of WASP-166b
• TOI-222: a single-transit TESS candidate revealed to be a 34-day eclipsing binary with CORALIE, EulerCam and NGTS
• NGTS-11 b / TOI-1847 b: A transiting warm Saturn recovered from a TESS single-transit event
• A search for transiting planets around FGKM dwarfs and sub-giants in the TESS Full Frame Images of the Southern ecliptic hemisphere
• A New Yield Simulator for Transiting Planets and False Positives: Application to the Next Generation Transit Survey
• An examination of the effect of the TESS extended mission on southern hemisphere monotransits
• Constraining Orbital Periods from Nonconsecutive Observations: Period Estimates for Long-Period Planets in Six Systems Observed by K2 During Multiple Campaigns
• SpecPhot: A Comparison of Spectroscopic and Photometric Exoplanet Follow-Up Methods

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• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey: III. Recovery and Confirmation of a Temperate, Mildly Eccentric, Single-Transit Jupiter Orbiting TOI-2010
• Refined parameters of the HD 22946 planetary system and the true orbital period of planet d
• TESS and CHEOPS Discover Two Warm Sub-Neptunes Transiting the Bright K-dwarf HD 15906
• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. VI: Confirmation of a Long-Period Giant Planet Discovered with a Single TESS Transit
• Validating the Orbital Periods of the Coolest TESS Exoplanet Candidates