Rotation periods of TESS Objects of Interest from the Magellan-TESS Survey with multiband photometry from Evryscope and TESS

Howard, Ward S.; Teske, Johanna; Corbett, Hank; Law, Nicholas M.; Wang, Sharon Xuesong; Ratzloff, Jeffrey K.; Galliher, Nathan W.; Gonzalez, Ramses; Soto, Alan Vasquez; Glazier, Amy L.; Haislip, Joshua

doi:10.48550/arxiv.2106.15638

Cited by 1 publication

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References 53 publications

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“…The TOI catalog has been well utilized for exoplanet research, including TTV analysis which uses the data in a similar condition to this work (Pearson 2019;Martins et al 2020;Howard et al 2021).…”

Section: Tess Photometry and Toi Catalogmentioning

confidence: 99%

TESS Timings of 31 Hot Jupiters with Ephemeris Uncertainties

Shan¹,

Yang²,

Lu³

et al. 2021

Preprint

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A precise transit ephemeris serves as the premise for follow-up exoplanet observations. The transit timing variation (TTV) as an important scientific output potentially reveals planetary orbital evolution. We compare transit timings of 262 hot Jupiters from TESS with the archival ephemeris and find 31 of them having significant TESS timing offsets, among which WASP-161b shows the most significant offset of -203.7±4.1 minutes. The median value of these offsets is 17.8 minutes, equivalent to 3.4 σ. We evaluate the timing precision of TESS Objects of Interest (TOI) which provides the TESS timings in this work. The evaluation is applied by deriving TESS transit timing from a self-generated pipeline. We refine and update the previous ephemeris, based on precise timing (uncertainty within 1 minute) and a long timing baseline (∼ 10 years). Our refined ephemeris gives the transit timing at a median precision of 1.11 minutes until 2025 and 1.86 minutes until 2030. All the targets with timing offset larger than 10σ present earlier timings than the prediction, which cannot be due to underestimated ephemeris uncertainty, apsidal precision, or Rømer effect as those effects should be unsigned. We regard the timing offsets mainly originating from the underestimated ephemeris uncertainty. For some particular targets, timing offsets are due to tidal dissipation. We find a tentative TTV of XO-3b (timing offset > 10 σ) yielding a period derivative of 5.8±0.9×10 −9 . The TTV may be explained by tidal dissipation. Our result provides direct observational support for the tidal dissipation of XO-3b, reported in previous work.

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Section: Tess Photometry and Toi Catalogmentioning

confidence: 99%